CN101997593B - Self-adaption relay type preferential selecting method and relay node - Google Patents

Abstract

The invention discloses a self-adaption relay type preferential selecting method in wireless relay communication, aiming at improving the throughput of a relay link and reducing the processing time delay caused by the relay operation. According to the invention, a relay node self-adaptively regulates a relay mode and relays communication data and signaling in a relay manner according to the collected channel quality information. The self-adaption relay type preferential selecting method is suitable for various traditional relay communication systems. The invention discloses a relay node used for realizing the self-adaption relay type preferential selecting method.

Description

Self adaptation trunking scheme optimum selecting method and via node

Technical field

The present invention relates to the signal transmission optimization technology in wireless communication system, specifically a kind of self adaptation trunking scheme optimum selecting method being used in wireless relay communication system, to promote link throughput, reduces relay process time delay.In addition, the invention allows for a kind of via node, for realizing above-mentioned self adaptation trunking scheme optimum selecting method.

Background technology

Higher traffic rate and better signal covering quality are the basic demands of Next-Generation Wireless Communication Systems.Under traditional honeycomb single-hop mobile communication framework, capacity, improve the network coverage and can only complete by disposing base station.Yet the base station cost in cellular communication system is very high, and its addressing also has very high requirement, makes by increasing base station, to come elevator system service quality cost very high merely, is also difficult to achieve the goal.Than base station, the function of relay station is simpler, and transmitting power is lower, and is connected with base station by wireless mode, so cost is lower, disposes comparatively simple.As the effective means of lifting mobile capacity of communication system and service quality, trunking traffic technology has become the focus of domestic and international academia, industrial circle, is with a wide range of applications.

At present, 3GPP (3 ^rdgeneration Partnership Project, third generation partnership project) International Standards Organization just advances next generation mobile communication standard LTE-A (Long Term Evolution Advanced with meeting frequently with all strength, Long Term Evolution plan) the work of studying and defining, has discussed and has substantially determined most technological frame.Wherein, relaying technique has been determined the key technology that becomes LTE-A, with this, strengthen the covering of cell signals, improve the service quality of Cell Edge User, improve cell communication throughput (referring to document: 3GPP, R1-082024 " A Discussion On Some Technology Components ForLTE-Advanced ", Ericsson).Be different from the signal amplifier in traditional cellular communication system, the novel relaying technique in LTE-A can have higher level function, and it can be sampled to source signal, stores, even decoding, and then forwards.The signal that the no longer passive reception via node of subscriber equipment sends, but can select to take repeater mode or Straight transmission model according to its channel conditions, thereby the interference of having avoided traditional amplifier to introduce has brought space diversity, promotes link-quality.The level of the mobile communication hierarchy working according to operation of relays, 3GPP standardization body is divided into the relaying of L1～L3 different levels: L1 relaying is operated in physical layer, only can carry out the direct amplification of signal; L2 relaying is operated in MAC layer, can store signal, decoding forwards; L3 relaying is operated in higher level, has cell ID, Resource Block independently, can dispatch etc. function (referring to document: 3GPP, R1-082397 " Discussion On The Various Types Of Relays ", Panasonic).

Signal processing mode according to operation of relays to the source message receiving, 4 kinds of trunking schemes of main existence: (1) traditional signal directly amplifies mode, (2) amplification forwarding (Amplify andForward, AF), (3) decoding forwards (Decode and Forward, DF) and (4) coding cooperative, different pass-through modes needs the relaying of different levels, the also respectively corresponding performances such as different costs, complexity, time delay.Wherein, the traditional signal directly mode of amplifying can be operated in full duplex mode, equipment is simple, almost there is no signal lag, but adopt while forwarding in this way, because receiving terminal (subscriber equipment) can not be distinguished source signal and repeating signal, source signal will become the interference signal that receives signal (repeating signal), may cause efficiency lower; Three kinds of modes next are half-duplex mode, and via node is transmitted to subscriber equipment after receiving several time slots of source information frame again.In rear three kinds of modes, amplification forwarding AF mode is the simplest, and simple amplification after only need to sampling to source information frame, processes time delay less, but also the reception noise at via node place can be amplified in the process forwarding; Decoding forwards DF mode and has avoided this problem, but has introduced decoding delay, has increased complexity simultaneously, and may bring the error propagation of decoding; Coding cooperative refers to that via node carries out sending after recompile to it after receiving source signal, this mode has been brought extra coding gain, but need the subscriber equipment simultaneously can reception sources signal demodulation, and be not suitable for the poor Cell Edge User of the channel ratio that direct transfers.

In the nearest motion of 3GPP standardization body, substantially determine and adopt L3 relaying (renaming 1 Relay into Type), it can support above all 4 kinds of trunking schemes (referring to document: 3GPP, R1-091098 " WF On Relaying Operation For LTE-A ", CEWiT, Ericsson, Sharp and etc.).Which kind of but because various trunking schemes are good and bad at each tools of aspect of performance such as time delay, channel capacity and processing complexities, therefore, in academia, industrial circle, for concrete use trunking scheme, not yet reach an agreement.

After to existing literature search, find, in current trunking traffic technology, via node generally only adopts a kind of trunking scheme according to demand, for example, Huawei Company proposes to adopt traditional signal amplification mode to promote cell edge throughput (referring to document: 3GPP, R1-083711 " Cell EdgeThroughput Improvement with L1 Relay ", Huawei).LG company has proposed a kind of mixing AF-DF mode, reduced to a certain extent the time delay that DF mode is brought, but it requires that no matter via node adopts is AF or DF mode, all need source information to carry out decoding, and it is adaptively selected not utilize channel condition information to carry out, sacrificed link throughput performance (referring to document: 3GPP, R1-083657 " Hybrid of AF and DF in Layer-2 Relay ", LG).The give chapter and verse type of the Business Stream that via node serves of ZTE, select trunking scheme, but it does not consider the channel status of each subscriber equipment, may cause the loss of throughput of system (referring to document: 3GPP, R1-091439, " Approach for Selection RelayOperation Mode Based on User Traffic Types ", ZTE).

In following wide-band mobile communication, via node will have a plurality of radio-frequency modules and cover transmitted bandwidth, and can in frequency, distinguish transmitting of each subscriber equipment, thereby completely can be according to the demand for services of subscriber equipment and the residing channel status of via node, subscriber equipment and ability etc., the trunking scheme that configuration pin adopts the data flow of each subscriber equipment adaptively.Therefore, be necessary to find a kind of self adaptation trunking scheme optimum selecting scheme, on the basis of the very large complexity of unlikely increase, promote as much as possible link throughput, and reduce relay process time delay.

Summary of the invention

Above-mentioned deficiency based on prior art, the present invention proposes a kind of self adaptation trunking scheme optimum selecting method being used in wireless relay communication system, to promote the communication throughput of link, and reduces the processing time delay of introducing due to operation of relays.The present invention has advantages of high efficiency, low complex degree and is easy to realization, has very high using value in actual wireless relay communication system.

According to the first scheme of the present invention, a kind of trunking scheme system of selection has been proposed, comprising: demodulation is from the initiation of communication message of source node, and according to initiation of communication message, measure the channel quality information of the source-trunk channel from source node to via node; After initiation of communication message sink completes, initiation of communication message is forwarded to destination node; According to the channel quality information of the source-trunk channel measuring and the channel quality information of relaying-object channel being fed back by destination node and the channel quality information of source-object channel, select trunking scheme; And the channel quality information of source-trunk channel, relaying-object channel and source-object channel is sent to source node with together with selected trunking scheme.

