CN103220724B - Cellular and dimension to dimension (D2D) user frequency spectrum accessing method in D2D communication mixing system - Google Patents

Abstract

A D2D user spectrum access method in a cellular and D2D communication hybrid system. The operation steps of the base station are: (1) Generate a D2D user area feature list according to historical statistical information on the average interference power and density of D2D users in each area of the system ; (2) Generate the cellular user interference margin and its resource list in the system; (3) Compare the cellular user information with the D2D user information in each area, and obtain the geographical area suitable for D2D user multiplexing resources in the system and the corresponding wireless resources, and then initially divide the geographical range of D2D users according to the D2D user access criteria, and generate a list of D2D user frequency reuse areas; Spectrum access, and correspondingly update the D2D user area feature list and the D2D user frequency reuse area list according to user changes in the system. The invention has less calculation amount, high spectrum resource utilization rate and strong robustness.

Description

A D2D user spectrum access method in a cellular and D2D communication hybrid system

technical field

The invention relates to a D2D user spectrum access method in a cellular and terminal direct D2D (Device-to-Device) communication hybrid system, which belongs to the technical field of wireless communication.

Background technique

At present, the basic wireless communication network is a traditional large-scale wireless communication network based on the base station (BS) cell coverage. User terminals rely on the base station for communication. This network is called a cellular network. The short-distance communication network based on short-distance wireless communication technology constitutes another wireless communication network. In this wireless communication network, user terminals can communicate directly through direct connection or relay.

The traditional wireless communication network uses cell base stations to transfer and control the communication of all users in the system. When the information source and destination are very close, the communication still needs the base station to transfer, which results in low resource utilization. In order to improve the throughput of the system, traditional wireless communication technology will work together with short-distance wireless communication technology. Referring to Figure 1, a possible application scenario is introduced: users can choose cellular mode or D2D mode for communication, thereby improving network performance, and in such a D2D and cellular hybrid communication system, how to perform interference avoidance and resource allocation is a new problem to be solved.

In the above hybrid system, when D2D users in different geographic locations multiplex uplink cellular resources, the interference caused to the signal received by the base station is different, and the interference value suffered by different cellular users CeUE (Cellular User Equipment) Therefore, the present invention proposes a method for helping D2D users complete spectrum access by using geographical location differences, so as to improve the system capacity and reduce the complexity of system implementation.

At present, one of the existing technologies is that in a hybrid cellular and D2D communication system, a base station divides specific resources to access D2D users. In this scheme, the base station divides the spectrum resources in the system, allocates a part of the resources allocated in the system to the corresponding D2D users, and the D2D users allocated to these resources use these resources for direct communication. Communication is controlled (such as power allocation and resource scheduling, etc.). The base station first allocates uplink frequency resources for terminals capable of D2D communication in the system, and then performs grouping according to all terminals capable of D2D communication existing in the system. Next, select a terminal in each group as the master device in the D2D user group, and then notify all D2D users in the system of the upper limit of transmission power and the resources they can use through system broadcasting. Finally, the main control device in each group divides the resources of the D2D users in the group under its jurisdiction, and reports the resources and information about the state changes of D2D communication terminals to the control center, that is, the base station in real time, so that the base station Timely global control.

The advantage of this technical solution is: since the base station allocates dedicated resources to D2D users in the system, it will not cause interference to other communication devices (such as cellular users with normal communication in the system), so the power control of the base station is relatively simple; moreover, After the spectrum resources are divided, the distributed D2D user group is used to divide the resources again, which can also reduce the burden of the cell base station. This method is suitable for when the normal cellular communication service in the system is not very busy.

The disadvantage of this technical solution is: as mentioned above, this spectrum allocation method requires the base station of the cell to allocate a part of specific spectrum resources for D2D communication, which causes the following three defects: 1. Since it is available from the entire Part of the resources in the frequency spectrum are allocated exclusively for D2D communication, which leads to the shortage of available resources for non-D2D communication (such as cellular voice communication) in the system. 2. When the business of cellular users in the system is relatively busy, especially for systems such as LTE (Long Term Evolution) that quickly schedule spectrum resources, it becomes very difficult to allocate a part of the entire spectrum for D2D communication. difficulty. 3. Considering that D2D communication is not completely continuous and uninterrupted, resources may be wasted after allocating dedicated resources.

