CN102474340B - Method and device for relaying - Google Patents

Abstract

A method and device for relaying are provided. The method includes the following steps: the bit probability ratios of every encoded bit in the packets from multiple mobile terminals are softly combined to generate soft network encoding packet information; channel decoding is performed for the soft network encoding packet information to obtain network encoding packet; channel encoding and modulation are performed for the network encoding packet; the modulated network encoding packet is sent to base station. Application of the method and device can implement signal relaying with high resource utilization efficiency, and save nearly half operation complexity in relay device.

Description

Trunking method and equipment thereof

Technical field

The present invention relates to field of wireless transmission, particularly trunking method and equipment thereof.

Background technology

In LTE-Advanced, relaying is regarded as a kind of high power capacity and high important technology covering supported.In up link, trunking need to be multiple mobile terminals (UE) forwarding informations conventionally, is to forward with the method by UE in traditional trunking.In the time that served UE amount increases, in time division multiplexing (TDM) system, forward the delay that causes growing very much by UE, and in frequency division multiplexing (FDM) system, need more frequency resource for forwarding.

Meanwhile, for DF (decoding forward) relaying, need to grouping carry out by UE decode and recompile, channel decoder and channel encoder become the main complexity of trunk side.

Therefore need the more efficient relay forwarding mode of one, to overcome above-mentioned problem.

Summary of the invention

Embodiments of the present invention have proposed a kind of trunking method and equipment thereof.

According to the one side of embodiment of the present invention, a kind of trunking method is provided, comprising: the bit likelihood ratio to each coded-bit in the grouping from multiple mobile terminals carries out soft merging, produce soft network code grouping information; Described soft network code grouping information is carried out to channel-decoding, obtain network code grouping; Described network code grouping is carried out to Channel Coding and Modulation; Send the network code grouping after modulation to base station.

According to embodiment of the present invention on the other hand, a kind of repeating signal processing method has been proposed, comprise: to carrying out soft merging from multiple mobile terminals and from the first bit likelihood ratio of each coded-bit in the grouping of trunking, produce the second bit likelihood ratio of described each coded-bit from each mobile terminal in the grouping of multiple mobile terminals, wherein, the described grouping from trunking is that described trunking carries out soft merging to the grouping from described multiple mobile terminals and the network code grouping that obtains; Described the second bit likelihood ratio is carried out to channel-decoding, obtain from each grouping in described multiple mobile terminals.

According to embodiment of the present invention on the other hand, propose a kind of trunking, having comprised: merge cells, carry out soft merging for the bit likelihood ratio of each coded-bit of grouping to from multiple mobile terminals, produce soft network code grouping information; Decoding unit, for described soft network code grouping information is carried out to channel-decoding, obtains network code grouping; Coding unit, for carrying out chnnel coding to described network code grouping; Modulating unit, for modulating the described network code grouping after chnnel coding; The first transmitting element, for sending the network code grouping after modulation to base station.

According to embodiment of the present invention on the other hand, a kind of base station has been proposed, comprise: signal merge cells, for to carrying out soft merging from multiple mobile terminals and from the first bit likelihood ratio of each coded-bit of the grouping of trunking, produce the second bit likelihood ratio of described each coded-bit from each mobile terminal in the grouping of multiple mobile terminals, wherein, the described grouping from trunking is that described trunking carries out soft merging to the grouping from described multiple mobile terminals and the network code grouping that obtains; Channel-decoding unit, for described the second bit likelihood ratio is carried out to channel-decoding, obtains from each grouping in described multiple mobile terminals.

According to the one side again of embodiment of the present invention, a kind of communication system has been proposed, comprise above-described base station, relaying and multiple mobile terminal.

Based on above technical scheme, owing to sending two piece of data in a system resource, the raising of embodiments of the present invention the resource utilization of signal relaying.And on trunking, the reception signal after soft merging, only needs the channel-decoding of half, chnnel coding computing again.Because channel decoder and channel encoder are the main complexities of trunk side, the trunking method in the present invention, with respect to general decode-and-forward relay, can save nearly half computational complexity.

Brief description of the drawings

According to following description by reference to the accompanying drawings, advantage of the present invention will become easy to understand, wherein:

Fig. 1 shows communication system schematic diagram according to the embodiment of the present invention;

Fig. 2 shows according to the embodiment of the present invention, the block diagram of the trunking shown in Fig. 1;

Fig. 3 shows according to the embodiment of the present invention, the block diagram of the base station shown in Fig. 1;

Fig. 4 shows according to the embodiment of the present invention, the process chart of trunking side;

Fig. 5 shows according to the embodiment of the present invention, the process chart of base station side;

Fig. 6 shows the simplified diagram of flow chart shown in Fig. 5;

Fig. 7 shows the effect schematic diagram of trunking method according to the embodiment of the present invention.

