CN102404080B - Control channel information transmission method - Google Patents
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- CN102404080B CN102404080B CN201210001093.0A CN201210001093A CN102404080B CN 102404080 B CN102404080 B CN 102404080B CN 201210001093 A CN201210001093 A CN 201210001093A CN 102404080 B CN102404080 B CN 102404080B
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Abstract
Such problem, that the number of variable parameters is increased if information is transmitted by MIMO (Multiple Input Multiple Output) and therefore the number (figure 6, III) of information bits required by a control channel is increased, is existent. Also such problem, that the control channel information is increased proportional to the number of users if the number of synchronous multiplexing users is increased in a single frame, is existent. In order to solve these problems, error correction encoding treatment is carried out on the control channel information by using an adaptive modulation encoding scheme; the control channel information after the error correction encoding treatment is modulated by using the predefined encoding scheme and then is sent; and the control channel information is further set in such a way that the encoding rate in the error correction encoding treatment can be changed according to a transmission state.
Description
The application is that original bill application number is 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 base station and the terminal of the method) 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 and a kind ofly control adaptively the control channel information transferring method for packet communication of messaging parameter and use base station and the terminal of the method with control channel.
Background technology
In 3-G (Generation Three mobile communication system), use adaptive radio link, for example Adaptive Modulation/demodulation, HARQ(mixed automatic repeat request) and dispatch, the transmission efficiency of packet increased.
Use indivedual or public control channel to control such adaptive radio link, and the link parameter using in the data channel substantially side by side transmitting with control channel is notified to each user terminal.
For example, the in the situation that of adaptive modulation and coding (AMC) scheme, control channel transmits modulation scheme and the encoding rate of data channel.The in the situation that of HARQ, control channel transmits such as the packet number of the grouping that will transmit on data channel and the information of number of retransmissions.The in the situation that of scheduling, control channel transmits the information such as user ID.
According to the 3GPP(third generation partner agreement of 3-G (Generation Three mobile communication system)) standardized HSDPA(high-speed downlink packet access), described at non-patent literature 1, be called the shared control channel of HS-SCCH(for HS-DSCH by use) Common Control Channel carry out control information transmission as shown in table 1.
Table 1
| Channelizing code character information | 7 bits |
| |
1 bit |
| Transport block size information | 6 bits |
| Hybrid |
3 bits |
| Redundancy and planisphere (constellation) |
3 bits |
| |
1 |
| Ue identity | |
| 16 bits |
in addition, according to above-mentioned HSDPA, in the time applying AMC scheme in the Fig. 1 that is showing the relation between radio environment and transfer rate, under good spread state (exceeding threshold level TH) in the radio environment I changing, be set to 16QAM(quadrature amplitude modulation by modulation scheme) use the encoding rate increasing to carry out high-speed data transfer.
On the other hand, under bad spread state (lower than threshold level TH), be set to QPSK(orthogonal PSK by modulation scheme) with reduce encoding rate carry out data transmission with low speed.
Like this, by using AMC scheme to change user's transfer rate, keep mass conservation.,, 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, be control information about HS-SCCH, as show as shown in the Fig. 2 of the relation between radio environment and amount of information, the encoding rate of the error correction coding to control information IV is constant, thus, no matter radio environment I is well still bad, it is constant that the amount of information that transmit keeps.
Above-mentioned in the situation that, when radio environment I lower time in shape, for the control information transmitting, quality has become excessively.
In addition,, in next generation mobile communication system, in order to realize high-speed data transfer, adopted multicarrier transmission and used the MIMO(multiple-input and multiple-output of multiple antennas) transmit.In this case, can and transmit antenna based on each and further improve transmission characteristic with radio parameter adaptive control by subcarrier one by one.
In the time using above-mentioned MIMO, well still bad according to spread state I, carry out the control of the using MIMO to whether, as shown in Figure 3.That is, showing in Fig. 3 of the relation between using MIMO and transfer rate whether, in the time of using MIMO, transfer rate uprises, and in the time of reverse situation, transfer rate step-down.