Preferably, described trunking scheme system of selection also comprises: according to selected trunking scheme, the transmission data from source node are processed, and be forwarded to destination node; When receiving the channel quality information of relaying-object channel of destination node periodic feedback and the channel quality information of source-object channel, according to the channel quality information of the source-trunk channel measuring with by the channel quality information of relaying-object channel and the channel quality information of source-object channel of the up-to-date feedback of destination node, redefine trunking scheme; If new definite trunking scheme is identical with the trunking scheme of using at present, still continues to use the trunking scheme of using at present, and do not carry out more changed handling of trunking scheme; And if new definite trunking scheme is different from the trunking scheme of using at present, newly definite trunking scheme is changed to message by trunking scheme and inform source node, and when source node returns to change acknowledge message, the trunking scheme of using is at present changed to new definite trunking scheme.

Preferably, for redefining the channel quality information of the source-trunk channel of trunking scheme, be according to initiation of communication message, to measure at first, or according to transmission data again or periodic measurement obtain.

Preferably, selecting trunking scheme and/or redefining in the step of trunking scheme, also, according to the demand for services of destination node and the trunking scheme of supporting, selecting trunking scheme and/or redefine trunking scheme.

According to alternative plan of the present invention, a kind of trunking scheme system of selection has been proposed, comprising: according to the trunking scheme of using at present, the transmission data from source node are processed, and be forwarded to destination node; When receiving the channel quality information of relaying-object channel of destination node periodic feedback and the channel quality information of source-object channel, according to the channel quality information of source-trunk channel with by the channel quality information of relaying-object channel and the channel quality information of source-object channel of the up-to-date feedback of destination node, determine new trunking scheme; And if determined new trunking scheme is different from the trunking scheme of using at present, determined new trunking scheme is changed to message by trunking scheme and inform source node, and when source node returns to change acknowledge message, the trunking scheme of using is at present changed to determined new trunking scheme.

Preferably, described trunking scheme system of selection also comprises: if determined new trunking scheme is identical with the trunking scheme of using at present, still continues to use the trunking scheme of using at present, and do not carry out more changed handling of trunking scheme.

Preferably, for determining that the channel quality information of the source-trunk channel of new trunking scheme is at first to measure according to initiation of communication message, or according to transmitting data again or periodic measurement obtains.

Preferably, in determining the step of new trunking scheme, also, according to the demand for services of destination node and the trunking scheme of supporting, determine new trunking scheme.

In the first and second schemes of the present invention, the channel quality information of the channel quality information of source-trunk channel, relaying-object channel and the channel quality information of source-object channel are respectively the receiving terminal received signal to noise ratio SNR of source-trunk channel _sr, relaying-object channel receiving terminal received signal to noise ratio SNR _rdand the receiving terminal received signal to noise ratio SNR of source-object channel _sd.

Preferably, if (1+SNR _l1) ²>=1+SNR _aF, select and/or definite L1 directly amplifies mode; Otherwise, select and/or definite amplification forwarding mode, wherein

${\mathrm{<figure-callout\; id="1"\; label="SNR\; L"\; filenames="H2009101664422E00022.png,H2009101664422E00031.png"\; state="\{\{state\}\}">SNR</figure-callout>}}_L=\frac{1}{\frac{1}{{\mathrm{SNR}}_{\mathrm{sr}}}+\frac{1}{{\mathrm{SNR}}_{\mathrm{rd}}}+\frac{{\mathrm{SNR}}_{\mathrm{sd}}}{{\mathrm{SNR}}_{\mathrm{rd}}}(1+\frac{1}{{\mathrm{SNR}}_{\mathrm{sr}}})},$

${\mathrm{SNR}}_{\mathrm{AF}}=\frac{1}{\frac{1}{{\mathrm{SNR}}_{\mathrm{sr}}}+\frac{1}{{\mathrm{SNR}}_{\mathrm{rd}}}}.$

Preferably, if (1+SNR _l1) ²>=1+SNR _dF, select and/or definite L1 directly amplifies mode; Otherwise, select and/or definite decoding pass-through mode, wherein

${\mathrm{<figure-callout\; id="1"\; label="SNR\; L"\; filenames="H2009101664422E00022.png,H2009101664422E00031.png"\; state="\{\{state\}\}">SNR</figure-callout>}}_L=\frac{1}{\frac{1}{{\mathrm{SNR}}_{\mathrm{sr}}}+\frac{1}{{\mathrm{SNR}}_{\mathrm{rd}}}+\frac{{\mathrm{SNR}}_{\mathrm{sd}}}{{\mathrm{SNR}}_{\mathrm{rd}}}(1+\frac{1}{{\mathrm{SNR}}_{\mathrm{sr}}})},$

SNR _DF＝min{SNR _sr，SNR _rd}。

Preferably, if SNR _aF>=SNR _req, select and/or definite amplification forwarding mode; Otherwise, select and/or definite decoding pass-through mode, wherein SNR _reqbe according to current adopted coding and modulation system, can reach the minimum received signal to noise ratio of desired decoding accuracy rate.

According to third party's case of the present invention, a kind of via node has been proposed, comprising: R-T unit, for from and/or to source node, receive and/or send data message, and from and/or to destination node, receive and/or send data message, demodulator, for demodulation, by described R-T unit, receive, from the initiation of communication message of source node, source-trunk channel apparatus for measuring quality, for measuring the channel quality information of the source-trunk channel from source node to via node, and trunking scheme choice device, for according to the channel quality information of source-trunk channel of measuring with receive by described R-T unit, the channel quality information of the relaying-object channel being fed back by destination node and the channel quality information of source-object channel, select trunking scheme, wherein after initiation of communication message sink completes, by described R-T unit, initiation of communication message is forwarded to destination node, and by described R-T unit, by source-trunk channel, the channel quality information of relaying-object channel and source-object channel sends to source node together with selected trunking scheme.

Preferably, described via node also comprises: transmission data processing equipment, be used for according to selected trunking scheme, to what receive by described R-T unit, transmission data from source node are processed, and by described R-T unit, be forwarded to destination node, while wherein receiving the channel quality information of relaying-object channel of destination node periodic feedback and the channel quality information of source-object channel by described R-T unit at described trunking scheme choice device, according to the channel quality information of the source-trunk channel measuring with by the channel quality information of relaying-object channel and the channel quality information of source-object channel of the up-to-date feedback of destination node, redefine trunking scheme, if new definite trunking scheme is identical with the trunking scheme of using at present, still continue to use the trunking scheme of using at present, and described trunking scheme choice device is not carried out more changed handling of trunking scheme, if and new definite trunking scheme is different from the trunking scheme of using at present, described trunking scheme choice device is by described R-T unit, newly definite trunking scheme is changed to message by trunking scheme and inform source node, and when receiving by described R-T unit the change acknowledge message of returning from source node, the trunking scheme of using is at present changed to new definite trunking scheme.

Preferably, for redefining the channel quality information of source-trunk channel of trunking scheme, by described source-trunk channel apparatus for measuring quality, according to initiation of communication message, measured at first, or by described source-trunk channel apparatus for measuring quality according to transmission data again or periodic measurement obtain.

