CN102868493B - For conveying control channel information to carry out the method for adaptive coding and modulation - Google Patents
For conveying control channel information to carry out the method for adaptive coding and modulation Download PDFInfo
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Abstract
For conveying control channel information to carry out the method for adaptive coding and modulation.There is such problem: if using MIMO transmits, then add the quantity of variable element, thereby increase the quantity of the information bit needed for control channel.Also there is such problem: if increase the quantity of concurrent multiplexing user in single frame, then increase control channel information pro rata with number of users.In order to address these problems, use Adaptive Modulation and Coding scheme to the process of control channel information and executing error correction coding; Then by using the predetermined control channel information of encoding scheme to error correction coding to modulate, this control channel information is transmitted afterwards; And be arranged so that the encoding rate that can change according to spread state in error correction coding process further.
Description
The application to be original bill application number be 200580051722.9 application for a patent for invention (international application no: PCT/JP2005/018117, the applying date: on September 30th, 2005, denomination of invention: control channel information transferring method and use the base station of the method and terminal) divisional application.
Technical field
The present invention relates to a kind of control channel information transferring method and use base station and the terminal of the method, more particularly, relate to a kind of use control channel to control messaging parameter adaptively the control channel information transferring method for packet communication and use the base station of the method and terminal.
Background technology
In 3-G (Generation Three mobile communication system), use adaptive radio link, such as Adaptive Modulation/demodulation, HARQ(mixed automatic repeat request) and scheduling, increase the transmission efficiency of packet.
Use indivedual or public control channel to control such adaptive radio link, and the link parameter used in the data channel substantially side by side transmitted with control channel is informed to each user terminal.
Such as, when adaptive modulation and coding (AMC) scheme, control channel transmits modulation scheme and the encoding rate of data channel.When HARQ, control channel transmits the packet number of grouping and the information of number of retransmissions that such as will transmit on a data channel.When dispatching, control channel transmits the information of such as user ID.
3GPP(third generation Partnership Protocol according to 3-G (Generation Three mobile communication system)) standardized HSDPA(high-speed downlink packet access), as described in non-patent literature 1, by use be called the shared control channel of HS-SCCH(for HS-DSCH) Common Control Channel perform control information transmission as shown in table 1.
Table 1
| Channelizing code group information | 7 bits |
| Modulation scheme information | 1 bit |
| Transport block size information | 6 bits |
| Hybrid ARQ process information | 3 bits |
| Redundancy and planisphere (constellation) version | 3 bits |
| New data indicator | 1 bit |
| Ue identity | 16 bits |
In addition, according to above-mentioned HSDPA, when applying AMC scheme in the Fig. 1 showing the relation between radio environment and transfer rate, under good spread state (exceeding threshold level TH) in the radio environment I of change, by modulation scheme is set to 16QAM(quadrature amplitude modulation) perform high-speed data transfer with the encoding rate increased.
On the other hand, under bad spread state (lower than threshold level TH), by modulation scheme is set to QPSK(orthogonal PSK) carry out data transmission with low speed with the encoding rate reduced.
Like this, by using AMC scheme to change user's transfer rate, mass conservation is kept.That is, as shown in above-mentioned Fig. 1, according to HSDPA, the modulation scheme of HS-DSCH and encoding rate, user data can be changed according to spread state I.In addition, also the HS-SCCH as the control information relevant to above-mentioned user data is transmitted together with user data (HS-DSCH).
But, now, about HS-SCCH and control information, as show the relation between radio environment and amount of information Fig. 2 as shown in, be constant to the encoding rate of the error correction coding of control information IV, thus, no matter radio environment I is good or bad, and the amount of information that transmit keeps constant.
In the above cases, when under radio environment I is in shape, for the control information transmitted, quality has become excessively.
In addition, in next generation mobile communication system, in order to realize high-speed data transfer, have employed multicarrier transmission and using the MIMO(multiple-input and multiple-output of multiple antenna) transmit.In this case, radio parameter adaptive control can be used to improve transmission characteristic further with transmitting antenna based on each by subcarrier one by one.
