CN107911824B - Dynamic spectrum allocation method and device - Google Patents
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Abstract
The invention discloses a dynamic spectrum allocation method and a device, wherein the dynamic spectrum allocation method comprises the following steps: dividing each transmission frame into a first sub-frame and a second sub-frame, and transmitting signals to all D2D users and cellular users, respectively, in the first sub-frame; in case that at least one D2D user successfully decodes the signal, selecting a D2D user from all the successfully decoded D2D users according to a preset selection rule, and in a second subframe, transmitting the signal to the cellular user through the selected D2D user; the cellular user combines the signal transmitted in the first subframe with the signal transmitted in the second subframe. Through the technical scheme, the invention performs transmission by the cooperation of the D2D users and the cellular users on the premise of ensuring the normal communication of the cellular users, and dynamically increases the spectrum resources allocated to the D2D users according to the obtained system gain, thereby more effectively utilizing the spectrum.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a dynamic spectrum allocation method and apparatus.
Background
D2D (Device-to-Device) communication is also called proximity discovery technology, and refers to a communication method in which when a terminal to be communicated is relatively close to a base station, the two terminals can establish a direct connection link under the control of the base station to perform data transmission, and this communication method not only can multiplex the frequency band of a cellular user in a spectrum sharing manner, but also can reduce the overhead burden caused by base station forwarding to a certain extent by direct connection of devices, thereby implementing green communication.
In the D2D communication, because the operator management charging rules are not agreed and other factors are difficult to lay alone at the present stage, the D2D communication is used in the existing cellular network to improve the spectrum utilization rate of the system, so that the spectrum resources can be effectively utilized, and the purpose of alleviating the phenomenon of spectrum resource scarcity can be achieved, for example, in the conventional scheme, a D2D user multiplexes a cellular user spectrum with a very small power, and low-power short-distance communication (Substrate D2D Transmission, abbreviated as SDT, D2D bottom layer Transmission) is performed in the system in a form similar to Substrate noise, but the spectrum utilization rate in the scheme in the prior art is low.
An effective solution to the problems in the related art has not been proposed yet.
Disclosure of Invention
The invention provides a dynamic spectrum allocation method and a dynamic spectrum allocation device, which can cooperate with cellular users to transmit through D2D users on the premise of ensuring normal communication of the cellular users, and dynamically increase spectrum resources allocated to D2D users according to the obtained system gain, so that the spectrum can be more effectively utilized.
The technical scheme of the invention is realized as follows:
according to one aspect of the invention, a method of dynamic spectrum allocation is provided.
The dynamic spectrum allocation method comprises the following steps: dividing each transmission frame into a first sub-frame and a second sub-frame, and transmitting signals to all D2D users and cellular users, respectively, in the first sub-frame; in case that at least one D2D user successfully decodes the signal, selecting a D2D user from all the successfully decoded D2D users according to a preset selection rule, and in a second subframe, transmitting the signal to the cellular user through the selected D2D user; the cellular user combines the signal transmitted in the first subframe with the signal transmitted in the second subframe.
According to an embodiment of the invention, the dynamic spectrum allocation method further comprises: in the case where all D2D users did not successfully decode the signal, the signal is retransmitted to the cellular user in the second subframe.
According to an embodiment of the invention, the dynamic spectrum allocation method further comprises: all D2D users are divided into multiple groups, and in case that at least one group of D2D users successfully decodes the signal, a D2D user is selected from the successfully decoded groups of D2D users according to a preset selection rule.
According to an embodiment of the present invention, selecting a D2D user from all D2D users whose decoding is successful according to a preset selection rule includes: among all the D2D users whose decoding was successful, the D2D user with the highest signal-to-noise ratio in communication with the cellular user was selected.
According to one embodiment of the invention, the first subframe and the second subframe are equal.
According to another aspect of the present invention, a dynamic spectrum allocation apparatus is provided.
