CN107708137A - A kind of intensive heterogeneous network multipoint cooperative safe transmission method of physical layer - Google Patents
A kind of intensive heterogeneous network multipoint cooperative safe transmission method of physical layer Download PDFInfo
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- CN107708137A CN107708137A CN201710931327.4A CN201710931327A CN107708137A CN 107708137 A CN107708137 A CN 107708137A CN 201710931327 A CN201710931327 A CN 201710931327A CN 107708137 A CN107708137 A CN 107708137A
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Abstract
The invention belongs to mobile communication technology field, more particularly to a kind of intensive heterogeneous network multipoint cooperative safe transmission method of physical layer.A kind of intensive heterogeneous network multipoint cooperative safe transmission method of physical layer, including：Cooperated between judging current network cluster being provided；Judge targeted customer's mobility height；Selecting collaboration serving BS set；Configure the cooperation mode of each base station in collaboration services collection of base stations；Cooperation safe transmission is carried out to targeted customer.The present invention provides a kind of intensive heterogeneous network multipoint cooperative safe transmission method of physical layer, lifts the safety of physical layer performance that intensive heterogeneous network is wirelessly transferred, and enhancing network system resists the ability of potential silent eavesdropping.
Description
Technical Field
The invention belongs to the technical field of mobile communication, and particularly relates to a safe transmission method of a dense heterogeneous network multipoint cooperation physical layer.
Background
The popularization and performance improvement of the intelligent terminal promote the rapid development of wireless data services. However, single-layer macro networks, which seek large coverage areas and homogeneous service optimization, are increasingly difficult to carry exponentially increasing data traffic. The heterogeneous network formed by overlapping the low-power small base stations in the coverage area of the macro base station can improve the reuse rate of space resources and communication coverage.
Furthermore, because the user number distribution and the service density distribution have huge distribution difference in space and time, a large number of small base stations are densely deployed in a hot spot area to form a dense heterogeneous network, so that the high-density user access and service flow requirements in the hot spot area can be better met.
Similar to other wireless networks, the security problem of dense heterogeneous networks is a basic problem in the process of popularization and application. The traditional security technology generally adopts a key encryption means to secure information transmission, and the security performance is at the cost of high computational complexity. Recently, the emerging physical layer security technology utilizes the diversity and time variability of wireless channels and the uniqueness and reciprocity of channel characteristics of both communication parties to ensure the security of wireless communication, and does not depend on the computational complexity and does not need high-level key distribution. The method is very suitable for the dense heterogeneous network with dynamically changed network topology structure.
Meanwhile, the appearance of transmission technologies such as large-scale antennas and multi-point cooperation creates conditions for further application and development of physical layer security technologies while improving network transmission performance. The large-scale antenna and the multi-point cooperation technology are beneficial to expanding the advantages of a legal user channel relative to an eavesdropping channel and further enhancing the security of wireless communication.
However, due to the complexity and dynamics of the topology and node types of the multi-layer dense heterogeneous network, it is difficult for the existing secure transmission method to flexibly adapt to the situation of the multi-layer dense heterogeneous network, which may cause low energy or resource efficiency in a partial area or insufficient security performance in the partial area. Therefore, it is urgent to design a physical layer secure transmission method capable of flexibly adapting to the characteristics of a multi-layer dense heterogeneous network.
Disclosure of Invention
The invention aims to overcome the defects of the existing safe transmission method, provides a dense heterogeneous network multipoint coordinated physical layer safe transmission method, improves the physical layer safety performance of dense heterogeneous network wireless transmission, and enhances the capability of a network system for resisting potential silent eavesdropping.
In order to achieve the purpose, the invention adopts the following technical scheme:
a dense heterogeneous network multipoint cooperation physical layer secure transmission method comprises the following steps:
step 1: judging whether the current network can provide inter-cluster cooperation;
and 2, step: judging the mobility of a target user;
and 3, step 3: selecting a cooperative service base station set;
and 4, step 4: configuring a cooperation mode of each base station in a cooperation service base station set;
and 5: and performing cooperative secure transmission on the target user.