Another existing technical solution improves the above-mentioned defect of allocating dedicated spectrum for D2D user communication, which is that D2D users directly multiplex on cellular user spectrum resources in a cellular and D2D communication hybrid system. The specific method is as follows: the base station first schedules the cellular users, so that the cellular users use corresponding spectrum resources to communicate. Then, the base station implements spectrum access and power control for the D2D users in the system. The purpose is to improve the system capacity through short-distance D2D communication without causing harmful interference to cellular users. At this time, the base station first broadcasts the uplink resource mapping information of wireless resource management, and the D2D users obtain the resource allocation information of the cellular users in the current system by receiving and demodulating the broadcast information; The interactive interference information is used to obtain the interference of actual cellular users, and then predict the interference of different resources in the next cellular communication, and select those resources with weak interference to D2D user communication to transmit data, complete D2D communication, and improve the capacity of the entire system.

The advantage of this technical solution is that D2D users can reuse resources of current cellular users, and the base station does not need to specially allocate spectrum resources for D2D communication, which improves the spectrum utilization rate of the system. It can adapt to some systems with large traffic volume or rapid scheduling, and reuse the resources of current cellular users through D2D users to achieve the purpose of improving system capacity.

However, the disadvantages of this solution are as follows: since the D2D users need to reuse the spectrum resources of the current cellular users, their transmission power must be limited to a certain extent and cannot cause harmful interference to the cellular users. This requires the base station to perform power control or the D2D users themselves to adjust according to the interference measurement results, which will cause heavy system load, especially when there are many D2D users.

To sum up, the adoption of cellular and D2D communication methods not only needs to solve the spectrum resource utilization problem, but also solve the complexity problem of technical solution implementation.

Therefore, in a hybrid cellular and D2D communication system, how to effectively utilize spectrum resources while reducing the computational complexity of the system is an urgent problem to be solved. In summary, the specific problems that exist include:

1. Generally, the prerequisite for D2D communication to reuse cellular system resources is that D2D communication cannot cause harmful interference to cellular users. For each D2D user in the system, if it wants to access the available spectrum, it needs to calculate whether it will cause harmful interference to the current cellular user after accessing the spectrum. However, when the number of D2D users is relatively large, the huge amount of calculation will cause a great burden to the cellular system.

2. The traditional cellular and D2D communication hybrid system lacks consideration of the system's historical scheduling information or system historical behavior information, so the scheduling strategy has certain limitations.

3. Since D2D communication supports short-distance burst data service transmission, and in some cellular communication systems, communication services in cells change frequently, therefore, if the method for D2D users to access spectrum is unreasonable, it will Normal communication services are affected.

4. In the actual communication system, the propagation loss of the signal is related to the propagation distance in space. Therefore, for a D2D user that multiplexes uplink resources, its distance to the cell base station directly affects the interference received by the cellular user. If the mobility of the D2D user is considered, it is often necessary to change the location of the D2D user, Re-measure and calculate the system interference, which further increases the burden on the system.

Therefore, how to reduce the computational load of the system while making full use of the spectrum resources while reusing the spectrum resources of the current cellular users, and improve the robustness of the system without causing harmful interference to the cellular communication Sexuality has become the focus of attention of scientific and technological personnel in the industry.

Contents of the invention

In view of this, the object of the present invention is to provide a D2D user spectrum access method in a cellular-to-device direct D2D communication hybrid system, so as to realize the multiplexing of the current cellular user spectrum resources, reduce the amount of calculation of the system, and at the same time It also makes full use of frequency spectrum resources, and improves the robustness of the system under the premise of not causing harmful interference to cellular communications.

In order to achieve the above purpose, the present invention provides a D2D user spectrum access method in a cellular-to-terminal direct D2D (Device-to-Device) communication hybrid system, which is characterized in that: the method is based on the history of the system in the base station Statistical information and regional division are used to realize D2D user spectrum access; the method includes the following steps:

(1) According to the historical statistical information of the average interference power and density of D2D users in each area of the system, the base station generates a list of D2D user area characteristics in the cellular and D2D communication hybrid system;

(2) According to the interference margin of cellular users in the system and the resources they occupy, the base station generates a list of interference margins and resources of cellular users in the hybrid cellular and D2D communication system;

(3) The base station compares the obtained cellular user information with the relevant information of D2D users in each area, and obtains the geographical area suitable for D2D user multiplexing resources in the system and the corresponding wireless resources, so as to follow the D2D access criteria Initially divide the geographical range of D2D users, and generate a list of D2D user frequency reuse areas;

(4) While ensuring the normal communication of cellular users, the base station directly accesses the D2D user spectrum according to different areas, and updates the D2D user area characteristic list and the D2D user frequency reuse area list according to the user changes in the system.