The dynamic spectrum allocation device comprises: a transmitting module, configured to divide each transmission frame into a first subframe and a second subframe, and transmit signals to all D2D users and cellular users, respectively, in the first subframe; a selection transmitting module, configured to select a D2D user from all successfully decoded D2D users according to a preset selection rule in case that at least one D2D user successfully decodes the signal, and transmit the signal to the cellular user through the selected D2D user in a second subframe; and the combining module is used for combining the signal transmitted in the first subframe and the signal transmitted in the second subframe.
According to an embodiment of the present invention, the dynamic spectrum allocation apparatus further includes: and a retransmission module, configured to retransmit the signal to the cellular user in the second subframe if all D2D users have not successfully decoded the signal.
According to an embodiment of the present invention, the selecting and transmitting module is further configured to divide all D2D users into multiple groups, and select a D2D user from the multiple groups of D2D users successfully decoded according to a preset selection rule if at least one group of D2D users successfully decodes the signal.
According to one embodiment of the invention, the selecting and sending module comprises: a selection sub-module for selecting among all the successfully decoded D2D users, the D2D user with the highest signal-to-noise ratio in the communication with the cellular user.
According to one embodiment of the invention, the first subframe and the second subframe are equal.
The invention has the beneficial technical effects that:
the invention divides each transmission frame into a first sub-frame and a second sub-frame, and respectively sends signals to all D2D users and cellular users in the first sub-frame, then selects one D2D user from all D2D users successfully decoding according to a preset selection rule under the condition that at least one D2D user successfully decodes the signals, and sends the signals to the cellular users through the selected D2D user in the second sub-frame, and finally the cellular users combine the signals sent in the first sub-frame and the signals sent in the second sub-frame, thereby cooperating the cellular users to transmit through the D2D users on the premise of ensuring the normal communication of the cellular users, and dynamically increasing the spectrum resources allocated to the D2D users according to the obtained system gain, thereby enabling the spectrum to be more effectively utilized.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a flow chart of a dynamic spectrum allocation method according to an embodiment of the invention;
fig. 2 is a schematic diagram of a variation of the number of users accessing D2D through a conventional scheme;
fig. 3 is a schematic diagram of the variation of the number of users accessing D2D by the technical solution of the present invention;
fig. 4 is a variation diagram of the maximized number of accessible D2D users achieved by the conventional scheme and the technical scheme of the present invention;
fig. 5 is a diagram illustrating a variation of spectrum utilization achieved by the conventional scheme and the technical scheme of the present invention;
fig. 6 is a block diagram of a dynamic spectrum allocation apparatus according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
According to an embodiment of the present invention, a method for dynamic spectrum allocation is provided.
As shown in fig. 1, a dynamic spectrum allocation method according to an embodiment of the present invention includes: step S101, dividing each transmission frame into a first sub-frame and a second sub-frame, and respectively sending signals to all D2D users and cellular users in the first sub-frame; step S103, under the condition that at least one D2D user successfully decodes the signal, selecting a D2D user from all D2D users successfully decoded according to a preset selection rule, and in a second subframe, sending the signal to a cellular user through the selected D2D user; step S105, the cellular user combines the signal transmitted in the first sub-frame and the signal transmitted in the second sub-frame.