Preferably, the step 3 comprises:
selecting a cooperation service base station set according to whether the current network can provide inter-cluster cooperation and the mobility of a target user, and respectively executing the following steps:
step 31: if the current network can provide inter-cluster cooperation and the target user has low mobility, all base stations which receive signals-to-interference-and-noise ratios larger than a threshold value beta at the target user are selected from all base stations which can provide service to form a cooperation service base station set phi C,L : the signal received at the target user is represented as:
the signal-to-interference-and-noise ratio of any base station received at the target user is expressed as:
wherein, SINR (B) m,n U) is a base station B i,j The signal to interference and noise ratio of the target user u,denotes the set of all base stations in the whole network, phi i Represents the set of all base stations of the ith layer, i ∈ [1,K ∈]，B i,j Denotes the jth base station in the ith layer, D (i,j),u Represents base station B i,j Distance from user u, a i In order to be a path loss index,represents base station B i,j The channel vector with the user u and,represents base station B i,j The precoding vector to be used is selected such that,represents base station B i,j The artificial noise coding vector used, N i For transmitting antenna in i-th layerNumber, s i,j Represents base station B i,j A transmitted signal symbol andσ u representing additive thermal noise, B m,n For the nth base station in the mth layer, u is the target user, P m Is the maximum transmission power, P, of all base stations in the mth layer i Maximum transmit power for all base stations in layer i, D (m,n),u Represents base station B m,n The distance to the user u is determined,represents base station B m,n Channel vector with user u, N m Is the number of transmitting antennas in the mth layer,represents base station B m,n The precoding vector to be used is selected such that,represents base station B m,n The artificial noise coding vector used;
step 32: if the current network can provide inter-cluster cooperation and the target user has high mobility, all base stations with the received signal to interference plus noise ratio larger than a threshold value gamma at the user position are selected from all macro base stations capable of providing service to form a service base station set phi H,L ；
Step 33: if the current network can not provide inter-cluster cooperation and the target user has low mobility, judging whether the current network is in the coverage range of a certain base station cluster; according to whether the base station is in the coverage area of a certain base station cluster, the following processes are respectively executed:
step 331: if the current network can not provide inter-cluster cooperation and the target user has low mobility and is in the coverage range of a certain base station cluster, selecting base stations capable of providing service from all base stations densely deployed in cluster form to form a candidate service base station set phi Cand,L (ii) a In candidate service base station set phi Cand,L In and belong to a base station cluster phi i,j Is counted as n i,j (ii) a If all n i,j Is n m,n Corresponding cluster of base stations is phi m,n Then the cooperative serving base station set phi of the user C,L ＝Φ Cand,L ∩Φ m,n ；
Step 332: if the current network can not provide inter-cluster cooperation and the target user has low mobility and is not in the coverage range of a certain base station cluster, selecting a base station with the largest received signal-to-interference-and-noise ratio at the user position from all base stations capable of providing service as a candidate service base station;
step 34: and if the current network can not provide inter-cluster cooperation and the target user has high mobility, selecting a base station with the largest received signal-to-interference-and-noise ratio at the user from all the macro base stations capable of providing service as a candidate service base station.
Preferably, the step 4 comprises:
corresponding to different execution processes in the step 3, the step 4 is respectively as follows:
step 41: if the current network can provide inter-cluster cooperation and the target user mobility is low, phi will be C,L The transmitting base station with the largest receiving signal-to-interference-and-noise ratio at the user is denoted as B L,Max The transmitting base station with the smallest received signal-to-interference-and-noise ratio is denoted as B L,Min With L L,a Is represented by B L,Max With target user u L At a distance of L from each other L,b Is represented by B L,Min With target user u L For phi, of C,L Arbitrary base station B in (1) i,j The transmission and interference power ratio coefficient selection strategy is as follows:
step 42: if the current network can provide inter-cluster cooperation and the target user has high mobility, for phi H,L Arbitrary base station B in (1) i,j Phi of i,j The selection strategy is as follows:
step 431: if the current network can not provide inter-cluster cooperation and the target user has low mobility and is in the coverage range of a certain base station cluster, for phi C,L Any base station B in (1) i,j Phi of i,j The selection strategy is as follows:
preferably, the step 5 comprises:
corresponding to different execution processes in step 4, step 5 is as follows:
step 51: if the current network can provide inter-cluster cooperation and the target user mobility is low, phi C,L All phi in i,j The base stations which are not 0 form a distributed antenna through joint cooperation to transmit target users;
step 52: if the current network can provide inter-cluster cooperation and the target user has high mobility, phi H,L All phi in i,j The base stations which are not 0 form a distributed antenna through joint cooperation to transmit target users;
step 531: if the current network can not provide inter-cluster cooperation and the target user has low mobility and is in the coverage range of a certain base station cluster, phi C,L All phi in i,j The base stations which are not 0 form a distributed antenna through joint cooperation to transmit target users;
step 532: if the current network can not provide inter-cluster cooperation and the target user has low mobility and is not in the coverage range of a certain base station cluster, transmitting the target user by the candidate service base station;
step 54: and if the current network can not provide inter-cluster cooperation and the target user has high mobility, transmitting the target user by the candidate service base station.