In order to realize the multiplexing of cellular resource transmission for D2D users in the cellular and D2D communication hybrid system and reduce the amount of calculation, the present invention has the following advantages and effects compared with the best existing technology:

(1) The calculation amount of the base station is small, and the operation burden is light: since the access to the D2D user is directly accessed according to the geographical location, it is not necessary to traverse the cellular users in the system for each D2D user, and calculate the D2D user pair interference caused by cellular users in the system, thereby significantly reducing the amount of computation.

(2) The delay is low, and the direct access speed of D2D users is fast: For each area in the D2D user frequency reuse area list, if the number of D2D users in the corresponding area does not exceed the maximum allowed access D2D users in the area If the number of D2D users in the corresponding area exceeds the maximum number of D2D users allowed in the area, it is only necessary to complete the list. Access is performed after partial updates, so latency is low.

(3) Cellular resources are fully utilized: the access method of the present invention is different from similar technical solutions such as competitive access. In this system, the same cellular resources can be multiplexed by multiple D2D users at the same time, and multiplexed D2D users can be realized. The number of users depends on the maximum number of D2D users allowed to access each area in the D2D user frequency reuse area list.

(4) There is no need for more complex signaling interactions, and the system load is light: when performing list generation and access operations, the base station only needs to know the user's geographic location and its corresponding reference signal information in the system.

(5) Make full use of the historical statistical information of the base station: by using the historical statistical information of the base station, D2D users can directly complete the access of cellular user resources, thereby avoiding a large number of calculation operations, and at the same time updating the maintenance list in real time, it can also enable D2D users to access the cellular user resources. While multiplexing system cellular user resources, it does not cause harmful interference to cellular users, and also reduces the amount of calculation, and these effects have the effect of reducing delay.

Description of drawings

Fig. 1 is a schematic diagram of an application scenario of cellular network + D2D communication.

Fig. 2 is a schematic diagram of an application scenario of a hybrid cellular and D2D communication system based on geographic location division.

Fig. 3 is a flowchart of the operation steps of the D2D user spectrum access method in the cellular and D2D communication hybrid system of the present invention.

FIG. 4 is a flow chart of operation step 1 of the method of the present invention: generating a feature list of a D2D user area.

Fig. 5 is the operation step 2 of the method of the present invention: the flow chart of generating cellular user interference margin and its resource list.

Fig. 6 is a flowchart of operation step 3 of the method of the present invention.

FIG. 7 is a schematic diagram of an update process of a D2D user area feature list.

FIG. 8 is a diagram for generating a D2D user frequency reuse area list.

FIG. 9 is a flow of D2D user access and list update.

Fig. 10 is an example diagram of multiplexed cellular user spectrum by D2D users (taking area A1 and area B1 as examples).

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

First, the application scenario of the method of the present invention is explained: the cellular transmission adopts a frequency division duplex FDD (Frequency Division Duplexing) or a time division duplex TDD (Time Division Duplexing) system. Although the multiplexing of uplink spectrum resources of cellular users by D2D users in the present invention is described by taking an LTE cell system as an example, the method is also applicable to other types of cell systems.

Referring to FIG. 2 , the method for accessing D2D user spectrum in the cellular and D2D communication hybrid system of the present invention is introduced. In this method, the base station implements D2D user spectrum access based on historical statistical information and area division in the system. The method includes the following steps:

Step 1. According to the historical statistical information of the average interference power and density of D2D users in each area of the system, the base station generates a list of D2D user area characteristics in the hybrid cellular and D2D communication system, so that they can be divided according to the tolerable interference of cellular users in the system. The access area of the D2D user.

Referring to Figure 4, the following operations of step 1 are introduced:

(11) The base station first divides the entire cell of the system, that is, the entire range covered by its communication, according to the actual situation and according to the unit area of the set shape and area (such as a square area of the set size), and divides the cell into Multiple small pieces. The unit area is an indivisible area in the cell (for example, as shown in FIG. 2 , the entire cellular communication coverage area is divided into many small blocks by a square unit area with a fixed size).