In addition, applicant of the present invention had previously proposed following invention: according to the predetermined state (whether having applied MIMO) in the transfer system that adopts MIMO, from there are separately multiple control channel forms of different amount of information, select a control channel form, and carry out transfer control channel (International Application No. WO/No. 2006/070466 communique: after this referred to as previous application) with the control channel form of above-mentioned selection.
Above-mentioned previous application is for such supposition situation: according to whether having applied MIMO, control channel information digit is different.As prerequisite, when to user data applications MIMO (interval I II), 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, as show as shown in the Fig. 6 of the relation between MIMO application and control channel amount of information, in the interval I II of communication environments I that has applied MIMO, have following problem: the quantity of variable element increases, and the needed information digit of control channel increases.In addition, in the time that the quantity of the concurrent multiplexing user in single frame increases, the problem that exists control channel information also to increase pro rata with number of users.
[non-patent literature 1]
3GPP?TS25.212V5.9.0（2004-06）
Summary of the invention
The problem to be solved in the present invention
Thus, the present invention be absorbed in by variable the solving of encoding rate that to make HS-SCCH be the error correction coding of control channel information applied AMC(adaptive modulation and coding) multicomponent data of scheme the problems referred to above in transmitting.
The means of dealing with problems
As a first aspect of the present invention addressing the above 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; And, make the encoding rate in error correction coding different according to spread state.
In addition, as a second aspect of the present invention addressing the above 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; And, before modulation, according to spread state, this signal through error correction coding is carried out to code extraction or code repetition.
In addition, as a third aspect of the present invention addressing the above problem, the control channel message transfer system based on adaptive modulation and coding scheme comprises: error correction coding unit, and it carries out error correction coding in base station side to control channel information; And modulating unit, it is modulated the coding output of error correction coding unit by predetermined modulation scheme.In addition, arrange as follows: make the encoding rate in error correction coding unit different according to spread state.
In addition, aspect above-mentioned, the encoding rate of the control channel while having applied multiple-input and multiple-output is set to be greater than the encoding rate while not applying multiple-input and multiple-output, thereby no matter whether apply multiple-input and multiple-output, transmits code bit number all constant.
Aspect above-mentioned, at receiver side, with according to spread state and the error correction decoding of the signal to common reception is carried out in corresponding each error correction decoding unit of different encoding rate, in addition, determine the likelihood through the signal of error correction decoding, and determine result and export and be confirmed as effectively through error correction decoding signal based on likelihood.
By the embodiments of the present invention of describing with reference to the accompanying drawings, it is obvious that feature of the present invention will become.
Brief description of the drawings
Fig. 1 illustrates radio environment in controlling as the AMC of the HS-DSCH of the HSDPA of prior art and the relation between transfer rate.
Fig. 2 illustrates as the radio environment in the HS-SCCH of the HSDPA of prior art and the relation between amount of information.
Illustrated application in the previous application radio environment in the HS-DSCH of MIMO of Fig. 3 and the relation between transfer rate.
The embodiment that illustrates the control channel form in the time of using MIMO of Fig. 4.
The embodiment that illustrates the control channel form in the time of using MIMO not of Fig. 5.
The figure that illustrates the relation between radio environment and the amount of information in the HS-SCCH in the time of using MIMO of Fig. 6.
Fig. 7 shows the structured flowchart of having applied the transfer system that comprises base station 1 and user terminal 2 of the present invention.
Fig. 8 illustrates corresponding to the previous structure of the control channel generating unit 12 of the invention of application.
Fig. 9 illustrates the first example arrangement according to control channel generating unit 12 of the present invention.
Relation between the application and the control channel amount of information that illustrate MIMO in the time that application is of the present invention of Figure 10.
Figure 11 illustrates another example arrangement according to control channel generating unit 12 of the present invention.
Figure 12 illustrates according to the example arrangement of the control channel demodulation parts in user terminal of the present invention.
Figure 13 illustrates effect of the present invention and uses the previously comparison of the situation of the invention of application.
Embodiment
Below, embodiments of the present invention are described with reference to the drawings.