When using above-mentioned MIMO, good or bad according to spread state I, perform the control of the using MIMO to whether, as shown in Figure 3.That is, in the Fig. 3 showing the relation whether between using MIMO and transfer rate, when using MIMO, transfer rate uprises, and when reverse situation, transfer rate step-down.
In addition, applicant of the present invention have previously been proposed following invention: according to the predetermined state (whether applying MIMO) in the transfer system adopting MIMO, from multiple control channel forms separately with different amount of information, select a control channel form, and use the control channel form of above-mentioned selection to carry out transfer control channel (international application WO/2006/070466 publication: after this referred to as previous application).
Above-mentioned previous application is for such supposition situation: according to whether applying MIMO, control channel information digit is different.As prerequisite, when to (interval I II) during user data applications MIMO, information digit IV increases, and as shown in Figure 4, and when not to user data applications MIMO, information digit reduces, as shown in Figure 5.
Thus, apply as shown in Fig. 6 of the relation between control channel amount of information as shown at MIMO, in the interval I II of communication environments I applying MIMO, there is following problem: the quantity of variable element increases, and the information digit required for control channel increases.In addition, when the quantity of the concurrent multiplexing user in single frame increases, there is the problem that control channel information also increases pro rata with number of users.
[non-patent literature 1]
3GPP TS 25.212V5.9.0（2004-06）
Summary of the invention
The problem to be solved in the present invention
Thus, the present invention is absorbed in by making variable the solving of encoding rate of the error correction coding to HS-SCCH and control channel information apply AMC(adaptive modulation and coding) multicomponent data of scheme transmit in the problems referred to above.
The means of dealing with problems
As a first aspect of the present invention solved the problem, control channel information transferring method comprises the following steps: based on adaptive modulation and coding scheme to control channel information and executing error correction coding; By using predetermined modulation scheme, the control channel information through error correction coding is modulated and transmitted; Further, make the encoding rate in error correction coding different according to spread state.
In addition, as a second aspect of the present invention solved the problem, control channel information transferring method comprises the following steps: use constant encoding rate, based on adaptive modulation and coding scheme to control channel information and executing error correction coding; By using predetermined modulation scheme, this control channel information through error correction coding is modulated and transmitted; Further, before modulation, according to spread state, code extraction or code repetition are carried out to this signal through error correction coding.
In addition, as a third aspect of the present invention solved the problem, the control channel message transfer system based on adaptive modulation and coding scheme comprises: error correction encoding unit, and it carries out error correction coding in base station side to control channel information; And modulating unit, it is modulated by the coding output of predetermined modulation scheme to error correction encoding unit.In addition, arrange as follows: make the encoding rate in error correction encoding unit different according to spread state.
In addition, in above-mentioned, the encoding rate of control channel when applying multiple-input and multiple-output be set to be greater than encoding rate when not applying multiple-input and multiple-output, thus no matter whether apply multiple-input and multiple-output, transmit code bit number all constant.
In above-mentioned, at receiver side, each error correction decoding unit corresponding with the encoding rate different according to spread state performs the error correction decoding to the signal jointly received, in addition, determine the likelihood of the signal through error correction decoding, and export based on likelihood determination result be confirmed as effective through error correction decoding signal.
By the embodiments of the present invention described with reference to the accompanying drawings, feature of the present invention will become obvious.
Accompanying drawing explanation
Fig. 1 illustrate the HS-DSCH of the HSDPA as prior art AMC control in radio environment and transfer rate between relation.
Fig. 2 illustrates as the relation between the radio environment in the HS-SCCH of the HSDPA of prior art and amount of information.
The relation applied between radio environment in the HS-DSCH of MIMO and transfer rate illustrated in previously application of Fig. 3.
The embodiment illustrating the control channel form when using MIMO of Fig. 4.
The embodiment illustrating the control channel form when not using MIMO of Fig. 5.
The figure of the radio environment in the HS-SCCH illustrating when using MIMO of Fig. 6 and the relation between amount of information.
Fig. 7 shows and applies the structured flowchart comprising the transfer system of base station 1 and user terminal 2 of the present invention.