(12) The base station obtains the geographical location information of the D2D users in the cell by receiving the cell positioning signal of the D2D user or the GPS (Global Positioning System) signal; at the same time, counts the identification ID (IDentity) of all D2D users in the cell to determine The number of D2D users in the system.

(13) The base station detects the amount of interference power caused by D2D users in different geographical locations to the base station by receiving the reference signal RS (reference signal) sent by all D2D users.

(14) After the set time T _D2D collection and statistics, the base station knows the average interference power of D2D users in each unit area of the cell, and the average density value of D2D users in each unit area; the set time The duration of T _D2D is an adjustable value and can be configured according to the actual needs of the system.

(15) According to the above statistical information, the base station merges the unit areas in which the average interference power and the average density of the D2D users are the same to form a new area. It should be noted that the new area may be discontinuous, as long as the average interference power and average density of D2D users in this area are the same.

(16) The base station first arranges the merged areas in descending order according to the average interference power of D2D users from large to small; for areas with the same average interference power of D2D users but different densities, they are arranged in descending order according to the average density of D2D users, so that Construct a list of D2D user characteristics including the average interference power of D2D users to the base station in each area, the average density of D2D users, and the geographic location of D2D users. It should be noted that in the D2D user feature list, only the area area is a configurable variable, and other items are constant values measured based on the original system historical information.

Figure 2 shows a scenario where D2D users are divided into areas in a hybrid system. CeUE1 and CeUE2 in the figure represent cellular user 1 and cellular user 2 in the system, and D2D users in different areas of the system will multiplex cellular users in the system. User's uplink resources. During the initialization operation in step 1, the base station is only responsible for cell area division, D2D user geographic location statistics, D2D user average interference power detection, and the like. The arrows in the figure indicate the interference caused by D2D users to the uplink reception of the base station. According to the average interference power and density of D2D users in the area, the location areas of multiple D2D users can be obtained. All D2D user location areas will cover the entire cellular communication coverage scope. Here, three regions are taken as an example (as shown in FIG. 2 ), which are represented by region A, region B, and region C respectively, and region B is two discontinuous regions.

For the convenience of description, it is assumed that the average interference power generated in the three areas is ranked as I _A > I _B > I _C , and the average density of D2D users in these three areas is obtained through statistics to satisfy I _A > I _B > I _C , and the sorting results are listed in Table 1 below. For example, I _A represents the average interference power of D2D users in area A received by the base station, the variable D _A stores the average density of D2D users in the area, the geographical location variable _LA stores the geographic coordinates of area A, and the area area S _A variable stores the area The size of the area of A.

Table 1. List of D2D user area features

Step 2, according to the interference margin of the cellular users in the system and the resources they occupy, the base station generates a list of the interference margins and resources of the cellular users in the hybrid cellular and D2D communication system.

First, in the present invention, the cellular user interference margin is the maximum signal interference that the base station can withstand when the cellular user sends a signal to the base station with the maximum power and at the same time guarantees the lowest data transmission rate when the cellular user performs uplink communication with the base station.

Since D2D users need to reuse resources of cellular users, it is necessary to generate a list of cellular user interference margins and their resources so as to be directly searched during multiplexing. Therefore, this step 2 includes the following operations (see Figure 5):

(21) The base station calculates the uplink interference margin that each cellular user can withstand by receiving the uplink reference signal of the cellular user, and stores it.

(22) The base station arranges all cellular users in descending order according to the numerical value of the interference margin, and obtains a list of cellular user interference margins and their resources.

As shown in Table 2 below, the cellular user interference margin and its resource list include: cellular user ID, corresponding interference margin value and allocated cellular resource information. For example, ID _C2 represents the cellular user ID corresponding to cellular user 2 (CeUE2), M _C2 represents the interference margin corresponding to cellular user 2 (CeUE2), and resource C2 is located in the last column of the table. The list is sorted in descending order of interference margin values from large to small. Note: In some cases, if a cellular user is allocated multiple discontinuous resources, the resource used at this time refers to the sum of these discontinuous resources.