Embodiment

To a preferred embodiment of the present invention will be described in detail, in description process, having omitted is unnecessary details and function for the present invention with reference to the accompanying drawings, obscures to prevent that the understanding of the present invention from causing.

In embodiments of the present invention, proposed a kind of wireless communication system, as shown in Figure 1, this system comprises trunking, base station and multiple mobile terminal (UE) of the following stated.

Also proposed a kind of trunking, as shown in Figure 2, this base station comprises merge cells 230, carries out soft merging for the bit likelihood ratio of each coded-bit of grouping to from multiple mobile terminals, produces soft network code grouping information; Decoding unit 240, for soft network code grouping information is carried out to channel-decoding, obtains network code grouping; Coding unit 260, for chnnel coding that network code is divided into groups to carry out; Modulating unit 270, modulates for the network code grouping to after chnnel coding; The first transmitting element 280, for sending the network code grouping after modulation to base station.

This trunking also comprises demodulating unit 220, carries out demodulation for the grouping to from multiple mobile terminals, obtains the bit likelihood ratio of each coded-bit described in each grouping.

This trunking also comprises control unit 250, for judging that whether the channel-decoding that soft network code grouping information is carried out is correct, if judged result is correct, control coding unit 260 re-starts chnnel coding to the soft network code grouping information after channel-decoding.

This trunking also comprises the first receiving element 210, for receiving packet signal from multiple mobile terminals.

A kind of base station has also been proposed, as shown in Figure 3, this base station comprises signal merge cells 230, for to carrying out soft merging from multiple mobile terminals and from the first bit likelihood ratio of each coded-bit of the grouping of trunking, produce the second bit likelihood ratio from each coded-bit of each mobile terminal in the grouping of multiple mobile terminals, wherein, be that trunking carries out soft merging to the grouping from multiple mobile terminals and the network code grouping that obtains from the grouping of trunking; Channel-decoding unit 240, for the second bit likelihood ratio is carried out to channel-decoding, obtains from each grouping in multiple mobile terminals.

This base station also comprises base station demodulating unit 220, for to carrying out demodulation from multiple mobile terminals and from the grouping of trunking, obtains the first bit likelihood ratio of each coded-bit of each grouping.

This base station also comprises the first receiving element 210, for receiving grouped data from multiple mobile terminals and trunking.

Although above with separate functional module formal description base station and the trunking of the embodiment of the present invention, but Fig. 2 can realize with multiple devices in actual applications to each assembly shown in Fig. 4, and the multiple assemblies that illustrate also can be integrated in chip piece or an equipment in actual applications.This base station and trunking also can comprise any unit and the device for other object.

Below in conjunction with Fig. 4 and Fig. 5, the base station that embodiments of the present invention are provided and the function of trunking are further elaborated.

Fig. 4 is the flow chart of trunking side trunking method.As shown in Figure 4, first, in step 410, the first receiving element 210 of trunking receives the grouping from multiple UE.Taking two UE as example, what trunking received is grouped into:

y _U1，R＝h _U1，R·s ₁+n _1，R (1)

y _U2，R＝h _U2，R·s ₂+n _2，R (2)

Wherein, S ₁and S ₂respectively the symbol that UE1 and UE2 send, h _{u1, R}and h _{u2, R}respectively UE1 and the UE2 fading channel model to trunking, n _{1, R}and n _{2, R}be independent identically distributed white Gaussian noise on these channels, its variance is σ ².

In step 420, the demodulating unit 220 of trunking carries out demodulation to the multiple groupings that receive respectively.

The the first symbol S sending with UE1 ₁for example, first, calculate S according to formula (3) ₁symbol likelihood ratio (LLRs):

$\mathrm{LLR}\left(s_1\right)=\log P\left(y_{U1,R}\right|s_{1i})=-\frac{{(y_{U1,R}-h_{U1,R}{s}_{1i})}^2}{2{\mathrm{\σ}}^2}---\left(3\right)$

Wherein, s _1iunder current modulation mode, symbol S ₁each probable value.For example, for QPSK, i=1～4.

