CN101163315B - Method for constructing asymmetric channel - Google Patents
Method for constructing asymmetric channel Download PDFInfo
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- CN101163315B CN101163315B CN2007101247143A CN200710124714A CN101163315B CN 101163315 B CN101163315 B CN 101163315B CN 2007101247143 A CN2007101247143 A CN 2007101247143A CN 200710124714 A CN200710124714 A CN 200710124714A CN 101163315 B CN101163315 B CN 101163315B
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Abstract
The invention discloses a method of constructing an asymmetric channel and is applied to the wireless communication system field. The method comprises the following steps: the type of the asymmetric channel to be constructed is ascertained; channel parameters are selected as the parameters for the asymmetric channel to be constructed; initial values are preset for the selected channel parameters; the constructed asymmetric channel is verified. The invention adopts the proposal to constructs an asymmetric uplink and a downlink channel based on the symmetric channels by adjusting the relevant parameters of the channels, so the reverse channel interference between the uplink channel and the downlink channel is eliminated, the independent research and testing of the uplink channel and the downlink channel are realized conveniently, the research is conducted in a deeper and more careful way, the testing becomes adequate and complete, and the result is accurate and reliable.
Description
Technical field
The present invention relates to wireless communication technology field, relate in particular to a kind of method of constructing nonsymmetric channel.
Background technology
The signal of wireless communication system can be subjected to the interference of numerous noises and other signals in wireless environment is propagated, and code book has multipath effect under wireless environment, variation along with environment, the perhaps transmitting terminal of signal or receiving terminal, for example mobile phone terminal moves, also can cause the fast slow fading variation of signal and Doppler frequency shift etc., these make troubles all for the receiving demodulation of signal.By correlation techniques such as channel estimating, can address these problems effectively at wireless environment.The characteristic of research wireless environment, and in the modulate emission of signal, transmission, receiving demodulation, be used, the performance that improves wireless communication system is had important function.
Wireless communication system is at the network planning initial stage, available special instrument is tested and is proofreaied and correct radio transmission model, usually this is at descending radio transmission model, it is signal is transmitted into the terminal antenna mouth from the antenna for base station mouth wireless channel, and up radio transmission model, it is signal is transmitted into the antenna for base station mouth from the terminal antenna mouth wireless channel, generally speaking be of equal value with descending wireless channel, terminal adopts omnidirectional antenna but if smart antenna is adopted in the base station of system, the up-downgoing wireless channel is difference to some extent, TD-SCDMA (Time Division-Synchronous Code DivisionMultipie Access for example, Time Division-Synchronous Code Division Multiple Access inserts) system, if the noise of up-downgoing wireless channel and interference are different, difference will be bigger just, and the TD-SCDMA system also has this phenomenon to exist.In addition, what influence communication performance in the real network is not only wireless channel, has also comprised the send channel of transmitting terminal from the modulating part to the antenna opening, and the receive channel of receiving terminal from the antenna opening to the demodulation part.With reference to the accompanying drawings 1, transmitting terminal is sent the bit of encoder output into send channel and is modulated, be transmitted in the wireless channel by antenna then, the signal that receiving terminal is received antenna is sent into receive channel and is carried out demodulation, then the bit of demodulation output is delivered to decoder, send channel, wireless channel and receive channel, the three here constructs and defines and becomes a generalized channel, this generalized channel both can have been represented the down channel from transmission end of base station to the terminal receiving terminal, also can represent the up channel from the terminal transmitting terminal to the base station receiving terminal.If the channel of wireless communication system is carried out fully complete research, just need test, and should test respectively, and just downlink wireless channel not tested up channel and down channel to generalized channel based on real system.
The uplink and downlink communication link of wireless communication system generally all is based on certain principle and is designed to balance, and promptly generalized channel is designed to symmetry.The design of this symmetric channel can make the ability of base station in the system and terminal coordinate, and all reaches peak use rate, but this design make troubles also can for sometimes systematic research and test.For example, when needs are studied the characteristic of up-downgoing channel respectively, because the characteristics of channel symmetry, the deterioration situation of down channel will have influence on the test of up channel, and the deterioration situation of up channel also will have influence on the test of down channel, so just is unfavorable for studying accurately and fully the characteristic of generalized channel.Moreover, be designed to up limited or descending limited wireless communication system for some, also can have influence on test because up elder generation is limited, or have influence on test up channel because descending elder generation is limited to down channel.