Table 2. Cellular user interference margin, resource list

serial number Cellular Subscriber ID interference margin cellular resources 1 ID _C2 M _C1 Resource C2 2 ID _C1 M _C2 Resource C1 … … … …

Step 3. The base station compares the obtained cellular user information with the relevant information of D2D users in each area, and obtains the geographical area suitable for D2D users to reuse resources in the system and the corresponding wireless resources, so as to follow the D2D access criteria Initially divide the geographic range of D2D users, and generate a list of D2D user frequency reuse areas.

Referring to Figure 6, the following operations included in step 3 are introduced:

(31) Set the initial values of the two counting variables in the D2D user area feature list and the cellular user interference margin and its resource list respectively: after i=1 and j=1, first obtain the D2D user area feature from the previous steps Select the five parameters in item i from the list: area code, D2D user average interference power, D2D user average density, D2D user geographic location and area area, and then select the first i parameter from the cellular user interference margin and its resource list. Cellular user ID, interference margin and cellular resource of item j;

(32) Calculate and judge whether the selected cellular user interference margin meets the first condition below:

M _Cj ≥ _{S i} ×D _i ×I _i , where M _Cj is the cellular user interference margin value of the jth item in the cellular user interference margin and its resource list, the subscript Cj represents the jth cellular user, and S _i , D _i and I _i are the average interference power of D2D users, the average density of D2D users and the area of the area in the i-th area in the D2D user area feature list, respectively; Note: only the area of the above items is a configurable variable , other parameters are the constant values originally measured based on the historical information of the system.

If the first condition is met, perform the next step (33);

If the first condition is not satisfied, it means that the interference of the D2D user in the i-th area to the j-th cellular user has exceeded the interference margin value, and the system should reduce the area of the i-th area so that the D2D users can reuse When the j-th cellular user spectrum is used, it will not exceed the interference margin value of the j-th cellular user;

The reduction method adopted is: delete the unit areas in the i-th area one by one to reduce the area area of the i-th area until the inequality of the first condition is satisfied; then, the base station updates the D2D user area feature list, so that The area of item i is updated to the reduced area, and at the same time, the deleted unit area is merged, and added to the list as the new item i+1, and the original item i+1 and all subsequent areas are sequentially postponed ; Then jump to step (36).

(33) Determine whether i is the last item in the D2D user area feature list, if yes, jump to step (37); if not, execute subsequent step (34);

(34) Select the following parameters in item i+1 from the list of D2D user area characteristics: area code, D2D user average interference power, D2D user average density, D2D user geographic location and area area, and then judge the i-th Whether the cellular user interference margin in the +1 area satisfies the second condition below:

M _Cj <S _i ×D _i ×I _i +S _i+1 ×D _i+1 ×I _i+1 ; where S _i+1 , D _i+1 and I _i+1 are D2D user area features The average interference power of D2D users, the average density of D2D users and the area area of the area in the i+1 item area in the list; similarly, among the above items, only the area area is a configurable variable, and other parameters are based on the original system Constant value measured by historical information.

If the second condition is met, the next step (35) is performed;

Otherwise, that is, the second condition is not met, jump to step (36);

(35) The base station reduces the area according to the method of step (32), but this time the area is reduced for the i+1th area just added, that is, the unit area in the i+1th area is also deleted one by one, To reduce the region area of the i+1th item region until the second inequality just changes from true to false. Next, the base station updates the D2D user area feature list, and forms the updated i-th area from the original i-th area and the current reduced i+1-th area, and merges the deleted unit areas into a new i-th area After +1 item, add it to the list; then jump to step (37);

(36) The base station combines the i-th item and the i+1-th item as the i-th item, and then, the area item numbers after the original i+1-th item are automatically decremented by 1 (for example, the original i+2 item area is updated to the first item i+1), and then return to step (34).

(37) Detect the list of cellular users, and judge whether the cellular user of the jth item is the last item in the list, if yes, perform step (38); otherwise, increase the counting variables of the two lists by 1, that is, i =i+1 and j=j+1, return to step (33) for loop operation.

(38) Combine the area code of the i-th area obtained in the preceding steps and the resource of the j-th cellular user to form a form of [area code, D2D user multiplexing resources], and add it as a new item To the last item in the D2D user frequency reuse area list. If the i-th area is formed by merging two or more areas, the newly added item should contain multiple [area code, D2D user multiplexing resources] entries, and the area list of each entry is the merged ones The region code for the region.