The structure illustrating the control channel generating unit 12 of the invention corresponding to previously application of Fig. 8.
First example arrangement illustrated according to control channel generating unit 12 of the present invention of Fig. 9.
Relation between the application illustrating MIMO when applying the invention of Figure 10 and control channel amount of information.
Another example arrangement illustrated according to control channel generating unit 12 of the present invention of Figure 11.
The example arrangement illustrated according to the control channel demodulating part in user terminal of the present invention of Figure 12.
Figure 13 A and 13B illustrates effect of the present invention and uses comparing of the situation of the invention previously applied for.
Embodiment
Below, embodiments of the present invention are described with reference to the drawings.
Fig. 7 shows and applies the structured flowchart comprising the transfer system of base station 1 and user terminal 2 of the present invention.Specifically, the invention is characterized in the structure of the execution mode of control channel generating unit 12.
About the downlink control channel transmission from base station 1 to user terminal 2, use the execution mode applying the previous application of MIMO to describe feature of the present invention.But application of the present invention is not limited to the transfer system structure shown in Fig. 7.
Form selection/specifying part 10 in base station 1 is based on comprising the quantity of users multiplexing, the sending/receiving function of user terminal, down link QoS and down link CQI(CQI) information, select control channel form.
Here, the embodiment of the control channel form selected is as before as shown in Fig. 4 (table 2) and Fig. 5 (table 3).
Control format A shown in Fig. 4 comprises modulation scheme (antenna 1)-modulation scheme (antenna 4), encoding rate, spreading factor and Ma Ji, as adaptive control parameter.Such as, in modulation scheme (antenna 1)-modulation scheme (antenna 4), be provided with four (4) individual modulation scheme types (QPSK, 8PSK, 16QAM, 64QAM) as variable range.In the above-mentioned control channel form A illustrated in table 2, the type of auto-adaptive parameter and variable range are very wide, and such as, when MIMO transmits, modulation scheme can antenna ground change one by one.
Meanwhile, the control format B shown in Fig. 5 comprises modulation scheme (be common to antenna), encoding rate, spreading factor and Ma Ji, as adaptive control parameter.Such as, in modulation scheme (jointly), be provided with two modulation scheme types (QPSK, 16QAM) as variable range.In the above-mentioned control channel form B illustrated in table 3, compared with control channel form A, the type of adaptive control parameter and variable range are limited, and figure place is approximately 1/2 of control channel form A.
Referring back to Fig. 7, via selector 15 and transmitter 16, will represent that the message notice of specifying of the control channel form selected form selection/specifying part 10 is to user terminal 2, as signaling information from signaling generating unit 11.And, format specification information is informed to control channel generating unit 12 and data channel generating unit 13.
Control channel generating unit 12 is characteristics of the present invention, and has the different structure of execution mode and function that correspond to and describe subsequently, but based on structure, this structure comprises error correction encoding unit and modulating unit.
Carry out multiplexing based on format specification information to the control channel generated in control channel generating unit 12 and data channel generating unit 13 and data channel in multiplexing unit 14, after this, by transmitter 16, control channel and data channel are sent to user terminal 2 via down link.
Signal demodulation portion 22 in user terminal 2 carries out demodulation to the signaling information notified from base station 1 by receiver 20 (format specification information), and downlink control channel form is informed to control channel demodulation section 23.Control channel demodulation section 23, based on the downlink control channel form notified from signal demodulation portion 22, carries out demodulation to control channel.The down link self adaption controling parameters demodulated from control channel is informed to data channel demodulation portion 21 by control channel demodulation section 23.
Data channel demodulation portion 21 uses the adaptive control parameter notified from control channel demodulation section 23, performs the demodulation to data channel.
Propagation path measurement section 24 in user terminal 2 measures the down link CQI for selecting downlink control channel form.By down link CQI being sent to base station 1 with up link QoS together with the sending/receiving function of user terminal 2 from user terminal 2 to the uplink control channel of base station 1.
Next, the uplink control channel transmission from user terminal 2 to base station 1 will be described.
