CN1407816A - Self-adapting method for mobile communication transmitting signals - Google Patents

Self-adapting method for mobile communication transmitting signals Download PDF

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Publication number
CN1407816A
CN1407816A CN 01142008 CN01142008A CN1407816A CN 1407816 A CN1407816 A CN 1407816A CN 01142008 CN01142008 CN 01142008 CN 01142008 A CN01142008 A CN 01142008A CN 1407816 A CN1407816 A CN 1407816A
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sir
base station
interference ratio
value
signal interference
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CN 01142008
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CN1192647C (en
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胡灏
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Abstract

The self adaptable regulating method for mobile communication transfer signals of time division duplex system is carried out by a) measuring SIRdown by mobile station and transferring its value to the correspondant base station, receiving it by the base station and measuring the SIRup, b) comparing the both SIR by the base station to make weighted adding their values if their difference is less than a threshold and to oblain the processed, SIRest, c) giving a reply ACK or NACK to the base station according to the CRC of the received data blocks by the mobile station, and d) regulating modified level or transmitting power according to the result of comparison between the SIRest and its reference and the said received reply signals, then return to the step a.

Description

A kind of self-adapting regulation method of mobile communication signals
Technical field
The present invention relates to the mobile communication signals adjustment technology, refer to that especially a kind of combining with adaptive modulation encoding technology and power control techniques carry out the method that self adaptation is adjusted to mobile communication signals jointly.
Background of invention
In the signals transmission of mobile communication, because have that user-user signal disturbs, transmission channel conditions changes frequent, base station and travelling carriage between the constantly strong and weak factor that changes or the like of signal, make the signal transmission quality instability, therefore, must be in real time the power of transmitt or receive signal, coded system or the like parameter be adjusted accordingly, what just can ensure signal quality is reliable and stable.
At present, the most common signal method of adjustment has: the rank to modulation code level number (MCS) is adjusted; Or utilize power control techniques that transmitted power is adjusted.
In the enhancement techniques of 3-G (Generation Three mobile communication system), the method of a kind of adaptively changing Modulation and Coding Scheme (AMC) has been proposed, this method is that the rank with modulating-coding is divided into eight grades, as shown in Table 1, when channel condition changes, the rank of modulating-coding progression (MCS) also will be adjusted up or down automatically according to the quality of channel condition, and will be good with the transmission performance that guarantees signal.Table one has provided eight grades of alternative Modulation and Coding Scheme:
Code level Modulation scheme Encoding scheme (information bit/total bit)
??????1 Quaternary PSK (QPSK) ????1/4
??????2 Quaternary PSK (QPSK) ????1/2
??????3 Quaternary PSK (QPSK) ????3/4
??????4 8 phase shift keyings (8PSK) ????3/4
??????5 16 rank quadrature amplitude modulation (16QAM) ????1/2
???6 16 rank quadrature amplitude modulation (16QAM) ????3/4
???7 64 rank quadrature amplitude modulation (64QAM) ????1/2
???8 64 rank quadrature amplitude modulation (64QAM) ????3/4
Table one Modulation and Coding Scheme
Numeral in table one encoding scheme " 1/4 " is to represent to transmit altogether 4 bits, and wherein 1 bit is an information bit, and all the other 3 bits are redundant bit; In like manner, 2 bits are transmitted in " 1/2 " expression altogether, and 1 bit is an information bit, and 1 bit is a redundant bit; Other all by that analogy.
It is another kind of that signal adjusting method--transmission power control (TPC) is one of key technology in the mobile communication.In up link, if keep in the same sub-district all transmission power of mobile station identical, because distance is different between base station and the travelling carriage, the power that travelling carriage receives signal is also different, can produce to suppress weak phenomenon, be called " near-far interference ", the main purpose of this power control techniques is exactly in order to overcome the near-far interference of signal, in actual transmissions, the adjustment by the transmitting power size guarantees that available signal power that the far and near different travelling carriage of distance is received equates or the signal interference ratio of signal equates.In fact, this technology also is a kind of adaptation scheme to channel variation, and it is consistent with the function that the AMC technology is realized, just the approach difference that adopts.But, when above-mentioned two kinds of adaptation schemes use separately, can only singly be adjusted transmission signals from signal power or coded system angle, can not consider to influence the various factors of signal transmission comprehensively, make signal not reach best transmission state.
