WO2015062034A1

WO2015062034A1 - Resource allocation method and device, and user equipment

Info

Publication number: WO2015062034A1
Application number: PCT/CN2013/086340
Authority: WO
Inventors: 李宏超; 周华
Original assignee: 富士通株式会社; 李宏超; 周华
Priority date: 2013-10-31
Filing date: 2013-10-31
Publication date: 2015-05-07

Abstract

Provided are a resource allocation method and device, and a user equipment. The resource allocation method comprises: allocating a frequency band resource in unis of logical resource block to a cellular user equipment; receiving channel state information on the logical resource block sent by a D2D user equipment; and according to the obtained channel state information, a performance threshold value allowed to be lost by the cellular user equipment and the frequency band resource allocated to the cellular user equipment, adjusting a transmission power allowed to be used on the logical resource block by the D2D user equipment. By means of the embodiments of the present invention, a good transmission environment between adjacent communication pairs can be made full use of, and at the same time, the influence on a traditional cellular network can be effectively limited, thereby increasing the utilization rate of a frequency band and improving the overall performance of a system.

Description

Resource allocation method, device and user equipment

The present invention relates to the field of communications, and in particular, to a resource allocation method, apparatus, and user equipment for point-to-point (D2D) device communication. Background technique

With the rapid popularization of intelligent terminals and the rapid development of network applications, users' demands for system capacity and service quality in wireless access networks are constantly increasing. It is worth mentioning that with the popularity of large video sites such as Y _0U T _U be, Youku, Sohu, etc., streaming media has gradually become the mainstream business type in user data.

However, the band resources possessed by mobile communication systems are increasingly scarce: at the World Wireless Communications Conference in 2007, only less than 600 MHz of band resources were allocated to mobile communication systems. However, according to ITU-R estimates, by 2020, the demand for band resources will reach 1280MHz to 1720MHz. In addition, with the change of various modes such as work and consumption, especially with the development and deployment of the Internet of Things, the business needs based on geographical proximity continue to increase, which will greatly increase the distribution and proportion of near-field communication in the system. In the case where more spectrum resources are temporarily unavailable, it is imperative to make better use of existing radio resources.

D2D communication is proposed to optimize resource utilization and improve overall system performance. It is a new type of wireless communication mode: in its mode, the data link is established between communication pairs, unlike in the traditional communication mode, the base station (or eNodeB in LTE/LTE-A) needs to be used as a transit point. . According to the specific implementation mechanism of the point-to-point communication, the communication parties may need to exchange certain signaling information with the base station, thereby implementing control and management of the point-to-point communication link on the base station side.

By multiplexing the uplink frequency band resources of the system, D2D communication can utilize a good wireless communication environment between adjacent communication pairs, and exchange the lower resource consumption for the quality of service required by the user. Reasonable introduction of D2D communication into the LTE cellular network not only improves the transmission performance of the user equipment, increases the system capacity, but also mitigates the co-channel interference in the small interval, and improves the power efficiency of the user equipment and the frequency band utilization of the system. In addition, D2D communication significantly reduces the transmission delay of the link and effectively shares the processing load of the system. The above advantages of D2D communication have great potential in optimizing the performance of LTE cellular networks, and also create the possibility of providing new communication services.

In addition, D2D communication can also serve public safety applications and certain commercial uses. Establish a communication connection directly between user devices, making communication in certain special scenarios (rescue, fire, etc.) in extreme situations Still can work. For example, after a disaster, the base station may not work properly in part or in whole. The discovery of neighboring user devices can also serve public safety and some commercial uses, such as rescue, advertising, social networking, and other Internet applications.

It should be noted that the above description of the technical background is only for the purpose of facilitating the clear and complete description of the technical solutions of the present invention, and is convenient for understanding by those skilled in the art. The above technical solutions are not considered to be well known to those skilled in the art simply because these solutions are set forth in the background section of the present invention. Summary of the invention

However, the inventors found that existing wireless resource allocation schemes have certain deficiencies for the two-layer heterogeneous network scenario of traditional cellular networks and D2D communications.

First, in the radio resource allocation of D2D communication, the existing ideas include: The overall system throughput is optimized. Analyze the global benefits brought by D2D communication to the system under the three resource reuse modes (orthogonal resource multiplexing mode, non-orthogonal resource multiplexing mode and cellular communication mode), in the scenario of single cell and single interference user equipment pair Find the optimal band resource reuse mode. As a result, the impact of D2D communication on traditional cellular systems is not evaluated. It is possible to replace the traditional cellular performance in exchange for the overall performance improvement, ignoring the purpose and original intention of the initial introduction of D2D communication.

Secondly, some documents use D2D user location information to plan a D2D communication mode user equipment (hereinafter referred to as D user equipment or D2D user equipment) and a traditional cellular communication mode user equipment (hereinafter referred to as C user equipment or cellular user equipment). Resource reuse method. With the location information of the D user equipment and the C user equipment, the base station (eNodeB) selects a C user equipment that is far away from the specific D user equipment to multiplex the frequency band resources, thereby improving the transmission performance of the D user equipment and reducing the complex The cross-layer interface of the C user equipment is used. However, the above scheme does not fully consider the random variation characteristics of the radio link, and there is no certain mapping relationship between the communication distance and the interference strength, which greatly reduces the algorithm. Practicality.

In addition, some documents mention the band resource allocation scheme independently selected by the D user equipment, that is, with the assistance of the base station, the D user equipment obtains the information of its surrounding C user equipment and its corresponding frequency band resource usage, and the D user equipment passes The integration and processing of interference information effectively avoids interference with cellular user equipment. However, the above solution greatly increases the signaling and delay overhead of the system, which offsets the performance advantages of the algorithm.

The embodiment of the invention provides a resource allocation method, device and user equipment. Multiplexed communication in D2D communication In the scenario of the uplink frequency band resources of the cellular network, the good transmission environment between the adjacent communication pairs is fully utilized, and the impact on the traditional cellular network is effectively limited, the frequency band utilization is increased, and the overall performance of the system is improved.

According to an aspect of the embodiments of the present invention, a resource allocation method is provided, where the resource allocation method includes: allocating, to a cellular user equipment, a frequency band resource in units of logical resource blocks;

Receiving channel state information on a logical resource block sent by the D2D user equipment;

Adjusting, according to the obtained channel state information, the performance threshold value of the cellular user equipment, and the frequency band resource allocated by the cellular user equipment, adjusting the transmit power allowed by the D2D user equipment on the logical resource block. .

According to another aspect of the embodiments of the present invention, a resource allocation method is provided, where the resource allocation method includes:

The D2D user equipment measures channel state information on the logical resource block between the D2D communication pair; and transmits the measured channel state information on the logical resource block to the base station or the central control user equipment. According to another aspect of the embodiments of the present invention, a resource allocation apparatus is provided, where the resource allocation apparatus includes:

a resource allocation unit, which allocates a frequency band resource in a logical resource block unit to the cellular user equipment; an information receiving unit that receives channel state information on a logical resource block sent by the D2D user equipment; and a power adjustment unit, according to the obtained channel state information, And a performance threshold value that is tolerated by the cellular user equipment and a frequency band resource allocated by the cellular user equipment, and adjusting a transmit power that is allowed to be used by the D2D user equipment on the logical resource block.