TD-SCDMA is as one of 3G (Third Generation) Moblie three big standards, smart antenna is adopted in the base station, by estimating DOA (the Direction OfArrival of upward signal, direction of arrival) determines downstream signal BF (Beam forming, wave beam forming) transmit direction, if limited situation appears in up channel, be that upward signal worsens, then the base station is estimated deviation to occur to the DOA of upward signal, have influence on the accuracy of descending BF, so will have influence on to down channel with BF accurately, study fully and test.In addition, owing to adopted the mechanism of closed-loop control, for example power control, Synchronization Control etc., the up-downgoing channel of TD-SCDMA has the function of mutual control, when down channel occurring when limited, decoding error will appear in the control information that downstream signal carries, and has influence on the power adjustment of upward signal and adjusts synchronously, even may cause the deterioration of upward signal, the chain reaction that up-downgoing alternately worsens appears.How effectively to eliminate the backward channel interference effect of up-downgoing interchannel to a certain extent, will create precondition the independent studies and the test of TD-SCDMA system up-downgoing channel.
Therefore, prior art awaits improving and development.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of method of constructing nonsymmetric channel, this method is on the basis of existing symmetric channel, by regulating channel related parameter, construct a kind of asymmetrical up-downgoing channel, be convenient to realize the independent studies and the test of up-downgoing channel.
In order to solve the problems of the technologies described above, the inventive method adopts following technical scheme:
A, determine nonsymmetric channel and the earlier limited nonsymmetric channel of down channel that the required type of nonsymmetric channel of required structure, described nonsymmetric channel type comprise that up channel is earlier limited;
B, selective channel parameter are as the parameter of constructing described nonsymmetric channel;
C, to the default initial value of selected channel parameter;
D, verify described nonsymmetric channel;
After E, checking are passed through, research and the test that can be correlated with based on described nonsymmetric channel.
Described method, wherein, described channel parameter comprises spreading gain, power gain, smart antenna gain and noise power.
Described method, wherein, constructing the required channel parameter of described nonsymmetric channel is the combination of the one or more channel parameters in the described channel parameter.
Described method, wherein, step C comprises: by increasing the value of described channel parameter, default different channel parameter initial value.
Described method, wherein, step C comprises: by reducing the value of described channel parameter, default different channel parameter initial value.
Described method, wherein, among the step D, described validation criteria adopts the degradation criterion of the uplink and downlink signals in the communication protocol.
Described method, wherein, when constructing the earlier limited nonsymmetric channel of up channel, validation criteria is exactly when signal limitation occurring, the Block Error Rate of upward signal continues T and surpasses deterioration value E second, and the Block Error Rate of downstream signal remains zero substantially, and wherein T is relevant with signal corresponding service type with E.
Described method wherein, in the step e, if checking do not pass through, continues the value of described selected channel parameter is adjusted, or selects other channel parameter to carry out relative set.
Adopt such scheme, the present invention is by passing through to regulate channel related parameter on the basis of symmetric channel, construct a kind of asymmetrical up-downgoing channel, thereby eliminated the backward channel interference effect of up-downgoing interchannel, be convenient to realize the independent studies and the test of up-downgoing channel, make that research is thoroughgoing and painstaking more, test is more fully complete, the result more accurately and reliably.
Description of drawings
Fig. 1 is the generalized channel structural representation of prior art wireless communication system;
Fig. 2 is the realization flow of the inventive method.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment of the present invention is described in further detail.
Design principle of the present invention: on the basis of symmetric channel, by regulating channel related parameter, construct a kind of asymmetrical up-downgoing channel, make and on the nonsymmetric channel basis of being constructed, can carry out relatively independent research and test to the up-downgoing channel respectively.For example, construct a limited nonsymmetric channel of up elder generation and study up channel, with regard to not having influence on the independent studies of up channel because descending elder generation is limited and having tested, in like manner, construct a limited nonsymmetric channel of descending elder generation and study down channel like this.
Be example with the TD-SCDMA system below, introduce the implementation procedure of the inventive method in detail.