So, also have in the prior art Adaptive Modulation and Coding (AMC) and transmission power control (TPC) technology are used in combination, it is with the adjustment foundation of SIR as AMC, specifically be exactly: the sir value of actual measurement is judged the quality of current channel condition or speech quality when transmitting according to signal, and then adjust the rank of coding automatically by AMC, but this method is not adjusted power.And, adopt this method to have following problem: because the channel conditions more complicated, therefore,, to cause systematic function decline than the mistake adjustment that is easier to cause AMC merely with not accurate enough as measuring amount of the sir measurement value of up or down channel own.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of self-adapting regulation method of mobile communication signals, it can accurately adjusted coding behind estimation channel the present situation, and then improve the accuracy of coding adjustment and the overall performance of system.
For achieving the above object, technical scheme of the present invention specifically is achieved in that
A kind of self-adapting regulation method of mobile communication signals is applicable to time division duplex (TDD) system, and this method comprises the steps: at least
A. the signal interference ratio value SIR of moving table measuring down channel Down, and pass through the message signaling with SIR DownValue sends to its corresponding base station, the SIR that the base station receiving mobile is sent DownBe worth, measure the signal interference ratio value SIR of up channel simultaneously On
B. SIR is compared in the base station DownAnd SIR OnIf, SIR DownWith SIR OnDifference less than the thresholding difference, then the base station is to SIR DownWith SIR OnValue computes weighted, the received signal signal interference ratio value SIR after obtaining handling Est, wherein, this thresholding difference is predefined, scope is between 3dB～5dB;
C. travelling carriage carries out Cyclic Redundancy Check to received data block, if transmission is correct, then travelling carriage returns success response message ACK to the base station, otherwise, return failure response message NACK;
D. the base station is according to SIR EstWith benchmark signal interference ratio reference value SIR TarComparative result and the response result received modulation code level or transmitting power are adjusted, return step a.
This method further comprises: calculate benchmark signal interference ratio reference value SIR in advance Tar, this value is calculated resulting CRC check result by radio network controller (RNC) to its each base station of administering and is carried out grand diversity and merge and draw.
Wherein, steps d further comprises:
D1. work as SIR Est＞SIR TarAnd when receiving ACK, the modulating-coding rank remains unchanged, and reduces transmitting power;
D2. work as SIR Est＞SIR TarAnd when receiving NACK, the modulating-coding rank reduces one-level, and transmitting power is constant;
D3. work as SIR Est＜SIR TarAnd when receiving ACK, modulating-coding rank rising one-level, transmitting power is constant;
D4. work as SIR Est＜SIR TarAnd when receiving NACK, the modulating-coding rank remains unchanged, and improves transmitting power;
D5. when not receiving ACK or NACK, modulating-coding rank and transmitting power all remain unchanged.
This method also further comprises: if SIR DownWith SIR OnDifference more than or equal to the thresholding difference, then adopt the fast fading channel processing method to adjust code level or transmitting power.This fast fading channel processing method is transmission power control (TPC) method, perhaps is Adaptive Modulation and Coding (AMC) and transmission power control (TPC) combined techniques.Described AMC and TPC combined techniques are adjusted code level according to the Adaptive Modulation and Coding scheme after being meant that system determines current channel condition according to the actual measured value of signal interference ratio SIR.
Ranking operation among the step b is meant received signal signal interference ratio value SIR EstEqual SIR DownWith SIR OnBe multiplied by respectively behind weighted factor, the β and, this weighted factor and β sum are 1.
By such scheme as can be seen, key of the present invention is: the comparative result that utilizes weighting merging value and the benchmark signal interference ratio reference value of two signal interference ratio SIR of uplink and downlink channel measurement gained, in conjunction with the result of travelling carriage, determine whether changing and how changing modulating-coding rank and transmitting power jointly to received data piece CRC check.
Though the situation of change complexity of wireless channel conditions, be difficult to guarantee the accuracy of channel measurement, but in the TDD system, because the uplink and downlink channel is on the same frequency range, the uplink and downlink link has correlation, therefore can reach the accuracy that raising is estimated channel conditions by considering the uplink and downlink channel estimation value simultaneously.
The present invention has made full use of the correlation of TDD system uplink downlink just, to up channel SIR OnValue and down channel SIR DownValue is measured respectively, and differentiates channel conditions according to measurement result, makes corresponding adjustment.Can adjust after accurately estimating channel conditions by this method, so, the power division in the Adjustment System guarantees the reliability that coding is adjusted better, and then guarantees signal transmission quality, improves the capacity and the performance of system again.