Then, according to formula (4) compute sign S ₁in the bit likelihood ratio (LLRb) of j bit:

$\mathrm{LLR}\left(b_j\right)=\log \frac{P(b_j=1|y_{U1,R})}{P(b_j=0|y_{U1,R})}=\log \frac{\underset{s_i;b_j=1}{\mathrm{\Σ}}P\left(y_{U1,R}\right|s_i)}{\underset{s_k;b_j=0}{\mathrm{\Σ}}P\left(y_{U1,R}\right|s_k)}=\log \frac{\underset{s_i;b_j=1}{\mathrm{\Σ}}\exp \left(\mathrm{LLR}\left(s_i\right)\right)}{\underset{s_k;b_j=0}{\mathrm{\Σ}}\exp \left(\mathrm{LLR}\left(s_k\right)\right)}---\left(4\right)$

Wherein, j, k is the number of coded bits that each symbol may comprise, j, k=1 ..., log ₂(max (i)), concerning QPSK coding, j, k=1,2.

In like manner, the symbol receiving from UE2 is also done to identical processing.

In step 430, the likelihood ratio of the grouping of the merge cells 230 of trunking to the multiple UE that obtain after demodulation carries out soft merging, produces soft network code grouping information, to simulate the signal receiving is instead of P1 and P2.

Suppose that the grouping receiving is p so divides into groups _nCin a network code bit b _nCthere is possibility as shown in table 1, wherein, b ₁for grouping P ₁in a coded-bit, b2 be grouping P ₂in with b ₁corresponding coded-bit, network code refers to that the grouping to coming the multiple sources of automatic network encodes, network code bit refers to the bit after network code.

Table 1 receives the various probable values of bit

According to the definition of likelihood ratio, b _nClikelihood ratio as shown in formula (5), wherein, P1 and P2 are independently:

$\mathrm{LLR}\left(b_{\mathrm{NC}}\right)=\log \frac{P[b_{\mathrm{NC}}=1|y_1,y_2]}{P[b_{\mathrm{NC}}=0|y_1,y_2]}=\log \frac{P[b_1=0|y_1\left]P\right[b_2=1\left|y_2\right]+P[b_1=1|y_1\left]P\right[b_2=0\left|y_2\right]}{P[b_1=0|y_1\left]P\right[b_2=0\left|y_2\right]+P[b_1=1|y_1\left]P\right[b_2=1\left|y_2\right]}---\left(5\right)$

On molecule and denominator divided by P[b ₁=0|y ₁] P[b ₂=0|y ₂], obtain formula (6):

$\mathrm{LLR}\left(b_{\mathrm{NC}}\right)=\log \frac{\exp \left(\mathrm{LLR}\left(b_1\right)\right)+\exp \left(\mathrm{LLR}\left(b_2\right)\right)}{1+\exp (\mathrm{LLR}\left(b_1\right)+\mathrm{LLR}\left(b_2\right))}---\left(6\right)$

Can find out, by equation (6), can, in the time receiving P1, P2, know being grouped into of receiving by inference time bit likelihood ratio.In embodiments of the present invention, obtain respectively the bit likelihood ratio of P1 and P2 according to formula (3) and formula (4), built according to formula (6), just can obtain bit likelihood ratio to represent that is, formula (6) is applied to P1 and P2 by bit, the represented signal of bit likelihood ratio sequence producing is equivalent to

In this step, if the length of symbol is inconsistent, can fill complete zero or complete 1 to reach the length of long symbol at shorter symbol afterbody.

In step 440, the decoding unit 240 of trunking carries out channel-decoding to soft network code grouping information.

This step is to LLR (b _nC) carry out channel-decoding, as previously mentioned, the in the situation that of the correct reception of trunking, the decoded grouping obtaining should be

In step 450, the control unit 250 of trunking judges whether correctly to have carried out channel-decoding.

In this step, CRC check code can be used for judging that whether channel-decoding is correct.Because network code is linear operation, the CRC check position after network code still can be used for judgement decoding correctness.Certainly, it will be recognized by those skilled in the art that the CRC check code that judges that the whether correct mode of channel-decoding is not limited to use in present embodiment.

If channel-decoding is incorrect, in step 460, relaying is carried out in grouping channel-decoding being obtained according to conventional method, and for example, in AF (amplification forwarding) relaying, grouping P1 and P2 that channel-decoding is obtained amplify and forward.

If channel-decoding is correct, in step 470, the network code grouping that the coding unit 260 of trunking obtains decoding re-starts chnnel coding, and modulates by modulator 270 in step 480, in step 490, sends by the first transmitting element 280.