Preferably, described trunking scheme choice device also, according to the demand for services of destination node and the trunking scheme of supporting, is selected trunking scheme and/or redefines trunking scheme.

According to cubic case of the present invention, a kind of via node has been proposed, comprising: R-T unit, for from and/or to source node, receive and/or send data message, and from and/or to destination node, receive and/or send data message, transmission data processing equipment, for according to the trunking scheme of using at present, to by described R-T unit, receive, from the transmission data of source node, process, and by described R-T unit, be forwarded to destination node, source-trunk channel apparatus for measuring quality, for measuring the channel quality information of the source-trunk channel from source node to via node, and trunking scheme choice device, for when receiving the channel quality information of relaying-object channel of destination node periodic feedback and the channel quality information of source-object channel by described R-T unit, according to the channel quality information of source-trunk channel with by the channel quality information of relaying-object channel and the channel quality information of source-object channel of the up-to-date feedback of destination node, determine new trunking scheme, if wherein determined new trunking scheme is different from the trunking scheme of using at present, described trunking scheme choice device is by described R-T unit, determined new trunking scheme is changed to message by trunking scheme and inform source node, and when receiving by described R-T unit the change acknowledge message of returning from source node, the trunking scheme of using is at present changed to determined new trunking scheme.

Preferably, if determined new trunking scheme is identical with the trunking scheme of using at present, still continue to use the trunking scheme of using at present, and described trunking scheme choice device is not carried out more changed handling of trunking scheme.

Preferably, for determining that the channel quality information of the source-trunk channel of new trunking scheme is measured according to initiation of communication message at first by described source-trunk channel apparatus for measuring quality, or by described source-trunk channel apparatus for measuring quality according to transmission data again or periodic measurement obtain.

Preferably, described trunking scheme choice device also, according to the demand for services of destination node and the trunking scheme of supporting, is determined new trunking scheme.

In the third and fourth scheme of the present invention, the channel quality information of the channel quality information of source-trunk channel, relaying-object channel and the channel quality information of source-object channel are respectively the receiving terminal received signal to noise ratio SNR of source-trunk channel _sr, relaying-object channel receiving terminal received signal to noise ratio SNR _rdand the receiving terminal received signal to noise ratio SNR of source-object channel _sd.

Preferably, if (1+SNR _l1) ²>=1+SNR _aF, described trunking scheme choice device is selected and/or is determined that L1 directly amplifies mode; Otherwise described trunking scheme choice device is selected and/or is determined amplification forwarding mode, wherein

${\mathrm{<figure-callout\; id="1"\; label="SNR\; L"\; filenames="H2009101664422E00022.png,H2009101664422E00031.png"\; state="\{\{state\}\}">SNR</figure-callout>}}_L=\frac{1}{\frac{1}{{\mathrm{SNR}}_{\mathrm{sr}}}+\frac{1}{{\mathrm{SNR}}_{\mathrm{rd}}}+\frac{{\mathrm{SNR}}_{\mathrm{sd}}}{{\mathrm{SNR}}_{\mathrm{rd}}}(1+\frac{1}{{\mathrm{SNR}}_{\mathrm{sr}}})},$

${\mathrm{SNR}}_{\mathrm{AF}}=\frac{1}{\frac{1}{{\mathrm{SNR}}_{\mathrm{sr}}}+\frac{1}{{\mathrm{SNR}}_{\mathrm{rd}}}}.$

Preferably, if (1+SNR _l1) ²>=1+SNR _dF, described trunking scheme choice device is selected and/or is determined that L1 directly amplifies mode; Otherwise described trunking scheme choice device is selected and/or is determined decoding pass-through mode, wherein

${\mathrm{<figure-callout\; id="1"\; label="SNR\; L"\; filenames="H2009101664422E00022.png,H2009101664422E00031.png"\; state="\{\{state\}\}">SNR</figure-callout>}}_L=\frac{1}{\frac{1}{{\mathrm{SNR}}_{\mathrm{sr}}}+\frac{1}{{\mathrm{SNR}}_{\mathrm{rd}}}+\frac{{\mathrm{SNR}}_{\mathrm{sd}}}{{\mathrm{SNR}}_{\mathrm{rd}}}(1+\frac{1}{{\mathrm{SNR}}_{\mathrm{sr}}})},$

SNR _DF＝min{SNR _sr，SNR _rd}。

Preferably, if SNR _aF>=SNR _req, described trunking scheme choice device is selected and/or is determined amplification forwarding mode; Otherwise described trunking scheme choice device is selected and/or is determined decoding pass-through mode, wherein SNR _reqbe according to current adopted coding and modulation system, can reach the minimum received signal to noise ratio of desired decoding accuracy rate.

According to the specific embodiment of the present invention, operation of relays can be divided into two stages: initiation of communication stage and data transfer phase.But it should be noted in the discussion above that the present invention is not limited to this two stages, also can, in performing data transmission, carry out the present invention, and not carry out the initial initiation of communication stage.

First stage is the initiation of communication stage, and main being responsible for communicates to connect foundation, mainly comprises the following steps:

Step S11: source node sends initiation of communication message to via node.

Step S12: via node demodulation initiation of communication message, and measure the SNR of the SR channel from source node to via node with this; After initiation of communication message sink completes, be forwarded to destination node.

Step S13: destination node demodulation is from the initiation of communication message of via node, and measure the SNR of the RD channel from via node to destination node with this, before this, simultaneously or after this, destination node is also measured from source node directly to the SNR of the SD channel of destination node; After initiation of communication message sink completes, the SNR of the SNR of the RD channel measuring and SD channel is fed back to via node.

Step S14: via node is in conjunction with the channel quality information of SR, RD and SD channel, selects trunking scheme, and the channel quality information of SR, RD and SD channel is sent to source node with together with selected trunking scheme.

Step S15: source node, according to the trunking scheme of via node feedback, is selected coding and the modulation system of transmission data, and communication connection is set up complete, enters data transfer phase.

So far, the connection establishment stage of trunking traffic finishes.

Second stage is data transfer phase, and each node operates as follows:

Source node: according to the selected trunking scheme of current via node, select corresponding coding and modulation system to send data.Monitor the feedback information from via node simultaneously, if receive the NACK feedback information from via node, return to step S11 and re-establish connection; If receive the trunking scheme change message from via node,, according to the trunking scheme of notifying in trunking scheme change message, reselect corresponding coding and modulation system (change send mode), and postback change acknowledge message.

Via node: according to selected trunking scheme, process, send the source signal receiving from source node, meanwhile, forward the ACK/NACK message from destination node.When the channel quality information feedback listening to from destination node, the channel quality information according to current, redefines trunking scheme, if new definite trunking scheme is identical with the current trunking scheme of using, does not carry out any processing; On the other hand, if new definite trunking scheme is different from the trunking scheme of using at present, newly definite trunking scheme is changed to message by trunking scheme and inform source node, after source node returns to change acknowledge message, the trunking scheme of using is at present changed to new definite trunking scheme.

Destination node: receive the Frame from via node, postback ACK message if successfully decoded, otherwise postback NACK message; And feed back at a certain time interval the channel quality information of RD channel and SD channel.

