CN104883212A - Data transmission method and apparatus based on cooperative relay and frequency spectrum aggregation - Google Patents

Abstract

The embodiment of the invention, which relates to the technical field of wireless communication, discloses a data transmission method and apparatus based on cooperative relay and frequency spectrum aggregation. The method comprises: a source node set S with the data transmission demand at current time is determined; for each relay node rj in a preset relay node set R, rj distribution is carried out based on relations between location of each source node si and location of a corresponding target node di and a service range of the rj, and then an alternative relay node set Rsi of each source node si is obtained; an idle frequency spectrum set Fsi of each source node si and an idle frequency spectrum set FRsi of the corresponding Rsi of the si are obtained; for each source node si, an available idle frequency spectrum set FAsi of the si is determined; and each source node si transmits data to the target node di corresponding to the si by the relay node contained by the Rsi at the frequency spectrum contained by the FAsi. According to the technical scheme provided by the embodiment of the invention, the communication efficiency can be improved.

Description

A kind of data transmission method based on cooperating relay and spectrum aggregating and device

Technical field

The present invention relates to wireless communication technology field, particularly a kind of data transmission method based on cooperating relay and spectrum aggregating and device.

Background technology

In recent years, the development of wireless communication technology and the appearance of high data rate service have consumed nearly all usable spectrum, thus make frequency spectrum become a kind of very rare Radio Resource, be difficult to find the bandwidth that can meet new technology and demand for services within the scope of usable spectrum.In addition, based on the existing fixed frequency spectrum method of salary distribution, most frequency spectrum has been assigned with the authorized user giving and specify, but this fixing spectrum allocation may mode, no matter all lower to the utilization ratio of frequency spectrum over time and space.

For these reasons, in prior art, when carrying out transfer of data in cooperative relay network, introduce cognitive radio frequency spectrum cognition technology, enable user's dynamic access idle frequency spectrum of transmission demand.But in practical application, a lot of idle frequency spectrum is all often discrete, and a single frequency band is difficult to meet the demand of LTE-Advanced to bandwidth.Therefore, in order to meet ever-increasing rate requirement and diversified business demand, LTE-Advanced proposes spectrum aggregating concept.The core thinking of spectrum aggregating technology is: by multiple continuously or discrete spectrum condense together, form a wider frequency spectrum.The application of this technology had both met the demand of LTE-Advanced in bandwidth, can improve again the utilance of frequency spectrum fragment.On the other hand, during actual spectrum uses, have not by the discrete spectrum section used in a lot of authorized frequency range.But these idle frequency ranges can not be used by other unauthorized users, and this just causes the waste of frequency spectrum when frequency spectrum resource shortage, therefore, utilize spectrum aggregating technology to carry out transfer of data, can improve the utilance of frequency spectrum.

But, in prior art, when utilizing spectrum aggregating technology to carry out transfer of data, generally only consider that synchronization single user has the situation of data transfer demands, and in practical application, the multiple user of synchronization has the situation of data transfer demands also more common, therefore, when the multiple user of synchronization has a data transfer demands, application prior art carries out transfer of data, owing to not considering the performance of whole network, communication efficiency is lower.

Summary of the invention

The embodiment of the invention discloses a kind of data transmission method based on cooperating relay and spectrum aggregating and device, with when the multiple user of synchronization has data transfer demands, improve communication efficiency.

For achieving the above object, the embodiment of the invention discloses a kind of data transmission method based on cooperating relay and spectrum aggregating, described method comprises:

Determine that current time exists the source node S set of data transfer demands;

For each via node r in the set of relay nodes R preset _j, according to source node s each in described S _ithe destination node d of present position and correspondence thereof _ipresent position respectively with r _jservice range between relation, determine r _jfor the allocation strategy of source node, to r _jdistribute, and obtain each source node s in described S according to allocation result _icorresponding alternative set of relay nodes R _si, wherein, each source node allows to be existed the via node of multiple correspondence or to there is not the via node of correspondence; Each via node allows to exist a corresponding source node or there is not corresponding source node at the most;

According to the frequency spectrum perception algorithm preset, obtain each source node s in described S _iidle frequency spectrum set F _si, and s _icorresponding R _siidle frequency spectrum set F _rsi;

For each source node s in described S _i, according to F _siand F _rsi, determine s _iavailable free frequency spectrum set F _asi, wherein, a frequency spectrum only belongs to available free frequency spectrum set corresponding to a source node;

Each source node s in described S _iat its F _asion the frequency spectrum comprised, pass through R _siin the via node that comprises to s _icorresponding destination node d _itransmission data.

In a kind of specific implementation of the present invention, each via node r in the described set of relay nodes R for presetting _j, according to source node s each in described S _ithe destination node d of present position and correspondence thereof _ipresent position respectively with r _jservice range between relation, determine r _jfor the allocation strategy of source node, to r _jdistribute, and obtain each source node s in described S according to allocation result _icorresponding alternative set of relay nodes R _si, comprising:

Arranging the first judgement initial value j is 1;

Judge via node r _jwhether the quantity that service range interior nodes is right equals 1, and wherein, a node centering comprises: a source node, and according to the destination node that the data transfer demands of this source node is determined;

If equal 1, by r _jdistribute to r _jthe source node of service range interior nodes centering;

If be not equal to 1, judge r _jwhether the quantity that service range interior nodes is right is greater than 1;

If be greater than, predict r respectively _jin service range, the source node of each node centering passes through r _jnetwork throughput predicted value when carrying out data communication with the destination node of this node centering, and by r _jdistribute to the source node that in above-mentioned result of calculation, maximum network throughput prediction value is corresponding;

The value upgrading j is j+1;

Judge whether j is greater than the quantity of included via node in described R;

If be not more than, return described judgement r _jwhether the quantity that service range interior nodes is right equals the step of 1;

Each source node s in described S is obtained according to allocation result _icorresponding alternative set of relay nodes R _si.

