A service-preference-and-network-condition-based vertical handoff method (SNVHO)

A technology of service preferences, network conditions, applied in the direction of electrical components, access restrictions, wireless communication, etc.

Active Publication Date: 2014-03-26
江苏福康通智能科技有限公司
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Problems solved by technology

[0010] Purpose of the invention: In order to solve the performance problems of t

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  • A service-preference-and-network-condition-based vertical handoff method (SNVHO)
  • A service-preference-and-network-condition-based vertical handoff method (SNVHO)
  • A service-preference-and-network-condition-based vertical handoff method (SNVHO)

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Embodiment Construction

[0123] The whole process is as Figure 5 As shown, the vertical switching method based on service preference and network conditions takes into account the requirements of different service types and the inherent attributes of the network (bandwidth, cost, delay, etc.), the key is to calculate two types of weights: weights of inherent network attributes and weights based on service preference , calculated as follows:

[0124] Step 1: Calculating the weight of inherent network attributes. The network attributes include SINR (signal-to-noise ratio), bandwidth utilization, transmission delay, and packet loss rate. Calculate the combined weight vector W N .

[0125] Step 2, calculate service preference weight W S ;

[0126] Step 3, combined with the service preference weight vector W S and the network conditional weight vector W N , get the combined weight vector W f ,

[0127] W f = W S ...

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Abstract

The invention discloses a service-preference-and-network-condition- based vertical handoff method (SNVHO). The handoff method employs a new algorithm for computing weights. Related weights are divided into two kinds: one kind is subjective weights targeting at service preferences and the other kind objective weights determined by network characteristics. An analytic hierarchy process (AHP) is employed, and a decision matrix obtained through the utilization of relative importance is utilized in order to compute the weight of each handoff decision factor; and finally, final decision is carried out through the utilization of a accumulative sum of a product of each attribute multiplied by the corresponding weight. According to the method of the invention, targeting at different service calculation weights, the weights are dynamically changing instead of being fixed values, so that defects of setting the fixed values are overcome. A simulation result show that the service-preference-and-network-condition-based vertical handoff method (SNVHO) is greatly improved in terms performance parameters such as the vertical handoff times, the system throughput, the call drop rate and user costs.

Description

Technical field: [0001] The invention belongs to the field of communication, in particular to the field of heterogeneous network switching Background technique [0002] Handover decisions in next-generation heterogeneous wireless networks are mainly multi-attribute decision-making problems. In the process of vertical switching, the selection of the candidate network is judged by calculating the effect function or cost function of the network through the decision attribute and the corresponding weight value [LING Yu-tao, YI Ben-shun, ZHU Qiu-ping. Vertical handoff decision strategy in wireless overlay networks[C]. / / Proceedings of the5th International Conference on Wireless Communications, Networking and Mobile Computing.2009:1-3]. For example, a simple weighting algorithm such as formula (1): [0003] A SAW * = arg max i ∈ M ...

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Application Information

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IPC IPC(8): H04W36/34H04W36/14H04W48/06
Inventor 宋文广陈远龙赵海涛李大鹏
Owner 江苏福康通智能科技有限公司
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