在3g网络环境下降低latency有哪些方法

The latency of 2.5G/3G links is high mostly due to the extensive
processing required at the physical layer of those networks, e.g.,
for FEC and interleaving, and due to transmission delays in the radio
access network [58] (including link-level retransmissions). A
typical RTT varies between a few hundred milliseconds and one second.
The associated radio channels suffer from difficult propagation
environments. Hence, powerful but complex physical layer techniques
need to be applied to provide high capacity in a wide coverage area
in a resource efficient way. Hopefully, rapid improvements in all
areas of wireless networks ranging from radio layer techniques over
signal processing to system architecture will ultimately also lead to
reduced delays in 3G wireless systems.

不过感觉物理层造成的延时很小啊，跟上层的处理延时相比可以忽略嘛。