Preferably, the method is suitable for K layers of dense heterogeneous networks, K is more than or equal to 2, wherein the layer 1 is a macro base station, and the layers 2 to K are small base stations, and the method comprises the following steps: the system comprises a micro base station, a pico base station and a femto base station, wherein at least one layer from 2 to K layers is densely clustered; the method is also applicable to, but not limited to, common multi-layer heterogeneous networks, single-layer dense networks, and common single-layer networks.
Preferably, the common multilayer heterogeneous network means that all layers of base stations in a K-layer network are not deployed in a dense cluster, the single-layer dense network means that K =1 and the base stations in the layer are deployed in a dense cluster, and the common single-layer network means that K =1 and the base stations in the layer are not deployed in a dense cluster.
Preferably, the target user includes: the system comprises mobile terminal equipment used by an access point user, wearable intelligent equipment used by the access point user and Internet of things equipment used by the access point user.
Preferably, the base station includes: macro base stations, micro base stations, pico base stations, femto base stations, WIFI hotspots and relay stations in the cellular network.
Preferably, the steps 31, 41, 51, 32, 42, 52, 331, 431, 531, 332, 532, 34 and 54 are respectively performed.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a dense heterogeneous network multipoint cooperation physical layer secure transmission method, which is characterized in that a distributed antenna is formed by fully utilizing base stations capable of providing cooperation in a network, cooperation parameters of all the base stations are dynamically adjusted according to whether the current network where a target user is located can provide inter-cluster cooperation, the mobility of the target user and the relative position between each base station and the target user, and cooperation secure transmission which is helpful for resisting potential passive eavesdropping is provided for the target user. The method specifically comprises the following steps: when a random user applying for accessing to the dense heterogeneous network is processed, the random user is called a target user, and whether the current network where the target user is located can provide inter-cluster cooperation is judged at first; judging the mobility of the target user; selecting all base stations capable of meeting the SINR (received signal to interference plus noise ratio) requirement of the target user from all base stations capable of providing service for the target user to form a cooperative service base station set; configuring corresponding base station cooperation modes according to whether the network can provide inter-cluster cooperation, the mobility of the target user and the relative position between each cooperation service base station and the target user; and carrying out cooperative secure transmission on the target user by the corresponding base station in the cooperative service base station set.
In the invention, the distributed antenna is formed by multipoint cooperation of the small base stations such as the micro base station, the micro base station and the femto base station which are suitable around the target user, and is matched with the centralized large-scale antenna equipped by the peripheral macro base stations, so that the maximization of the safe transmission rate of the target user is realized.
Drawings
Fig. 1 is a basic flowchart of a method for secure transmission in a multipoint cooperative physical layer of a dense heterogeneous network according to the present invention.
Fig. 2 is a second basic flowchart of a method for secure transmission in a multipoint coordination physical layer of a dense heterogeneous network according to the present invention.
Fig. 3 is a schematic diagram of a dense base station cluster in a dense heterogeneous network according to the method for secure transmission of a multipoint cooperation physical layer in the dense heterogeneous network of the present invention.
Fig. 4 is a schematic diagram of inter-cluster cooperation of a dense heterogeneous network multipoint cooperation physical layer secure transmission method of the present invention.
Fig. 5 is a schematic diagram of a multi-layer dense heterogeneous network of the method for secure transmission of a multipoint cooperation physical layer of the dense heterogeneous network of the present invention.
Fig. 6 is a third basic flowchart of a method for secure transmission in a multipoint coordination physical layer of a dense heterogeneous network according to the present invention.
Fig. 7 is a fourth basic flowchart of a method for secure transmission in a coordinated multi-point physical layer of a dense heterogeneous network according to the present invention.
Fig. 8 is a fifth basic flowchart illustrating a method for secure transmission in a multipoint cooperative physical layer of a dense heterogeneous network according to the present invention.
