TAILIEUCHUNG - Báo cáo hóa học: "Editorial Antonio Ortega"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Editorial Antonio Ortega | EURASIP Journal on Applied Signal Processing 2005 2 113-115 2005 Hindawi Publishing Corporation Editorial Antonio Ortega Department of Electrical Engineering-Systems University of Southern California Los Angeles CA 90036 USA Email ortega@ Lang Tong School of Electrical and Computer Engineering Cornell University Ithaca NY 14853 USA Email ptong@ Haitao Zheng Microsoft Research Asia Sigma Center Beijing 49 Zhichun Road Beijing 100080 China Email htzheng@ Michele Zorzi Dipartimento di Ingegneria dell Informazione Universita di Padova 35131 Padova Italy Email zorzi@ Next-generation wireless communications aim to provide seamless service to mobile users anywhere anytime. One important aspect of wireless communications is the dynamic behavior. The structure of conventional protocols is inflexible requiring layers to communicate in a strict manner. Specifically layers are designed to operate under worstcase conditions rather than adapting to conditions as they change. This leads to inefficient use of both spectrum and energy. Adaptation allows network protocols and applications to observe and respond to channel variations. Central to adaptation is the concept of cross-layer design. In general crosslayer design involves five key layers in the protocol stack . application layer transport layer network layer medium access layer and physical layer . According to the varying network and channel conditions applications can adjust their behavior such as error resilience via forward error correction and data transmission rates. Adaptation can also take place in underlying layers such as TCP and UDP so a single application can transparently operate on top of different networks. Application characteristics such as QoS requirements and packet priority can be used to coordinate lower layers for improved resource efficiency. Finally also important to adaptation is each layer s ability to first estimate current and future network .

TÀI LIỆU LIÊN QUAN
TÀI LIỆU MỚI ĐĂNG
46    179    0    29-03-2024
37    128    0    29-03-2024
10    108    0    29-03-2024
5    118    0    29-03-2024
75    130    0    29-03-2024
1    102    1    29-03-2024
Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.