In this embodiment, the dynamic spectrum allocation method according to the embodiment of the present invention includes: step S1, transmitting each frame tkDivided into two equal sub-frames, defined as tk，1And tk，2In the first sub-frame tk，1In, cellular base station E downlink transmission signal xEAll D2D users in the system are given DTi (0 < i < M, and i is a positive integer) and cellular users P; step S2, if the D2D user DTi succeeds in aligning the signal xEDecoding, selecting the user with the highest signal-to-noise ratio from the cellular users P; step S3, at tk，2In the selection step S2, the D2D user with the highest signal-to-noise ratio will select the signal xETransmitting to cellular user P; in step S4, if none of the D2D users DTi match the signal xEDecoding succeeds, at tk，2In the method, the cellular base station E wants to retransmit the signal xETransmitting to cellular user P; step S5, at cellular user (or receiving end) P, adopting maximal ratio combining method and combining tk，1And tk，2Of the signal of (1). Thus, the same signal x is transmitted as D2D user assisting cellular user PEThe data is transmitted to the target user P through different paths, which inevitably brings certain diversity gain to the system and improves the overall performance of the system. Meanwhile, due to the addition of the D2D user, certain interference is brought to the cellular user in the system, the diversity gain can cancel part of the interference, and the D2D user obtains more frequency spectrum allocated by the system while the gain and the interference are cancelled each other, so that the D2D communication can be performed. Therefore, by the cooperative transmission in the manner, the spectrum resources are more reasonably allocated, and the spectrum utilization rate of the system is effectively improved.
By means of the technical scheme of the invention, each transmission frame is divided into a first sub-frame and a second sub-frame, signals are respectively sent to all D2D users and cellular users in the first sub-frame, then, in the case that at least one D2D user successfully decodes the signals, a D2D user is selected from all D2D users successfully decoded according to a preset selection rule, in the second sub-frame, the signals are sent to the cellular users through the selected D2D user, and finally, the cellular users combine the signals sent in the first sub-frame and the signals sent in the second sub-frame, so that the D2D users cooperate with the cellular users to carry out transmission on the premise of ensuring normal communication of the cellular users, and the spectrum resources allocated to the D2D users are dynamically increased by the obtained system gain, and therefore, the spectrum is more effectively utilized.
According to an embodiment of the invention, the dynamic spectrum allocation method further comprises: in the case where all D2D users did not successfully decode the signal, the signal is retransmitted to the cellular user in the second subframe.
According to an embodiment of the invention, the dynamic spectrum allocation method further comprises: all D2D users are divided into multiple groups, and in case that at least one group of D2D users successfully decodes the signal, a D2D user is selected from the successfully decoded groups of D2D users according to a preset selection rule.
According to an embodiment of the present invention, selecting a D2D user from all D2D users whose decoding is successful according to a preset selection rule includes: among all the D2D users whose decoding was successful, the D2D user with the highest signal-to-noise ratio in communication with the cellular user was selected.
According to one embodiment of the invention, the first subframe and the second subframe are equal.
In order to better describe the technical solution of the present invention, the following detailed description is made by specific examples.
In the technical scheme of the invention, E represents a cellular base station, P represents a cellular mobile phone user (or a cellular user), DTi–DRiRepresents the ith D2D transmitter-receiver pair, where i is 1, …, N, i.e., i is a positive integer. At the same time, assume that cellular base station E transmits signal xETo cellular user P, power is PEThe data transmission rate is RE. D2D transmitter DTi transmission signal xDTTo receiver DRiThe power is PDTAnd the data transmission rate is R. For ease of analysis, it is further assumed that the transmission powers of the D2D transmitters are equal to each other, i.e., PDT1＝……＝PDTi＝PD. In addition, with YiIndicating the signal received at point i, by PoutIndicating the probability of interruption, PXIndicating the probability of X occurrence.
Further, in general, it is assumed that the D2D user shares network resources with the cellular mobile phone user P. Thus, D2D transmissions may interfere with cellular transmissions. In order to solve the above problem, power control is required in the D2D system, and as long as the requirement of QoS (Quality of Service) between the D2D user and the cellular phone user is satisfied, a plurality of D2D pairs may occupy the channel at the same time. However, the problem is that in conventional schemes, if the number of access D2D pairs is increased, the interference to cellular transmissions will also increase significantly. To solve this problem, the solution of the present invention is proposed to make D2D users get access opportunity by assisting cellular transmission, and at the same time, the present invention quantifies QoS with performance outage probability, i.e. the outage probability of the data link should be kept at or below a given threshold, as follows:
in the conventional scheme, the first K (0 ≦ K ≦ N) D2D users may be allowed to share the spectrum occupied by cellular user P on the premise of guaranteeing the QoS requirements of the first K D2D users, because the QoS of cellular users cannot be guaranteed if the number of D2D users is increased once more. In this case, K D2D users and cellular phone users, during a time period tkAlso, signals may be transmitted simultaneously. Due to the limitation of the QoS of the cellular user, the number of the D2D users is very limited under the premise of not interfering the cellular user, and the spectrum utilization rate of the system cannot be fundamentally improved.