Fig. 9 is a sixth schematic flowchart of a basic process of a dense heterogeneous network multipoint coordinated physical layer secure transmission method of the present invention.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
the first embodiment is as follows:
as shown in fig. 1, the method for secure transmission of a dense heterogeneous network multipoint coordination physical layer of the present invention includes the following steps:
step S101: judging whether the current network can provide inter-cluster cooperation;
step S102: judging the mobility of a target user;
step S103: selecting a cooperative service base station set;
step S104: configuring a cooperation mode of each base station in a cooperation service base station set;
step S105: and performing cooperative secure transmission on the target user.
It is worth to be noted that the method is suitable for a K-layer dense heterogeneous network, K is more than or equal to 2, wherein the layer 1 is a macro base station, and the layers 2 to K are small base stations, and the method comprises the following steps: the system comprises a micro base station, a pico base station and a femto base station, wherein at least one layer from 2 to K layers is densely clustered; the method is also applicable to but not limited to common multilayer heterogeneous networks, single-layer dense networks and common single-layer networks;
the common multilayer heterogeneous network refers to that base stations of all layers in a K layer network are not in dense cluster deployment, the single-layer dense network refers to that K =1 and the base stations of the layer are in dense cluster deployment, and the common single layer network refers to that K =1 and the base stations of the layer are not in dense cluster deployment;
the user includes: the mobile terminal equipment used by the user, the wearable intelligent equipment used by the user and the Internet of things equipment belonging to the user;
the base station includes: macro base stations, micro base stations, pico base stations, femto base stations, WIFI hotspots and relay stations in the cellular network.
Example two:
as shown in fig. 2-5, another dense heterogeneous network multipoint cooperation physical layer secure transmission method of the present invention includes the following steps:
step S201: user u L As a target user, first, it is determined whether a current network where the target user is located can provide inter-cluster cooperation, and fig. 3 is a schematic diagram of a dense base station cluster in a dense heterogeneous network; target user u L The current network can provide inter-cluster cooperation, and fig. 4 is a schematic diagram of inter-cluster cooperation;
step S202: then, judging the mobility of the target user, wherein the mobility of the target user is low;
step S203: selecting all base stations with received signal-to-interference-and-noise ratio larger than threshold value beta from all base stations capable of providing service to form cooperative service base station set phi C,L ：
The signal received at the target user is represented as:
the signal-to-interference-and-noise ratio of any base station received at the target user is expressed as:
wherein, SINR (B) m,n U) is a base station B i,j The signal-to-interference-and-noise ratio of the user u, u being the target user,denotes the set of all base stations in the whole network, phi i Represents the set of all base stations of the ith layer, i ∈ [1,K ∈]，B i,j Denotes the jth base station in the ith layer, D (i,j),u Represents base station B i,j Distance from user u, α i In order to be a path loss index,represents base station B i,j The channel vector with the user u,represents base station B i,j The pre-coding vector to be used is,represents base station B i,j Artificial noise coding vector, N, used i Number of transmitting antennas in i-th layer, for i>, 1, usually N i ＝1，s i,j Represents base station B i,j A transmitted signal symbol andσ u representing additive thermal noise, B m,n Is the nth base station in the mth layer, u is the target user, P m Is the maximum transmission power, P, of all base stations in the mth layer i Maximum transmission power for all base stations in the i-th layer, D (m,n),u Represents base station B m,n The distance to the user u is determined,represents base station B m,n Channel vector with user u, N m Number of transmitting antennas in mth layer, for m>, 1, usually N m ＝1，Represents base station B m,n The precoding vector to be used is selected such that,represents base station B m,n The artificial noise coding vector used;
step S204: will phi C,L The transmitting base station with the largest receiving signal-to-interference-and-noise ratio at the user is denoted as B L,Max Transmitting base with minimum receiving signal interference noise ratioStation is denoted as B L,Min With L L,a Is represented by B L,Max With target user u L At a distance of L from each other L,b Is shown as B L,Min With target user u L For phi, of C,L Any base station B in (1) i,j The transmission and interference power matching coefficient selection strategy is as follows:
step S205: then phi C,L All phi in i,j The base stations which are not 0 form a distributed antenna through joint cooperation, and the u is paired L And carrying out transmission.
As a practical way, the value of the threshold β is 0.1892.
