Evaluation and optimisation of session setup delay for streaming services over 3G networks with quality of service support

Abstract

Session setup delay in Packet Switched Streaming (PSS) services over Third Generation (3G) wireless networks is impacted by Real‐Time Streaming Protocol (RTSP) and Session Description Protocol (SDP) signalling exchange and negotiation, as well as media buffering at the terminal before playback. The paper discusses PSS session setup delay over 3G, and proposes two RTSP and SDP protocol extensions to reduce this delay, namely: RTSP Early Setup and usage of SDP Templates. The rationale behind this proposal is presented, particularly when a Secondary Packed Data Protocol Context (PDP‐Context) is used to support media delivery with Quality of Service (QoS) support. The RTSP Early Setup mechanism facilitates pipelining of RTSP messages and early trigger of Secondary PDP‐Context setup. The SDP Template mechanism proposes using a generic procedure to avoid transmission of frequently used SDP fields. Copyright © 2006 John Wiley & Sons, Ltd.

Template-Based Signaling Compression for Push-To-Talk over Cellular (PoC)

“…Viamonte et al in [13] introduce the concept of Session Description Protocol (SDP) template for reducing the session setup delay for streaming services using the Real-Time Streaming Protocol (RTSP). Here, the streaming server builds a template for the SDP part of the RTSP packet.…”

“…The approach proposed in [13] can be seen as a specific case of our TBC, although with some important differences.…”

“…In [13] the way the template is built and used is specific to the characteristics of streaming sessions and it addresses only SDP content for RTSP messages. Many parameters that we consider as variable such as codecs and port numbers, are considered as constant and therefore part of the SDP template.…”

Optimizing IETF multimedia signaling protocols and architectures in 3GPP networks : an evolutionary approach

“…Such guiding principles can be stated as "Do more with less" and "Keep it simple". As the reader will see, our approach is generally to "achieve more without modifying the core protocol", with [16] [17] being two good examples of this, or "maximize gains while applying minimal protocol changes without breaking backwards-/forward-compatibility", with [18] [19] being good example of the later.…”

“…Further, 3GPP has made intense effort in providing RTP usage guidelines to implementers, in areas such as packet sizes, encoding and transmission strategies… This work has been progressively compiled into each release version of [41]. Release-7 specs are similar to the optimizations proposed by the author in [18].…”