In above-mentioned technical scheme, those skilled in the art are known, and demodulating unit 220 and modulating unit 270 can be realized by monolithic chip, and decoding unit 240 and coding unit 260 also can be realized by monolithic chip.In step before step 490, can also comprise the step that the grouping to receiving is regenerated and/or amplified.

Fig. 5 is that base station side is for the flow chart of processing according to the packet signal of the method institute relaying of Fig. 4.The processing of base station side is described below by Fig. 5.

In step 510, the second receiving element 310 of base station receives respectively the signal from different UEs and trunking.As in the present embodiment, receive respectively from UE1 and UE2:

y _B，1＝h _B，1·s ₁+n _B，1 (6)

y _B，2＝h _B，2·s ₂+n _B，2 (7)

Receive from trunking:

y _R，B＝h _R，B·s ₃+n _R，B (8)

Wherein, S ₁, S ₂and S ₃respectively the symbol from UE1, UE2 and trunking transmission, h _{b, 1}, h _{b, 2}and h _{r, B}respectively UE1, UE2 and the trunking fading channel model to base station, n _{b, 1}, n _{b, 2}and n _{r, B}be respectively the independent identically distributed white Gaussian noise of introducing on these channels, its variance is σ ², and wherein, S ₃the S of trunking place ₁and S ₂carry out the corresponding modulating symbol in the soft merging network code grouping that also chnnel coding is modulated again.

In step 520, base station demodulating unit 320 is to grouping P1, the P2 and the P3 (S that receive from UE1, UE2 and trunking respectively ₁, S ₂and S ₃be respectively the exemplary symbol in P1, P2 and P3, P1, P2 and P3 all comprise a lot of transmission symbols) carry out demodulation operation as performed in the step 420 at trunking place, to obtain respectively the first coded-bit likelihood ratio LLR (b of P1, P2 and P3 ₁), LLR (b ₂) and LLR (b _nC) sequence.

In step 530, the signal combiner 330 of base station carries out soft merging to the likelihood ratio of obtained P1, P2 and P3.

With b in P1 ₁the second bit likelihood ratio be example, receiving respectively after the signal from UE1, UE2 and trunking, according to table 1, calculate as follows b in P1 ₁the second bit likelihood ratio

$L\tilde{L}R\left(b_1\right)=\log \frac{P\left[y_{\mathrm{NC}}\right|b_{\mathrm{NC}}=1]P(b_1=1)P(b_2=0)+P[y_{\mathrm{NC}}|b_{\mathrm{NC}}=0]P(b_1=1)P(b_2=1)}{P\left[y_{\mathrm{NC}}\right|b_{\mathrm{NC}}=0]P(b_1=0)P(b_2=0)+P[y_{\mathrm{NC}}|b_{\mathrm{NC}}=1]P(b_1=0)P(b_2=1)}---\left(9\right)$

Wherein, b ₁, b ₂and b _nCbe respectively an example bit in P1, P2 and P3, without loss of generality, can adopt the first coded-bit in grouping is example bit.

On the molecule of formula (9) and denominator simultaneously divided by P[y _nC| b _nC=0] P (b ₁=0) P (b ₂=0), obtain the likelihood ratio through soft merging:

$L\tilde{L}R\left(b_1\right)=\log \frac{\exp (\mathrm{LLR}\left(b_{\mathrm{NC}}\right)+L_a\left(b_1\right))+\exp (L_a\left(b_1\right)+L_a\left(b_2\right))}{1+\exp (\mathrm{LLR}\left(b_{\mathrm{NC}}\right)+L_a\left(b_2\right))}$

$=L_a\left(b_1\right)+\log \frac{\exp \left(\mathrm{LLR}\left(b_{\mathrm{NC}}\right)\right)+\exp \left(L_a\left(b_2\right)\right)}{1+\exp (\mathrm{LLR}\left(b_{\mathrm{NC}}\right)+L_a\left(b_2\right))}---\left(10\right)$

Wherein, LLR (b _nC) be P _nCmiddle b _nCthe first bit likelihood ratio, can in step 520, calculate, mean b _nprior information (in the present embodiment, n=1,2), if do not receive before this b _n, suppose that source has impartial probability, therefore, P (b _n=1)=P (b _n=0), L _a(b _n)=0.Owing to receiving b ₁and b ₂, the posterior probability LLR (b deriving before using ₁) and LLR (b ₂) replace this prior information.Therefore, become:

$L\tilde{L}R\left(b_1\right)=\mathrm{LLR}\left(b_1\right)+\log \frac{\exp \left(\mathrm{LLR}\left(b_{\mathrm{NC}}\right)\right)+\exp \left(\mathrm{LLR}\left(b_2\right)\right)}{1+\exp (\mathrm{LLR}\left(b_{\mathrm{NC}}\right)+\mathrm{LLR}\left(b_2\right))}---\left(11\right)$

According to log (e ^a+ e ^b) approximation theory of ≈ max (a, b), can carry out simplifying to reduce amount of calculation as follows to formula (11):

$L\tilde{L}R\left(b_1\right)\≈\mathrm{LLR}\left(b_1\right)+\max (\mathrm{LLR}\left(b_{\mathrm{NC}}\right),\mathrm{LLR}\left(b_2\right))-\max (0,\mathrm{LLR}\left(b_{\mathrm{NC}}\right)+\mathrm{LLR}\left(b_2\right))---\left(12\right)$

B in P2 ₂the second bit likelihood ratio also can produce by similar approach.

Subsequently, in step 540, in the signal of the channel decoder 340 of base station after to soft merging, the second bit likelihood ratio of each coded-bit carries out channel-decoding, obtains respectively each information bit in grouping P1 and grouping P2.

Fig. 6 shows the concise and to the point flow process of carrying out soft merging processing in base station side, and wherein, the processing of step 610 and step 620 is the processing to P3 in step 520, for for purpose of brevity, in Fig. 6, omitted the processing to P1 and P2, and step 630 and step 530 are identical, step 640 is identical with step 540.As shown in Figure 6, in order to use network code information to carry out soft merging, only need to increase a described extra preliminary treatment of equation (12), i.e. step 630 in Fig. 6, in the time adopting max-log-MAP algorithm (approximate data), this preliminary treatment has low-down complexity.

The technique effect of the technical scheme of next according to simulation result, embodiment of the present invention being set forth is set forth.In this emulation, suppose that channel is Rayleigh channel, Rayleigh fading there is unit variance, by white Gaussian noise is disturbed.UE1 and UE2 have identical channel status, link between trunking-base station has the identical channel status of link between UE-base station, link-quality between UE-trunking is better than the link-quality between UE-base station, it is the UMTS1/3Turbo code of 3456 bits that chnnel coding adopts length, and modulation type is QPSK.

Fig. 7 shows simulation result, and in Fig. 7, transverse axis is signal to noise ratio (E _b/ N ₀), the longitudinal axis is packet error rate (PER).As shown in Figure 7, along with improving of UE-repeated link, the technical scheme that embodiments of the present invention propose has gradually excellent performance with respect to non-relay mode, and this performance levels off to traditional X-ray OR network code relaying.The object of laying due to relaying is for improving community marginal user performance, and it is very common situations that UE-repeated link is better than the some dB of UE-base station link.Under these circumstances, can adopt in embodiments of the present invention and propose the alternative XOR relaying of soft network code relaying, reach XOR relaying performance, and further save computational complexity.And meanwhile, compared with traditional DF relaying, the technical scheme that embodiments of the present invention propose, owing to sending in the information originally sending in two parts of resources is incorporated in to a resource, has been saved 50% resource and transmitting power.And on relay station, because the soft network code information after soft merging only needs the channel-decoding of half, chnnel coding computing again, soft network code mode proposed by the invention can be saved the computational complexity of nearly half on relay station.

The technical scheme that embodiment of the present invention proposes is not subject to the restriction of wireless transmission method, no matter be frequency division, time-division, empty point or code point mode, its difference is only the resource difference that transmission is used, and those skilled in the art can be used for various wireless transmitting systems by embodiments of the present invention easily according to concrete wireless transmission method.

Although for simplicity, only used two mobile terminals in embodiments of the present invention, but those skilled in the art should recognize easily, use the mobile terminal of multiple two also can realize the technical scheme in embodiment of the present invention.In concrete realization, the UE1 in embodiment of the present invention and/or UE2 also can be substituted by one/two other relayings.

Those skilled in the art should be easy to recognize, can realize by programmed computer the different step of said method.At this, some execution modes comprise equally machine readable or computer-readable program storage device (as, digital data storage medium) and coding machine can carry out or the executable program command of computer, wherein, some or all steps of said method are carried out in this instruction.For example, program storage device can be digital storage, magnetic storage medium (as Disk and tape), hardware or the readable digital data storage medium of light.Execution mode comprises the programmed computer of the described step of carrying out said method equally.