It is worth to be noted that the method is suitable for a K-layer dense heterogeneous network, K is more than or equal to 2, wherein the layer 1 is a macro base station, and the layers 2 to K are small base stations, and the method comprises the following steps: a micro base station, a pico base station, and a femto base station, wherein at least one of 2 to K layers is deployed in a dense cluster, and a schematic diagram of a multi-layer dense heterogeneous network when K =3 is shown in fig. 5; the method is also applicable to but not limited to common multilayer heterogeneous networks, single-layer dense networks and common single-layer networks;
the common multilayer heterogeneous network means that base stations of all layers in a K layer network are not in dense cluster deployment, the single-layer dense network means that K =1 and the base stations of the layer are in dense cluster deployment, and the common single layer network means that K =1 and the base stations of the layer are not in dense cluster deployment;
the target user includes: the mobile terminal equipment used by the access point user, the wearable intelligent equipment used by the access point user and the Internet of things equipment used by the access point user;
the base station includes: macro base stations, micro base stations, pico base stations, femto base stations, WIFI hotspots and relay stations in the cellular network.
Example three:
as shown in fig. 6, the method for secure transmission of a dense heterogeneous network multipoint coordination physical layer of the present invention includes the following steps:
step S301: user u L As a target user, firstly, whether the current network where the target user is located can provide inter-cluster cooperation is judged, and the target user u L The current network can provide inter-cluster cooperation;
step S302: judging the mobility of the target user, wherein the mobility of the target user is high;
step S303: selecting all base stations with received signal-to-interference-and-noise ratio larger than threshold value gamma from all macro base stations capable of providing service to form service base station set phi H,L ；
Step S304: will phi H,L The transmitting base station with the largest receiving signal-to-interference-and-noise ratio at the user is denoted as B L,Max The transmitting base station with the lowest received signal-to-interference-and-noise ratio is denoted as B L,Min With L L,a Is represented by B L,Max With target user u L At a distance of L from each other L,b Is represented by B L,Min With target user u L For phi, of H,L Any base station B in (1) i,j Phi of i,j The selection strategy is as follows:
step S305: then phi H,L All phi in i,j The base stations which are not 0 form a distributed antenna through joint cooperation, and the u is paired L And carrying out transmission.
As a practical way, the threshold value γ is 0.4142.
It is worth to be noted that the method is suitable for a K-layer dense heterogeneous network, K is more than or equal to 2, wherein the layer 1 is a macro base station, and the layers 2 to K are small base stations, and the method comprises the following steps: a micro base station, a pico base station, and a femto base station, wherein at least one of 2 to K layers is deployed in a dense cluster, and a schematic diagram of a multi-layer dense heterogeneous network when K =3 is shown in fig. 5; the method is also applicable to but not limited to common multilayer heterogeneous networks, single-layer dense networks and common single-layer networks;
the common multilayer heterogeneous network means that base stations of all layers in a K layer network are not in dense cluster deployment, the single-layer dense network means that K =1 and the base stations of the layer are in dense cluster deployment, and the common single layer network means that K =1 and the base stations of the layer are not in dense cluster deployment;
the target user includes: the mobile terminal equipment used by the access point user, the wearable intelligent equipment used by the access point user and the Internet of things equipment used by the access point user;
the base station includes: macro base stations, micro base stations, pico base stations, femto base stations, WIFI hotspots and relay stations in the cellular network.
Example four:
as shown in fig. 7, another dense heterogeneous network multipoint coordination physical layer secure transmission method of the present invention includes the following steps: step S401: user u L As a target user, firstly, whether the current network where the target user is located can provide inter-cluster cooperation is judged, and the target user u L The current network in which the network is located cannot provide inter-cluster cooperation;
step S402: then, judging the mobility of the target user, wherein the mobility of the target user is low;
step S403: judging whether a target user is in the coverage range of a certain base station cluster or not, wherein the target user is in the coverage range of the certain base station cluster;
step S404: selecting base stations capable of providing service from all base stations densely deployed in cluster form to form a candidate service base station set phi Cand,L (ii) a In candidate service base station set phi Cand,L In and belong to a base station cluster phi i,j Is counted as n i,j (ii) a If all n i,j Is n m,n Corresponding cluster of base stations is phi m,n Then the cooperative serving base station set phi of the user C,L ＝Φ Cand,L ∩Φ m,n ；
Step S405: for phi C,L Ren inIntentional base station B i,j Phi of i,j The selection strategy is as follows:
step S406: phi C,L All phi in i,j The base stations which are not 0 form a distributed antenna through joint cooperation, and the pair u L And carrying out transmission.