In the inventive scheme, the first M (0 ≦ M ≦ N) D2D transmitters are allowed to assist cellular transmission for cellular user P in exchange for a portion of the spectrum to apply to the D2D transmission. While the D2D user brings interference to the system, the cooperative transmission of the D2D user also brings considerable diversity gain to the system, so as to cancel the interference brought to the system, which specifically includes the following procedures:
firstly, each time period t is divided intokDivided into two equal sub-frames, defined as tk，1And tk，2And in the first sub-frame tk，1In, cellular base station E propagates signal xEAfter giving D2D transmitter DTi and cellular user P, the D2D transmitter successfully pairs with signal xEDecoding, selecting the user with the highest signal-to-noise ratio among the cellular users P, at tk，2In (1), it is selected to be the signal xETo cellular user P. If found at tk，1All M D2D transmitters cannot be paired with signal xEDecoding is carried out at tk，2The middle cellular base station E will retransmit tk，2To cellular user P. Here, the D2D transmitter employs a decode and forward protocol, and cellular user P employs a maximum ratio combining method, incorporating tk，1And tk，2Of the signal of (1). D2D user-assisted cellularAnd transmitting, wherein the cellular base station E releases the frequency band of the cellular frequency spectrum of the part 1-beta to the D2D user as long as the QoS in the P can be ensured, and the frequency bandwidth of the P end is assumed to be W, wherein beta is more than or equal to 0 and less than or equal to 1. Meanwhile, the frequency spectrum released here is further divided into K sub-channels with the same frequency bandwidth, including the first K D2D users and each of the following D2D pairs, all at different tkOperating in sub-channels, this means that the transmitter of D2D can both cooperate with cellular signals for transmission and transmit its own signals in the newly proposed scheme, since it uses different frequency bands. Particularly, it can be easily implemented in the transmitter of D2D, because such transmitters are generally equipped with multiple radio access technologies.
In order to better describe the beneficial effect of the technical solution of the present invention compared to the prior art SDT, the following performs a related analysis through a simulation result.
First, assume that the heterogeneous wireless network is in a 500m × 500m square area, where cellular base station E is located at the center of this area. The number of all available D2D user pairs is N60, and the distance 200m from the cellular base station E is the cellular user P it receives, set to the separation distance D between the cellular user P and the cellular base stationE，C200 m. Meanwhile, for the D2D pair in the randomly placed square area, the maximum distance between each D2D transmitter and the receiver setting is 20M, in addition, the number of cooperating D2D transmitters is M-2, the path loss is set to a constant value of c-0.8, the path loss index is α -4, the bandwidth of the cellular link E-P is W-1 MHz (MHz), the power spectral density of AWGN (Additive White Gaussian Noise) is 4.0 × 10-21W/Hz, and the power budget of each D2D transmitter is Po＝PDC+PDD10dBm, where PDCFor cooperative power of D2D transmitter, PDDD2D power for D2D transmitter.
