1. Wireless Technology Laboratory, Huawei Technologies Co., Ltd., Shanghai, China
2. Wireless Technology Laboratory, 2012 Laboratory, Huawei Technologies Co., Ltd., Chengdu, China
3. iTEAM Research Institute of the Universitat Politecnica de Valencia, Valencia, Spain
4. Wireless Technology Laboratory, Huawei Technologies Co., Ltd., Chengdu, China
5. Huawei Technologies Research and Development Ltd., Cambridge, U.K.
6. Huawei Technologies Co., Ltd., Shanghai, China
7. Huawei Technologies Canada Co., Ltd., Ottawa, Canada