Be similar to down link control format, in the form selection/specifying part 10 of base station 1, select uplink control channel format.In order to select uplink control channel format, using and comprising quantity, the sending/receiving function of user terminal, up link QoS, the up link CQI(CQI of users multiplexing) etc. information set.
Via selector 15 and transmitter 16, selected up link control format is informed to user terminal 2, as signaling information from signaling generating unit 11.Signal demodulation portion 22 carries out demodulation to the signaling information notified from base station 1, determine the appointment (multiplexing method) of control channel in up link and data channel, and above-mentioned format specification information is informed to control channel generating unit 25 and data channel generating unit 27.
In base station 1, by being selected by form/uplink control channel format that specifying part 10 is selected informs to control channel demodulation section 18 for up link.
Control channel demodulation section 18, based on the uplink control channel format notified from form selection/specifying part 10, carries out demodulation to control channel.The adaptive uplink controling parameters demodulated is informed to data channel demodulation portion 19 by control channel demodulation section 18.
Data channel demodulation portion 19 uses the adaptive control parameter notified from control channel demodulation section 18, performs the demodulation process to data channel.The up link CQI for selecting uplink control channel format is measured by the propagation path measurement section 17 in base station 1.
In addition, from propagation path measurement section 17, the up link CQI of measurement is informed to form selection/specifying part 10.And, the sending/receiving function of up link QoS, down link CQI and user terminal 2 by being sent to base station 1 from user terminal 2 to the uplink control channel of base station 1 is sent to form selection/specifying part 10.
Next, in the figure 7, the example arrangement of the control channel generating unit 12 forming feature of the present invention will be described.Here, in previously application, assumed the situation of using MIMO, wherein, whether the quantity of control channel information bit according to using MIMO and different, as shown in Figures 4 and 5.
Namely, from multiple control channel form, select and use a control channel form, making when to the quantity comparatively large (with reference to figure 4) controlling channel information collection during user data applications MIMO, and when not to the quantity less (Fig. 5) of control channel information collection during user data applications MIMO.
In these cases, the structure of control channel generating unit 12 as shown in Figure 8.
Provide error correction encoding unit 120 and modulating unit 121.Error correction coding is performed in error correction encoding unit 120, corresponding with it, in the control channel demodulation section 23 of user terminal 2 side, perform error correction decoding.
Now, allow encoding rate R be R=0.241, wherein R is the ratio of code information digit and its transmission code bit number obtained by error correction coding that will send.When non-using MIMO in fig. 8, the code information digit in the frame that send is 68, and sends code bit number and become 282=(68 × 1/0.241) position.
Meanwhile, when using MIMO, if the code information digit in the frame that will send is 141, then sends code bit number and become 585=(141 × 1/0.241) position.
Like this, because encoding rate is fixed, so there is such problem: send code bit number when using MIMO and become large, as shown in Figure 6.
Thus, target of the present invention solves the problem.
First example arrangement illustrated according to control channel generating unit 12 of the present invention of Fig. 9.Be similar to the structure shown in Fig. 8, control channel generating unit 12 comprises error correction encoding unit 120 and modulating unit 121.
The feature being different from structure shown in Fig. 8 is the encoding rate in error correction encoding unit 120 is transformable.
The situation of unitary Item rate is more weak relative to propagation path mistake, and the situation of lower Item rate is stronger relative to propagation path mistake.Meanwhile, the using MIMO when seldom there is propagate errors, and when frequently there is propagate errors not using MIMO.
Therefore, according to the present invention, when to user data applications MIMO, the encoding rate generating the error correction encoding unit of control channel increases.On the contrary, when not to user data applications MIMO, the encoding rate generating the error correction encoding unit of control channel reduces.
As an execution mode, when to user data applications MIMO, the encoding rate of the error correction encoding unit 120 in control channel generating unit 12 is set to 0.5.
Thus, sending code bit number is 282(=141 ÷ 0.5), and when not to user data applications MIMO, exemplary cases as shown in Figure 8, the encoding rate in error correction encoding unit 120 is set to 0.24, and therefore transmits 282(=141 ÷ 0.5) bit.