According to another aspect of the embodiments of the present invention, a user equipment is provided, where the user equipment forms a D2D communication pair with other user equipments, where the user equipment includes:

The information measuring unit measures channel state information on the logical resource block between the D2D communication pair; the information sending unit sends the channel state information on the measured logical resource block to the base station or the central control user equipment.

According to another aspect of an embodiment of the present invention, there is provided a communication system comprising the resource allocation apparatus as described above and a user equipment.

According to still another aspect of an embodiment of the present invention, a computer readable program is provided, wherein when the program is executed in a base station or a central control user equipment, the program causes a computer to execute in the base station or the central control user equipment The resource allocation method as described above. According to still another aspect of an embodiment of the present invention, a storage medium storing a computer readable program, wherein the computer readable program causes a computer to perform a resource allocation method as described above in a base station or a central control user equipment.

According to still another aspect of an embodiment of the present invention, a computer readable program is provided, wherein when the program is executed in a user device, the program causes a computer to execute a resource allocation method as described above in the user device.

According to still another aspect of an embodiment of the present invention, a storage medium storing a computer readable program, wherein the computer readable program causes a computer to perform a resource allocation method as described above in a user equipment.

The beneficial effects of the embodiments of the present invention are: by using a D2D user equipment to assist a base station or a central control user equipment allocation manner, the base station or the central control user equipment collects channel state information between D2D communication pairs, and affects the performance of the cellular user equipment. The constraint and the frequency band allocation result of the cellular user equipment adjust the transmit power of the D2D user equipment. It can make full use of the good transmission environment between adjacent communication pairs, effectively limit the impact on traditional cellular networks, increase the frequency band utilization and improve the overall performance of the system.

Specific embodiments of the present invention are disclosed in detail with reference to the following description and drawings, which illustrate the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the invention are not limited in scope. The embodiments of the present invention include many variations, modifications, and equivalents within the spirit and scope of the appended claims.

Features described and/or illustrated with respect to one embodiment may be used in the same or similar manner in one or more other embodiments, in combination with, or in place of, features in other embodiments. .

It should be emphasized that the term "comprising", when used herein, refers to the presence of a feature, component, step or component, but does not exclude the presence or addition of one or more other features, components, steps or components.

DRAWINGS

Many aspects of the invention can be better understood with reference to the following drawings. The components in the figures are not drawn to scale, but only to illustrate the principles of the invention. In order to facilitate the illustration and description of some parts of the invention, the corresponding parts in the drawings may be enlarged or reduced.

Elements and features described in one of the figures or one embodiment of the invention may be combined with elements and features illustrated in one or more other figures or embodiments. In the accompanying drawings, like reference numerals refer to the 1 is a schematic diagram of a scenario in which a D2D user equipment generates a large cross-layer interference to a cellular user equipment; FIG. 2 is a schematic diagram of a scenario in which a cellular user equipment generates a large cross-layer interference to a D2D user equipment; FIG. 3 is a resource allocation according to an embodiment of the present invention. A schematic diagram of a process;

4 is another schematic flowchart of a resource allocation method according to an embodiment of the present invention;

FIG. 5 is another schematic flowchart of a resource allocation method according to an embodiment of the present invention; FIG.

6 is a schematic structural diagram of a resource allocation apparatus according to an embodiment of the present invention;

7 is a schematic structural diagram of a user equipment according to an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a communication system according to an embodiment of the present invention; FIG.

Figure 9 is a schematic diagram of the CDF curve of the D user equipment transmitting power when the system load is (4, 2); Figure 10 is a schematic diagram of the transmission rate of the two types of user equipment with time when the system load is (4, 2);

Figure 11 is a schematic diagram of the CDF curve of the D user equipment transmitting power when the system load is (6, 4); Figure 12 is a schematic diagram of the transmission rate of the two types of user equipment with time when the system load is (6, 4);

Figure 13 is a schematic diagram of the CDF curve of the D user equipment transmitting power when the system load is (8, 6); Figure 14 is a schematic diagram of the transmission rate of the two types of user equipment with time when the system load is (8, 6);

Figure 15 is a schematic diagram of the CDF curve of the D user equipment transmit power when the system load is (10, 8); Figure 16 is the graphical representation of the change of the transmission rate of the two types of user equipment over time when the system load is (10, 8)

Detailed ways

The foregoing and other features of the invention will be apparent from the The specific embodiments of the present invention are disclosed in the specification and the drawings, which are illustrated in the embodiments of the invention The invention includes all modifications, variations and equivalents falling within the scope of the appended claims.

1 is a schematic diagram of a scenario in which a D2D user equipment generates a large cross-layer interference to a cellular user equipment. FIG. 2 is a schematic diagram of a scenario in which a cellular user equipment generates a large cross-layer interference to a D2D user equipment. As shown in Figures 1 and 2, C-TX represents the C user equipment, D-TX represents the transmitting end of the D2D communication pair, and D-RX represents the D2D communication pair. In the receiving end, eBodeB represents a base station in an LTE or LTE-A radio access system.

In the design of radio resource allocation scheme for D2D communication, it is necessary to clarify the meaning and purpose of D2D communication introduction. On the one hand, in combination with the adjustment of the transmit power of the D user equipment, the D-user equipment is provided with a high-quality transmission service by utilizing the good wireless channel environment between the adjacent communication pairs, thereby avoiding the D user equipment in FIG. 1 being strongly interfered by the C user equipment.

On the other hand, due to the uplink frequency band resources of D2D communication and the traditional cellular network multiplexing system, there must be a certain compromise between the performance of the two communication layers. Therefore, D2D communication needs to limit the impact on the traditional cellular network, ensuring that both communication layers can effectively perform their respective functions, and avoid the D user equipment in Figure 2 from causing strong interference to the C user equipment.

In addition, considering the random characteristics of the wireless channel and the limited power reserve of the user terminal, the radio resource allocation scheme of the D2D communication should obtain reliable radio channel information from the UE, and assist the more powerful computing base to obtain a reasonable allocation result. Example 1

The embodiment of the present invention provides a resource allocation method, which may be applied to a base station side, or may be applied to a central control user equipment, and the present invention is not limited thereto. For convenience of explanation, the following only takes the base station as an example, and the case of using the center to control the user equipment is similar.

FIG. 3 is a schematic flowchart of a resource allocation method according to an embodiment of the present invention. As shown in FIG. 3, the resource allocation method includes:

Step 301: The base station allocates a frequency band resource in a logical resource block unit to the cellular user equipment. Step 302: The base station receives channel state information on the logical resource block sent by the D2D user equipment. Step 303: The base station obtains channel state information, and the cellular user The performance threshold value allowed by the device and the bandwidth resource allocated by the cellular user equipment adjust the transmit power allowed by the D2D user equipment on the logical resource block.

In this embodiment, the base station can serve multiple user equipments. There may be a cellular user equipment using cellular communication; there may also be a D2D user equipment using D2D communication, and two or more D2D user equipments forming a D2D communication pair. The base station can employ multiple antennas, each of which can cover one sector of the cell.

