[单选题]（ ）was frozen in December 2008 and this has been the basis for the first wave ofLTE equipment.LTE specifications are very stable，with and added benefit of enhancements having been introduced in all subsequent 3GPP Releases.

正确答案 ：B

Release 8

[多选题]电信网的软件包括网的（）以及技术体制、技术标准等。

正确答案 ：ABCD

网路结构

网内信令

协议

接口

解析：ABCD

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