It is worth to explain that the method is suitable for K layers of dense heterogeneous networks, K is more than or equal to 2, wherein the layer 1 is a macro base station, and the layers from 2 to K are small base stations, and the method comprises the following steps: a micro base station, a pico base station, and a femto base station, wherein at least one of 2 to K layers is deployed in a dense cluster, and a schematic diagram of a multi-layer dense heterogeneous network when K =3 is shown in fig. 5; the method is also applicable to but not limited to common multilayer heterogeneous networks, single-layer dense networks and common single-layer networks;
the common multilayer heterogeneous network means that base stations of all layers in a K layer network are not in dense cluster deployment, the single-layer dense network means that K =1 and the base stations of the layer are in dense cluster deployment, and the common single layer network means that K =1 and the base stations of the layer are not in dense cluster deployment;
the target user includes: the mobile terminal equipment used by the access point user, the wearable intelligent equipment used by the access point user and the Internet of things equipment used by the access point user;
the base station includes: macro base stations, micro base stations, pico base stations, femto base stations, WIFI hotspots and relay stations in the cellular network.
Example five:
as shown in fig. 8, another dense heterogeneous network multipoint coordination physical layer secure transmission method of the present invention includes the following steps: step S501: user u L As a target user, firstly, whether the current network where the target user is located can provide inter-cluster cooperation is judged, and the target user u L The current network in which the network is located cannot provide inter-cluster cooperation;
step S502: then, judging the mobility of the target user, wherein the mobility of the target user is low;
step S503: judging whether a target user is in the coverage range of a certain base station cluster or not, wherein the target user is not in the coverage range of the certain base station cluster;
step S504: selecting a base station with the largest received signal-to-interference-and-noise ratio at a user from all base stations capable of providing service as a candidate service base station;
step S505: judging whether the SINR of the candidate service base station received by the user is larger than a threshold value beta, if so, taking the candidate service base station as a service base station and aiming at a target user u L Carrying out transmission; if not, an interrupt occurs.
As an implementation, the threshold value β is 0.1892.
It is worth to be noted that the method is suitable for a K-layer dense heterogeneous network, K is more than or equal to 2, wherein the layer 1 is a macro base station, and the layers 2 to K are small base stations, and the method comprises the following steps: a micro base station, a pico base station, and a femto base station, wherein at least one of 2 to K layers is deployed in a dense cluster, and a schematic diagram of a multi-layer dense heterogeneous network when K =3 is shown in fig. 5; the method is also applicable to but not limited to common multilayer heterogeneous networks, single-layer dense networks and common single-layer networks;
the common multilayer heterogeneous network means that base stations of all layers in a K layer network are not in dense cluster deployment, the single-layer dense network means that K =1 and the base stations of the layer are in dense cluster deployment, and the common single layer network means that K =1 and the base stations of the layer are not in dense cluster deployment;
the target user includes: the mobile terminal equipment used by the access point user, the wearable intelligent equipment used by the access point user and the Internet of things equipment used by the access point user;
the base station includes: macro base stations, micro base stations, pico base stations, femto base stations, WIFI hotspots and relay stations in the cellular network.
Example six:
as shown in FIG. 9, another aspect of the present inventionA dense heterogeneous network multipoint cooperation physical layer secure transmission method comprises the following steps: step S601: user u L As a target user, firstly, whether the current network where the target user is located can provide inter-cluster cooperation is judged, and the target user u L The current network can not provide inter-cluster cooperation;
step S602: then, judging the mobility of the target user, wherein the mobility of the target user is high;
step S603: selecting a base station with the largest received signal-to-interference-and-noise ratio at a user from all macro base stations capable of providing service as a candidate service base station;
step S604: judging whether the signal-to-interference-and-noise ratio SINR of the candidate service base station received by the user is larger than a threshold value gamma, if so, taking the candidate service base station as a service base station and aiming at a target user u L Carrying out transmission; if not, an interrupt occurs.
As a practical way, the threshold value γ is 0.4142.