In step 301, for example, for each sector, the base station may first allocate radio resources to the C user equipment according to system-specific band resource allocation and power control algorithms. Band resource allocation algorithm for C user equipment It can be predetermined by the system, and can refer to the prior art, and details are not described herein again.

In a heterogeneous network scenario, it is assumed that an LTE-based physical layer access technology is used. Band resource to logical resource blocks (LRB, Logical Resource Block) as a basic unit, each logical resource block contains a fixed number N _PM physical resource blocks (PRB, Physical Resource Block) ₀ wherein C multiuser user equipment The frequency band allocation strategy may use a frequency domain proportional fairness algorithm; in terms of power control, the OL-FPC algorithm in the 3GPP standard may be used.

In this embodiment, it is necessary to preferentially allocate radio resources to the C user equipment, because the core purpose of introducing D2D communication is to supplement rather than replace the existing conventional cellular network. Therefore, as a subject in a traditional cellular network, the transmission performance of the C user equipment needs to be guaranteed. This is mainly reflected in two aspects: Compared with the D user equipment, the C user equipment has a higher priority for the use of the frequency band resources; the resource allocation scheme of the D user equipment needs to avoid causing large cross-layer interference to the C user equipment. ;

In this embodiment, it is assumed that the number of types of user equipments and frequency band resources is fixed in each sector, and the specific settings are as follows: C: The number of user equipments is M, and the number of D user equipments is N. The number of LRBs is, and the respective corresponding set representations are X, ; Γ and Z, and the band multiplexing factor between sectors in the system is 1. In addition, X can be made to represent the LRB resource number to which the first C user equipment is assigned. In step 302, the base station may receive channel state information (CSI) on the logical resource block sent by the D2D user equipment. Before being allocated radio resources, the D2D communication pair can measure each other by using some reference signals, such as a Sounding Reference Signal (SRS), or any other reference symbol sent by the D2D user. The radio channel quality is obtained, for example, channel state information on all LRBs; and can be fed back to the base station side through the uplink control channel.

In this way, each base station can obtain the interference distribution matrix of the D user equipment in the sector to which it belongs (/„ ₄ ^^, where / _ni flag the interference and noise received by the wth D user equipment on the first resource; secondly, There is also a link gain vector (<3⁄4„^ _χ1) between the D2D communication pairs, where G„„ is the link gain between the transmitting end of the wth D2D user equipment and the receiving end of the corresponding D2D user equipment.

In addition, the base station side can also obtain the link gain vector of the transmitting end of each D2D user equipment to the associated base station.

(G _nB ) _Nxl , where G„ _s represents the link gain of the “D2D user equipment from the transmitting end to the base station to which it belongs. With the above information, the base station side can effectively measure the transmission performance of the D2D communication pair and the C user equipment. Dry Disturbance capability, assisting the power adjustment process in subsequent steps;

In this step, the D2D user equipment is required to perform separate interference measurement or signal strength measurement, which may be configured or triggered by the physical layer, or may be configured by a higher layer. The time domain/frequency domain/code domain resources of a particular D2D link can be configured for measurements. If you need to report, you can also configure the reporting period, offset, and other information. If it is a high-level configuration, you can configure the corresponding measurement object (for example, you can include one or several kinds of information: interference measurement, and / or signal measurement, measured D2D link related time-frequency resource information, sequence information, etc.), and measurement Events, measuring entry and exit conditions for events, etc.

In step 303, the base station side can further adjust the transmit power value that the D user equipment allows in different LRBs based on the change of the radio channel environment and the multiplexing of the band resources on the basis of the conventional OL-FPC.

In this embodiment, a good wireless channel environment between adjacent communication pairs can be fully utilized under the condition that the additional impact on the C user equipment does not exceed a certain performance threshold. The performance threshold may be determined by an IoT (Interference over Thermal) on the base station side. The threshold can also be an increase in IoT, for example: IoT Beta >= IoT (with D2D transmission)-IoT (without D2D transmission)

In this embodiment, for any LRB, if it has been assigned to a user equipment, the power adjustment process of the D user equipment w on the resource may be as shown in the following formula (1). Assume that the additional loss threshold allowed by the C user equipment is ^.

P; ^d→ = min{m _a x{P caI _bps(^) x _r > [caI _bps(^) - ( 1 ) cal bps{ ~ factory) "],,P,≥P } , P , P } x (

Wherein, ^L = r=; represents the transmit power value adjusted when the first D2D user equipment uses the first logical resource block in a multiplexed manner; P _B represents the transmission of the wth D2D user equipment on the first logical resource block Power; P represents the required transmit power under the condition of satisfying the maximum signal to interference and noise ratio supported by the Modulation and Coding Scheme (MCS); ca/ represents the mapping function of the signal-to-noise ratio of the user equipment to the transmission rate; _m indicates the strength of the useful signal on the base station side when the first cellular user equipment uses the first logical resource block; and indicates the strength of the interference plus noise on the base station side when the first cellular user equipment uses the first logical resource block; a protection threshold of the cellular user equipment; The dish represents the maximum transmit power of the D2D user equipment, _Pmin represents the minimum transmit power of the D2D user equipment; represents the maximum signal to interference and noise ratio supported by the modulation and coding scheme; G„„ indicates the “D2D user equipment pair” Link gain; / _ni indicates the interference plus noise received by the wth D2D user equipment on the first logical resource block. For example, it is the threshold of ^ |^/_ ^(^^)>^ in the above formula (1), that is, ^ | _ca /_ ^(^^)>^

I I

The value is less than or equal to ^.

In this embodiment, if the LRB is not assigned to any C user equipment, the D user equipment "power adjustment result on the LRB can be as shown in the following equation (2). -

2) cal_bps{ )]xampliJy, P„ _k ≥P _m ) ^},mm(P„T,P _m } where ^ denotes when the D2D user equipment uses the first logical resource block in an orthogonal manner. Transmit power value; represents the average of the solved algebra; P _B represents the transmit power of the wth D2D user equipment on the first logical resource block; /_6«(·) represents the mapping function of the signal to interference ratio of the user equipment to the transmission rate ; indicates the number of the logical resource block to which the i-th cellular user equipment is allocated; re^. indicates the strength of the useful signal on the base station side when the i-th cellular user equipment uses the first logical resource block; indicates the i-th cellular user The strength of the interference plus noise on the base station side when the device uses the first logical resource block; the protection threshold value for the cellular user equipment; P _max represents the maximum transmit power of the D2D user equipment, P _mm represents the The minimum transmit power of the D2D user equipment; ^^ indicates the transmit power of the D2D user equipment calculated according to the open loop power control; the amplify fade indicates the expansion coefficient in the power adjustment when the D2D user equipment uses the orthogonal resource. For example, ^ is C use Additional losses acceptable threshold device, is the formula (2) ^ I cal _ bps ^) χ γ threshold, i.e., P _nk I cal _ bpsi ^) χ γ value of less than or equal to β. In addition, the formula parameter description in the band resource allocation in the above formula (1) (2) can also refer to Table 1 below.