Fig. 7 shows the structured flowchart of having applied the transfer system that comprises 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 of the previous application of having applied 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, sending/receiving function, down link QoS and the down link CQI(CQI of user terminal) information, select control channel form.
The embodiment of the control channel form that select here, 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.For example, 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 shown in table 2, the type of auto-adaptive parameter and variable range are very wide, and for example, in the time that MIMO transmits, modulation scheme changes on antenna ground one by one.
Meanwhile, the control format B shown in Fig. 5 comprises modulation scheme (being common to antenna), encoding rate, spreading factor and Ma Ji, as adaptive control parameter.For example, in modulation scheme (being common to antenna), be provided with two modulation scheme types (QPSK, 16QAM) as variable range.In the above-mentioned control channel form B shown 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, from signaling generating unit 11, the information of the appointment that is illustrated in the control channel form of selecting form selection/specifying part 10 is notified to user terminal 2, as signaling information.And, form appointed information is notified 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 different structure and function corresponding to the execution mode of describing subsequently, but as foundation structure, this structure comprises error correction coding unit and modulating unit.
In multiplexing unit 14, carry out multiplexing based on form appointed information to the control channel and the data channel that generate in control channel generating unit 12 and data channel generating unit 13, after this, by transmitter 16, control channel and data channel are sent to user terminal 2 via down link.
Data channel demodulation portion 21 is used the adaptive control parameter of notifying from control channel demodulation section 23, carries out the demodulation to data channel.
The down link CQI that propagation path measurement section 24 in user terminal 2 is measured for selecting downlink control channel form.Together with the sending/receiving function of down link CQI and up link QoS and user terminal 2, be sent to base station 1 by the uplink control channel from user terminal 2 to base station 1.
Next, by the uplink control channel transmission of describing from user terminal 2 to base station 1.
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, use and comprise 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 notified to user terminal 2, as signaling information from signaling generating unit 11.Signal demodulation portion 22 carries out demodulation to the signaling information of notifying from base station 1, determine control channel in up link and the appointment (multiplexing method) of data channel, and above-mentioned form appointed information is notified to control channel generating unit 25 and data channel generating unit 27.
In base station 1, the uplink control channel format that selected by form/specifying part 10 is selected is notified to the control channel demodulation section 18 for up link.
The uplink control channel format of control channel demodulation section 18 based on notifying from form selection/specifying part 10, carries out demodulation to control channel.Control channel demodulation section 18 notifies the adaptive uplink control parameter demodulating to data channel demodulation portion 19.
Data channel demodulation portion 19 is used the adaptive control parameter of notifying from control channel demodulation section 18, carries out the demodulation process to data channel.Measure the up link CQI for selecting uplink control channel format 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 notified to form selection/specifying part 10.And, up link QoS, down link CQI by be sent to base station 1 from user terminal 2 to the uplink control channel of base station 1 and the sending/receiving function of user terminal 2 are sent to form selection/specifying part 10.
Next,, in Fig. 7, will the example arrangement of the control channel generating unit 12 that forms feature of the present invention be described.Here, in previously application, supposed the situation of using MIMO, wherein, whether the quantity of control channel information bit according to using MIMO and difference, as shown in Figures 4 and 5.
; from multiple control channel forms; select and use a control channel form, make to control large (with reference to the figure 4) of quantity of channel information collection when to user data applications MIMO, and when not to user data applications MIMO, controlling the quantity less (Fig. 5) of channel information collection.
In these cases, the structure of control channel generating unit 12 as shown in Figure 8.
Error correction coding unit 120 and modulating unit 121 are provided.In error correction coding unit 120, carry out error correction coding, corresponding with it, in the control channel demodulation section 23 of user terminal 2 sides, carry out error correction decoding.
Now, allow the encoding rate R be R=0.241, wherein R is the code information digit that will send and the ratio of its transmission code bit number obtaining by error correction coding.When in Fig. 8 not when using MIMO, the code information digit in the frame that send is 68, becomes 282=(68 × 1/0.241 and send code bit number) position.