The parameter that influences the up-downgoing generalized channel in the TD-SCDMA system comprises the parameter of the parameter of send channel, receive channel and the parameter of wireless channel, particularly, the power of frequency, time slot, sub-district code character parameter, code channel, power gain, smart antenna pattern, noise and the interference signal of uplink and downlink signals is arranged, and comprise wireless propagation model parameter of antenna height etc. etc.Wherein, code character parameter in sub-district comprises scrambler, Midamble sign indicating number (training sequence), up-downgoing synchronous code; Code channel is exactly spread spectrum (Spreading Frequency, be abbreviated as SF) sign indicating number, the spreading gain that the spreading code of different spreading factors is corresponding different, for example relative spreading factor is 1 spreading code (code word that does not promptly have the spread spectrum effect), spreading factor is that the spreading gain that the spreading code of N brings is 10*Log
10N (unit is dB); The power gain that the transmitting terminal that power gain refers to the base station here gives upward signal at receive channel for the receiving terminal of the power gain of downstream signal and base station at send channel, it has comprised the gain to baseband signal, the gain of intermediate-freuqncy signal and the gain of radiofrequency signal; The smart antenna pattern refers to the smart antenna (SmartAntenna of base station here, be abbreviated as SA) use what antenna channels to launch, use what antenna channels to receive, emission is to adopt wave beam forming emission or theaomni-directional transmission, reception is to adopt wave beam forming to receive or omnidirectional's reception, different use patterns are brought different gains, use port number many more, it is high more to gain, and use wave beam forming will increase a wave beam forming gain than omnidirectional, for example relative single antenna channels, the 10*Log that the gain that the theaomni-directional transmission of M antenna channels is brought is
10M (unit is dB), and the 20*Log that the gain that the emission of the wave beam forming of M antenna channels brings is
10M (unit is dB); Noise refers to base station place the be added to descending white Gaussian noise of transmitting terminal downstream signal and the up white Gaussian noise of the receiving terminal upward signal that is added to here.
The present invention selects part to be suitable for constructing the channel parameter of nonsymmetric channel, and is as shown in table 1;
The channel parameter table of table 1 structure nonsymmetric channel
| Channel parameter | Up value | Descending value | Remarks |
| Spreading gain | Gain SF，UL | Gain SF，DL | Up-downgoing can be used the spreading code of different spreading gains, |
| Power gain | Gain Power，UL | Gain Power，DL | Up-downgoing can be provided with corresponding power gain respectively |
| The smart antenna gain | Gain SA，UL | Gain SA，DL | Up-downgoing can be used different smart antenna patterns, |
[0033]
| Different mode brings different smart antenna gains | |||
| Noise power | Power Noise，UL | Power Noise，DL | Up-downgoing can add the noise of different capacity respectively |
Can effectively satisfy system research and test request in order to ensure the nonsymmetric channel of being constructed, must realize it by some rational flow processs and constraints.For this reason, the invention provides a kind of method of constructing nonsymmetric channel, see also accompanying drawing 2, it realizes that flow chart comprises the steps:
110, determining the nonsymmetric channel type of required structure at Research on Channel test contents and characteristics, for example, is earlier limited nonsymmetric channel of up channel or the earlier limited nonsymmetric channel of down channel;
120, select suitable channel parameter, as the parameter of structure nonsymmetric channel, it can be single parameter, also can be the combination of a plurality of parameters;
130,, the up-downgoing span of nonsymmetric channel is provided with suitable numerical value respectively according to selected channel parameter;
140, the nonsymmetric channel of being constructed is verified;
150, whether checking is passed through, if pass through, then goes to step 160, otherwise returns step 120, continues to select identical channel parameter to adjust, or selects other channel parameter to carry out relative set;
160, checking is passed through, research and the test that can be correlated with based on described nonsymmetric channel.
Wherein, for described step 120, when the structure nonsymmetric channel, based on shown in the table 1, can select single parameter or a plurality of parameter combinations adjustment to realize, such as, when the limited channel of certain direction of structure, can select this parameter of power gain to adjust, also can select these two parameters of power gain and noise power to adjust simultaneously.
Wherein, in the step 130, mainly be by increasing or reduce the value of the channel parameter of up-downgoing channel, on the basis of symmetric channel, constructing nonsymmetric channel.Such as, can select the power gain of signal to construct nonsymmetric channel, it is respectively Gain that the up and down power gain of symmetry channel is provided with
Power, ULAnd Gain
Power, DL,, can reduce Gain in original being provided with so if construct a nonsymmetric channel that up elder generation is limited
Power, UL, perhaps increase Gain
Power, DL
The present invention provide communication link expression formula below in order better to explain based on generalized channel
Power
RX＝Power
TX+Gain
TX-Pathloss
s+Gain
RX (1)
In the formula (1), Power
RXBe the power of receiving terminal receive channel output signal (be generally Eb/No, i.e. the ratio of the signal energy of every bit and noise power spectral density, unit is dB), Power
TXBe the power (correspondence also is Eb/No) of transmitting terminal send channel input signal, Gain
TXBe the gain of send channel, there is following formula in the place in the base station
Gain
TX＝Gain
SF，DL+Gain
Power，DL+Gain
SA，DL-Power
Noise，DL (2)
In the formula (2), Pathloss
sBe the path loss of wireless channel, Gain
RXBe the gain of receive channel, and have following formula at the place, base station
Gain
RX＝Gain
SF，UL+Gain
Power，UL+Gain
SA，UL-Power
Noise，UL (3)
The path loss that defines generalized channel again is as follows
Pathloss＝Pathloss
s-Gain
TX-Gain
RX (4)
Then by formula (1), (2), (3), (4) gained
Power
RX＝Power
TX-Pathloss (5)
So the influence of any generalized channel relevant parameter adjustment can be summed up in the point that in the variation of generalized channel path loss.
