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Heterogeneous C-RAN network and D2D communication mode selection and resource scheduling combined optimization method in network

A communication mode and network technology, applied in wireless communication, electrical components, etc., can solve problems such as low signal-to-noise ratio, ignoring user fairness, and unsatisfied user data flow

Active Publication Date: 2016-06-01
HARBIN INST OF TECH
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  • Summary
  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

At present, the mode selection of D2D communication that has been studied more is usually limited to D2D communication in a single cell, and whether the system throughput is maximized is the criterion for mode selection. This method ignores the communication between users in the entire D2D communication network. fairness, does not apply
At any time, the user's mode selection should be based on the current user's instantaneous rate and the fairness among users. If the scheduler always selects users with high rates to transmit information, then the data traffic requirements of users with low SNR will be reduced. less than satisfied

Method used

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  • Heterogeneous C-RAN network and D2D communication mode selection and resource scheduling combined optimization method in network
  • Heterogeneous C-RAN network and D2D communication mode selection and resource scheduling combined optimization method in network
  • Heterogeneous C-RAN network and D2D communication mode selection and resource scheduling combined optimization method in network

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specific Embodiment approach 1

[0077] Specific implementation mode one: combine Image 6 Describe this embodiment. This embodiment describes that when the network is in a lightly loaded state, there are sufficient idle uplinks and downlinks to choose from. Therefore, only the cellular mode and the dedicated mode are considered, and because the same The average transmission rate of DUs in the two modes for the previous time slot is the same, so it is only necessary to compare the instantaneous rate of DUs in the two modes. When calculating the maximum instantaneous rate in cellular mode and dedicated mode, there is no inter-channel interference problem, so when the user uses the maximum transmit power, the obtained instantaneous rate can be maximized. The specific algorithm can be realized through the following steps:

[0078] Step A1: Determine whether the D2D user logarithm k is less than the total logarithm K, if less, go to step A2, otherwise the algorithm ends;

[0079] Step A2: Maximum Rate in Cellul...

specific Embodiment approach 2

[0093] Specific implementation mode two: combination Figure 7 Describe this implementation mode. This implementation mode describes that in the state of heavy network load, there is no idle spectrum to use, and D2D users can only choose the multiplexing mode, which is realized by the following steps:

[0094] Step B1: Arrange the D2D users in descending order according to the value of the proportional fairness function. The larger the proportional fairness function, the higher the priority;

[0095] Step B2: Since the average transmission rate of D2D users is known, the maximum value of the proportional fairness function can be selected through the maximum instantaneous rate; in the case of ensuring a certain SINR of D2D users and cellular users, the D2D user with the highest priority can start from Select the resources of the instantaneous rate from all the reusable spectrum for multiplexing, the maximum instantaneous rate It can be calculated by the following formula:

[0...

specific Embodiment approach 3

[0106] Specific implementation mode three: combination Figure 8 Describe this embodiment. This embodiment describes that when the network is in a moderately loaded state, D2D users need to choose a mode among the three modes of cellular mode, dedicated mode and multiplexing mode with the size of the proportional fairness function as the criterion . In this network state, since the number of D2D logarithms is greater than the number of available idle spectrums, D2D users need to choose from three modes. Since D2D working in multiplexing mode will cause interference to cellular users, D2D users will preferentially choose cellular mode or dedicated mode for communication when there is idle spectrum. The D2D joint mode selection and resource scheduling algorithm under moderate network load can be realized through the following steps:

[0107] Step C1: Arrange the D2D users in descending order according to the value of the proportional fairness function. The larger the proportio...

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Abstract

The invention, which belongs to the D2D communication network resource distribution field, relates to a heterogeneous C-RAN network and a D2D communication mode selection and resource scheduling combined optimization method in a network. Therefore, a problem of fairness among users during the D2D communication network mode selection process can be solved and the requirement of network fairness by the D2D user can be met. In the heterogeneous C-RAN network for realizing D2D communication network mode selection, coexisting multi-layer networks are constructed; and a D2D network has a cellular mode, a special mode and a multiplexing mode for selection. In addition, the D2D communication mode selection and resource scheduling combined optimization method in the heterogeneous C-RAN network is characterized in that corresponding mode selection and resource scheduling are provided according to different states of network load situations including a light load situation, a medium load situation, and a heavy load situation, so that the total throughput capacity of the system is maximized under the circumstances that the minimum signal to interference plus noise ratio of the D2D user and the cellular user as well as fairness among D2D users is guaranteed. The network and the method are suitable for D2D communication mode selection and resource scheduling.

Description

technical field [0001] The invention relates to a heterogeneous C-RAN network considering user fairness and a joint optimization method for D2D communication mode selection and resource scheduling under the network, belonging to the field of D2D communication network resource allocation. Background technique [0002] With the huge increase in the number of mobile multimedia users, 4G cellular technology can no longer meet the huge demand of mobile users for data traffic. Limited spectrum resources and rapidly increasing data traffic have become the main problems restricting communication networks. D2D communication provides an effective solution to this problem. Since D2D communication is near-field direct communication between devices without forwarding by a base station, D2D communication has many advantages. First of all, because D2D communication is short-distance direct communication, D2D users can enjoy high data transmission rate and low transmission delay; secondly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W72/04
CPCH04W72/0453H04W72/53
Inventor 徐玉滨李小帅马琳王孝张文彬刘宁庆
Owner HARBIN INST OF TECH
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