Thus, no matter whether using MIMO, it is the same for sending code bit number, can obtain constant control information quality and not waste radio resource.
Relation between the application illustrating MIMO when applying the invention of Figure 10 and control channel amount of information.Compared with Fig. 6, even if using MIMO, the transmission code bit number of error correction coding also can be made constant.Therefore, can to avoid waste resource.
Another example arrangement illustrated according to control channel generating unit 12 of the present invention of Figure 11.In the present embodiment, there is such feature: between error correction encoding unit 120 and modulating unit 121, provide the unit 122 optionally applying perforation (puncture) function or repeat function.
That is, according to the present embodiment, no matter whether using MIMO, all makes the encoding rate of error correction encoding unit 120 constant.Meanwhile, be set to as follows: by providing the unit 122 with perforation function or repeat function at the output of error correction encoding unit 120, come to change encoding rate with equivalent way.
Thus, the input of modulating unit 121 makes encoding rate variable, this has same meaning with the structure of the control channel generating unit 12 shown in Fig. 9.
Now, when providing perforation function, by perforation function, when using MIMO, unit 122 performs the extraction process of the output data to error correction encoding unit 120 at a certain time interval.When not using MIMO, the output data of error correction encoding unit 120 are passed through without change.Thus, no matter whether using MIMO, when the output of error correction encoding unit 120 is input to modulating unit 121, bit count is the same.
In addition, when providing repeat function, by repeat function, when not using MIMO, the identical bits of the unit 122 repeatedly output data of error-correcting code unit 120.Equally, in this case, the transmission figure place when not using MIMO also can be made substantially equal with transmission figure place during using MIMO.
Figure 12 shows another embodiment of the present invention.In transfer system shown in Figure 7, as the function of the signaling generating unit 11 in base station 1, notify the form whether applied in MIMO and control channel generating unit 12.Execution mode shown in Figure 12 makes the above-mentioned functions of signaling generating unit 11 unnecessary.
That is, in user terminal 2 i.e. receiver side, the two kinds of control channel forms corresponding to using MIMO and the not situation of using MIMO are used to receive.So, detect from the data received and be revealed as correct any one form.Thus, base station 1 i.e. transmitter side can by whether using MIMO informs to receiving terminal, and without the need to using information bit resource to notify whether using MIMO.
In the control channel demodulation section 23 shown in Figure 12, carrying out on the outlet side of demodulator 230 of demodulation without the need to carrying out signal demodulation to the signal sent from side, base station 1, provide two error correction decoding unit 231a, 231b, correspond respectively to above-mentioned two kinds of control channel forms.
First error correction decoding unit 231a obtains correct output when can carry out error correction decoding in the frame signal being 68 to figure place during not using MIMO.For this reason, error correction decoding unit 231a performs error correction decoding based on encoding rate=0.24 of supposition.
Meanwhile, correct output is obtained when the second error correction decoding unit 231b can carry out error correction decoding in the frame signal to figure place during using MIMO being 141.For this reason, encoding rate=0.5 based on supposition performs error correction decoding.
Reliability is determined to determine which decoded result is revealed as correctly with selected cell 232 according to the output of the first error correction decoding unit 231a and the second error correction decoding unit 231b, and selects the output of the either side of error correction decoding unit 231a, 231b based on the above results.
Thus, the information bit resource for notifying whether using MIMO may be saved.
Figure 13 A and 13B illustrates effect of the present invention and uses comparing of the situation of the invention previously applied for.
Figure 13 A shows the transmission power ratio from the base station using HSDPA.In Figure 13 A, all the other power unshowned are corresponding to the power being assigned to Traffic Channel.
Figure 13 B shows based on the channel quantity in HS-SCCH from the available horsepower the Traffic Channel that Figure 13 A obtains.As previously described, according to the invention in previously application, even if amount of information is very large, the encoding rate of HS-SCCH is also constant.The using MIMO according to whether, the available horsepower of Traffic Channel dissimilates (III with reference in figure 13B).On the contrary, according to the present invention, above-mentioned power invariability (IV with reference in figure 13B).