In implementation process of the present invention, destination node does not need to know the existence of via node, goes for transparent trunking scheme; In addition, SD channel and the RD channel SNR information of the SNR of the SR channel that via node can measure according to it and destination node feedback independently are selected trunking scheme, and do not need with source node alternately, so have reduced signaling consumption, have reduced complexity.The self adaptation trunking scheme optimum selecting method that the present invention proposes, can effectively promote the throughput of communication link, reduce the processing time delay of operation of relays, and complexity is low, in being provided with the cordless communication network of via node (relay station), 3GPP LTE-A, WiMAX etc. are with a wide range of applications.

Accompanying drawing explanation

Below by accompanying drawings embodiments of the invention, by foregoing of the present invention and the more clear statement of other objects, features and advantages, wherein:

Fig. 1 shows the schematic diagram of the cellular communication system that is provided with via node;

Fig. 2 is for the schematic diagram of the various channels that trunking traffic is related is described;

Fig. 3 shows the transfer of data sequential chart of the mode of direct transferring;

Fig. 4 shows L1 relay data transmission time sequence figure;

Fig. 5 shows amplification forwarding (AF) relay data transmission time sequence figure;

Fig. 6 shows decoding and forwards (DF) relay data transmission time sequence figure;

Fig. 7 shows the state diagram that adopts wireless relay communication system of the present invention;

Fig. 8 shows the connection building process that adopts wireless relay communication system of the present invention; And

Fig. 9 shows the schematic block diagram of via node 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, to prevent that the understanding of the present invention from causing, obscures.

For clear, at length set forth performing step of the present invention, provide some specific embodiments of the invention below, be applicable to 3GPP LTE-A wireless communication system.It should be noted that, the invention is not restricted to the application described in embodiment, but applicable to other wireless communication systems that are provided with via node (relay station).

Fig. 1 shows the schematic diagram of the cellular communication system that is provided with via node.In the cellular communication system shown in Fig. 1, the shadow effect (as user 1 and user 3) of blocking due to path fading or building, may cause the channel quality that direct transfers of user terminal to base station very poor, therefore the covering that some relay stations (relay station 1 and relay station 2) improve signal need to be set in community.With respect to increase base station, improve the method for signal covering, capacity, arranging of relay station is convenient, and cost is lower, and user terminal can be selected trunk channel and the better person who direct transfers in channel, thereby brought space diversity (as user 2), promoted communication reliability.Therefore, 3GPP, when formulating next generation mobile communication standard LTE-A, brings relaying technique in core frame into.

Fig. 2 is for the schematic diagram of the various channels that trunking traffic is related, wherein h are described _sr, h _sd, h _rdrepresent that respectively source node arrives the channel coefficients of destination node to via node, source node to destination node and via node.Because source node S is stopped by barrier between the distant of destination node D or the two, the channel SD channel quality that causes direct transferring very poor (representing with " X " in Fig. 2), must complete data communication by trunk channel SR and RD.The present embodiment is mainly considered downlink data transmission, and up link is only responsible for the feedback of the signalings such as CQI, ACK.

The present invention is defined as the time difference the initial time that sends Frame from source node receives this Frame completely termination constantly to destination node by time delay.In trunking traffic, total time delay mainly comprises two parts: processing time delay and the transmission delay of operation of relays.

Fig. 3 shows the relay data transmission time sequence figure of the mode of direct transferring, and this kind of mode do not have via node, therefore there is no the processing time delay of operation of relays.In this example, setting frame length is 1ms, and the transmission delay of Frame is 1ms.After complete receiving data frames, destination node is carried out decoding to receiving data, confirms that decoding sends ack signal to source node by feedback link after errorless.In this example, decode procedure needs 3ms.

Fig. 4 shows the transfer of data sequential chart that L1 directly amplifies trunking scheme.This kind of trunking scheme is full duplex mode, only need be operated in L1 physical layer.Via node, after the signal receiving from source node, is not done after any processing is only amplified directly to send, and conventionally, its relay process time delay can be ignored.If the normalized signal vector that source node sends is x _s, transmitting power is P _s, the signal y that via node receives _rfor:

$y_r=\sqrt{P_s}{h}_{\mathrm{sr}}{x}_s+n_r---\left(1\right)$

$x_r=\frac{y_r}{\sqrt{P_s{G}_{\mathrm{sr}}+{\mathrm{\&sigma;}}_r^2}}---\left(2\right)$

N wherein _rfor receiving noise, its variance is σ _r ², G _srfor the channel gain of SR channel, x _rfor the relay reception vector after normalization.When receiving signal, via node by radio circuit by signal directly with power P _ramplify and send.Due to the broadcast characteristic of wireless channel, destination node will receive from the transmitting of source node and via node simultaneously, but source signal and repeating signal exist the regular hour poor, and therefore, now source signal becomes the interference x ' of repeating signal _s, the reception vector y of destination node _dcan be expressed as:

$y_d=h_{\mathrm{rd}}\sqrt{P_r}{x}_r+h_{\mathrm{sd}}\sqrt{P_s}{x^{\&prime;}}_s+n_d$

$=\sqrt{\frac{P_r{P}_s}{P_s{G}_{\mathrm{sr}}+{\mathrm{\&sigma;}}_r^2}}{h}_{\mathrm{sr}}{h}_{\mathrm{rd}}{x}_s+h_{\mathrm{sd}}\sqrt{P_s}{x^{\&prime;}}_s+\sqrt{\frac{P_r}{P_s{G}_{\mathrm{sr}}+{\mathrm{\&sigma;}}_r^2}}{h}_{\mathrm{rd}}{n}_r+n_d---\left(3\right)$

N wherein _dfor destination node receives noise, its variance is σ _d ².By formula (3), can be extrapolated the equivalent periodic line signal to noise ratio snr of L1 mode _l1for:

${\mathrm{<figure-callout\; id="1"\; label="SNR\; L"\; filenames="H2009101664422E00022.png,H2009101664422E00031.png"\; state="\{\{state\}\}">SNR</figure-callout>}}_L=\frac{1}{\frac{1}{{\mathrm{SNR}}_{\mathrm{sr}}}+\frac{1}{{\mathrm{SNR}}_{\mathrm{rd}}}+\frac{{\mathrm{SNR}}_{\mathrm{sd}}}{{\mathrm{SNR}}_{\mathrm{rd}}}(1+\frac{1}{{\mathrm{SNR}}_{\mathrm{sr}}})}---\left(4\right)$

SNR wherein _sr, SNR _rd, SNR _sdthe received signal to noise ratio that represents respectively SR channel, RD channel, SD channel receiving terminal, is defined as follows respectively:

${\mathrm{SNR}}_{\mathrm{sr}}=\frac{P_s{G}_{\mathrm{sr}}}{{\mathrm{\&sigma;}}_r^2}---\left(5\right)$

${\mathrm{SNR}}_{\mathrm{sd}}=\frac{P_s{G}_{\mathrm{sd}}}{{\mathrm{\&sigma;}}_d^2}---\left(6\right)$

${\mathrm{SNR}}_{\mathrm{rd}}=\frac{P_r{G}_{\mathrm{rd}}}{{\mathrm{\&sigma;}}_d^2}---\left(7\right)$

Wherein, G _sdfor the channel gain of SD channel, and G _rdchannel gain for RD channel.