In a kind of specific implementation of the present invention, describedly predict r respectively _jin service range, the source node of each node centering passes through r _jnetwork throughput predicted value when carrying out data communication with the destination node of this node centering, comprising:

When relay cooperative communication pattern is decoding forward collaboration communication pattern, according to following formula, predict r respectively _jin service range, the source node of each node centering passes through r _jnetwork throughput predicted value when carrying out data communication with the destination node of this node centering,

$T_{rj,dt}={\mathrm{blog}}_2(1+\frac{P_{rj,dt}\×h_{rj,dt}}{{\mathrm{\ΓN}}_{0}W})$

Wherein, T _{rj, dt}represent s _tby via node r _jthe destination node d corresponding with it _tcarry out network throughput predicted value during data communication, s _trepresent r _jthe source node of any one node centering in service range, b represents the bandwidth of usable spectrum, N ₀w represents the noise power of system, and Γ represents the amount of redundancy associated with physical level coded modulation, P _{rj, dt}and h _{rj, dt}represent the via node r preset _jwith destination node d _ttransmitted power when carrying out data communication and channel gain.

In a kind of specific implementation of the present invention, described for each source node s in described S _i, according to F _siand F _rsi, determine s _iavailable free frequency spectrum set F _asi, comprising:

Arranging the second judgement initial value y is 1;

Judge that whether the frequency spectrum f being designated y is only for the source node s of in described S _imeet the following conditions,

F ∈ F _siand f ∈ F _rsi;

If yes, f is defined as s _ielement in corresponding available free frequency spectrum set;

If NO, from described S, the source node meeting above-mentioned condition is determined; The destination node that via node in the alternative set of relay nodes of prediction through determining each source node obtained is corresponding with this source node carries out signal-to-noise ratio to predict value during data communication; According to predicting the outcome, obtain the source node that maximum signal to noise ratio predicted value is corresponding; F is defined as the element in available free frequency spectrum set corresponding to obtained source node;

The value upgrading y is y+1;

Judge whether y is greater than default frequency spectrum quantity;

If be not more than, return described judgement and whether be designated the frequency spectrum f of y only for the source node s of in described S _ithe step met the following conditions.

In a kind of specific implementation of the present invention, the destination node that the via node in the alternative set of relay nodes of described prediction through determining each source node obtained is corresponding with this source node carries out signal-to-noise ratio to predict value during data communication, comprising:

According to following formula, predict signal-to-noise ratio to predict value when destination node that via node in the alternative set of relay nodes through determining each source node obtained is corresponding with this source node carries out data communication,

Wherein, represent on frequency spectrum f, via node r _lwith destination node d _zcarry out signal-to-noise ratio to predict value during data communication, d _zfor the r determined according to data transfer demands _lthe destination node that corresponding source node is corresponding, N ₀w represents the noise power of system, and Γ represents the amount of redundancy associated with physical level coded modulation, P _{f, dz}and h _{f, dz}represent preset on frequency spectrum f, via node r _lwith destination node d _ztransmitted power when carrying out data communication and channel gain.

In a kind of specific implementation of the present invention, each source node s in described S _iat its F _asion the frequency spectrum comprised, pass through R _siin the via node that comprises to s _icorresponding destination node d _itransmission data, comprising:

Each source node s from described S _if _asir is determined in the frequency spectrum comprised _siin the idle frequency spectrum of each via node that comprises;

On the idle frequency spectrum of each via node determined, by this via node to s _icorresponding destination node d _itransmission data.

For achieving the above object, the embodiment of the invention discloses a kind of data transmission device based on cooperating relay and spectrum aggregating, described device comprises:

Source node set determination module, for determining that current time exists the source node S set of data transfer demands;

Alternative set of relay nodes obtains module, for for each via node r in the set of relay nodes R preset _j, according to source node s each in described S _ithe destination node d of present position and correspondence thereof _ipresent position respectively with r _jservice range between relation, determine r _jfor the allocation strategy of source node, to r _jdistribute, and obtain each source node s in described S according to allocation result _icorresponding alternative set of relay nodes R _si, wherein, each source node allows to be existed the via node of multiple correspondence or to there is not the via node of correspondence; Each via node allows to exist a corresponding source node or there is not corresponding source node at the most;

Idle frequency spectrum set obtains module, for according to the frequency spectrum perception algorithm preset, obtains each source node s in described S _iidle frequency spectrum set F _si, and s _icorresponding R _siidle frequency spectrum set F _rsi;

Available free frequency spectrum set determination module, for for each source node s in described S _i, according to F _siand F _rsi, determine s _iavailable free frequency spectrum set F _asi, wherein, a frequency spectrum only belongs to available free frequency spectrum set corresponding to a source node;

Data transmission module, for source node s each in described S _iat its F _asion the frequency spectrum comprised, pass through R _siin the via node that comprises to s _icorresponding destination node d _itransmission data.