Furthermore, as shown in fig. 2, in the conventional scheme, it is simulated that the number of accessible D2D users varies with the power P of the transmitterDThe data transmission rate is RE＝RDTi0.1bits/s/Hz (spectral efficiency)) The interruption probability threshold is rhoP＝ρD＝0.08。
First, in the conventional scheme, the number of accessible D2D users corresponds to the power P of the D2D transmitterDIn which the abscissa P is as shown in FIG. 2DIs the transmission power of the D2D transmitter, and SDT with PE400dBM means that in the prior art solution, the cellular base station E transmits a signal xEPower to cellular user P is 400dBM, SDT with PE200dBM denotes the transmission signal x of the cellular base station E in the prior art solutionEThe power to cellular user P is 200dBM, it can be seen that two broken lines are simulated corresponding to different cellular base station transmitting powers, the variation trend of the two broken lines is the same, when the power of D2D transmitter is smaller, because of the limit of the minimum transmitting power requirement between D2D users, the number of D2D users accessing the system is smaller, and as the power of D2D transmitter increases, when the required power between D2D is satisfied, the system will allow more and more D2D users to join the system, and the broken line shows the rising trend. However, as the number of D2D users increases, more and more interference is inevitably brought to the system, and the number of D2D users allowed to access reaches the maximum value under the QoS limit of cellular users, and then the power of the D2D transmitter increases, and the trend is reduced. The simulation effect is consistent with the theoretical research in the previous subsection.
In addition, as shown in FIG. 3, wherein the abscissa PDCIs the cooperative power of the D2D transmitter, and CDT with PE300dBM indicates that in the solution of the invention, the cellular base station E transmits the signal xEPower to cellular user P is 300dBM, CDT with PE200dBM indicates that in the solution according to the invention, the cellular base station E transmits a signal xEThe power to the cellular user P is 200dBM, and in the technical scheme of the invention, the number of the accessible D2D users in the simulation is along with the cooperative power PDCThe data rate is RE＝RDTi0.2bits/s/Hz, the interruption probability threshold is pP＝10-6And ρD＝10-3。
As can be seen from fig. 3, as the power used by the D2D users for transmission by cooperating cellular mobile users increases, and the frequency spectrum exchanged back for the D2D users for data transmission increases, the number of D2D users accessible to the cellular network also increases, but when the interference effect caused by the addition of the D2D users is greater than the diversity gain effect caused to the cellular mobile users, the number of D2D users accessible to the system tends to decrease. Accordingly, the cooperative power of the D2D transmitter may be adjusted to maximize the D2D user pairs that may access the cellular network.
It is also worth noting that in the conventional scheme, in the case of large base station transmission power, the number of D2D users accessing the cell cannot be further maximized by increasing the base station transmission power. In fig. 2, the maximum number of D2D users allowed to access by the system is the same under different base station transmission power. Only for different base station transmission power PEWhen the number of D2D users reaches the maximum value, the required transmit power of D2D users is different. However, the increase of the transmission power of the base station or the transmission power of the D2D transmitter requires the simultaneous increase of the corresponding opposite party's power to ensure the balance of the system signal-to-interference ratio, so the conventional scheme cannot increase the number of D2D users that can access the system by increasing the transmission power of the base station under the condition that the transmission power of the base station is large. However, the technical solution of the present invention obviously improves the transmission performance of the cellular network by increasing the transmission power of the base station, and thus, may be regarded as an enhancement to the D2D cooperative transmission to some extent, so that the conventional solution may increase the number of D2D users that can access the cellular network by increasing the transmission power of the base station. The solution of the invention performs better than the conventional solution.