Because L1 relaying is full-duplex mode, so the link channel capacity of which is:

R _L1＝log ₂(1+SNR _L1) (8)

Fig. 5 shows the transfer of data sequential chart that adopts amplification forwarding (AF) mode.This kind of mode is half-duplex mode, and via node just starts forwarding data after receiving source data frame completely; Via node need to first be stored source data frame, then by its amplification forwarding, conventionally, via node will be introduced the processing time delay of at least one frame length (being 1ms in this example).More than AF mode must operate at L2 layer, owing to being half-duplex mode, source signal is from repeating signal in different time slot transmittings, and destination node can be selected only when via node transmits, to receive, and receives signal y _dcan be expressed as:

$y_d=h_{\mathrm{rd}}\sqrt{P_r}{x}_r+n_d$

$=\sqrt{\frac{P_r{P}_s}{P_s{G}_{\mathrm{sr}}+{\mathrm{\&sigma;}}_r^2}}{h}_{\mathrm{sr}}{h}_{\mathrm{rd}}{x}_s+\sqrt{\frac{P_r}{P_s{G}_{\mathrm{sr}}+{\mathrm{\&sigma;}}_r^2}}{h}_{\mathrm{rd}}{n}_r+n_d---\left(9\right)$

And can release thus the received signal to noise ratio SNR of destination node _aF:

${\mathrm{SNR}}_{\mathrm{AF}}=\frac{1}{\frac{1}{{\mathrm{SNR}}_{\mathrm{sr}}}+\frac{1}{{\mathrm{SNR}}_{\mathrm{rd}}}}---\left(10\right)$

Because it is operated in semiduplex mode, so the link channel capacity of which is:

$R_{\mathrm{AF}}=\frac{1}{2}{\log }_2(1+{\mathrm{SNR}}_{\mathrm{AF}})---\left(11\right)$

Fig. 6 shows the transfer of data sequential chart that adopts decoding to forward (DF) mode.This trunking scheme is also half-duplex mode, different from AF mode is that via node is after receiving source signal, first attempt carrying out source signal decoding, and then forward, therefore have extra decoding delay (being 3ms in this example), conventionally, relaying time delay is four frame lengths (being 4ms in this example).The link channel capacity of DF mode is confined to the smaller in the SNR of SR and RD channel, can be written as:

$R_{\mathrm{DF}}=\frac{1}{2}{\log }_2(1+\min \{{\mathrm{SNR}}_{\mathrm{sr}},{\mathrm{SNR}}_{\mathrm{rd}}\left\}\right)---\left(12\right)$

Fig. 7 shows the state diagram that adopts wireless relay communication system of the present invention.In the initiation of communication stage, connection enters data transfer phase after setting up; At data transfer phase, relaying is selected trunking scheme adaptively according to channel feedback information, and the sign off until transfer of data is complete, or receive after NACK returns to the initiation of communication stage to re-establish connection.

Fig. 8 shows the connection process of establishing in initiation of communication stage, and concrete steps are as follows:

Step S11: source node S sends initiation of communication message to via node R.

Step S12: via node R demodulation initiation of communication message, and measure the SNR of the SR channel from source node S to via node R with this; After initiation of communication message sink completes, be forwarded to destination node D.

Step S13: destination node D demodulation is from the initiation of communication message of via node R, and measure the SNR of the RD channel from relaying node R to destination node D with this, before this, simultaneously or after this, destination node D also measures from source node S directly to the SNR of the SD channel of destination node D; After initiation of communication message sink completes, the SNR of the SNR of the RD channel measuring and SD channel is fed back to via node.

Step S14: via node R, in conjunction with the SNR of SR, RD and SD channel, considers the requirement of communication service to speed, time delay simultaneously, selects trunking scheme.

For example: if select the adaptive mode of L1 and DF, while turning to optimization object with link capacity maximum, as (1+SNR _l1) ²>=1+SNR _dFtime, select L1 directly to amplify mode; Otherwise, select DF mode, wherein SNR _dF=min{SNR _sr, SNR _rd.

For example: if select the adaptive mode of L1 and AF, while turning to optimization object with link capacity maximum, as (1+SNR _l1) ²>=1+SNR _aFtime, select L1 directly to amplify mode; Otherwise, select AF mode.

For example: if select the adaptive mode of AF and DF, in order to reduce decoding burden, processing time delay and the complexity of relaying, can be according to SNR _aF, SNR _dFand SNR _reqbetween magnitude relationship select trunking scheme, as follows: if SNR _aF>=SNR _req, AF mode can reach the decoding accuracy rate requirement of destination node D in current channel and coded modulation situation, selects AF mode; Otherwise select DF mode.SNR wherein _reqin current adopted coding and modulation system situation, for reaching the decoding accuracy rate of system, needed received signal to noise ratio.

Via node R is after determining trunking scheme, by SNR _sr, SNR _sd, SNR _rdsend to source node S with together with selected trunking scheme.

Step S15: source node S, according to the SNR information of via node R feedback, is selected coding and the modulation system of transmission data, and communication connection is set up complete, enters data transfer phase.

At data transfer phase, each node operates as follows:

Source node S:

If adopt L1 mode relaying, send continuously data;

If adopt AF or DF mode, interval one frame after every transmission one frame data.Monitor the feedback information from via node R simultaneously, if receive the NACK feedback information from via node R, return to the initiation of communication stage to re-establish connection; If receive the trunking scheme change message from via node R,, according to the trunking scheme of notifying in trunking scheme change message, reselect corresponding coding and modulation system (change send mode), and postback change acknowledge message.

Via node R:

If adopt L1 mode, receive from directly amplifying and send after the source signal of source node S;

If adopt AF mode, receive from first storage after the source signal of source node S until a frame forwards after receiving completely again;

If adopt DF mode, in reception, from the source signal of source node S and after completing decoding, forward again.

Meanwhile, via node R forwards the ACK/NACK message from destination node.If receive the SNR information feedback of destination node D, according to the method in step S14, redefine trunking scheme, if new definite trunking scheme is identical with the trunking scheme of using at present, via node R does not carry out any processing; On the other hand, if new definite trunking scheme is different from the trunking scheme of using at present, newly definite trunking scheme is changed to message by trunking scheme and inform source node S, after source node returns to change acknowledge message, the trunking scheme of using is at present changed to new definite trunking scheme.

Destination node D: receive the Frame from via node R, postback ACK message if successfully decoded, otherwise postback NACK message; And feed back at a certain time interval SNR _sd, SNR _rdchannel quality information.

Fig. 9 shows the schematic block diagram of via node 900 of the present invention.As shown in Figure 9, via node 900 according to the present invention comprises: trunking scheme selected cell 910, demodulator 915, memory 920, source-trunk channel SNR measuring unit 925, decoder 930, amplifier 940, selector switch 950 and 960, Transmit-Receive Unit (not shown).

Transmit-Receive Unit for from and/or to source node S, receive and/or send data message, and from and/or to destination node D, receive and/or send data message.

Demodulator 915 is that receive by Transmit-Receive Unit for demodulation, from initiation of communication message and the transmission data of source node S.

Memory 920 is for storing the initiation of communication message from source node S and the transmission data by demodulator 915 demodulation.

Source-trunk channel SNR measurement mechanism 925 is for measuring the receiving terminal received signal to noise ratio SNR of the RS channel from source node S to via node R _sr.According to the difference of scheme, source-trunk channel SNR measurement mechanism 925 can be measured SNR according to initiation of communication message and/or transmission data _sr.