In a kind of specific implementation of the present invention, described alternative set of relay nodes obtains module, comprising:

First initial value arranges submodule, is 1 for arranging the first judgement initial value j;

First node judges submodule to quantity, for judging via node r _jwhether the quantity that service range interior nodes is right equals 1, and wherein, a node centering comprises: a source node, and according to the destination node that the data transfer demands of this source node is determined;

First via node distribution sub module, for when described first node judges the judged result of submodule for being to quantity, by r _jdistribute to r _jthe source node of service range interior nodes centering;

Section Point judges submodule to quantity, at described first node to when judging that the judged result of submodule is no, judge r _jwhether the quantity that service range interior nodes is right is greater than 1;

Second via node distribution sub module, for when described Section Point judges the judged result of submodule for being to quantity, predicts r respectively _jin service range, the source node of each node centering passes through r _jnetwork throughput predicted value when carrying out data communication with the destination node of this node centering, and by r _jdistribute to the source node that in above-mentioned result of calculation, maximum network throughput prediction value is corresponding;

First numerical value upgrades submodule, is j+1 for upgrading the value of j;

First numerical value judges submodule, for judging whether j is greater than the quantity of included via node in described R, if be not more than, trigger described first node and judges that submodule decision node is to quantity to quantity;

Alternative set of relay nodes obtains submodule, for obtaining each source node s in described S according to allocation result _icorresponding alternative set of relay nodes R _si.

In a kind of specific implementation of the present invention, described available free frequency spectrum set determination module, comprising:

Second initial value arranges submodule, is 1 for arranging the second judgement initial value y;

Frequency spectrum judges submodule, for judging that whether the frequency spectrum f being designated y is only for the source node s of in described S _imeet the following conditions,

F ∈ F _siand f ∈ F _rsi;

First idle frequency spectrum determination submodule, for when described frequency spectrum judges the judged result of submodule for being, is defined as s by f _ielement in corresponding available free frequency spectrum set;

Source node determination submodule, for judging that the judged result of submodule is no at described frequency spectrum, determines the source node meeting above-mentioned condition from described S;

Signal-to-noise ratio to predict value prediction submodule, for predicting signal-to-noise ratio to predict value when destination node that via node in the alternative set of relay nodes through determining each source node obtained is corresponding with this source node carries out data communication;

Source node obtains submodule, for according to predicting the outcome, obtains the source node that maximum signal to noise ratio predicted value is corresponding;

Second idle frequency spectrum determination submodule, for being defined as the element in available free frequency spectrum set corresponding to obtained source node by f;

Second value upgrades submodule, is y+1 for upgrading the value of y;

Second value judges submodule, for judging whether y is greater than default frequency spectrum quantity, if being not more than, triggering described frequency spectrum and judging that submodule carries out frequency spectrum judgement.

In a kind of specific implementation of the present invention, described data transmission module, comprising:

Idle frequency spectrum determination submodule, for source node s each from described S _if _asir is determined in the frequency spectrum comprised _siin the idle frequency spectrum of each via node that comprises;

Transfer of data submodule, for the idle frequency spectrum at each via node determined, by this via node to s _icorresponding destination node d _itransmission data.

As seen from the above, in the scheme that the embodiment of the present invention provides, after determining that current time exists the source node set of data transfer demands, first for each via node in the set of relay nodes preset, obtain the corresponding alternative set of relay nodes of each source node in source node set, determine each source node and the common corresponding available free frequency spectrum set of alternative set of relay nodes thereof again, then each source node is in the available free frequency spectrum set of its correspondence, by the via node in its alternative set of relay nodes to its destination node transmission data.The situation of all via nodes in other source nodes of data transfer demands and default set of relay nodes is there is owing to considering synchronization in cooperative relay network when the available free frequency spectrum set determining each source node, so, the scheme that the application embodiment of the present invention provides is when carrying out transfer of data, can carry out in conjunction with the performance of whole network, and then can communication efficiency be improved.

Accompanying drawing explanation

In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.

The schematic flow sheet of a kind of data transmission method based on cooperating relay and spectrum aggregating that Fig. 1 provides for the embodiment of the present invention;

A kind of schematic flow sheet distributing the method for via node that Fig. 2 provides for the embodiment of the present invention;

A kind of schematic flow sheet determining the method for the available free frequency spectrum set of each source node that Fig. 3 provides for the embodiment of the present invention;

The structural representation of a kind of data transmission device based on cooperating relay and spectrum aggregating that Fig. 4 provides for the embodiment of the present invention.

Embodiment

When utilizing spectrum aggregating technology to carry out transfer of data in cooperative relay network, because the multiple user of synchronization in practical application has the situation of data transfer demands comparatively general simultaneously, and data transmission method of the prior art, the situation of transfer of data is normally had based on synchronization single user, Given this, embodiments provide a kind of data transmission method based on cooperating relay and spectrum aggregating and device, with make synchronization in cooperative relay network exist multiple user have a situation of data transfer demands time, the performance of whole network can be considered, improve communication efficiency.

Those skilled in the art are understandable that, destination node from source node to its correspondence transmission data time, under normal circumstances, source node is first on usable spectrum, the data that will transmit are transferred to via node, then, received data spread out of to destination node by via node again on usable spectrum.

It should be noted that, in the data transmission method that each embodiment of the present invention provides, the executive agent of each step can be source node, via node can also be destination node, the application does not limit this.

Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.

The schematic flow sheet of a kind of data transmission method based on cooperating relay and spectrum aggregating that Fig. 1 provides for the embodiment of the present invention, the method comprises:

S101: determine that current time exists the source node S set of data transfer demands.

The embodiment of the present invention mainly exists multiple source node for current time has the situation of data transfer demands to propose, and namely in source node S set, the quantity of institute's containing element is greater than 1, wherein, and each element representation source node.

Wherein, a source node in source node S set can be understood as the terminal equipment that a user uses, and when comprising multiple source node in source node S set, can be understood as the terminal equipment that multiple user wishes to be used by it and carries out transfer of data.

