Method for selecting network in heterogeneous network

Abstract

The embodiment of the invention provides a method for selecting a network in a heterogeneous network, which comprises the following steps that an access network at each decision time is determined according to benefits, state transition probabilities and state probability vectors of each network in various states; and according to the access network at each decision time, the heterogeneous network obtains the largest system benefit, wherein the decision time is the time for sending an access request or a leave request to the network by a user, and the state of the network is the number of various users probably to be accessed to each network. Because the correlativity of state changes of each network in a time quantum is considered, the access network at each decision time is determined according to the benefits, the state transition probabilities and the state probability vectors of each network in various states at each decision time in a plurality of continuous decision times so that the heterogeneous network obtains the largest system benefits during the decision period comprising the plurality of the decision times.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a network selection method in a heterogeneous network. Background technique [0002] At present, with the rapid development of wireless network technology, many new wireless heterogeneous networks have emerged, which integrate multiple wireless access technologies, and various wireless access technologies complement each other to provide multimedia users with optimal access anytime and anywhere. Such as figure 1 As shown, the wireless access technology of wireless heterogeneous network, such as wireless wide area network represented by cellular network, wireless metropolitan area network represented by WiMAX (World Interoperability for Microwave Access, global interoperability for microwave access) network, and IEEE 802.11 (a wireless local area network standard formulated by IEEE) network as the representative wireless local area network and so on. [0003] The followin...

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Problems solved by technology

[0006] The network selection methods in the various heterogeneous networks mentioned above, because the state of each network may change within a time period, and the state change of each network at a certain moment is related to the state of each network at the previous moment, so if Every time a user requests to access the network, the optimal network is selected as the user's access network, without considering the correlation of the state changes of each network within a time period, which may cause the selected optimal network to fail to be realized as Users provide the best results, poor system capabilities for heterogeneous networks

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