Table 1 Symbol Description

When the nth D user uses the kth LRB in a multiplexed manner, the transmit power p should be adjusted. The transmit power of the nth D user on the kth LRB; cal _ bps *) User SINR to transmission rate mapping Function

When the mth C user uses the kth LRB, the strength of the useful signal on the base station side (unit is mW);

When the mth C user uses the kth LRB, the strength of the interference plus noise on the base station side (unit is mW);

Additional loss threshold for β C user performance;

r Actual protection threshold for C user performance (based on OL-FPC); p, p D user maximum and minimum transmit power;

When the nth D user uses the kth LRB in an orthogonal manner, the transmit power mean{') should be adjusted to find the algebraic mean; amplify the expansion factor in the D user power adjustment when the D user uses the orthogonal resource. It is to be noted that the above is merely illustrative of the invention, but the invention is not limited thereto. For example, step 301 and step 302 may not be performed in sequence, and step 302 may be performed first and then step 301 may be performed, or may be performed in parallel.

In this embodiment, the purpose of formula (1) is to maximize the transmit power of the D user equipment while ensuring that the additional loss of the C user equipment in the same sector as the target D user equipment does not exceed a certain threshold. , play a good wireless channel environment between D2D communication pairs. Equation (2) is for the case where the D user equipment uses orthogonal resources with the C user equipment of the sector. Compared with the formula (1), the cross-layer interference in the small area disappears, and the cross-layer interference of the small interval needs to be considered.

Therefore, when selecting the transmit power, it is assumed that the D user equipment multiplexes the frequency band resources with the existing C user equipments in the same cell, and solves all the power values according to the formula (1), and finally obtains the algebraic average of the power sets. The value of the value is as follows: On the one hand, since the received signal of the D user equipment on the base station side of the local sector is larger than that of the neighboring neighboring base station side, the cross-layer interference between the cells can be effectively limited; The average method does not limit the transmission of D user equipment due to the special circumstances of a C user equipment. Shooting power.

In addition, the formula (2) also adds the expansion factor amp/. For example, the larger the Amplify, the smaller the equivalent protection threshold. The smaller the amplify, the larger the equivalent protection threshold, thus further improving the transmission performance of the D user equipment.

In addition, considering the random characteristics of the wireless channel and the mutual influence between the cells, the protection threshold selected for the C user equipment is initially; less than the maximum acceptable threshold value ^, by counting the performance of the C user equipment, According to the difference between the actual value and the target value, the protection threshold is adjusted on a large time scale; so as to achieve the purpose of fully utilizing the proximity advantage of the D user equipment.

FIG. 4 is still another schematic flowchart of a resource allocation method according to an embodiment of the present invention. As shown in FIG. 4, the resource allocation method includes:

Step 401: The base station allocates a frequency band resource in a logical resource block unit to the cellular user equipment. Step 402: The base station receives channel state information on the logical resource block sent by the D2D user equipment. Step 403: The base station obtains channel state information, and the cellular user The performance threshold value allowed by the device and the bandwidth resource allocated by the cellular user equipment adjust the transmit power allowed by the D2D user equipment on the logical resource block.

The above steps 401 to 403 are the same as steps 301 to 303. As shown in FIG. 4, the method may further include:

Step 404: The base station estimates a transmission rate of the D2D user equipment on the logical resource block according to the allocated frequency band resource of the cellular user equipment and the transmit power allowed by the D2D user equipment on the logical resource block, and allocates the frequency band resource for the D2D user equipment. .

In step 404, according to the frequency band allocation result of the C user equipment in step 4041, and the transmit power value allowed by the D user equipment on each frequency band resource in step 403, the base station side can evaluate that the D2D communication pair can be on different LRBs. Obtained transmission performance, get transmission performance matrix

, ^^^^ is the transmission rate of the wth D user equipment on the first LRB, as shown in the following formula (3),

X

Rate _nk = cal bps (― ―), n≡Y, k≡ Z, mode = underlay , overlay (3 ) where mode = u derlay or overlay ; rai^ indicates the first? The transmission rate of the D2D user equipment on the first logical resource block; /_^ ·) indicates the mapping function of the user equipment's signal to interference and noise ratio to the transmission rate; :^ indicates when the first D2D user equipment is multiplexed or orthogonal When using the first logical resource block Adjusted transmit power value; G „ indicates the link gain between the 020 user equipment pairs; / _ni indicates the interference and noise received by the D2D user equipment on the first logical resource block.

Then, the base station side can allocate corresponding LRBs to the N D user equipments by using a traditional multi-user frequency band resource allocation scheme, such as a frequency domain proportional fairness algorithm, a Round-robin or a PF algorithm.

For example, the base station side may use a polling algorithm or a proportional fair algorithm for resource allocation. If it is a polling algorithm, the frequency domain resources are randomly allocated to each user equipment, or the frequency domain resources are allocated to each user equipment one by one in order, so that each user equipment is uniformly scheduled by the opportunity. If it is a proportional fair algorithm, calculate the instantaneous throughput of each user equipment according to the calculated transmission power, and then divide the instantaneous throughput by the historical average throughput to obtain a PF (Proportional Fair) weight; For the frequency domain resources, the PF values of the UEs are sorted, and the UE with the largest PF value is selected for scheduling.

In this embodiment, the resource allocation of the D user equipment is based on the adjustment result of the transmission power under the constraint condition, and the adjustment result of the transmission power directly determines the impact of the D user equipment on the C user equipment on different resources; It also reflects the transmission performance of the D user equipment on a specific resource. Therefore, the transmission performance matrix (mte^^ embodies the contribution of all D user equipment to the overall performance of the system.

It is to be noted that the above description is only illustrative of the invention, and for example, the above formula is merely a preferred embodiment of the invention. However, the present invention is not limited thereto, and for example, the above formula may be appropriately modified or adjusted, and a specific embodiment may be determined according to actual conditions.

It can be seen from the above embodiments that in order to achieve the above design goals and ensure the effectiveness and practicability of the algorithm, the D-substitute device is used to assist the allocation mode of the base station, and there is no measurement or feedback requirement for the existing C user equipment in the network. , limiting unnecessary signaling overhead, and increasing the ability of D2D communication to integrate with existing network environments.

In addition, in each sector, the base station collects channel state information between D2D communication pairs, and combines constraints on the performance of C user equipment and C user equipment based on the traditional open loop part power compensation algorithm (OL-PFC). As a result of the band allocation, the transmit power of the D user equipment is improved: on the potential orthogonal frequency band resources, the transmission performance is increased as much as possible, and the wireless channel environment of the adjacent communication pair is fully utilized; on the potential multiplexed band resources, according to the constraint conditions , effectively limit the transmit power of the D user equipment, avoiding strong cross-layer interference

(Cross-Layer Interference). The adjusted transmit power is ultimately reflected in the measurement of the band allocation scheme, and then the design goal is achieved by the band allocation result.

