R3-001326.doc - 3GPP TSG-RAN Working Group 3 Meeting#12...

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3GPP TSG-RAN Working Group 3 Meeting #12 Oahu, Hawaii, 22 – 26 May 2000 TSGR3#13(00)1326 Agenda Item: 27b Source: Motorola Title: IP-based Iub/Iur User Plane Protocols for R'00 Document for: Discussion _________________________________________________________________________________________ 1 Introduction The R99 User Plane requires ATM/AAL2 for transporting user traffic on both the Iur and Iub interfaces. This contribution proposes that for R00 IP transport be introduced as an alternative to carrying user plane traffic directly over the ATM Layer 2. An objective is to be Layer 2 protocol independent, i.e., the standard should optionally allow various Layer 2 protocols in addition to ATM, which indicates that the transport protocols should be Layer 3 oriented. This study shows that certain IP based transport protocol alternatives can perform as well as, or better than ATM/AAL2 based protocols. In deciding which transport alternatives to choose, the following criteria are considered: Layer 2 should offer services of multiple LAN/WAN technologies and be transparent to the application layers above. Transport protocols should be Layer 3 (i.e., IP) oriented. An IP over ATM stack option should be included to enable transport infrastructure reuse in transition from ATM oriented protocols. Overhead per user should be minimized, and hence, efficiency should be maximized. Delay and jitter constraints imposed by interface standards must be demonstrably achieveable. QoS services and parametrics must be defined and originate at Layer 3. Support of Layer 3 QoS must be provided by all acceptable Layer 2 services. Options for transporting over point-to-point links, as well as routed networks should be considered. (If possible, these two schemes should be "compatible".) 2 Protocol Stack Options Here we explore some possible protocol stacks that may satisfy the objectives above. In general it is proposed to transport user plane traffic for both the Iub and Iur using IP/UDP as the layer 3/4 protocols. Different layer 2 protocols may be used in a transparent manner. It is apparent that some type of header compression and multiplexing scheme is required in order for IP/UDP to perform efficiently over Iur/Iub interfaces. Two multiplexing alternatives are presented for use with different layer 2 options. 1
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2.1 PPP Multiplexing Schemes One possible protocol stack is to use standard HDLC/PPP [5], [6] to carry individual user packets with compressed IP/UDP headers [2], [3] (see Figure 3.). This is suitable for point-to- point links such as those for the Iub interface. One drawback of this scheme is that there is a sizeable (7 bytes) overhead for each user. A standards track IETF draft [1] proposes to share some of this overhead by multiplexing several users within a PPP frame. This reduces the per user overhead to 4 bytes (see Figure 4.), plus 5 bytes which are “amortized” over all the users in the frame. This option is not intended for WAN-like routed interfaces such as Iur.
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  • Spring '13
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  • Asynchronous Transfer Mode, Internet Protocol Suite, Point-to-Point Protocol

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