For example, reduce ascending power gain G ain in employing
Power, ULWhen constructing the limited nonsymmetric channel of up elder generation, if Gain
Power, ULReduce 6dB, the path loss Pathloss of so up generalized channel just is equivalent to increase 6dB, and the concrete adjusted value of other parameters also can of equal value convert the changing value of generalized channel path loss to.This is a prior art, does not repeat them here.
Wherein, for step 140, validation criteria can be verified the nonsymmetric channel that is constructed with reference to the degradation criterion of the uplink and downlink signals in the relevant communication protocol.For example, construct the earlier limited nonsymmetric channel of up channel, criterion is exactly when signal limitation occurring, the BLER of upward signal (Block Error Ratio, Block Error Rate) continues T and surpass deterioration value E second, and the BLER of downstream signal should still remain 0 substantially, and this nonsymmetric channel that constructs just can be thought to meet the demands so.The T here is relevant with signal corresponding service type with E, for example for (the Circuit Sevice of the CS in the TD-SCDMA system, circuit domain business) speech business of 12.2K, T and E can be set to 7 and 5%, for the visual telephone service of CS64K, T and E can be set to 7 and 3%, for PS (Packet Sevice, the data field business) business, T and E can be set to 7 and 10%.For the validation criteria that constructs the earlier limited nonsymmetric channel of down channel also is the same.
Wherein, in the described step 150, when employing reduces ascending power Gain
Power, ULWhen constructing the limited nonsymmetric channel of up elder generation, can reduce 6dB at the beginning and attempt, if checking can't pass, so can be at original ascending power Gain
Power, ULThe basis on reduce 3dB again, until finding one to satisfy the value that structure requires,, also can back adjust, until the suitable value that finds can just satisfy the structure requirement if adjust excessively.
Wherein, in described step 160, based on the nonsymmetric channel of being constructed, can do the research of many wireless channels aspect, as the test of up-downgoing radio transmission model and correction, the professional contrast that covers of up-downgoing, the contrast of up-downgoing volume of business, the contrast of up-downgoing quality of service; Also can do the research of send channel or receive channel aspect, as the contrast of the optimization of uplink downlink balance parameters, up-downgoing demodulation ability, up-downgoing modulation Parameter Optimization, the performance comparison of up-downgoing power control algorithm, the performance comparison of up-downgoing joint detection algorithm, the performance verification of up-downgoing intelligent antenna figuration algorithm, the performance verification of uplink synchronous algorithm, or the like.
Give an example, when optimizing the uplink downlink balance parameters, preferably can definitely obtain uplink and downlink signals variation tendency separately.For in research downstream signal variation tendency, can be because of up not limited and be affected, we can be on the initial parameter basis of the uplink downlink balance of coming out by system emulation, select suitable channel parameter to adjust, construct a nonsymmetric channel that descending elder generation is limited, so, with regard to not occurring because up limited and have influence on the research of down channel and tested.Conversely, the variation tendency of research upward signal also can realize by constructing the limited nonsymmetric channel of up elder generation.Like this, by the mode of structure nonsymmetric channel, we just can accurately and fully obtain the details that the uplink downlink of real system under various wireless environments changes, and giving design and optimizing the uplink downlink balance provides reliable basis.After all, the parameter that system emulation is come out is an initial value, owing to pre-set the limitation of condition, there is deviation unavoidably, and, also may not have versatility to various wireless environment, by research and test true under the real system, typical environment, can optimize these parameters better.
The method that this paper proposes also can promote and be applicable to that all have the communication system of two-way channel.