Description of drawings
The flow chart that Fig. 1 realizes for the inventive method.
Embodiment
The present invention is further described in more detail below in conjunction with drawings and the specific embodiments.
Suppose that this wireless communication system adopts many Modulation and Coding Scheme, and have the function of CRC check and feedback result information.Preestablish following parameter simultaneously:
1) SIR DownThe signal interference ratio of the down channel of estimating for mobile station side;
2) SIR OnThe signal interference ratio of the up channel of estimating for base station side;
3) SIR EstThe signal interference ratio of the received signal that forms for the base station side weighting;
4) SIR TarBe the target signal interference ratio that base station node B end external circule power control forms, this value is calculated in advance by radio network controller (RNC), is about to RNC and resulting CRC check result is calculated in its each base station of administering carries out grand diversity merging and draw.Because it is very slow that this value changes, and can be used as benchmark signal interference ratio reference value.Wherein, outer shroud is meant the loop between base station and the mobile switching centre;
5) whether successful ACK/NACK be subscriber equipment (UE) end feedback data bag transmission sign after CRC check, and ACK represents success, and NACK represents to fail.
Referring to shown in Figure 1, the specific implementation process of the inventive method comprises the steps: at least
(1) moving table measuring is to the signal interference ratio value SIR of down channel Down=a, travelling carriage pass through the message signaling with SIR DownValue a sends to the base station.
(2) base station receives the SIR that travelling carriage sends DownBe worth a, measure the signal interference ratio value SIR of up channel simultaneously On=b.
(3) base station compares two value a and the b that obtains, and handles if the difference of a and b, then enters step (4) greater than the thresholding difference; Handle otherwise enter step (5), wherein, the thresholding difference of up-downgoing signal interference ratio is predefined, and this value scope is about 3～5dB.The setting of this thresholding difference size is the actual conditions of relative current transmission channel signal interference ratio, and when the 20dB left and right sides, then the thresholding difference is made as 3dB such as: signal interference ratio value.
(4) if differing by more than, two values equal threshold value, promptly | and SIR On-SIR Down| 〉=thresholding difference, illustrate that channel is in the rapid fading state, can take dual mode that transmission signals is adjusted: to adopt TPC separately; Or be used in combination AMC and TPC, promptly judge the quality of current channel condition or speech quality, and then adjust code level by AMC with the sir value of actual measurement.
(5), illustrate that channel situation is better, decline is slow, then the SIR of base station to receiving if two values differ less DownAnd SIR OnBe weighted to handle and obtain SIR Est, be shown below:
SIR Est=SIR Down* α+SIR On* β wherein, α and β are that weighted factor and α, β sum are 1, in actual applications, the value of α and β is approaching more good more, in the present embodiment, the value of α and β all is chosen to be 0.5, then:
SIR Est=a * 0.5+b * 0.5SIR EstAfter calculating, the base station is adjusted modulating-coding according to the following rules:
A) SIR Est＞SIR TarAnd when receiving ACK, the MCS rank remains unchanged, and transmitting power reduces 1dB;
B) SIR Est＞SIR TarAnd when receiving NACK, the MCS rank reduces one-level, and transmitting power is constant;
C) SIR Est＜SIR TarAnd when receiving ACK, MCS rank rising one-level, transmitting power is constant;
D) SIR Est＜SIR TarAnd when receiving NACK, the MCS rank remains unchanged, and transmitting power improves 1dB;
E) when not receiving ACK or NACK, MCS rank and transmitting power all remain unchanged.
In above-mentioned regulation rule, for a situation, SIR Est＞SIR TarAnd receive that ACK explanation transmitting power is bigger, but channel condition is better, can suitably reduce transmitted power this moment; The b situation receives that NACK explanation channel condition is not fine, and can not reduce transmitting power this moment; C situation explanation channel condition is better, therefore can keep transmitting power constant simultaneously MCS rank rising one-level; The d situation illustrates that then channel condition is bad, improves transmitting power and gets final product.
(6) come back to the new processing procedure of step (1) beginning.
The present invention is by utilizing TDD system uplink and downlink correlation between channels, two sir values that adopt travelling carriage and base station measurement to obtain are respectively judged channel conditions, and according to the weighted value of two sir measurement values as criterion, result in conjunction with CRC check determines whether changing MCS and power simultaneously, thereby can reflect channel conditions more accurately, and make and adjust decision more accurately, finally reach more effective control system power, improve the purpose of power system capacity and performance.