It is worth to be noted that the method is suitable for a K-layer dense heterogeneous network, K is more than or equal to 2, wherein the layer 1 is a macro base station, and the layers 2 to K are small base stations, and the method comprises the following steps: a micro base station, a pico base station, and a femto base station, wherein at least one of 2 to K layers is deployed in a dense cluster, and a schematic diagram of a multi-layer dense heterogeneous network when K =3 is shown in fig. 5; the method is also applicable to but not limited to common multilayer heterogeneous networks, single-layer dense networks and common single-layer networks;
the common multilayer heterogeneous network means that base stations of all layers in a K layer network are not in dense cluster deployment, the single-layer dense network means that K =1 and the base stations of the layer are in dense cluster deployment, and the common single layer network means that K =1 and the base stations of the layer are not in dense cluster deployment;
the target user includes: the system comprises mobile terminal equipment used by an access point user, wearable intelligent equipment used by the access point user and Internet of things equipment used by the access point user;
the base station includes: macro base stations, micro base stations, pico base stations, femto base stations, WIFI hotspots and relay stations in the cellular network.
The above shows only the preferred embodiments of the present invention, and it should be noted that it is obvious to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements should also be considered as the protection scope of the present invention.
Claims (9)
1. A dense heterogeneous network multipoint cooperation physical layer secure transmission method is characterized by comprising the following steps:
step 1: judging whether the current network can provide inter-cluster cooperation;
step 2: judging the mobility of a target user;
and 3, step 3: selecting a cooperative service base station set;
and 4, step 4: configuring a cooperation mode of each base station in a cooperation service base station set;
and 5: and performing cooperative secure transmission on the target user.
2. The method for secure transmission of the dense heterogeneous network multipoint coordination physical layer according to claim 1, wherein the step 3 comprises:
selecting a cooperation service base station set according to whether the current network can provide inter-cluster cooperation and the mobility of a target user, and respectively executing the following steps:
step 31: if the current network can provide inter-cluster cooperation and the target user has low mobility, all base stations which receive signals-to-interference-and-noise ratios larger than a threshold value beta at the target user are selected from all base stations which can provide service to form a cooperation service base station set phi C,L : the signal received at the target user is represented as:
the signal-to-interference-and-noise ratio of any base station received at the target user is expressed as:
wherein, SINR (B) m,n U) is a base station B i,j The signal to interference plus noise ratio of target user u,denotes the set of all base stations in the whole network, phi i Represents the set of all base stations of the ith layer, i ∈ [1,K ∈]，B i,j Denotes the jth base station in the ith layer, D (i,j),u Represents base station B i,j Distance from user u, α i In order to be a path loss index,represents base station B i,j The channel vector with the user u,represents base station B i,j The precoding vector to be used is selected such that,represents base station B i,j The artificial noise coding vector used, N i Number of transmitting antennas in i-th layer, s i,j Represents base station B i,j A transmitted signal symbol andσ u representing additive thermal noise, B m,n Is the nth base station in the mth layer, u is the target user, P m Is the maximum transmission power, P, of all base stations in the mth layer i Maximum transmission power for all base stations in the i-th layer, D (m,n),u Represents base station B m,n The distance to the user u is determined,represents base station B m,n Channel vector with user u, N m Is the number of transmit antennas in the mth layer,represents base station B m,n The precoding vector to be used is selected such that,represents base station B m,n The artificial noise coding vector used;
step 32: if the current network can provide inter-cluster cooperation and the target user has high mobility, all base stations with the received signal-to-interference-and-noise ratio larger than a threshold value gamma at the user position are selected from all macro base stations capable of providing service to form a service base station set phi H,L ；
Step 33: if the current network can not provide inter-cluster cooperation and the target user has low mobility, judging whether the current network is in the coverage range of a certain base station cluster; according to whether the base station is in the coverage area of a certain base station cluster, the following processes are respectively executed:
step 331: if the current network can not provide inter-cluster cooperation and the target user has low mobility and is in the coverage range of a certain base station cluster, selecting base stations capable of providing service from all base stations densely deployed in cluster form to form a candidate service base station set phi Cand,L (ii) a In candidate service base station set phi Cand,L In and belong to a base station cluster phi i,j Is counted as n i,j (ii) a If all n i,j Is n m,n Corresponding cluster of base stations is phi m,n Then the cooperative serving base station set phi of the user C,L ＝Φ Cand,L ∩Φ m,n ；
Step 332: if the current network can not provide inter-cluster cooperation and the target user has low mobility and is not in the coverage range of a certain base station cluster, selecting a base station with the largest received signal to interference plus noise ratio at the user position from all base stations capable of providing service as a candidate service base station;
step 34: and if the current network can not provide inter-cluster cooperation and the target user has high mobility, selecting a base station with the largest received signal-to-interference-and-noise ratio at the user from all the macro base stations capable of providing service as a candidate service base station.