When the system is under high load, the effect of the embodiment in improving the overall performance of the system is particularly obvious: Among the total interference received by the C user equipment, the proportion of cross-layer interference caused by the D user equipment is small. Under the constraint condition, the impact of power boost is within the acceptable range; on the other hand, under high load, most of the D user equipment is in the power limited state, and the boost power is raised to improve D. The transmission performance of the user equipment is more efficient. In addition, the transmission power adjustment scheme can be used to estimate the transmission performance of the D user equipment, thereby enabling the frequency band resource allocation scheme to more accurately implement the frequency band resource allocation between the D user equipments. Example 2

The embodiment of the present invention provides a resource allocation method, which is described from the user equipment side. For the same content, refer to Embodiment 1. FIG. 5 is a schematic flowchart of a resource allocation method according to an embodiment of the present invention. As shown in FIG. 5, the resource allocation method includes:

Step 501: The D2D user equipment measures channel state information on the logical resource block between the D2D communication pair. Step 502: The D2D user equipment sends the measured channel state information on the logical resource block to the base station or the central control user equipment.

In this embodiment, the D2D user equipment performs separate interference measurements or signal strength measurements. The D2D communication pair can measure the quality of the wireless channel between each other by using some reference signals, such as SRS or any other reference symbols sent by the D2D user, to obtain, for example, channel state information on all LRBs; The channel is fed back to the base station side.

In this embodiment, the channel state information on the measured logical resource block may be sent to the base station side, or may be sent to the central control user equipment. In this scenario, the central control user equipment may control other D2D user equipments. Perform resource allocation and adjustment of transmit power. Therefore, the D2D user equipment is used to assist the base station or the center to control the allocation mode of the user equipment, and there is no measurement or feedback requirement for the existing C user equipment in the network, which can limit unnecessary signaling overhead, and increase D2D communication for existing The ability to integrate the network environment.

Moreover, the base station or the central control user equipment collects channel state information between the D2D communication pairs, and combines the constraints on the performance of the C user equipment and the frequency band allocation result of the C user equipment, so that the transmission power of the D user equipment can be improved. The adjusted transmit power is ultimately reflected in the measurement of the band allocation scheme, and then the design goal is achieved by the band allocation result. Example 3 The embodiment of the present invention provides a resource allocation apparatus, which may be a base station or a central control user equipment, and corresponds to the resource allocation method in Embodiment 1, and the same content is not described herein. For convenience of description, only the resource allocation device will be described as an example of a base station, and the case where the resource allocation device centrally controls the user equipment is similar thereto.

FIG. 6 is a schematic diagram of a structure of a resource allocating apparatus according to an embodiment of the present invention. As shown in FIG. 6, the resource allocating apparatus 600 includes: a resource allocating unit 601, an information receiving unit 602, and a power adjusting unit 603; Reference can be made to the prior art.

The resource allocation unit 601 allocates a frequency band resource in units of logical resource blocks to the cellular user equipment; the information receiving unit 602 receives channel state information on the logical resource block sent by the D2D user equipment; and the power adjusting unit 603 obtains channel state information according to the basis. The performance threshold value that the cellular user equipment is allowed to lose and the bandwidth resource allocated by the cellular user equipment adjust the transmit power allowed by the D2D user equipment on the logical resource block.

In an embodiment, the power adjustment unit 603 may be specifically configured to: for a certain logical resource block, if it has been allocated to a cellular user equipment, the power adjustment of the D2D user equipment w on the logical resource block Use the following formula:

P: ^d ^ = mm{m P _n A cal _bp _S (^) _Y > [cal _bps(^) - cal bps{ ~ factory) "],,P,≥P } , PP } x (

Where _ ^L = r=; represents the transmit power value adjusted when the first D2D user equipment uses the first logical resource block in a multiplexed manner; Ρ represents the transmission of the wth D2D user equipment on the first logical resource block Power; /_6 «(·) represents the mapping function of the signal-to-noise ratio of the user equipment to the transmission rate; rev _mk represents the strength of the useful signal at the base station side when the first cellular user equipment uses the first logical resource block; ':' indicates the strength of interference plus noise on the base station side when the mth cellular user equipment uses the first logical resource block; indicates the protection threshold value for the cellular user equipment; P _max indicates the D2D user equipment Maximum transmit power, P _mm represents the minimum transmit power of the D2D user equipment; Γ represents the maximum signal to interference and noise ratio supported by the modulation and coding scheme; G... indicates the link gain between the wth D2D user equipment pairs; _Ni denotes the interference plus noise received by the first D2D user equipment on the first logical resource block. In another embodiment, the power adjustment unit 603 may be specifically configured to: for a certain logical resource block, if not allocated to the cellular user equipment, the power adjustment of the D2D user equipment w on the logical resource block is adopted. The following formula: -

Cal_bps{ )] x ampliJy, P„ _k ≥P _m ) ^} , mm(P„T, P _m } where P: indicates that the wth D2D user equipment is adjusted when the first logical resource block is used in an orthogonal manner The transmit power value; represents the average of the solved algebra; P _B represents the transmit power of the wth D2D user equipment on the first logical resource block; / _ 6 «(·) indicates the signal to interference and noise ratio of the user equipment to the transmission rate Mapping function; indicates the number of the logical resource block to which the i-th cellular user equipment is allocated; re^. indicates the strength of the useful signal on the base station side when the i-th cellular user equipment uses the first logical resource block; indicates the i-th The strength of the interference plus noise on the base station side when the cellular user equipment uses the logical resource block; the protection threshold value for the cellular user equipment; P _max indicates the maximum transmission power of the D2D user equipment, P _Mm represents the minimum transmit power of the D2D user equipment; amplify fading, the expansion factor in the power adjustment when the D2D user equipment uses orthogonal resources.

As shown in FIG. 6, the resource allocation device 600 may further include: a rate estimating unit 604;

The rate estimating unit 604 estimates the transmission rate of the D2D user equipment on the logical resource block according to the frequency band resource allocated by the cellular user equipment and the transmission power allowed by the D2D user equipment on the logical resource block; and the resource allocation unit 601 further It can be used to allocate band resources for D2D user equipment.

In one embodiment, rate estimation unit 604 can take the following formula:

X

Rate _nk = cal _ bps (- ~≡-) where mode = underlay or ove ay rate _nk represents the transmission rate of the nth D2D user equipment on the kth logical resource block; / _ 6 «(·) indicates the user a mapping function of the signal-to-noise ratio of the device to the transmission rate; indicating a transmit power value adjusted when the first w D2D user equipment uses the first logical resource block in a multiplexed or orthogonal manner; G... indicates the first 020 user The link gain between device pairs; / _ni indicates the interference plus noise received by the first D2D user equipment on the first logical resource block.

It can be seen from the foregoing embodiment that the D2D user equipment is used to assist the base station or the center to control the user equipment. In the allocation mode, the base station or the central control user equipment collects channel state information between the D2D communication pairs, and combines the constraints on the performance of the cellular user equipment and the bandwidth allocation result of the cellular user equipment to adjust the transmit power of the D2D user equipment. It can make full use of the good transmission environment between adjacent communication pairs, and effectively limit the impact on the traditional cellular network, increase the frequency band utilization and improve the overall performance of the system. Example 4

The embodiment of the present invention provides a user equipment, and the user equipment forms a D2D communication pair with other user equipments, and corresponds to the resource allocation method in Embodiment 2. The same content is not described herein.