Claims (10)

1, a kind of self-adapting regulation method of mobile communication signals is applicable to time division duplex (TDD) system, it is characterized in that this method comprises the steps: at least
A. the signal interference ratio value SIR of moving table measuring down channel Down, and pass through the message signaling with SIR DownValue sends to its corresponding base station, the SIR that the base station receiving mobile is sent DownBe worth, measure the signal interference ratio value SIR of up channel simultaneously On
B. SIR is compared in the base station DownAnd SIR OnIf, SIR DownWith SIR OnDifference less than the thresholding difference, then the base station is to SIR DownWith SIR OnValue computes weighted, the received signal signal interference ratio value SIR after obtaining handling Est
C. travelling carriage carries out Cyclic Redundancy Check to received data block, if transmission is correct, then travelling carriage returns success response message ACK to the base station, otherwise, return failure response message NACK;
D. the base station is according to SIR EstWith benchmark signal interference ratio reference value SIR TarComparative result and the response result received modulation code level or transmitting power are adjusted, return step a.
2, method according to claim 1 is characterized in that this method further comprises: calculate benchmark signal interference ratio reference value SIR in advance Tar, this value is calculated resulting CRC check result by radio network controller (RNC) to its each base station of administering and is carried out grand diversity and merge and draw.
3, method according to claim 1 and 2 is characterized in that steps d further comprises:
D1. work as SIR Est＞SIR TarAnd when receiving ACK, the modulating-coding rank remains unchanged, and reduces transmitting power;
D2. work as SIR Est＞SIR TarAnd when receiving NACK, the modulating-coding rank reduces one-level, and transmitting power is constant;
D3. work as SIR Est＜SIR TarAnd when receiving ACK, modulating-coding rank rising one-level, transmitting power is constant;
D4. work as SIR Est＜SIR TarAnd when receiving NACK, the modulating-coding rank remains unchanged, and improves transmitting power;
D5. when not receiving ACK or NACK, modulating-coding rank and transmitting power all remain unchanged.
4, method according to claim 1 is characterized in that this method further comprises:
If SIR DownWith SIR OnDifference more than or equal to the thresholding difference, then adopt the fast fading channel processing method to adjust code level or transmitting power.
5, method according to claim 4 is characterized in that: described fast fading channel processing method is transmission power control (TPC) method, perhaps is Adaptive Modulation and Coding (AMC) and transmission power control (TPC) combined techniques.
6, method according to claim 5 is characterized in that: described AMC and TPC combined techniques are adjusted code level according to the Adaptive Modulation and Coding scheme after being meant that system determines current channel condition according to the actual measured value of signal interference ratio SIR.
7, method according to claim 1 is characterized in that this method further comprises: the thresholding difference that preestablishes the up-downgoing signal interference ratio.
8, according to claim 1,4 or 7 described methods, it is characterized in that: the scope of described thresholding difference is 3dB～5dB.
9, method according to claim 1 is characterized in that: the ranking operation described in the step b is meant received signal signal interference ratio value SIR EstEqual SIR DownWith SIR OnBe multiplied by respectively behind weighted factor, the β and.
10, method according to claim 9 is characterized in that: described weighted factor and β sum are 1.
CN 01142008 2001-09-06 2001-09-06 Self-adapting method for mobile communication transmitting signals Expired - Fee Related CN1192647C (en)

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