3. The method for secure transmission of the dense heterogeneous network multipoint coordination physical layer according to claim 2, wherein the step 4 comprises:
corresponding to different execution processes in the step 3, the step 4 is respectively as follows:
step 41: if the current network can provide inter-cluster cooperation and the target user mobility is low, phi will be C,L The transmitting base station with the largest receiving signal-to-interference-and-noise ratio at the user is denoted as B L,Max The transmitting base station with the smallest received signal-to-interference-and-noise ratio is denoted as B L,Min With L L,a Is shown as B L,Max With target user u L At a distance of L from each other L,b Is represented by B L,Min With target user u L For phi, of C,L Any base station B in (1) i,j The transmission and interference power ratio coefficient selection strategy is as follows:
step 42: if the current network can provide inter-cluster cooperation and the target user has high mobility, for phi H,L Any base station B in (1) i,j Phi of i,j The selection strategy is as follows:
step 431: if the current network can not provide inter-cluster cooperation and the target user has low mobility and is in the coverage range of a certain base station cluster, for phi C,L Any base station B in (1) i,j Phi of i,j The selection strategy is as follows:
4. the method for secure transmission of the dense heterogeneous network multipoint coordination physical layer according to claim 2, wherein the step 5 comprises:
corresponding to different execution processes in step 4, step 5 is as follows:
step 51: if the current network can provide inter-cluster cooperation and the target user mobility is low, phi C,L All phi in i,j The base stations which are not 0 form a distributed antenna through joint cooperation to transmit target users;
step 52: if the current network can provide inter-cluster cooperation and the target user mobility is low, phi C,L All phi in i,j The base stations which are not 0 form a distributed antenna through joint cooperation to transmit target users;
step 531: if the current network can not provide inter-cluster cooperation and the target user has low mobility and is in the coverage range of a certain base station cluster, phi C,L All phi in i,j The base stations which are not 0 form a distributed antenna through joint cooperation to transmit target users;
step 532: if the current network can not provide inter-cluster cooperation and the target user has low mobility and is not in the coverage range of a certain base station cluster, the candidate serving base station transmits the target user;
step 54: and if the current network can not provide inter-cluster cooperation and the target user has high mobility, the candidate service base station transmits the target user.
5. The method for the secure transmission of the multipoint cooperative physical layer of the dense heterogeneous network according to claim 1, wherein the method is applied to a K-layer dense heterogeneous network, K is greater than or equal to 2, wherein the layer 1 is a macro base station, and the layers 2 to K are small base stations, and the method comprises the following steps: the system comprises a micro base station, a pico base station and a femto base station, wherein at least one layer from 2 to K layers is in intensive cluster deployment; the method is also applicable to, but not limited to, common multi-layer heterogeneous networks, single-layer dense networks, and common single-layer networks.
6. The method according to claim 5, wherein the common multi-layer heterogeneous network means that all base stations of all layers in a K-layer network are not deployed in a dense cluster, the single-layer dense network means K =1 and the base stations of the layer are deployed in a dense cluster, and the common single-layer network means K =1 and the base stations of the layer are not deployed in a dense cluster.
7. The dense heterogeneous network multipoint coordination physical layer secure transmission method according to claims 1-6, wherein the target user comprises: the mobile terminal equipment used by the access point user, the wearable intelligent equipment used by the access point user and the Internet of things equipment used by the access point user.
8. The method for dense heterogeneous network multipoint coordinated physical layer secure transmission according to claims 1, 2, 3, 4, and 6, wherein the base station comprises: macro base stations, micro base stations, pico base stations, femto base stations, WIFI hotspots and relay stations in the cellular network.
9. The method for the secure transmission of the physical layer for the multipoint cooperation of the dense heterogeneous network as claimed in claims 2 to 5, wherein the steps 31, 41, 51, 32, 42, 52, 331, 431, 531, 332, 532 and 34, 54 are applied respectively.
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