Decoder 930, for when DF mode is selected, carries out decoding to the source signal being stored in memory 920.

Amplifier 940 is for amplifying input signal, and the signal after amplifying is transmitted to destination node D by Transmit-Receive Unit, input signal be directly from the signal of source node S, be stored in one of source signal in memory 920 and signal of decoder 930 outputs.

Trunking scheme selected cell 910 is in conjunction with SNR _srreceiving terminal received signal to noise ratio SNR with the RD channel receiving by Transmit-Receive Unit, fed back by destination node D _rdreceiving terminal received signal to noise ratio SNR with SD channel _sd, consider the requirement of communication service to speed, time delay simultaneously, determine trunking scheme, and by controlling selector switch 950 and 960, realize determined trunking scheme.

For example: if select the adaptive mode of L1 and DF, while turning to optimization object with link capacity maximum, as (1+SNR _l1) ²>=1+SNR _dFtime, select L1 directly to amplify mode; Otherwise, select DF mode, wherein SNR _dF=min{SNR _sr, SNR _rd.

For example: if select the adaptive mode of L1 and AF, while turning to optimization object with link capacity maximum, as (1+SNR _l1) ²>=1+SNR _aFtime, select L1 directly to amplify mode; Otherwise, select AF mode.

For example: if select the adaptive mode of AF and DF, in order to reduce decoding burden, processing time delay and the complexity of relaying, can be according to SNR _aF, SNR _dFand SNR _reqbetween magnitude relationship select trunking scheme, as follows: if SNR _aF>=SNR _req, AF mode can reach the decoding accuracy rate requirement of destination node D in current channel and coded modulation situation, selects AF mode; Otherwise select DF mode.SNR wherein _reqin current adopted coding and modulation system situation, for reaching the decoding accuracy rate of system, needed received signal to noise ratio.

At trunking scheme selected cell 910, determine after trunking scheme, by Transmit-Receive Unit, by SNR _sr, SNR _sd, SNR _rdsend to source node S with together with selected trunking scheme.

If adopt L1 mode, receive from directly amplifying and send by amplifier 940 after the source signal of source node S;

If adopt AF mode, receive after the source signal from source node S, first by demodulator 915 demodulation and store in memory 920, until after a frame receives completely, then via amplifier 940 amplification forwardings;

If adopt DF mode, after the source signal receiving from source node S, first by demodulator 915 demodulation and store in memory 920, until a frame receives completely, then completes decoding by decoder 930, last, then via amplifier 940 amplification forwardings.

Meanwhile, via node R forwards the ACK/NACK message from destination node.

At trunking scheme selected cell 910, by Transmit-Receive Unit, receive the SNR of destination node D periodic feedback _rdand SNR _sdtime, trunking scheme selected cell 910 redefines trunking scheme, if new definite trunking scheme is identical with the trunking scheme of using at present, trunking scheme selected cell 910 does not carry out any processing; On the other hand, if new definite trunking scheme is different from the trunking scheme of using at present, trunking scheme selected cell 910 passes through Transmit-Receive Unit, newly definite trunking scheme is changed to message by trunking scheme and inform source node S, after source node returns to change acknowledge message, trunking scheme selected cell 910 changes to new definite trunking scheme by the trunking scheme of using at present.

It should be noted in the discussion above that in above description, only in the mode of example, show technical scheme of the present invention, but be not intended that the invention be limited to above-mentioned steps and cellular construction.Under possible situation, can as required step and cellular construction be adjusted and be accepted or rejected.Therefore, the necessary element of overall invention thought of the present invention is not implemented in some step and unit.Therefore, technical characterictic essential to the invention is only limited to the minimum requirements that can realize overall invention thought of the present invention, and is not subject to the restriction of above instantiation.

So far invention has been described in conjunction with the preferred embodiments.Should be appreciated that, those skilled in the art without departing from the spirit and scope of the present invention, can carry out various other change, replacement and interpolations.Therefore, scope of the present invention is not limited to above-mentioned specific embodiment, and should be limited by claims.

Claims (16)

1. be used in the trunking scheme system of selection in via node, comprise:

Demodulation is from the initiation of communication message of source node, and according to initiation of communication message, measures the channel quality information of the source-trunk channel from source node to via node;

After initiation of communication message sink completes, initiation of communication message is forwarded to destination node;

According to the channel quality information of the source-trunk channel measuring and the channel quality information of relaying-object channel being fed back by destination node and the channel quality information of source-object channel, select trunking scheme; And

The channel quality information of source-trunk channel, relaying-object channel and source-object channel is sent to source node with together with selected trunking scheme,

Wherein:

The channel quality information of the channel quality information of the channel quality information of source-trunk channel, relaying-object channel and source-object channel is respectively the receiving terminal received signal to noise ratio SNR of source-trunk channel _sr, relaying-object channel receiving terminal received signal to noise ratio SNR _rdand the receiving terminal received signal to noise ratio SNR of source-object channel _sd,

Wherein

If (1+SNR _l1) ²>=1+SNR _aF, select and/or definite L1 directly amplifies mode;

Otherwise, select and/or definite amplification forwarding mode,

Wherein

${\mathrm{SNR}}_{L1}=\frac{1}{\frac{1}{{\mathrm{SNR}}_{\mathrm{sr}}}+\frac{1}{{\mathrm{SNR}}_{\mathrm{rd}}}+\frac{{\mathrm{SNR}}_{\mathrm{sd}}}{{\mathrm{SNR}}_{\mathrm{rd}}}(1+\frac{1}{{\mathrm{SNR}}_{\mathrm{sr}}})},$

${\mathrm{SNR}}_{\mathrm{AF}}=\frac{1}{\frac{1}{{\mathrm{SNR}}_{\mathrm{sr}}}+\frac{1}{{\mathrm{SNR}}_{\mathrm{rd}}}},$

Or

If (1+SNR _l1) ²>=1+SNR _dF, select and/or definite L1 directly amplifies mode;

Otherwise, select and/or definite decoding pass-through mode,

Wherein

${\mathrm{SNR}}_{L1}=\frac{1}{\frac{1}{{\mathrm{SNR}}_{\mathrm{sr}}}+\frac{1}{{\mathrm{SNR}}_{\mathrm{rd}}}+\frac{{\mathrm{SNR}}_{\mathrm{sd}}}{{\mathrm{SNR}}_{\mathrm{rd}}}(1+\frac{1}{{\mathrm{SNR}}_{\mathrm{sr}}})},$

SNR _DF=min{SNR _sr，SNR _rd}，

Or

If SNR _aF>=SNR _req, select and/or definite amplification forwarding mode;

Otherwise, select and/or definite decoding pass-through mode,

Wherein

${\mathrm{SNR}}_{\mathrm{AF}}=\frac{1}{\frac{1}{{\mathrm{SNR}}_{\mathrm{sr}}}+\frac{1}{{\mathrm{SNR}}_{\mathrm{rd}}}},$

SNR _reqbe according to current adopted coding and modulation system, can reach the minimum received signal to noise ratio of desired decoding accuracy rate.