Meanwhile, in the time of using MIMO, if the code information digit in the frame sending is 141, sends code bit number and become 585=(141 × 1/0.241) position.
Like this, because encoding rate fixes, so there is such problem: send code bit number and become large in the time of using MIMO, as shown in Figure 6.
Thus, target of the present invention is to address the above problem.
Fig. 9 illustrates the first example arrangement according to control channel generating unit 12 of the present invention.Be similar to the structure shown in Fig. 8, control channel generating unit 12 comprises error correction coding unit 120 and modulating unit 121.
The feature that is different from structure shown in Fig. 8 is that the encoding rate in error correction coding unit 120 is transformable.
The situation of unitary Item rate with respect to propagation path mistake a little less than, and the situation of lower Item rate is stronger with respect to propagation path mistake.Meanwhile, using MIMO in the time seldom there is propagate errors, and in the time frequently there is propagate errors using MIMO not.
Therefore,, according to the present invention, when to user data applications MIMO, the encoding rate that generates the error correction coding unit of control channel increases.On the contrary, when not to user data applications MIMO, the encoding rate that generates the error correction coding unit of control channel reduces.
As an execution mode, when to user data applications MIMO, the encoding rate of the error correction coding 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 coding unit 120 is set to 0.24, and therefore transmits 282(=141 ÷ 0.5) bit.
Thus, no matter using MIMO whether, it is the same sending code bit number, can obtain constant control information quality and does not waste radio resource.
Relation between the application and the control channel amount of information that illustrate MIMO in the time that application is of the present invention of Figure 10.Compare with Fig. 6, even if using MIMO also can make the transmission code bit number of error correction coding constant.Therefore, the resource of can avoiding waste.
Figure 11 illustrates another example arrangement according to control channel generating unit 12 of the present invention.In the present embodiment, there is such feature: between error correction coding unit 120 and modulating unit 121, provide the unit 122 of optionally applying perforation (puncture) function or repeat function.
, according to present embodiment, no matter using MIMO whether all makes the encoding rate of error correction coding unit 120 constant.Meanwhile, be set to as follows: by the unit 122 with perforation function or repeat function is provided at the output of error correction coding unit 120, come to change encoding rate with equivalent way.
Thus, on the input of modulating unit 121, make encoding rate variable, this has same meaning with the structure of the control channel generating unit 12 shown in Fig. 9.
Now, in the situation that perforation function is provided, by perforation function, in the time of using MIMO, unit 122 is carried out the extraction processing of the output data to error correction coding unit 120 at a certain time interval.In the time of using MIMO not, the output data of error correction coding unit 120 are passed through without changing.Thus, no matter using MIMO whether, in the time that the output of error correction coding unit 120 is input to modulating unit 121, bit count is the same.
In addition,, in the time that repeat function is provided, by repeat function, in the time of using MIMO not, unit 122 is the identical bits of the output data of error-correcting code unit 120 repeatedly.Equally, in this case, the transmission figure place also can make transmission figure place in the time of using MIMO not with using MIMO time equates substantially.
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, whether notice has applied the form 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, be in receiver side at user terminal 2, use corresponding to using MIMO and not two kinds of control channel forms of the situation of using MIMO receive.So, detect and be revealed as correct any form from the data that receive.Thus, base station 1 is that transmitter side can be by whether using MIMO is notified to receiving terminal, and without whether notify using MIMO by information bit resource.
In the control channel demodulation section 23 shown in Figure 12, without carrying out signal demodulation, the signal sending from base station 1 side is being carried out the outlet side of demodulating unit 230 of demodulation, two error correction decoding unit 231a, 231b are provided, have corresponded respectively to above-mentioned two kinds of control channel forms.
The first error correction decoding unit 231a can when to using MIMO not, figure place be 68 frame signal obtain correct output while carrying out error correction decoding.For this reason, error correction decoding is carried out in encoding rate=0.24 of error correction decoding unit 231a based on supposition.