Here, the above-mentioned cell system is still taken as an example for illustration. First, regions are sequentially selected from the D2D region feature list, and region A is initially selected. If region A does not meet the first condition in step (32): M _C2 <S _A ×D _A ×I _A , it is necessary to reduce the area A according to the above steps, that is, to split the area A to form a new area composed of fewer unit areas; at the same time, merge the deleted unit areas to form Another new area. Assuming that the divided areas are called areas A1 and A2 (as shown in the transformed table in Figure 7), then after the split is completed, area A1 will satisfy the first condition in step (32) (at the same time, At this time, if one more unit area is added to area A1, the first condition will not be satisfied).

Next, judge the next area. If area A2 satisfies the first condition, and the combination of area A2 and area B satisfies the first and second conditions, then it is necessary to narrow down area B in a similar manner as described above. , until the merged region of region A2 and the reduced region B just makes the second condition change from true to false. It is assumed here that the area B is divided into an area B1 and an area B2, then, at this time, the new area B1 also cannot add any more unit areas.

Then, such operations are repeatedly performed in a loop until all cellular user resources or divided areas are processed.

Table 3. List of D2D frequency reuse areas

area code D2D multiplexing resources A1 Resource C2 A2 Resource C1 B1 Resource C1 … …

Step 4, while ensuring the normal communication of cellular users, the base station directly accesses the D2D user spectrum according to different areas, and updates the D2D user area feature list and the D2D user frequency reuse area list according to the user changes in the system.

Referring to Figure 9, the following operations in step 4 are introduced:

(41) It can be seen from the above steps that for any area X in the D2D user frequency reuse area list, the maximum allowed number of D2D users N _max should satisfy the following formula: N _max =S×D; where, X is the code name of a certain area, S and D are the area of area X and the average density of D2D users respectively; therefore, for the multiplexing resource C1 of D2D users in another area A2, the maximum number of allowed D2D users N _max in this area A2 =S _A2 ×D _A .

(42) D2D users send communication requests and reference signals. At this time, the base station directly instructs D2D users in each area to reuse corresponding cellular user resources according to the D2D user frequency reuse area list.

(43) The base station conducts real-time statistics on the number of D2D users in each area. Once the number of D2D users in the counted area is equal to the maximum number of D2D users allowed in the area, it will no longer access the D2D users to the corresponding cellular users. resources.

(44) When the number of D2D users in the corresponding area exceeds the maximum allowable number of D2D users in the area, the system needs to re-shrink the corresponding area in the D2D user area feature list, and update all the D2D user area feature lists after this area. area;

(45) The base station re-allocates the corresponding resources to the above-mentioned areas according to the method in step 3, and the operation of this step only needs to be updated from the area exceeding the maximum allowed number of D2D users.

(46) The base station periodically detects whether the cellular users in the cell have changed, and obtains the receiving power of the base station for each cellular user in the system by detecting the reference signal of the cellular users; if there is a change, update the current cellular user list, and follow step 3 Re-allocate cellular user resources to each area; if there is no change, continue to perform the corresponding access operation.

Still taking the above-mentioned cellular users and D2D users as examples, explain the steps:

Assuming that it is known from the D2D user frequency reuse area list that area A1 and area B1 correspond to the resources of cellular user IDs ID _C2 and ID _C1 respectively, then when D2D users appear in area A1 and area B2, they will directly access the corresponding cellular User resources, as shown in Figure 10.

Regardless of the change of the cellular user interference margin and its resource list, or the change of the D2D user area characteristic list, it is necessary to follow the relevant operation steps in step 3 to reorganize the cellular user interference margin and its resource list and the D2D user area characteristic list. Update, and when updating, you only need to start updating from the changed item (area/cellular user) and its corresponding item (cellular user/area) in the list.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the present invention. within the scope of protection.

