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Background traffic refers to the autonomous exchange of user plane data packets between the UE and the network, generally in the absence of a specific user interaction with the device. The packets often arise due to open applications (or processes that remain resident in the device memory) which require communication on a regular or intermittent basis with peer entities within the network.
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原文地址：http://www.cnblogs.com/zflibra/p/4232255.html