Furthermore, as shown in FIG. 4, wherein the abscissa PETransmitting a signal x for a cellular base station EEPower to cellular user P, and SDT with ρP＝ρD0.001 indicates that in the prior art solution, the outage probability threshold is 0.001, CDT with ρP＝ρD0.001 indicates that the interruption probability threshold is 0.0 in the solution of the present invention01，SDT withρP＝ρD0.08 indicates that in the prior art solution, the outage probability threshold is 0.08, CDT with ρP＝ρD0.08 indicates that in the technical solution of the present invention, the threshold value of the outage probability is 0.08, and in the conventional method and the technical solution of the present invention, the maximum number of accessible D2D users is simulated according to the transmission power P of the base stationEGraph of variation, where the data rate is PD＝PDC0dBm and RE＝RDTi＝0.2bits/s/Hz。
In addition, simulation of fig. 4 illustrates the maximized number of D2D users that can access the cellular network in the conventional scheme and the technical scheme of the present invention. As is apparent from fig. 4, the conventional scheme can effectively increase the number of D2D users that can access the cellular network compared with the technical scheme of the present invention. In the conventional scheme, at a lower PEIn a region, no D2D user can access the cellular spectrum, while the technical scheme of the invention can access part of D2D users and can cooperate with the cellular to carry out transmission. Meanwhile, in the conventional scheme, high PEThe maximum number of accessible D2D users will remain a constant value, as shown in fig. 2. However, in the technical solution of the present invention, when the base station transmits power PEAt higher, the amount of spectrum that can be released increases due to cooperative cellular transmission, and therefore the maximum number of accessible cells for D2D users also increases as the PE increases. Finally, as expected, in the conventional scheme and the technical scheme of the present invention, the maximum accessible D2D user number can be varied with the base station transmission power PEIs increased.
As shown in fig. 5, wherein the abscissa PETransmitting a signal x for a cellular base station EEPower to cellular user P, and SDT with ρP＝ρD0.001 indicates that in the prior art solution, the outage probability threshold is 0.001, CDT with ρP＝ρD0.001 represents that in the technical scheme of the present invention, the threshold value of the interruption probability is 0.001, and in the conventional scheme and the technical scheme of the present invention, the spectrum utilization rate is simulated along with the transmission power P of the base stationEOf variationGraph of data transmission rate PD＝PDC0dBm and RE＝RDTi0.2 bits/s/Hz. Fig. 5 is a study of the relationship between the transmission power of the cellular system and the utilization rate of the system spectrum according to the technical solution of the present invention, and compares the relationship with the conventional solution. In single cell transmission, if a given quality of service QoS needs to be met, more D2D users that can access the cell are needed to guarantee higher spectrum utilization. Therefore, the spectrum utilization defined herein corresponds to the number of accessible D2D users, i.e., the spectrum resources allocated to D2D users, whose applicability is for all D2D users. It is observed in fig. 5 that the technical solution of the present invention significantly improves the spectrum utilization compared to the conventional solution. In addition, compared with the traditional scheme, the technical scheme of the invention can achieve higher system frequency spectrum utilization rate under lower base station transmitting power, and the newly accessed D2D user can not only cooperate with the honeycomb to carry out data transmission, but also cover the blind area of the honeycomb to a certain extent. The above two points can both reduce the energy consumption of the base station and meet the requirement of green communication.
According to an embodiment of the invention, a dynamic spectrum allocation device is also provided.
As shown in fig. 6, the dynamic spectrum allocation apparatus according to the embodiment of the present invention includes: a transmitting module 61, configured to divide each transmission frame into a first subframe and a second subframe, and transmit signals to all D2D users and cellular users, respectively, in the first subframe; a selective transmission module 62, configured to select a D2D user from all the successfully decoded D2D users according to a preset selection rule in case that at least one D2D user successfully decodes the signal, and transmit the signal to the cellular user through the selected D2D user in the second subframe; and a combining module 63, configured to combine the signal sent in the first subframe and the signal sent in the second subframe.
According to an embodiment of the present invention, the dynamic spectrum allocation apparatus further includes: a retransmission module (not shown) for retransmitting the signal to the cellular user in the second subframe if all D2D users did not successfully decode the signal.
According to an embodiment of the present invention, the selecting and transmitting module 62 is further configured to divide all D2D users into multiple groups, and select a D2D user from the multiple groups of D2D users successfully decoded according to a preset selection rule if at least one group of D2D users successfully decodes the signal.