S102: for each via node r in the set of relay nodes R preset _j, according to source node s each in S _ithe destination node d of present position and correspondence thereof _ipresent position respectively with r _jservice range between relation, determine r _jfor the allocation strategy of source node, to r _jdistribute, and obtain each source node s in S according to allocation result _icorresponding alternative set of relay nodes R _si.

Concrete, when distributing via node, each source node allows to be existed the via node of multiple correspondence or to there is not the via node of correspondence; Each via node allows to exist a corresponding source node or there is not corresponding source node at the most.

Above-mentioned s _irefer to the arbitrary element in source node S set, 1≤i≤N, wherein, N is the number of element in S; r _jfor the arbitrary element in set of relay nodes R, 1≤j≤M, wherein, M is the number of element in R.The application does not limit the magnitude relationship between N, M.

Each source node s in above-mentioned S _ithe destination node d of present position and correspondence thereof _ipresent position respectively with r _jservice range between relation, following several situation can be divided into:

S _iand d _iall be not positioned at r _jservice range in;

S _ibe positioned at r _jservice range in, and d _ibe not positioned at r _jservice range in;

S _ibe not positioned at r _jservice range in, and d _ibe positioned at r _jservice range in;

S _iand d _iall be positioned at r _jservice range in.

Be understandable that, be no matter source node or destination node is only when it is positioned at relay node services scope, source node or destination node could carry out data communication with via node, therefore, are determining r _jduring allocation strategy for source node, can be that the source node being only all positioned at the service range of a certain via node for source node and its destination node distributes, can also be that the source node being positioned at the service range of a certain via node for only source node distributes, in this case, the situation that many relayings combine can be considered.

In one particular embodiment of the present invention, see Fig. 2, provide a kind of schematic flow sheet distributing the method for via node, the method comprises:

S102A: arranging the first judgement initial value j is 1.

S102B: judge via node r _jwhether the quantity that service range interior nodes is right equals 1, if equal, performs S102C, otherwise, perform S102D.

Wherein, a node centering comprises: a source node, and according to the destination node that the data transfer demands of this source node is determined.

S102C: by r _jdistribute to r _jthe source node of service range interior nodes centering.

After this step, perform S102F to continue subsequent step.

S102D: judge r _jwhether the quantity that service range interior nodes is right is greater than 1, if be greater than, performs S102E, otherwise, perform S102F.

S102E: predict r respectively _jin service range, the source node of each node centering passes through r _jnetwork throughput predicted value when carrying out data communication with the destination node of this node centering, and by r _jdistribute to the source node that in above-mentioned result of calculation, maximum network throughput prediction value is corresponding.

Concrete, when relay cooperative communication pattern is decoding forward collaboration communication pattern, according to following formula, r can be predicted respectively _jin service range, the source node of each node centering passes through r _jnetwork throughput predicted value when carrying out data communication with the destination node of this node centering,

$T_{rj,dt}={\mathrm{blog}}_2(1+\frac{P_{rj,dt}\×h_{rj,dt}}{{\mathrm{\ΓN}}_{0}W})$

Wherein, T _{rj, dt}represent s _tby via node r _jthe destination node d corresponding with it _tcarry out network throughput predicted value during data communication, s _trepresent r _jthe source node of any one node centering in service range, b represents the bandwidth of usable spectrum, N ₀w represents the noise power of system, and Γ represents the amount of redundancy associated with physical level coded modulation, concrete, can be set to the amount relevant with the error rate,

Such as, wherein, BER refers to the error rate.

P _{rj, dt}and h _{rj, dt}represent the via node r preset _jwith destination node d _ttransmitted power when carrying out data communication and channel gain.

It should be noted that, in relay cooperative communication pattern, with DF (Decode and Forward, decoding forwards) collaboration communication pattern is corresponding, also there is AF (Amplify and Forward, amplification forwarding) collaboration communication pattern, under AF collaboration communication pattern, predict that the mode of network throughput predicted value is different from the mode adopted under DF collaboration communication pattern.

Preferably, the bandwidth of each section of frequency spectrum is equal, supposes that total bandwidth is that B, B are divided into N section, namely, and the bandwidth of each section of frequency spectrum in this case, above-mentioned b equals

S102F: the value upgrading j is j+1.

S102G: judge whether j is greater than the quantity of included via node in R, if be not more than, perform S102B, otherwise, perform S102H.

S102H: process ends.

To complete according to above-mentioned S102A-S102H in R each via node for the distribution of source node after, each source node s in S can be obtained according to allocation result _icorresponding alternative set of relay nodes R _si.

It should be noted that, according to source node s each in the S that allocation result obtains _icorresponding alternative set of relay nodes R _si, each R _sithe quantity of middle comprised via node may be more than or equal to 1, may be also 0.

S103: according to the frequency spectrum perception algorithm preset, obtains each source node s in S _iidle frequency spectrum set F _si, and s _icorresponding R _siidle frequency spectrum set F _rsi.

Frequency spectrum perception technology belongs to the technology of comparative maturity in prior art, and those skilled in the art easily can be known according to professional knowledge, are no longer introduced here.

Obtain s _icorresponding R _siidle frequency spectrum set F _rsitime, first can obtain s respectively _icorresponding R _siin the idle frequency spectrum of each via node, and then generate R according to obtained idle frequency spectrum _siidle frequency spectrum set F _rsi.

S104: for each source node s in S _i, according to F _siand F _rsi, determine s _iavailable free frequency spectrum set F _asi.

Wherein, a frequency spectrum only belongs to available free frequency spectrum set corresponding to a source node.

In another specific embodiment of the present invention, see Fig. 3, provide a kind of schematic flow sheet determining the method for the available free frequency spectrum set of each source node, the method comprises:

S104A: arranging the second judgement initial value y is 1.