Meanwhile, the frame signal that the second error correction decoding unit 231b can figure place be 141 when to using MIMO obtains correct output while carrying out error correction decoding.For this reason, error correction decoding is carried out in encoding rate=0.5 based on supposition.
Reliability is determined and selected cell 232 determines that according to the output of the first error correction decoding unit 231a and the second error correction decoding unit 231b which decoded result is revealed as correctly, and selects the output of the either side of error correction decoding unit 231a, 231b based on the above results.
Thus, may save for whether notifying the information bit resource of using MIMO.
Figure 13 illustrates effect of the present invention and uses the previously comparison of the situation of the invention of application.
Figure 13 A shows the transmitted power ratio from the base station of use HSDPA.In Figure 13 A, unshowned all the other power are corresponding to the power that is assigned to Traffic Channel.
Figure 13 B shows the available horsepower the Traffic Channel that the channel quantity based in HS-SCCH obtains from Figure 13 A.As previously described, according to the invention in previous 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 dissimilate (with reference to the III in figure 13B).On the contrary, according to the present invention, above-mentioned power invariability (with reference to the IV in figure 13B).
For example, in the situation that Traffic Channel is two channels (shown in the arrow in Figure 13 B), in power angle, effect of the present invention is compared with the invention in previously application, be its 1.5 times large.
Industrial applicability
As described with reference to the accompanying drawings, in the present invention, can change according to control channel pattern by the encoding rate that makes error correction coding, no matter spread state is well still bad, can keep delivery quality constant, in addition, even if using MIMO also can prevent the superfluous quality that control information position is transmitted.
Claims (1)
1. conveying control channel information is to carry out a method for adaptive coding and modulation, and the method comprises the following steps:
To control channel information and executing error correction coding;
According to predetermined modulation scheme, the control channel information of this error correction coding is modulated and transmitted;
Also application when multiple-input and multiple-output before described modulation the encoding rate of this control channel information be set to be greater than the encoding rate while not applying multiple-input and multiple-output, to make the figure place that transmits code become set-point, and with whether to apply multiple-input and multiple-output irrelevant;
The described control channel information that receives and transmit from transmission sites according to described predetermined modulation scheme demodulation; And
According to whether having applied multiple-input and multiple-output, accordingly the control channel information through demodulation is carried out to error correction decoding with corresponding encoding rate.
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|---|---|---|---|
| CN201210001093.0A CN102404080B (en) | 2005-09-30 | 2005-09-30 | Control channel information transmission method |
| HK12109576.9A HK1168963A1 (en) | 2005-09-30 | 2012-09-28 | Control channel information transmission method |
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| CN201210001093.0A CN102404080B (en) | 2005-09-30 | 2005-09-30 | Control channel information transmission method |
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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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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004012370A1 (en) * | 2002-07-29 | 2004-02-05 | Matsushita Electric Industrial Co., Ltd. | Radio device and base station device |
| JP2005175542A (en) * | 2003-12-05 | 2005-06-30 | Nippon Telegr & Teleph Corp <Ntt> | Transmission mode selecting method |
| CN1665166A (en) * | 2004-03-05 | 2005-09-07 | 株式会社日立制作所 | Adaptive modulation scheme and data rate control method |
| JP2005260992A (en) * | 2001-12-26 | 2005-09-22 | Matsushita Electric Ind Co Ltd | Wireless communication apparatus and transmission rate decision method |
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2005
- 2005-09-30 CN CN201210001093.0A patent/CN102404080B/en active Active
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005260992A (en) * | 2001-12-26 | 2005-09-22 | Matsushita Electric Ind Co Ltd | Wireless communication apparatus and transmission rate decision method |
| WO2004012370A1 (en) * | 2002-07-29 | 2004-02-05 | Matsushita Electric Industrial Co., Ltd. | Radio device and base station device |
| JP2005175542A (en) * | 2003-12-05 | 2005-06-30 | Nippon Telegr & Teleph Corp <Ntt> | Transmission mode selecting method |
| CN1665166A (en) * | 2004-03-05 | 2005-09-07 | 株式会社日立制作所 | Adaptive modulation scheme and data rate control method |
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