According to one embodiment of the invention, the selecting and sending module comprises: a selection sub-module (not shown) is used to select the D2D user with the highest signal-to-noise ratio in the communication with the cellular user, among all the D2D users whose decoding is successful.
According to one embodiment of the invention, the first subframe and the second subframe are equal.
In summary, by means of the above technical solution of the present invention, by dividing two subframes, if a D2D user successfully decodes, a D2D user performs transmission in cooperation with a cellular user to obtain more spectrum resources, and if a D2D user does not successfully decode, a cellular second time signal transmission is performed to the cellular user, so as to generate diversity gain, thereby increasing the access number of D2D users, that is, more spectrum resources are allocated to the D2D user, and if a D2D user successfully decodes, a pair of D2D users with the largest signal-to-noise ratio is selected to perform cooperative transmission, which not only improves the reliability of the system, but also avoids interference caused by too many D2D users to the system. In addition, the D2D users cooperate with the cellular users to perform transmission, so that the transmission power of the base station is saved to a certain extent, the requirement of green communication is met, the transmission power of the base station is adjusted, the spectrum resources allocated to the D2D users are expanded, and the power of the D2D transmitter is adjusted, so that the number of the D2D users (the spectrum resources allocated to the D2D users) accessing the cellular network is flexibly controlled, and the requirements of different application situations are met.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A method for dynamic spectrum allocation, comprising:
dividing each transmission frame of a frequency spectrum into a first subframe and a second subframe, and transmitting signals to all D2D users and cellular users, respectively, in the first subframe;
in case that at least one D2D user successfully decodes the signal, selecting a D2D user from all successfully decoded D2D users according to a preset selection rule, and in the second subframe, transmitting the signal to the cellular user through the selected D2D user;
the cellular user combines the signal transmitted in the first subframe and the signal transmitted in the second subframe.
2. The dynamic spectrum allocation method of claim 1, further comprising:
in the case where all D2D users did not successfully decode the signal, the signal is retransmitted to the cellular user in the second subframe.
3. The dynamic spectrum allocation method of claim 1, further comprising:
all D2D users are divided into multiple groups, and in case that at least one group of D2D users successfully decodes the signal, a D2D user is selected from the successfully decoded groups of D2D users according to a preset selection rule.
4. The dynamic spectrum allocation method of claim 3, wherein selecting a D2D user from all D2D users with successful decoding according to a preset selection rule comprises:
among all the D2D users whose decoding was successful, the D2D user with the highest signal-to-noise ratio in the communication with the cellular user is selected.
5. The dynamic spectrum allocation method of claim 1, wherein the first subframe and the second subframe are equal.
6. A dynamic spectrum allocation apparatus, comprising:
a sending module, configured to divide each transmission frame of a frequency spectrum into a first subframe and a second subframe, and send signals to all D2D users and cellular users, respectively, in the first subframe;
a selective transmission module, configured to select a D2D user from all the successfully decoded D2D users according to a preset selection rule if at least one D2D user successfully decodes the signal, and transmit the signal to the cellular user through the selected D2D user in the second subframe;
a combining module, configured to combine the signal sent in the first subframe and the signal sent in the second subframe.
7. The dynamic spectrum allocation device of claim 6, further comprising:
a re-sending module, configured to re-send the signal to the cellular user in the second subframe if all D2D users have not successfully decoded the signal.
8. The dynamic spectrum allocation device of claim 6, wherein the selective transmission module is further configured to divide all D2D users into multiple groups, and select a D2D user from the successfully decoded multiple groups of D2D users according to a preset selection rule if at least one group of D2D users successfully decodes the signal.
9. The dynamic spectrum allocation device of claim 8, wherein the means for selectively transmitting comprises:
a selection sub-module for selecting among all successfully decoded D2D users, the D2D user with the highest signal-to-noise ratio in communication with the cellular user.
10. The dynamic spectrum allocation device of claim 6, wherein the first subframe and the second subframe are equal.
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