S104B: judge that whether the frequency spectrum f being designated y is only for the source node s of in S _imeet the condition preset, if yes, perform S104C, if NO, perform S104D.

Wherein, the condition preset is: f ∈ F _siand f ∈ F _rsi.

S104C: f is defined as s _ielement in corresponding available free frequency spectrum set.

After this step, perform S104H to continue subsequent step.

S104D: determine the source node meeting above-mentioned condition from S.

S104E: predict signal-to-noise ratio to predict value when destination node that via node in the alternative set of relay nodes through determining each source node obtained is corresponding with this source node carries out data communication.

Concrete, can according to following formula, predict signal-to-noise ratio to predict value when destination node that via node in the alternative set of relay nodes through determining each source node obtained is corresponding with this source node carries out data communication,

Wherein, represent on frequency spectrum f, via node r _lwith destination node d _zcarry out signal-to-noise ratio to predict value during data communication, d _zfor the r determined according to data transfer demands _lthe destination node that corresponding source node is corresponding, N ₀w represents the noise power of system, and Γ represents the amount of redundancy associated with physical level coded modulation, P _{f, dz}and h _{f, dz}represent preset on frequency spectrum f, via node r _lwith destination node d _ztransmitted power when carrying out data communication and channel gain.

S104F: according to predicting the outcome, obtains the source node that maximum signal to noise ratio predicted value is corresponding.

S104G: f is defined as the element in available free frequency spectrum set corresponding to obtained source node.

S104H: the value upgrading y is y+1.

S104I: judge whether y is greater than default frequency spectrum quantity, if be not more than, returns S104B, if be greater than, performs S104J.

S104J: process ends.

Each source node s in S105:S _iat its F _asion the frequency spectrum comprised, pass through R _siin the via node that comprises to s _icorresponding destination node d _itransmission data.

Concrete, each source node s in S _iat its F _asion the frequency spectrum comprised, pass through R _siin the via node that comprises to s _icorresponding destination node d _iduring transmission data, can first each source node s from S _if _asir is determined in the frequency spectrum comprised _siin the idle frequency spectrum of each via node that comprises, then on the idle frequency spectrum of each via node determined, by this via node to s _icorresponding destination node d _itransmission data.

On the idle frequency spectrum of each via node determined, by this via node to s _icorresponding destination node d _iduring transmission data, make use of each idle frequency spectrum of each via node, namely achieve spectrum aggregating, these frequency spectrums have cooperated s _iby this via node to d _isend data.

Suppose, source node s _if _asifor { f ₁, f ₂, f ₃, f ₄, f ₅, R _sifor { r ₁, r ₂, wherein, r ₁idle frequency spectrum comprise: f ₁, f ₃and f ₆, r ₂idle frequency spectrum comprise: f ₂, f ₄, f ₅, f ₆and f ₇, then from F _asir is determined in the frequency spectrum comprised _siin the idle frequency spectrum of each via node that comprises, be specially: r ₁idle frequency spectrum be: f ₁, f ₃, r ₂idle frequency spectrum be: f ₂, f ₄, f ₅, s _iat f ₁, f ₃on pass through r ₁to destination node d _itransmission data, and at f ₂, f ₄, f ₅on pass through r ₂to destination node d _itransmission data.

As seen from the above, in the scheme that each embodiment above-mentioned provides, after determining that current time exists the source node set of data transfer demands, first for each via node in the set of relay nodes preset, obtain the corresponding alternative set of relay nodes of each source node in source node set, determine each source node and the common corresponding available free frequency spectrum set of alternative set of relay nodes thereof again, then each source node is in the available free frequency spectrum set of its correspondence, by the via node in its alternative set of relay nodes to its destination node transmission data.The situation of all via nodes in other source nodes of data transfer demands and default set of relay nodes is there is owing to considering synchronization in cooperative relay network when the available free frequency spectrum set determining each source node, so, apply scheme that each embodiment above-mentioned provides when carrying out transfer of data, can carry out in conjunction with the performance of whole network, and then can communication efficiency be improved.

Corresponding with the above-mentioned data transmission method based on cooperating relay and spectrum aggregating, the embodiment of the present invention additionally provides a kind of data transmission device based on cooperating relay and spectrum aggregating.

The structural representation of a kind of data transmission device based on cooperating relay and spectrum aggregating that Fig. 4 provides for the embodiment of the present invention, this device comprises:

Source node set determination module 401, for determining that current time exists the source node S set of data transfer demands;

Alternative set of relay nodes obtains module 402, for for each via node r in the set of relay nodes R preset _j, according to source node s each in described S _ithe destination node d of present position and correspondence thereof _ipresent position respectively with r _jservice range between relation, determine r _jfor the allocation strategy of source node, to r _jdistribute, and obtain each source node s in described S according to allocation result _icorresponding alternative set of relay nodes R _si, wherein, each source node allows to be existed the via node of multiple correspondence or to there is not the via node of correspondence; Each via node allows to exist a corresponding source node or there is not corresponding source node at the most;

Idle frequency spectrum set obtains module 403, for according to the frequency spectrum perception algorithm preset, obtains each source node s in described S _iidle frequency spectrum set F _si, and s _icorresponding R _siidle frequency spectrum set F _rsi;

Available free frequency spectrum set determination module 404, for for each source node s in described S _i, according to F _siand F _rsi, determine s _iavailable free frequency spectrum set F _asi, wherein, a frequency spectrum only belongs to available free frequency spectrum set corresponding to a source node;

Data transmission module 405, for source node s each in described S _iat its F _asion the frequency spectrum comprised, pass through R _siin the via node that comprises to s _icorresponding destination node d _itransmission data.