Claims (7)

1. honeycomb communicates with terminal direct connection D2D D2D user's frequency spectrum access method in hybrid system, it is characterized in that: described method is that base station adopts the access realizing D2D user's frequency spectrum based on the historical statistical information in this system and Region dividing; The method comprises following operative step:

(1) according to the historical statistical information of D2D user's average interference power and density size in regional in system, base station generates honeycomb and to communicate with D2D D2D user area feature list in hybrid system;

(2) according to the interference margins of phone user in system and the resource information that takies thereof, base station generates honeycomb and to communicate with D2D phone user's interference margins and the Resources list thereof in hybrid system;

(3) relevant information of D2D user in the information of the phone user obtained and regional contrasts by base station, obtain the geographic area and corresponding Radio Resource thereof that are suitable for D2D user's multiplexed resource in this system, thus access criterion initial division D2D user geographic range according to D2D, generate D2D user's channeling zone list;

(4) while guarantee phone user proper communication, the access of D2D user's frequency spectrum is directly carried out in base station according to zones of different, and carries out corresponding renewal according to the user's change in system to D2D user area feature list and D2D user's channeling zone list.

2. method according to claim 1, is characterized in that: the inventive method is applicable to following scene:

Cellular transmission adopts FDD or TDD system; The LTE cellular cell system of the uplink spectrum resource of the multiplexing phone user of D2D user or the cellular cell system of other types.

3. method according to claim 1, is characterized in that, described step (1) comprises following content of operation:

(11) base station is first according to actual conditions in system, and carries out initial division according to the unit area of setting shape and area to the gamut of the whole community of this system, i.e. its communication overlay, and this microzonation is divided into multiple fritter; Not subdivisible region in described unit area Shi Gai community;

(12) base station is by receiving the D2D user's geographical location information in the cell localization signal of D2D user or this community of global position system GPS signal acquisition; Meanwhile, the mark ID of all D2D users in statistics community, to determine the D2D number of users in this system;

(13) base station is by receiving the reference signal RS of all D2D users transmission, detects the interference power size that the D2D user being in diverse geographic location causes base station;

(14) through setting-up time T _d2Dcollection and statistics, base station knows that in this community, each unit area D2D user is to its average interference power, and in each unit area the averag density numerical value of D2D user; This setting-up time T _d2Dduration be the adjustable numerical value be configured according to system actual needs;

(15) according to above-mentioned statistical information, the average interference power of wherein D2D user and the identical unit area of averag density numerical value thereof merge by base station, form new region; It should be noted that, this new region may be discontinuous, as long as but the average interference power of D2D user is identical with average density values in this region;

(16) descending is carried out in the region that base station is first combined from big to small according to the average interference power of D2D user; Average interference power for D2D user is identical and the region that density is different, then according to the size descending of D2D user's averag density, thus build D2D user in the D2D user characteristics list of regional to base station average interference power, D2D user's averag density and D2D user geographical position; It should be noted that: in this D2D user characteristics list, only have region area to be configurable variable, other every constant values be measured by foundation original system historical information.

4. method according to claim 1, is characterized in that, described step (2) comprises following content of operation:

(21) base station calculates the up interference margins size that can bear of each phone user by the uplink reference signals receiving phone user, and stores;

(22) base station carries out descending to all phone users according to interference margins numerical values recited, obtains phone user's interference margins and the Resources list thereof.

5. method according to claim 1, it is characterized in that, described phone user's interference margins is phone user and base station when carrying out uplink communication, and phone user sends a signal to base station with maximum power, when ensureing lowest data transmission rate simultaneously, the peak signal interference that base station can be born;

Described phone user's interference margins and the Resources list thereof comprise: phone user ID, corresponding interference margins numerical value and the cell resource information of distributing; This list arranges from big to small according to interference margins numerical value; And when to be assigned to multiple resource be discontinuous to certain phone user, its resource used is the summation of these discontinuous resources.

6. method according to claim 1, is characterized in that, described step (3) comprises following content of operation:

(31) initial value of two counting variables in D2D user area feature list and phone user's interference margins and the Resources list thereof is set respectively: after i=1 and j=1, select five parameters in i-th in the D2D user area feature list first obtained from abovementioned steps: area code, D2D user's average interference power, D2D user's averag density, D2D user geographical position and region area, then from phone user's interference margins and the Resources list thereof, select the phone user ID of jth item, interference margins and cell resource;

(32) whether calculating and the phone user's interference margins selected by judgement meet following 1st condition:

M _cj>=S _i× D _i× I _i, in formula, M _cjfor phone user's interference margins value of jth item in phone user's interference margins and the Resources list thereof, subscript Cj represents a jth phone user, S _i, D _iand I _ibe respectively the region area in D2D user's average interference power in i-th region in the feature list of D2D user area, D2D user's averag density and this region; If met, then perform subsequent step (33); If do not met, just mean that in i-th region, the interference of D2D user to jth item phone user has exceeded interference margins numerical value, this system should reduce the region area in i-th region, during to make D2D user's multiplexing jth item phone user's frequency spectrum, the interference margins numerical value of jth item phone user can not be exceeded;