FIG. 7 is a schematic diagram of a configuration of a user equipment according to an embodiment of the present invention. As shown in FIG. 7, the user equipment 700 includes: an information measuring unit 701 and an information sending unit 702; a portion not shown in the figure may refer to the prior art.

The information measuring unit 701 measures channel state information on the logical resource block between the D2D communication pairs. The information sending unit 702 sends the measured channel state information on the logical resource block to the base station or the central control user equipment.

It can be seen that, by using the D2D user equipment to assist the base station or the central control user equipment allocation manner, the base station or the central control user equipment collects channel state information between the D2D communication pairs, and combines constraints on the performance of the cellular user equipment and The result of the band allocation of the cellular user equipment adjusts the transmit power of the D2D user equipment. It can make full use of the good transmission environment between adjacent communication pairs, and effectively limit the impact on traditional cellular networks, increase the frequency band utilization and improve the overall performance of the system. Example 5

The embodiment of the present invention further provides a communication system, including the resource allocation apparatus according to Embodiment 3 and the user equipment as described in Embodiment 4. For convenience of description, the following is an example in which the resource allocation device is used as a base station, and the case where the resource allocation device centrally controls the user equipment is similar.

FIG. 8 is a schematic diagram of a configuration of a communication system according to an embodiment of the present invention. As shown in FIG. 8, the communication system 800 includes a base station 801, a user equipment 802, and a user equipment 803. The base station 801 may be the base station 600 described in Embodiment 3; the user equipment 802 may be a cellular user equipment that performs cellular communication; and the user equipment 803 performs D2D communication with other user equipments, which may be the user equipment described in Embodiment 4. 700.

The embodiment of the present invention further provides a computer readable program, wherein when the program is executed in a base station, the program causes a computer to execute the resource as described in Embodiment 1 above in the base station or the central control user equipment. Source allocation method.

An embodiment of the present invention further provides a storage medium storing a computer readable program, wherein the computer readable program causes a computer to perform a resource allocation method as described in Embodiment 1 above in a base station or a central control user equipment.

The embodiment of the present invention further provides a computer readable program, wherein when the program is executed in a user equipment, the program causes the computer to execute the resource allocation method as described in Embodiment 2 above in the user equipment.

The embodiment of the present invention further provides a storage medium storing a computer readable program, wherein the computer readable program causes the computer to execute the resource allocation method as described in Embodiment 2 above in the user equipment. Example 6

The present invention is further illustrated by simulation on the basis of Embodiments 1 to 5. The scenario of this simulation is an LTE-based radio access network (AN, Radio Access Network). There are N^ cells in the whole AN, and each cell contains 3 sectors. There is one base station (eNodeB, evolved NodeB) in each cell, the base station adopts vertex excitation, and the distance between adjacent base stations is ISD (Inter-Site).

Distance). There are three directional antennas at each base station, each covering one sector in the cell to which it belongs. The radiation pattern is as shown in the following equation (4). Further, it is assumed that the user equipment side is a single omni-directional antenna.

A(0) ^ mm{A _m ,l 2 x (0/ e _3dB ) ² } (4)

Among them, it is the maximum attenuation of the antenna, which is the 3dB angle of the antenna beam, and is the angle between the user's position and the main line direction of the antenna on the antenna side. It is assumed that D2D communication only multiplexes the uplink frequency band in the traditional cellular network, and the D2D communication pair can perform bidirectional communication by means of FDD (Frequency Division Duplex).

D2D communication has many advantages in multiplexing the uplink frequency band resources of the traditional cellular network. Firstly, the interference caused by the D2D communication to the downlink signaling transmission of the C user equipment is reduced. The signaling is the most important link in the communication, except for the establishment of the link. In addition to the removal, it also directly affects the quality of service of users during communication; secondly, it avoids the generation of a large peak-to-average power ratio (PAPR) at the transmitting end of the D user equipment, and improves the user's The power efficiency further extends the standby time of the user equipment. In addition, the characteristics of the user service result in the asymmetry of the data in both the uplink and the downlink, the downlink is congested, and the uplink is relatively idle. Therefore, the D2D communication can be multiplexed by the traditional cellular The way of network uplink frequency band resources improves the frequency band utilization, Effectively enhances the overall performance of the system.

In each sector, users of both modes can only allocate one LRB, and each LRB resource block contains N _PM PRBs. M ≤ , N ≤ between the number of two types of communication users and the number of resources in each sector. Therefore, the design of the scheduling process is not considered in the allocation of the band resources; in addition, it is assumed that each base station can obtain all the links under it. According to the above CSI, the base station side can operate its specific radio resource management mechanism (RRM), without being aware of the specific location information of the user equipment, adapting to the radio link change of the multi-user equipment, and optimizing the system. Specific performance indicators.

In terms of the channel model, assuming that the channel is slowly time-varing, the propagation model between the C user equipment and the base station is as shown in the following equation (5).

L _c =128.1 + 37.6xlog ₁₀ (r _c ),r _c [^m] (5)

The transmission model between D2D communication pairs is as shown in the following equation (6).

^ =148.1 + 40xlog ₁₀ (r» ] (6) In addition, shadow fading is also considered in path loss 3⁄4 / ₀ , assuming it satisfies log-normally distributed, expressed as logF, therefore, path The final expression of the loss is shown in the following equation (7).

Pathloss _i - L _i + log F, ic, d mode (7) In this embodiment, the important parameter settings in the simulation are shown in Table 2 below.

Table 2 Setting of system parameters in simulation

parameter settings

Scene layout (Layout) N _ceU =7 (wrap-around)

Adjacent base station distance (ISD) 500m

System carrier frequency 2GHz

System uplink frequency band 5MHz (24 PRBs for uplink transmission)

Band multiplexing between sectors

The multiplexing coefficient is 1, that is, each sector can use all the band resources of the system.

(4,2), (6,4), (8,6), (10,8) (The previous number indicates the C user system load in each sector

Number, the last number indicates the number of D users in each sector)

Frequency allocation scheme for C users Probability Domain Proportional Fair (FDPF)

N

丄, PKB 2

Minimum distance between user and base station

30m

from

In this solution observation system, under different user loads, the transmission performance of two types of user equipment changes. The user load in the system is uniformly expressed as (x, j), where the previous number represents the class C user equipment in each sector. The number, the latter number indicates the number of D-type user devices.

In order to obtain the results with average significance, the network topology was averaged 100 times in the simulation under different system loads. The results of the overall performance of the two types of user systems are shown in Table 3 below.

Table 3 Comparison of traditional methods and overall performance of the system user in the system

System negative C user transmission speed C user transmission speed D user transmission speed D user transmission rate The net rate of the scheme (traditional mode) rate (this scheme) rate (traditional scheme) rate (in this scheme)

(4,2 ) 1.0876e+8 9.8822e+7 2.8348e+7 3.4062e+7 -4.2262e+6

(6,4 ) 6.333 le+7 5.6276e+7 3.8848e+7 4.9818e+7 +3.9137e+6

( 8,6 ) 5.9744e+7 5.3366e+7 3.8684e+7 5.0273e+7 +5.2101e+6

( 10,8 ) 5.5277e+7 4.9836e+7 3.214 le+7 4.2805e+7 +5.2237e+6 However, in order to further illustrate the role and significance of resource allocation in the present invention, the cumulative distribution function (CDF) of the D user transmit power in one implementation under four system loads is shown in Figures 6, 8, 10 and 12, respectively. The curves, Figures 7, 9, 11 and 13, respectively, show the variation of the transmission rates of the two types of users over time in the respective implementations.