2. trunking scheme system of selection according to claim 1, also comprises:

According to selected trunking scheme, the transmission data from source node are processed, and be forwarded to destination node;

When receiving the channel quality information of relaying-object channel of destination node periodic feedback and the channel quality information of source-object channel, according to the channel quality information of the source-trunk channel measuring with by the channel quality information of relaying-object channel and the channel quality information of source-object channel of the up-to-date feedback of destination node, redefine trunking scheme;

If new definite trunking scheme is identical with the trunking scheme of using at present, still continues to use the trunking scheme of using at present, and do not carry out more changed handling of trunking scheme; And

If new definite trunking scheme is different from the trunking scheme of using at present, newly definite trunking scheme is changed to message by trunking scheme and inform source node, and when source node returns to change acknowledge message, the trunking scheme of using is at present changed to new definite trunking scheme.

3. trunking scheme system of selection according to claim 2, is characterized in that:

For redefining the channel quality information of source-trunk channel of trunking scheme, be at first according to initiation of communication message, to measure, or according to transmitting data again or periodic measurement obtains.

4. according to the trunking scheme system of selection one of claim 1～3 Suo Shu, it is characterized in that:

Selecting trunking scheme and/or redefining in the step of trunking scheme, also, according to the demand for services of destination node and the trunking scheme of supporting, selecting trunking scheme and/or redefine trunking scheme.

5. be used in the trunking scheme system of selection in via node, comprise:

According to the trunking scheme of using at present, the transmission data from source node are processed, and be forwarded to destination node;

When receiving the channel quality information of relaying-object channel of destination node periodic feedback and the channel quality information of source-object channel, according to the channel quality information of source-trunk channel with by the channel quality information of relaying-object channel and the channel quality information of source-object channel of the up-to-date feedback of destination node, determine new trunking scheme; And

If determined new trunking scheme is different from the trunking scheme of using at present, determined new trunking scheme is changed to message by trunking scheme and inform source node, and when source node returns to change acknowledge message, the trunking scheme of using is at present changed to determined new trunking scheme

Wherein:

The channel quality information of the channel quality information of the channel quality information of source-trunk channel, relaying-object channel and source-object channel is respectively the receiving terminal received signal to noise ratio SNR of source-trunk channel _sr, relaying-object channel receiving terminal received signal to noise ratio SNR _rdand the receiving terminal received signal to noise ratio SNR of source-object channel _sd,

Wherein

If (1+SNR _l1) ²>=1+SNR _aF, select and/or definite L1 directly amplifies mode;

Otherwise, select and/or definite amplification forwarding mode,

Wherein

${\mathrm{SNR}}_{L1}=\frac{1}{\frac{1}{{\mathrm{SNR}}_{\mathrm{sr}}}+\frac{1}{{\mathrm{SNR}}_{\mathrm{rd}}}+\frac{{\mathrm{SNR}}_{\mathrm{sd}}}{{\mathrm{SNR}}_{\mathrm{rd}}}(1+\frac{1}{{\mathrm{SNR}}_{\mathrm{sr}}})},$

${\mathrm{SNR}}_{\mathrm{AF}}=\frac{1}{\frac{1}{{\mathrm{SNR}}_{\mathrm{sr}}}+\frac{1}{{\mathrm{SNR}}_{\mathrm{rd}}}},$

Or

If (1+SNR _l1) ²>=1+SNR _dF, select and/or definite L1 directly amplifies mode;

Otherwise, select and/or definite decoding pass-through mode,

Wherein

${\mathrm{SNR}}_{L1}=\frac{1}{\frac{1}{{\mathrm{SNR}}_{\mathrm{sr}}}+\frac{1}{{\mathrm{SNR}}_{\mathrm{rd}}}+\frac{{\mathrm{SNR}}_{\mathrm{sd}}}{{\mathrm{SNR}}_{\mathrm{rd}}}(1+\frac{1}{{\mathrm{SNR}}_{\mathrm{sr}}})},$

SNR _DF=min{SNR _sr，SNR _rd}，

Or

If SNR _aF>=SNR _req, select and/or definite amplification forwarding mode;

Otherwise, select and/or definite decoding pass-through mode,

Wherein

${\mathrm{SNR}}_{\mathrm{AF}}=\frac{1}{\frac{1}{{\mathrm{SNR}}_{\mathrm{sr}}}+\frac{1}{{\mathrm{SNR}}_{\mathrm{rd}}}},$

SNR _reqbe according to current adopted coding and modulation system, can reach the minimum received signal to noise ratio of desired decoding accuracy rate.

6. trunking scheme system of selection according to claim 5, also comprises:

If determined new trunking scheme is identical with the trunking scheme of using at present, still continues to use the trunking scheme of using at present, and do not carry out more changed handling of trunking scheme.

7. trunking scheme system of selection according to claim 5, is characterized in that:

For determining that the channel quality information of the source-trunk channel of new trunking scheme is at first to measure according to initiation of communication message, or according to transmitting data again or periodic measurement obtains.

8. according to the trunking scheme system of selection one of claim 5～7 Suo Shu, it is characterized in that:

In determining the step of new trunking scheme, also, according to the demand for services of destination node and the trunking scheme of supporting, determine new trunking scheme.

9. a via node, comprising:

R-T unit, for from and/or to source node, receive and/or send data message, and from and/or to destination node, receive and/or send data message;

Demodulator, for demodulation, by described R-T unit, receive, from the initiation of communication message of source node;

Source-trunk channel apparatus for measuring quality, for measuring the channel quality information of the source-trunk channel from source node to via node; And

Trunking scheme choice device, channel quality information and the channel quality information of relaying-object channel receiving by described R-T unit, fed back by destination node and the channel quality information of source-object channel of the source-trunk channel measuring for basis, select trunking scheme

Wherein after initiation of communication message sink completes, by described R-T unit, initiation of communication message is forwarded to destination node, and by described R-T unit, the channel quality information of source-trunk channel, relaying-object channel and source-object channel is sent to source node with together with selected trunking scheme

Wherein:

The channel quality information of the channel quality information of the channel quality information of source-trunk channel, relaying-object channel and source-object channel is respectively the receiving terminal received signal to noise ratio SNR of source-trunk channel _sr, relaying-object channel receiving terminal received signal to noise ratio SNR _rdand the receiving terminal received signal to noise ratio SNR of source-object channel _sd,

Wherein

If (1+SNR _l1) ²>=1+SNR _aF, described trunking scheme choice device is selected and/or is determined that L1 directly amplifies mode;

Otherwise described trunking scheme choice device is selected and/or is determined amplification forwarding mode,

Wherein

${\mathrm{SNR}}_{L1}=\frac{1}{\frac{1}{{\mathrm{SNR}}_{\mathrm{sr}}}+\frac{1}{{\mathrm{SNR}}_{\mathrm{rd}}}+\frac{{\mathrm{SNR}}_{\mathrm{sd}}}{{\mathrm{SNR}}_{\mathrm{rd}}}(1+\frac{1}{{\mathrm{SNR}}_{\mathrm{sr}}})},$

${\mathrm{SNR}}_{\mathrm{AF}}=\frac{1}{\frac{1}{{\mathrm{SNR}}_{\mathrm{sr}}}+\frac{1}{{\mathrm{SNR}}_{\mathrm{rd}}}},$

Or

If (1+SNR _l1) ²>=1+SNR _dF, described trunking scheme choice device is selected and/or is determined that L1 directly amplifies mode;