The way that reduces adopted is: delete the unit area in i-th region one by one, to reduce the region area in i-th region, until meet the inequality of the 1st condition; Then, base station upgrades D2D user area feature list, makes i-th area update be region after reducing, the unit area of deletion is merged simultaneously, add in this list as new the i-th+1, former the i-th+1 and subsequent regional are postponed all successively meanwhile; Then step (36) is performed;

(33) judge that whether i is last in the feature list of D2D user area, if so, then redirect performs step (37); If not, then perform subsequent step (34);

(34) from the feature list of D2D user area, select the following parameter in the i-th+1: area code, D2D user's average interference power, D2D user's averag density, D2D user geographical position and region area, then judge whether phone user's interference margins in this i-th+1 region meets following second condition:

M _cj< S _i× D _i× I _i+ S _i+1× D _i+1× I _i+1; In formula, S _i+1, D _i+1and I _i+1be respectively the region area in D2D user's average interference power in the i-th+1 region in the feature list of D2D user area, D2D user's averag density and this region; Wherein only have region area to be configurable variable, other parameters are original in the constant value measured by system history information; If met, then perform subsequent step (35); Otherwise namely do not meet above-mentioned condition, then redirect performs step (36);

(35) base station reduces region area according to the method for step (32), but reduce specifically area to as if the i-th+1 region, namely the unit area in the i-th+1 region is deleted in same employing one by one, to reduce the region area in the i-th+1 region, be false until second inequality just becomes from establishment; Then, base station upgrades D2D user area feature list, by the region of original i-th and current reduce after the i-th+1 region form i-th region after upgrading, deleted unit area is merged after new the i-th+1 simultaneously, then adds in list; Then redirect performs step (37);

(36) base station merges i-th and the i-th+1 as i-th, then, after originally the i-th+1 later region bullets then subtracts 1 all automatically, returns and performs step (34);

(37) detect phone user list, judge that whether the phone user of jth item is last of this list, if so, then perform step (38); Otherwise, the counting variable of two lists is increased progressively respectively and adds 1, be i.e. i=i+1 and j=j+1, return and perform step (33);

(38) area code in i-th region abovementioned steps obtained and the resource of jth item phone user be corresponding combination mutually, form [area code, D2D user's multiplexed resource] form, and it can be used as a new last term of adding D2D user's channeling zone list to; If i-th region is formed by plural region merging technique, then this newly interpolation should comprise multiple [area code, D2D user's multiplexed resource] entry, and the zone list of each entry is the area code in those regions merged respectively.

7. method according to claim 1, is characterized in that, described step (4) comprises following content of operation:

(41) from abovementioned steps, for certain region X in any one D2D user's channeling zone list, the D2D number of users N of its maximum permission _maxfollowing formula should be met: N _max=S × D; In formula, X is certain area code, S and D is respectively the region area of region X and the averag density of D2D user; Therefore for the D2D user multiplexed resource C1 in the A2 of another region, maximum permission D2D number of users N on the A2 of this region _max=S _a2× D _a;

(42) D2D user sends communication request and reference signal, and now, base station directly indicates the multiplexing corresponding phone user's resource of the D2D user in regional according to D2D user's channeling zone list;

(43) real-time statistics is carried out to D2D number of users in each region in base station, equals the maximum permission D2D number of users in this region once the D2D number of users in added up region, just no longer accesses D2D user in corresponding phone user's resource;

(44) when the D2D number of users occurred when respective regions exceedes the maximum permission D2D number of users in this region, system also needs again to reduce the corresponding region in the feature list of D2D user area, upgrades all regions in the feature list of D2D user area behind this region simultaneously;

(45) base station according to the method for step (3) again to the corresponding resource of these region allocation above-mentioned, and the operation of this step only need from exceed maximum permission D2D number of users region that upgrade;

(46) in base station cycle detection community, whether phone user changes, and by detecting the reference signal of phone user, obtains the received power of base station for each phone user in system; If changed, then upgrade current phone user's list, and again distribute phone user's resource to regional according to step 3; If do not changed, then continue to perform corresponding access operation.