In sum, the inventive method is studied and is tested the channel of single direction based on nonsymmetric channel, thereby eliminated the backward channel interference effect of up-downgoing interchannel, be convenient to realize the independent studies and the test of up-downgoing channel, feasible test is more fully complete, and the result more accurately and reliably.
Should be understood that, for those of ordinary skills, can be improved according to the above description or conversion, and all these improvement and conversion all should belong to the protection range of claims of the present invention.
Claims (8)
1. method of constructing nonsymmetric channel, this method comprises the steps:
A, determine nonsymmetric channel and the earlier limited nonsymmetric channel of down channel that the nonsymmetric channel type of required structure, described nonsymmetric channel type comprise that up channel is earlier limited;
B, selective channel parameter are as the parameter of constructing described nonsymmetric channel;
C, to the default initial value of selected channel parameter;
D, verify described nonsymmetric channel;
After E, checking are passed through, research and the test that can be correlated with based on described nonsymmetric channel.
2. method according to claim 1 is characterized in that, described channel parameter comprises spreading gain, power gain, smart antenna gain and noise power.
3. method according to claim 3 is characterized in that, constructing the required channel parameter of described nonsymmetric channel is the combination of the one or more channel parameters in the described channel parameter.
4. method according to claim 1 is characterized in that step C comprises: by increasing the value of described channel parameter, default different channel parameter initial value.
5. method according to claim 1 is characterized in that step C comprises: by reducing the value of described channel parameter, default different channel parameter initial value.
6. method according to claim 1 is characterized in that, among the step D, described validation criteria adopts the degradation criterion of the uplink and downlink signals in the communication protocol.
7. method according to claim 7, it is characterized in that, when constructing the earlier limited nonsymmetric channel of up channel, validation criteria is exactly when signal limitation occurring, the Block Error Rate of upward signal continues T and surpasses deterioration value E second, and the Block Error Rate of downstream signal remains zero substantially, and wherein T is relevant with signal corresponding service type with E.
8. method according to claim 1 is characterized in that, in the step e, if checking do not pass through, continues the value of described selected channel parameter is adjusted, or selects other channel parameter to carry out relative set.
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| CN2007101247143A CN101163315B (en) | 2007-11-13 | 2007-11-13 | Method for constructing asymmetric channel |
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| CN101163315B true CN101163315B (en) | 2010-08-18 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1234156A (en) * | 1997-08-20 | 1999-11-03 | 三菱电机株式会社 | Mobile communication system |
| CN1282493A (en) * | 1997-11-19 | 2001-01-31 | 通信集合公司 | An adaptive time division duplexing method and apparatus for dynamic bandwidth allocation within wireless communication system |
| CN1344475A (en) * | 1999-03-23 | 2002-04-10 | 西门子公司 | Method and base station for allocating channel required for radio transmission |
| CN1719928A (en) * | 2004-07-09 | 2006-01-11 | 北京三星通信技术研究有限公司 | The dynamic channel assignment method that adapts to asymmetric up-downgoing service distribution |
| CN1829370A (en) * | 2005-03-04 | 2006-09-06 | 上海华为技术有限公司 | Dynamic channel distribution method for broadband CDMA mobile communication system |
| WO2006126962A2 (en) * | 2005-05-25 | 2006-11-30 | Telefonaktiebolaget Lm Ericsson (Publ) | Authentication of an application layer media flow request for radio resources |
-
2007
- 2007-11-13 CN CN2007101247143A patent/CN101163315B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1234156A (en) * | 1997-08-20 | 1999-11-03 | 三菱电机株式会社 | Mobile communication system |
| CN1282493A (en) * | 1997-11-19 | 2001-01-31 | 通信集合公司 | An adaptive time division duplexing method and apparatus for dynamic bandwidth allocation within wireless communication system |
| CN1344475A (en) * | 1999-03-23 | 2002-04-10 | 西门子公司 | Method and base station for allocating channel required for radio transmission |
| CN1719928A (en) * | 2004-07-09 | 2006-01-11 | 北京三星通信技术研究有限公司 | The dynamic channel assignment method that adapts to asymmetric up-downgoing service distribution |
| CN1829370A (en) * | 2005-03-04 | 2006-09-06 | 上海华为技术有限公司 | Dynamic channel distribution method for broadband CDMA mobile communication system |
| WO2006126962A2 (en) * | 2005-05-25 | 2006-11-30 | Telefonaktiebolaget Lm Ericsson (Publ) | Authentication of an application layer media flow request for radio resources |
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| CN101163315A (en) | 2008-04-16 |
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