Concrete, described alternative set of relay nodes obtains module 402 and can comprise:

First initial value arranges submodule, is 1 for arranging the first judgement initial value j;

First node judges submodule to quantity, for judging via node r _jwhether the quantity that service range interior nodes is right equals 1, and wherein, a node centering comprises: a source node, and according to the destination node that the data transfer demands of this source node is determined;

First via node distribution sub module, for when described first node judges the judged result of submodule for being to quantity, by r _jdistribute to r _jthe source node of service range interior nodes centering;

Section Point judges submodule to quantity, at described first node to when judging that the judged result of submodule is no, judge r _jwhether the quantity that service range interior nodes is right is greater than 1;

Second via node distribution sub module, for when described Section Point judges the judged result of submodule for being to quantity, predicts r respectively _jin service range, the source node of each node centering passes through r _jnetwork throughput predicted value when carrying out data communication with the destination node of this node centering, and by r _jdistribute to the source node that in above-mentioned result of calculation, maximum network throughput prediction value is corresponding;

First numerical value upgrades submodule, is j+1 for upgrading the value of j;

First numerical value judges submodule, for judging whether j is greater than the quantity of included via node in described R, if be not more than, trigger described first node and judges that submodule decision node is to quantity to quantity;

Alternative set of relay nodes obtains submodule, for obtaining each source node s in described S according to allocation result _icorresponding alternative set of relay nodes R _si.

Optionally, described second via node distribution sub module, can specifically in relay cooperative communication pattern be decoding forward collaboration communication pattern, according to following formula, predict r respectively _jin service range, the source node of each node centering passes through r _jnetwork throughput predicted value when carrying out data communication with the destination node of this node centering, and by r _jdistribute to the source node that in above-mentioned result of calculation, maximum network throughput prediction value is corresponding,

$T_{rj,dt}={\mathrm{blog}}_2(1+\frac{P_{rj,dt}\×h_{rj,dt}}{{\mathrm{\ΓN}}_{0}W})$

Wherein, T _{rj, dt}represent s _tby via node r _jthe destination node d corresponding with it _tcarry out network throughput predicted value during data communication, s _trepresent r _jthe source node of any one node centering in service range, b represents the bandwidth of usable spectrum, N ₀w represents the noise power of system, and Γ represents the amount of redundancy associated with physical level coded modulation, P _{rj, dt}and h _{rj, dt}represent the via node r preset _jwith destination node d _ttransmitted power when carrying out data communication and channel gain.

Concrete, described available free frequency spectrum set determination module 404 can comprise:

Second initial value arranges submodule, is 1 for arranging the second judgement initial value y;

Frequency spectrum judges submodule, for judging that whether the frequency spectrum f being designated y is only for the source node s of in described S _imeet the following conditions,

F ∈ F _siand f ∈ F _rsi;

First idle frequency spectrum determination submodule, for when described frequency spectrum judges the judged result of submodule for being, is defined as s by f _ielement in corresponding available free frequency spectrum set;

Source node determination submodule, for judging that the judged result of submodule is no at described frequency spectrum, determines the source node meeting above-mentioned condition from described S;

Signal-to-noise ratio to predict value prediction submodule, for predicting signal-to-noise ratio to predict value when destination node that via node in the alternative set of relay nodes through determining each source node obtained is corresponding with this source node carries out data communication;

Source node obtains submodule, for according to predicting the outcome, obtains the source node that maximum signal to noise ratio predicted value is corresponding;

Second idle frequency spectrum determination submodule, for being defined as the element in available free frequency spectrum set corresponding to obtained source node by f;

Second value upgrades submodule, is y+1 for upgrading the value of y;

Second value judges submodule, for judging whether y is greater than default frequency spectrum quantity, if being not more than, triggering described frequency spectrum and judging that submodule carries out frequency spectrum judgement.

Optionally, described signal-to-noise ratio to predict value prediction submodule, can specifically for according to following formula, predict signal-to-noise ratio to predict value when destination node that via node in the alternative set of relay nodes through determining each source node obtained is corresponding with this source node carries out data communication

Wherein, represent on frequency spectrum f, via node r _lwith destination node d _zcarry out signal-to-noise ratio to predict value during data communication, d _zfor the r determined according to data transfer demands _lthe destination node that corresponding source node is corresponding, N ₀w represents the noise power of system, and Γ represents the amount of redundancy associated with physical level coded modulation, P _{f, dz}and h _{f, dz}represent preset on frequency spectrum f, via node r _lwith destination node d _ztransmitted power when carrying out data communication and channel gain.

Concrete, described data transmission module 405 can comprise:

Idle frequency spectrum determination submodule, for source node s each from described S _if _asir is determined in the frequency spectrum comprised _siin the idle frequency spectrum of each via node that comprises;

Transfer of data submodule, for the idle frequency spectrum at each via node determined, by this via node to s _icorresponding destination node d _itransmission data.

As seen from the above, in the scheme that each embodiment above-mentioned provides, after determining that current time exists the source node set of data transfer demands, first for each via node in the set of relay nodes preset, obtain the corresponding alternative set of relay nodes of each source node in source node set, determine each source node and the common corresponding available free frequency spectrum set of alternative set of relay nodes thereof again, then each source node is in the available free frequency spectrum set of its correspondence, by the via node in its alternative set of relay nodes to its destination node transmission data.The situation of all via nodes in other source nodes of data transfer demands and default set of relay nodes is there is owing to considering synchronization in cooperative relay network when the available free frequency spectrum set determining each source node, so, apply scheme that each embodiment above-mentioned provides when carrying out transfer of data, can carry out in conjunction with the performance of whole network, and then can communication efficiency be improved.