Otherwise described trunking scheme choice device is selected and/or is determined decoding pass-through mode,

Wherein

${\mathrm{SNR}}_{L1}=\frac{1}{\frac{1}{{\mathrm{SNR}}_{\mathrm{sr}}}+\frac{1}{{\mathrm{SNR}}_{\mathrm{rd}}}+\frac{{\mathrm{SNR}}_{\mathrm{sd}}}{{\mathrm{SNR}}_{\mathrm{rd}}}(1+\frac{1}{{\mathrm{SNR}}_{\mathrm{sr}}})},$

SNR _DF=min{SNR _sr，SNR _rd}，

Or

If SNR _aF>=SNR _req, described trunking scheme choice device is selected and/or is determined amplification forwarding mode;

Otherwise described trunking scheme choice device is selected and/or is determined decoding pass-through mode,

Wherein

${\mathrm{SNR}}_{\mathrm{AF}}=\frac{1}{\frac{1}{{\mathrm{SNR}}_{\mathrm{sr}}}+\frac{1}{{\mathrm{SNR}}_{\mathrm{rd}}}},$

SNR _reqbe according to current adopted coding and modulation system, can reach the minimum received signal to noise ratio of desired decoding accuracy rate.

10. via node according to claim 9, also comprises:

Transmission data processing equipment, for according to selected trunking scheme, to by described R-T unit, receive, from the transmission data of source node, process, and by described R-T unit, be forwarded to destination node,

While wherein receiving the channel quality information of relaying-object channel of destination node periodic feedback and the channel quality information of source-object channel by described R-T unit at described trunking scheme choice device, according to the channel quality information of the source-trunk channel measuring with by the channel quality information of relaying-object channel and the channel quality information of source-object channel of the up-to-date feedback of destination node, redefine trunking scheme;

If new definite trunking scheme is identical with the trunking scheme of using at present, still continue to use the trunking scheme of using at present, and described trunking scheme choice device is not carried out more changed handling of trunking scheme; And

If new definite trunking scheme is different from the trunking scheme of using at present, described trunking scheme choice device is by described R-T unit, newly definite trunking scheme is changed to message by trunking scheme and inform source node, and when receiving by described R-T unit the change acknowledge message of returning from source node, the trunking scheme of using is at present changed to new definite trunking scheme.

11. via nodes according to claim 10, is characterized in that:

For redefining the channel quality information of source-trunk channel of trunking scheme, by described source-trunk channel apparatus for measuring quality, according to initiation of communication message, measured at first, or by described source-trunk channel apparatus for measuring quality according to transmission data again or periodic measurement obtain.

12. according to the via node one of claim 9～11 Suo Shu, it is characterized in that:

Described trunking scheme choice device also, according to the demand for services of destination node and the trunking scheme of supporting, is selected trunking scheme and/or redefines trunking scheme.

13. 1 kinds of via nodes, comprising:

R-T unit, for from and/or to source node, receive and/or send data message, and from and/or to destination node, receive and/or send data message;

Transmission data processing equipment, for according to the trunking scheme of using at present, to by described R-T unit, receive, from the transmission data of source node, process, and by described R-T unit, be forwarded to destination node;

Source-trunk channel apparatus for measuring quality, for measuring the channel quality information of the source-trunk channel from source node to via node; And

Trunking scheme choice device, for when receiving the channel quality information of relaying-object channel of destination node periodic feedback and the channel quality information of source-object channel by described R-T unit, according to the channel quality information of source-trunk channel with by the channel quality information of relaying-object channel and the channel quality information of source-object channel of the up-to-date feedback of destination node, determine new trunking scheme

If wherein determined new trunking scheme is different from the trunking scheme of using at present, described trunking scheme choice device is by described R-T unit, determined new trunking scheme is changed to message by trunking scheme and inform source node, and when receiving by described R-T unit the change acknowledge message of returning from source node, the trunking scheme of using is at present changed to determined new trunking scheme

Wherein:

The channel quality information of the channel quality information of the channel quality information of source-trunk channel, relaying-object channel and source-object channel is respectively the receiving terminal received signal to noise ratio SNR of source-trunk channel _sr, relaying-object channel receiving terminal received signal to noise ratio SNR _rdand the receiving terminal received signal to noise ratio SNR of source-object channel _sd,

Wherein

If (1+SNR _l1) ²>=1+SNR _aF, described trunking scheme choice device is selected and/or is determined that L1 directly amplifies mode;

Otherwise described trunking scheme choice device is selected and/or is determined amplification forwarding mode,

Wherein

${\mathrm{SNR}}_{L1}=\frac{1}{\frac{1}{{\mathrm{SNR}}_{\mathrm{sr}}}+\frac{1}{{\mathrm{SNR}}_{\mathrm{rd}}}+\frac{{\mathrm{SNR}}_{\mathrm{sd}}}{{\mathrm{SNR}}_{\mathrm{rd}}}(1+\frac{1}{{\mathrm{SNR}}_{\mathrm{sr}}})},$

${\mathrm{SNR}}_{\mathrm{AF}}=\frac{1}{\frac{1}{{\mathrm{SNR}}_{\mathrm{sr}}}+\frac{1}{{\mathrm{SNR}}_{\mathrm{rd}}}},$

Or

If (1+SNR _l1) ²>=1+SNR _dF, described trunking scheme choice device is selected and/or is determined that L1 directly amplifies mode;

Otherwise described trunking scheme choice device is selected and/or is determined decoding pass-through mode,

Wherein

${\mathrm{SNR}}_{L1}=\frac{1}{\frac{1}{{\mathrm{SNR}}_{\mathrm{sr}}}+\frac{1}{{\mathrm{SNR}}_{\mathrm{rd}}}+\frac{{\mathrm{SNR}}_{\mathrm{sd}}}{{\mathrm{SNR}}_{\mathrm{rd}}}(1+\frac{1}{{\mathrm{SNR}}_{\mathrm{sr}}})},$

SNR _DF=min{SNR _sr，SNR _rd}，

Or

If SNR _aF>=SNR _req, described trunking scheme choice device is selected and/or is determined amplification forwarding mode;

Otherwise described trunking scheme choice device is selected and/or is determined decoding pass-through mode,

Wherein

${\mathrm{SNR}}_{\mathrm{AF}}=\frac{1}{\frac{1}{{\mathrm{SNR}}_{\mathrm{sr}}}+\frac{1}{{\mathrm{SNR}}_{\mathrm{rd}}}},$

SNR _reqbe according to current adopted coding and modulation system, can reach the minimum received signal to noise ratio of desired decoding accuracy rate.

14. via nodes according to claim 13, is characterized in that:

If determined new trunking scheme is identical with the trunking scheme of using at present, still continue to use the trunking scheme of using at present, and described trunking scheme choice device is not carried out more changed handling of trunking scheme.

15. via nodes according to claim 13, is characterized in that:

For determining that the channel quality information of the source-trunk channel of new trunking scheme is measured according to initiation of communication message at first by described source-trunk channel apparatus for measuring quality, or by described source-trunk channel apparatus for measuring quality according to transmission data again or periodic measurement obtain.

16. according to the via node one of claim 13～15 Suo Shu, it is characterized in that:

Described trunking scheme choice device also, according to the demand for services of destination node and the trunking scheme of supporting, is determined new trunking scheme.

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