The performance of the resource allocation scheme will be described below with reference to the accompanying drawings. 9 is a schematic diagram of a cumulative distribution function (CDF, Cumulative Distribution Function) curve of the D user equipment transmit power when the system load is (4, 2); FIG. 10 is a transmission rate of two types of user equipment when the system load is (4, 2) Schematic diagram of the curve of variation over time; Figure 11 is a schematic diagram of the CDF curve of the transmit power of the D user equipment when the system load is (6, 4); Figure 12 is the transmission rate of the two types of user equipment when the system load is (6, 4) Schematic diagram of the time change curve; Figure 13 is a schematic diagram of the CDF curve of the D user equipment transmit power when the system load is (8, 6); Figure 14 is the transmission rate of the two types of user equipment over time when the system load is (8, 6) Schematic diagram of the variation curve; Figure 15 is a schematic diagram of the CDF curve of the D user equipment transmit power when the system load is (10, 8); Figure 16 is the transmission rate of the two types of user equipment over time when the system load is (10, 8) Schematic diagram of the curve of change.

As shown in Figures 9 to 16, by observing the changes in the CDF curve of the D user equipment transmit power in Figures 9, 11, 13, and 15 as the system load changes, it can be seen that as the number of user equipment increases, the system appears With more and more band multiplexing situations, the CDF curve of the D user equipment transmit power moves to the left as a whole due to the constraint on the additional performance loss of the C user equipment. However, compared with the power control strategy of the OL-FPC in the conventional solution, the invention has a larger range of variation, which embodies the flexibility and opportunity of power adjustment, that is, appropriately improving the transmission power on orthogonal resources, fully The use of good wireless space, and effectively limit the transmission power on the multiplexing resources, improve the cross-layer interference between the traditional cellular network and D2D communication.

As shown in Figures 9 to 16, by observing Figures 10, 12, 14 and 16 in combination with the statistical results in Table 2, it can be seen that in the case of a system with a low load, such as at (4, 2), The C user equipment in the adjacent sector can basically use orthogonal resources, and the same layer interference of the small interval is eliminated. Therefore, although the number of C user equipments is not large, it has a good overall transmission rate. At this time, after adjusting the transmission rate of the D user equipment, the orthogonality between the C user equipment cells is eliminated, and the inter-cell cross-layer interference generated by the D user equipment accounts for a large proportion in the total interference of the C user equipment.

Therefore, it can be seen from the results of the first row in Table 2 that in the case where the C user equipment additionally loses 10% of the performance, the promotion of the D user equipment does not compensate for the loss of the C user equipment. This is mainly due to two reasons: First, the D user equipment is also in a good wireless communication environment at this time, and its performance is in a band-limited state. Therefore, the improvement of the transmit power does not bring about the same proportion of performance improvement; secondly, the number of D user devices is small at this time, which limits the improvement effect of the D communication layer.

As the system load increases, the net increase of the resource allocation scheme of the present invention continues to increase, that is, the limited performance loss of the C user equipment is in exchange for the improvement of the overall performance of the system. The reason for this phenomenon is: First, as the number of user equipments in the system increases, the orthogonality of the C user equipment in the adjacent sectors disappears in the frequency band resources, and the same layer interference between the cells increases continuously, and the C user equipment The overall performance is declining, and the cross-layer interference caused by the D user equipment is reduced in the total interference of the C user equipment. Therefore, the appropriate improvement of the transmission of the D user equipment does not affect the C user equipment as in (4, 2). A more obvious impact.

For the D user equipment, the neighboring wireless communication environment is also deteriorating. Under the traditional OL-FPC, the neighbor resources of the D user equipment cannot be fully utilized. After the power boost, although the magnitude of the boost is lower than in (4, 2), the performance improvement is greater than the result of (4, 2). In addition to the contribution of the increased number of user equipments, the D user equipment is at power The limit state is the main cause of the above results. Therefore, the effective power improvement under high load is more effective for improving the performance of the D user equipment.

It can be seen from the above embodiments that the characteristics and performance of the radio resource allocation scheme in this embodiment are further verified by the simulation results, which embodies the potential and value of D2D communication deployment in the traditional cellular network.

The above apparatus and method of the present invention may be implemented by hardware, or may be implemented by hardware in combination with software. The present invention relates to a computer readable program that, when executed by a logic component, enables the logic component to implement the apparatus or components described above, or to cause the logic component to implement the various methods described above Or steps. The present invention also relates to a storage medium for storing the above program, such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, and the like.

One or more of the functional blocks described in the figures and/or one or more combinations of functional blocks may be implemented as a general purpose processor, digital signal processor (DSP) for performing the functions described herein. An application specific integrated circuit (ASIC), field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, or any suitable combination thereof. One or more of the functional blocks described with respect to the figures and/or one or more combinations of functional blocks may also be implemented as a combination of computing devices, eg, a combination of a DSP and a microprocessor, multiple microprocessors One or more microprocessors in conjunction with DSP communication or any other such configuration.

The present invention has been described in connection with the specific embodiments thereof, and it should be understood by those skilled in the art that these descriptions are illustrative and not restrictive. Those skilled in the art can according to this The spirit and the spirit of the invention are variously modified and modified by the invention, and such modifications and modifications are also within the scope of the invention.

Claims

claims

1. A resource allocation method. The resource allocation method includes:

Allocate frequency band resources in units of logical resource blocks to cellular user equipment;

Receive channel status information on logical resource blocks sent by D2D user equipment;

According to the obtained channel state information, the performance threshold value of the allowable loss of the cellular user equipment, and the frequency band resources allocated to the cellular user equipment, adjust the allowed use of the D2D user equipment on the logical resource block transmitting power.

2. The method according to claim 1, wherein the resource allocation method further includes:

Estimating the transmission rate of the D2D user equipment on the logical resource block according to the frequency band resources allocated to the cellular user equipment and the transmission power allowed to be used by the D2D user equipment on the logical resource block; and

Allocate frequency band resources to the D2D user equipment.