For device embodiment, because it is substantially similar to embodiment of the method, so description is fairly simple, relevant part illustrates see the part of embodiment of the method.

It should be noted that, in this article, the such as relational terms of first and second grades and so on is only used for an entity or operation to separate with another entity or operating space, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.

One of ordinary skill in the art will appreciate that all or part of step realized in said method execution mode is that the hardware that can carry out instruction relevant by program has come, described program can be stored in computer read/write memory medium, here the alleged storage medium obtained, as: ROM/RAM, magnetic disc, CD etc.

The foregoing is only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.All any amendments done within the spirit and principles in the present invention, equivalent replacement, improvement etc., be all included in protection scope of the present invention.

Claims (10)

1., based on a data transmission method for cooperating relay and spectrum aggregating, it is characterized in that, described method comprises:

Determine that current time exists the source node S set of data transfer demands;

For each via node r in the set of relay nodes R preset _j, according to source node s each in described S _ithe destination node d of present position and correspondence thereof _ipresent position respectively with r _jservice range between relation, determine r _jfor the allocation strategy of source node, to r _jdistribute, and obtain each source node s in described S according to allocation result _icorresponding alternative set of relay nodes R _si, wherein, each source node allows to be existed the via node of multiple correspondence or to there is not the via node of correspondence; Each via node allows to exist a corresponding source node or there is not corresponding source node at the most;

According to the frequency spectrum perception algorithm preset, obtain each source node s in described S _iidle frequency spectrum set F _si, and s _icorresponding R _siidle frequency spectrum set F _rsi;

For each source node s in described S _i, according to F _siand F _rsi, determine s _iavailable free frequency spectrum set F _asi, wherein, a frequency spectrum only belongs to available free frequency spectrum set corresponding to a source node;

Each source node s in described S _iat its F _asion the frequency spectrum comprised, pass through R _siin the via node that comprises to s _icorresponding destination node d _itransmission data.

2. method according to claim 1, is characterized in that, each via node r in the described set of relay nodes R for presetting _j, according to source node s each in described S _ithe destination node d of present position and correspondence thereof _ipresent position respectively with r _jservice range between relation, determine r _jfor the allocation strategy of source node, to r _jdistribute, and obtain each source node s in described S according to allocation result _icorresponding alternative set of relay nodes R _si, comprising:

Arranging the first judgement initial value j is 1;

Judge via node r _jwhether the quantity that service range interior nodes is right equals 1, and wherein, a node centering comprises: a source node, and according to the destination node that the data transfer demands of this source node is determined;

If equal 1, by r _jdistribute to r _jthe source node of service range interior nodes centering;

If be not equal to 1, judge r _jwhether the quantity that service range interior nodes is right is greater than 1;

If be greater than, predict r respectively _jin service range, the source node of each node centering passes through r _jnetwork throughput predicted value when carrying out data communication with the destination node of this node centering, and by r _jdistribute to the source node that in above-mentioned result of calculation, maximum network throughput prediction value is corresponding;

The value upgrading j is j+1;

Judge whether j is greater than the quantity of included via node in described R;

If be not more than, return described judgement r _jwhether the quantity that service range interior nodes is right equals the step of 1;

Each source node s in described S is obtained according to allocation result _icorresponding alternative set of relay nodes R _si.

3. method according to claim 2, is characterized in that, describedly predicts r respectively _jin service range, the source node of each node centering passes through r _jnetwork throughput predicted value when carrying out data communication with the destination node of this node centering, comprising:

When relay cooperative communication pattern is decoding forward collaboration communication pattern, according to following formula, predict r respectively _jin service range, the source node of each node centering passes through r _jnetwork throughput predicted value when carrying out data communication with the destination node of this node centering,

$T_{rj,dt}={\mathrm{blog}}_2(1+\frac{P_{rj,dt}\×h_{rj,dt}}{{\mathrm{\ΓN}}_{0}W})$

Wherein, T _{rj, dt}represent s _tby via node r _jthe destination node d corresponding with it _tcarry out network throughput predicted value during data communication, s _trepresent r _jthe source node of any one node centering in service range, b represents the bandwidth of usable spectrum, N ₀w represents the noise power of system, and Γ represents the amount of redundancy associated with physical level coded modulation, P _{rj, dt}and h _{rj, dt}represent the via node r preset _jwith destination node d _ttransmitted power when carrying out data communication and channel gain.

4. method according to claim 1, is characterized in that, described for each source node s in described S _i, according to F _siand F _rsi, determine s _iavailable free frequency spectrum set F _asi, comprising:

Arranging the second judgement initial value y is 1;

Judge that whether the frequency spectrum f being designated y is only for the source node s of in described S _imeet the following conditions,

F ∈ F _siand f ∈ F _rsi;

If yes, f is defined as s _ielement in corresponding available free frequency spectrum set;

If NO, from described S, the source node meeting above-mentioned condition is determined; The destination node that via node in the alternative set of relay nodes of prediction through determining each source node obtained is corresponding with this source node carries out signal-to-noise ratio to predict value during data communication; According to predicting the outcome, obtain the source node that maximum signal to noise ratio predicted value is corresponding; F is defined as the element in available free frequency spectrum set corresponding to obtained source node;

The value upgrading y is y+1;

Judge whether y is greater than default frequency spectrum quantity;

If be not more than, return described judgement and whether be designated the frequency spectrum f of y only for the source node s of in described S _ithe step met the following conditions.