Description and accompanying drawing only illustrate principle of the present invention.Therefore should be appreciated that those skilled in the art can advise different structures, although these different structures clearly do not describe herein or illustrate, within having embodied principle of the present invention and being included in its spirit and scope.In addition, all examples of herein mentioning are the main only design with help reader understanding's principle of the present invention and promotion this area that inventor was contributed for teaching purpose clearly, and should be interpreted as not being the restriction to these specific examples of mentioning and condition.In addition, all statement and specific examples thereof of mentioning principle of the present invention, aspect and execution mode comprise its equivalent interior herein.

Description is above only for realizing embodiments of the present invention; it should be appreciated by those skilled in the art; the any modification or partial replacement not departing from the scope of the present invention; all should belong to the scope that claim of the present invention limits; therefore, protection scope of the present invention should be as the criterion with the protection range of claims.

Claims (12)

1. a trunking method, comprising:

Bit likelihood ratio to each coded-bit in the grouping from multiple mobile terminals carries out soft merging, produces soft network code grouping information;

Described soft network code grouping information is carried out to channel-decoding, obtain network code grouping;

Described network code grouping is carried out to Channel Coding and Modulation; And

Send the network code grouping after modulation to base station.

2. trunking method according to claim 1, also comprises:

Grouping from multiple mobile terminals is carried out to demodulation, obtain the bit likelihood ratio of each coded-bit described in each grouping.

3. trunking method according to claim 2, wherein saidly the grouping from multiple mobile terminals is carried out to demodulation comprise:

Calculate each symbol likelihood ratio from each symbol of the grouping of described multiple mobile terminals;

Calculate the bit likelihood ratio of each coded-bit in described each symbol according to the symbol likelihood ratio of each calculated symbol.

4. trunking method according to claim 1, also comprises:

Judge that whether the channel-decoding that described soft network code grouping information is carried out is correct, if judged result is correct, the network code grouping obtaining after channel-decoding is carried out to chnnel coding, if judged result is incorrect, carry out amplification forwarding trunking plan.

5. a repeating signal processing method, comprising:

To carrying out soft merging from multiple mobile terminals and from the first bit likelihood ratio of each coded-bit in the grouping of trunking, produce the second bit likelihood ratio of described each coded-bit from each mobile terminal in the grouping of multiple mobile terminals, the wherein said grouping from trunking is that described trunking carries out soft merging to the grouping from described multiple mobile terminals and the network code grouping that obtains; And

Described the second bit likelihood ratio is carried out to channel-decoding, obtain from each grouping in described multiple mobile terminals.

6. repeating signal processing method according to claim 5, also comprises:

To carrying out demodulation from multiple mobile terminals and from the grouping of trunking, obtain the first bit likelihood ratio of described each coded-bit of each grouping.

7. a trunking, comprising:

Merge cells, carries out soft merging for the bit likelihood ratio of each coded-bit of grouping to from multiple mobile terminals, produces soft network code grouping information;

Decoding unit, for described soft network code grouping information is carried out to channel-decoding, obtains network code grouping;

Coding unit, for carrying out chnnel coding to described network code grouping;

Modulating unit, for modulating the described network code grouping after chnnel coding; And

The first transmitting element, for sending the network code grouping after modulation to base station.

8. trunking according to claim 7, also comprises demodulating unit, carries out demodulation for the grouping to from multiple mobile terminals, obtains the bit likelihood ratio of each coded-bit described in each grouping.

9. trunking according to claim 7, also comprises:

Control unit, whether correct for judging the channel-decoding that described soft network code grouping information is carried out, if judged result is correct, the soft network code grouping information of control coding unit after to channel-decoding re-starts chnnel coding.

10. a base station, comprising:

Signal merge cells, for to carrying out soft merging from multiple mobile terminals and from the first bit likelihood ratio of each coded-bit of the grouping of trunking, produce the second bit likelihood ratio of described each coded-bit from each mobile terminal in the grouping of multiple mobile terminals, the wherein said grouping from trunking is that described trunking carries out soft merging to the grouping from described multiple mobile terminals and the network code grouping that obtains; And

Channel-decoding unit, for described the second bit likelihood ratio is carried out to channel-decoding, obtains from each grouping in described multiple mobile terminals.

11. base stations according to claim 10, also comprise:

Base station demodulating unit, for to carrying out demodulation from multiple mobile terminals and from the grouping of trunking, obtains the first bit likelihood ratio of described each coded-bit of each grouping.

12. 1 kinds of communication systems, comprise according to the relaying described in any one in claim 7 to 9, according to the base station described in claim 10 or 11 and multiple mobile terminal.