3. The method according to claim 1, wherein adjusting the transmission power allowed to be used by the D2D user equipment on the logical resource block includes:

For a certain logical resource block ^:, if it has been allocated to a cellular user equipment, the power adjustment of the D2D user equipment w on the logical resource block adopts the following formula:

P: ^d ^ =mm{m P _n Acal_bp _S (^) _Y >[cal_bps(^)- cal bps{ ~ factory) "],,P,≥P },P ,P } x (

Among them, _ ^L = r=; represents the adjusted transmit power value when the th D2D user equipment uses the th logical resource block in a multiplexing manner; P _B represents the wth D2D user equipment on the th logical resource block. Transmit power; /_6«(·) represents the mapping function from the signal-to-interference-to-noise ratio of the user equipment to the transmission rate; rev _mk represents the strength of the useful signal at the base station side when the th cellular user equipment uses the th logical resource block; 1 :':' represents the intensity of interference plus noise on the base station side when the mth cellular user equipment uses the th logical resource block; represents the protection threshold value for the cellular user equipment; P _max represents the D2D user equipment The maximum transmit power, P _mm represents the minimum transmit power of the D2D user equipment; represents the modulation coding scheme supported The maximum signal-to-interference _- to-noise ratio supported by

4. The method according to claim 1, wherein adjusting the transmission power allowed to be used by the D2D user equipment on the logical resource block includes:

For a certain logical resource block, if it is not allocated to a cellular user equipment, the power adjustment of the D2D user equipment w on the logical resource block adopts the following formula:

= mm{m^ mean (m^{P _{nk C} al _bps(^ ) x _Y > [ _ca l _bps(^ ) - l , JJ ^m i ij ij cal_bps{ )] x

mm(P„T, P _m } where, P: represents the adjusted transmit power value when the w-th D2D user equipment uses the th logical resource block in an orthogonal manner; represents the solution algebraic average; P _B represents the w-th The transmit power of the D2D user equipment on the th logical resource block; /_6 «(·) represents the mapping function from the signal-to-interference-to-noise ratio of the user equipment to the transmission rate; represents the number of the logical resource block allocated to the i-th cellular user equipment. ; re^. represents the strength of the useful signal at the base station side when the i-th cellular user equipment uses the ^/th logical resource block; represents the interference at the base station side when the i-th cellular user equipment uses the ^/th logical resource block. The intensity of added noise; represents the protection threshold value for the cellular user equipment; P _max represents the maximum transmit power of the D2D user equipment, and P _mm represents the minimum transmit power of the D2D user equipment; amplify attenuation, D2D user Expansion factor in power scaling when the device uses orthogonal resources.

5. A resource allocation method, the resource allocation method includes:

The D2D user equipment measures the channel state information on the logical resource blocks between the D2D communication pairs; sends the measured channel state information on the logical resource blocks to the base station or central control user equipment.

6. A resource allocation device, the resource allocation device includes:

A resource allocation unit, which allocates frequency band resources in units of logical resource blocks to cellular user equipment; an information receiving unit, which receives channel state information on logical resource blocks sent by D2D user equipment; a power adjustment unit, based on the obtained channel state information , the performance threshold value of the allowable loss of the cellular user equipment and the frequency band resources allocated to the cellular user equipment, and adjust the transmission power allowed to be used by the D2D user equipment on the logical resource block.

7. The resource allocation device according to claim 6, wherein the resource allocation device further includes: A rate estimation unit, estimating the transmission of the D2D user equipment on the logical resource block according to the frequency band resources allocated to the cellular user equipment and the transmission power allowed to be used by the D2D user equipment on the logical resource block. rate; and

The resource allocation unit is also used to allocate frequency band resources to the D2D user equipment.

8. The resource allocation device according to claim 6, wherein the power adjustment unit is specifically configured to: for a certain logical resource block ^:, if it has been allocated to a cellular user equipment, then the D2D user equipment The power adjustment of w on the logical resource block adopts the following formula:

P: ^d ^ =mm{m P _n Acal_bp _S (^) _Y >[cal_bps(^)- cal bps{ ~ , -j . ^ )],,P,≥P min } -','P 'P max } Among them, _ ^ = _Γ =; represents the adjusted transmit power value when the wth D2D user equipment uses the th logical resource block in a multiplexing manner; Ρ represents the wth D2D user equipment on the th logical resource block. Transmit power; /_6«(·) represents the mapping function from the signal-to-interference-to-noise ratio of the user equipment to the transmission rate; rev _mk represents the strength of the useful signal at the base station side when the th cellular user equipment uses the th logical resource block; 1 :':' represents the intensity of interference plus noise on the base station side when the mth cellular user equipment uses the th logical resource block; represents the protection threshold value for the cellular user equipment; P _max represents the D2D user equipment The maximum transmit power _of / _ni represents the interference plus noise received by the th D2D user equipment on the th logical resource block.

9. The resource allocation device according to claim 6, wherein the power adjustment unit is specifically configured to: for a certain logical resource block, if it is not allocated to a cellular user equipment, the D2D user equipment The power adjustment on the logical resource block uses the following formula:

TCV.. TCV..

(max{P _nk I cal _ bps(—^) γ≥ [cal _ bps(—^) - cal_bps{ )}> ampliJy,P _nk >P _mm }),P } Pr,P _max )} where, P : Indicates the adjusted transmit power value when the w-th D2D user equipment uses the th logical resource block in an orthogonal manner; Indicates the algebraic average value of the solution; P _B indicates that the w-th D2D user equipment uses the The transmit power on logical resource blocks; / _6 «(·) represents the mapping function from the signal-to-interference-to-noise ratio of the user equipment to the transmission rate; represents the number of the logical resource block allocated to the i-th cellular user equipment; re^. represents When the ith cellular user equipment uses the ^/th logical resource block, the strength of the useful signal at the base station side; indicates the strength of the interference plus noise at the base station side when the ith cellular user equipment uses the ^/th logical resource block; represents the protection threshold value for the cellular user equipment; P _max represents the maximum transmit power of the D2D user equipment, and P _mm represents the minimum transmit power of the D2D user equipment; amplify fading, D2D user equipment uses orthogonal resources Expansion factor in time power adjustment.

10. A user equipment that forms a D2D communication pair with other user equipment. The user equipment includes:

The information measurement unit measures the channel state information on the logical resource blocks between D2D communication pairs; the information sending unit sends the measured channel state information on the logical resource blocks to the base station or central control user equipment.

11. A communication system, including:

D2D user equipment, for D2D communication;

Cellular user equipment, for cellular communications;

The base station or center controls the user equipment and allocates frequency band resources in units of logical resource blocks to the cellular user equipment; receives the channel state information on the logical resource blocks sent by the D2D user equipment; and according to the obtained channel state information , the performance threshold value of the allowable loss of the cellular user equipment and the frequency band resources allocated to the cellular user equipment, and adjust the transmission power allowed to be used by the D2D user equipment on the logical resource block.

12. The base station according to claim 11, wherein the base station or the central control user equipment is further configured to control the user equipment according to the frequency band resources allocated to the cellular user equipment and the D2D user equipment allowed on the logical resource block. Use the transmit power, estimate the transmission rate of the D2D user equipment on the logical resource block; and allocate frequency band resources to the D2D user equipment.

13. A computer-readable program, wherein when the program is executed in the user equipment, the program causes the computer to execute the resource allocation method as claimed in claim 5 in the user equipment.

14. A storage medium storing a computer-readable program, wherein the computer-readable program causes a computer to execute the resource allocation method according to claim 5 in a user device.

15. A computer readable program, wherein when the program is executed in a base station or central control user equipment, The program causes the computer to execute the resource allocation method according to any one of claims 1 to 4 in the base station.

16. A storage medium storing a computer-readable program, wherein the computer-readable program causes a computer to execute the resource allocation method according to any one of claims 1 to 4 in a base station or central control user equipment.