5. method according to claim 4, is characterized in that, the destination node that the via node in the alternative set of relay nodes of described prediction through determining each source node obtained is corresponding with this source node carries out signal-to-noise ratio to predict value during data communication, comprising:

According to following formula, predict signal-to-noise ratio to predict value when destination node that via node in the alternative set of relay nodes through determining each source node obtained is corresponding with this source node carries out data communication,

Wherein, Υ _{f, rl}represent on frequency spectrum f, via node r _lwith destination node d _zcarry out signal-to-noise ratio to predict value during data communication, d _zfor the r determined according to data transfer demands _lthe destination node that corresponding source node is corresponding, N ₀w represents the noise power of system, and Γ represents the amount of redundancy associated with physical level coded modulation, P _{f, dz}and h _{f, dz}represent preset on frequency spectrum f, via node r _lwith destination node d _ztransmitted power when carrying out data communication and channel gain.

6. method according to claim 1, is characterized in that, each source node s in described S _iat its F _asion the frequency spectrum comprised, pass through R _siin the via node that comprises to s _icorresponding destination node d _itransmission data, comprising:

Each source node s from described S _if _asir is determined in the frequency spectrum comprised _siin the idle frequency spectrum of each via node that comprises;

On the idle frequency spectrum of each via node determined, by this via node to s _icorresponding destination node d _itransmission data.

7., based on a data transmission device for cooperating relay and spectrum aggregating, it is characterized in that, described device comprises:

Source node set determination module, for determining that current time exists the source node S set of data transfer demands;

Alternative set of relay nodes obtains module, for for each via node r in the set of relay nodes R preset _j, according to source node s each in described S _ithe destination node d of present position and correspondence thereof _ipresent position respectively with r _jservice range between relation, determine r _jfor the allocation strategy of source node, to r _jdistribute, and obtain each source node s in described S according to allocation result _icorresponding alternative set of relay nodes R _si, wherein, each source node allows to be existed the via node of multiple correspondence or to there is not the via node of correspondence; Each via node allows to exist a corresponding source node or there is not corresponding source node at the most;

Idle frequency spectrum set obtains module, for according to the frequency spectrum perception algorithm preset, obtains each source node s in described S _iidle frequency spectrum set F _si, and s _icorresponding R _siidle frequency spectrum set F _rsi;

Available free frequency spectrum set determination module, for for each source node s in described S _i, according to F _siand F _rsi, determine s _iavailable free frequency spectrum set F _asi, wherein, a frequency spectrum only belongs to available free frequency spectrum set corresponding to a source node;

Data transmission module, for source node s each in described S _iat its F _asion the frequency spectrum comprised, pass through R _siin the via node that comprises to s _icorresponding destination node d _itransmission data.

8. device according to claim 7, is characterized in that, described alternative set of relay nodes obtains module, comprising:

First initial value arranges submodule, is 1 for arranging the first judgement initial value j;

First node judges submodule to quantity, for judging via node r _jwhether the quantity that service range interior nodes is right equals 1, and wherein, a node centering comprises: a source node, and according to the destination node that the data transfer demands of this source node is determined;

First via node distribution sub module, for when described first node judges the judged result of submodule for being to quantity, by r _jdistribute to r _jthe source node of service range interior nodes centering;

Section Point judges submodule to quantity, at described first node to when judging that the judged result of submodule is no, judge r _jwhether the quantity that service range interior nodes is right is greater than 1;

Second via node distribution sub module, for when described Section Point judges the judged result of submodule for being to quantity, predicts r respectively _jin service range, the source node of each node centering passes through r _jnetwork throughput predicted value when carrying out data communication with the destination node of this node centering, and by r _jdistribute to the source node that in above-mentioned result of calculation, maximum network throughput prediction value is corresponding;

First numerical value upgrades submodule, is j+1 for upgrading the value of j;

First numerical value judges submodule, for judging whether j is greater than the quantity of included via node in described R, if be not more than, trigger described first node and judges that submodule decision node is to quantity to quantity;

Alternative set of relay nodes obtains submodule, for obtaining each source node s in described S according to allocation result _icorresponding alternative set of relay nodes R _si.

9. device according to claim 7, is characterized in that, described available free frequency spectrum set determination module, comprising:

Second initial value arranges submodule, is 1 for arranging the second judgement initial value y;

Frequency spectrum judges submodule, for judging that whether the frequency spectrum f being designated y is only for the source node s of in described S _imeet the following conditions,

F ∈ F _siand f ∈ F _rsi;

First idle frequency spectrum determination submodule, for when described frequency spectrum judges the judged result of submodule for being, is defined as s by f _ielement in corresponding available free frequency spectrum set;

Source node determination submodule, for judging that the judged result of submodule is no at described frequency spectrum, determines the source node meeting above-mentioned condition from described S;

Signal-to-noise ratio to predict value prediction submodule, for predicting signal-to-noise ratio to predict value when destination node that via node in the alternative set of relay nodes through determining each source node obtained is corresponding with this source node carries out data communication;

Source node obtains submodule, for according to predicting the outcome, obtains the source node that maximum signal to noise ratio predicted value is corresponding;

Second idle frequency spectrum determination submodule, for being defined as the element in available free frequency spectrum set corresponding to obtained source node by f;

Second value upgrades submodule, is y+1 for upgrading the value of y;

Second value judges submodule, for judging whether y is greater than default frequency spectrum quantity, if being not more than, triggering described frequency spectrum and judging that submodule carries out frequency spectrum judgement.

10. device according to claim 7, is characterized in that, described data transmission module, comprising:

Idle frequency spectrum determination submodule, for source node s each from described S _if _asir is determined in the frequency spectrum comprised _siin the idle frequency spectrum of each via node that comprises;

Transfer of data submodule, for the idle frequency spectrum at each via node determined, by this via node to s _icorresponding destination node d _itransmission data.