Such as, when Traffic Channel is two channels (arrow in Figure 13 B shown in), at power perspective, effect of the present invention compared with the invention in previously applying for, be its 1.5 times greatly.
Industrial applicability
As described with reference to the accompanying drawings, in the present invention, can change according to control channel pattern by making the encoding rate of error correction coding, no matter spread state is well still bad, delivery quality can be kept constant, in addition, even if using MIMO, the post stall maneuver control that control information position is transmitted can also be prevented.
Claims (2)
1. for conveying control channel information to carry out a method for adaptive coding and modulation, described method comprises:
In transfer station,
With predetermined encoding rate, error correction coding is carried out to described control channel information;
Modulate according to predetermined modulation schemes and transmit the control channel information through error correction coding; And
Before described modulation, when applying multiple-input and multiple-output, also code extraction being carried out to the control channel information through error correction coding, making the quantity of output bit of the control channel information through error correction coding when applying multiple-input and multiple-output be identical with the quantity of the output bit of the control channel information through error correction coding when not applying multiple-input and multiple-output.
2. method according to claim 1,
In receiving station,
Receive and the described control channel information transmitted from described transfer station according to described predetermined modulation schemes demodulation; And
Error correction decoding is carried out to the control channel information through demodulation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2005800517229A CN101273598B (en) | 2005-09-30 | 2005-09-30 | Control channel information transfer method and base station and terminal using the same |
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| CN2005800517229A Division CN101273598B (en) | 2005-09-30 | 2005-09-30 | Control channel information transfer method and base station and terminal using the same |
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| CN102868493B true CN102868493B (en) | 2015-10-14 |
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| CN201210363651.8A Active CN102882646B (en) | 2005-09-30 | 2005-09-30 | Control channel information transmission system |
| CN201210363816.1A Active CN102882649B (en) | 2005-09-30 | 2005-09-30 | Communication means |
| CN201210363832.0A Active CN102868491B (en) | 2005-09-30 | 2005-09-30 | Base station and user terminal used for receiving control channel information from transmitting station |
| CN201210363689.5A Active CN102904681B (en) | 2005-09-30 | 2005-09-30 | For conveying control channel information to carry out the method for adaptive coding and modulation |
| CN201210363844.3A Active CN102868493B (en) | 2005-09-30 | 2005-09-30 | For conveying control channel information to carry out the method for adaptive coding and modulation |
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| CN201210363816.1A Active CN102882649B (en) | 2005-09-30 | 2005-09-30 | Communication means |
| CN201210363832.0A Active CN102868491B (en) | 2005-09-30 | 2005-09-30 | Base station and user terminal used for receiving control channel information from transmitting station |
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| JP4412005B2 (en) * | 2004-03-05 | 2010-02-10 | 株式会社日立製作所 | Adaptive modulation method and data rate control method |
| CN102404080B (en) * | 2005-09-30 | 2014-07-02 | 富士通株式会社 | Control channel information transmission method |
| EP2667558B1 (en) * | 2005-09-30 | 2015-02-18 | Fujitsu Limited | Control channel information transmission method, and base station and terminal using the same method |
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Also Published As
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| HK1180847A1 (en) | 2013-10-25 |
| CN102882649A (en) | 2013-01-16 |
| HK1175616A1 (en) | 2013-07-05 |
| CN102882646A (en) | 2013-01-16 |
| CN102868493A (en) | 2013-01-09 |
| CN102882648A (en) | 2013-01-16 |
| CN102882648B (en) | 2015-12-09 |
| CN102882649B (en) | 2015-09-30 |
| CN102868491A (en) | 2013-01-09 |
| CN102904681B (en) | 2015-09-02 |
| CN102868491B (en) | 2015-07-08 |
| CN102904681A (en) | 2013-01-30 |
| CN102882646B (en) | 2015-07-08 |
| HK1180849A1 (en) | 2013-10-25 |
| CN102904680A (en) | 2013-01-30 |
| CN102904680B (en) | 2015-07-29 |
| HK1175618A1 (en) | 2013-07-05 |
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