A D2D Communication Spectrum Allocation Method Based on Location-aware Weighted Graph
A spectrum allocation and weighted graph technology, applied in wireless communication, electrical components, etc., can solve problems such as inability to effectively guarantee the communication quality of cellular users, cross-layer interference of cellular communication links, and same-layer interference
Active Publication Date: 2021-04-09
BEIJING UNIV OF POSTS & TELECOMM
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However, D2D communication multiplexing the frequency spectrum of the cellular network will cause cross-layer interference to the cellular communication link. As the main user of the cellular frequency band, the communication quality should be guaranteed. Reusing the same frequency spectrum for links will cause same-layer interference between each other, so the interference management problem when the cellular network and D2D communication coexist is an urgent problem to be solved
The game theory method models D2D users as game players for competitive games until the Nash equilibrium state, but solving the Nash equilibrium state requires a large amount of information exchange between users, and requires a large number of iterations to converge
The graph theory method uses a graph to model the interference relationship between users, and uses methods such as graph coloring to allocate spectrum, but it cannot effectively guarantee the communication quality of cellular users.
The airspace isolation method can effectively protect the communication quality of cellular users by establishing an interference-limited area for cellular users, but airspace isolation is a very coarse-grained optimization that does not fully utilize spectrum resources
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[0086] In order to make the technical principles of the present invention more clearly understood, the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0087] The present invention relates to a D2D resource allocation method in a heterogeneous network where a cellular network and D2D communication coexist, in particular to a D2D communication spectrum allocation method based on a location-aware weighted graph (LAWG, Location-Aware Weighted Graph Based Spectrum Allocation for D2D Communication) .
[0088] Such as figure 2 As shown, the specific steps include:
[0089] Step 1. Construct a heterogeneous network model in which the cellular network and D2D communication share spectrum;
[0090] Such as figure 1 As shown, the heterogeneous network model includes a cellular base station (BS, Base Station), M cellular downlink users and N D2D communication pairs.
[0091] Set the mth cellular user as C m , wh...
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The invention discloses a D2D communication spectrum allocation method based on a location-aware weighted graph, which belongs to the field of wireless communication. First construct a heterogeneous network model in which the cellular network and D2D communication share spectrum, establish the signal-to-interference-noise ratio SINR of the D2D receiving user and the SINR of the cellular user; then use the SINR of the cellular user and the SINR of the D2D receiving user to calculate the cellular link and D2D The unit bandwidth communication rate of the link; the system capacity is calculated by using the unit bandwidth communication rate of the cellular link and the D2D link, and the maximum system capacity is taken as the optimization goal, and the interruption probability of the cellular user is less than the maximum interruption probability threshold and the D2D link The spectrum allocation constraint is the optimization condition, and the D2D resource allocation optimization model in the heterogeneous network is constructed; the location-aware weighted graph is constructed to optimize the D2D resource allocation optimization model, and the resource allocation scheme of each D2D communication pair is obtained. The invention greatly improves the total capacity of the system and realizes the protection of the communication quality of cellular users.
Description
technical field [0001] The invention belongs to the field of wireless communication, relates to a heterogeneous cellular network system, in particular to a D2D communication frequency spectrum allocation method based on a location-aware weighted graph. Background technique [0002] The popularity of smart terminals and the explosive development of mobile Internet services have put forward higher requirements for the data transmission capabilities of wireless communication networks. Under the current general trend, existing cellular networks have problems such as a shortage of spectrum resources and overloaded base stations, which cannot meet the transmission requirements of future wireless networks. [0003] Device-to-Device (D2D, Device-to-Device) communication allows neighboring users to establish a direct communication link for communication, because it has the advantages of improving spectral efficiency, saving energy consumption, and unloading base station loads, it has...
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IPC IPC(8): H04W72/04H04W72/08H04W72/10H04W72/54
CPCH04W72/51H04W72/541H04W72/542H04W72/56
Inventor郭彩丽李政张荷冯春燕
OwnerBEIJING UNIV OF POSTS & TELECOMM