Table 1 Definition of symbols used in overhead formulas
From: A signaling architecture for multimedia MBS over WiMAX
Symbol | Definition | Value |
|---|---|---|
MAXSTS | Maximum number of service transactions per second supported by an MBSC-SS instance | 210 (TCP) 70 (UDP) |
FD | Average multicast flow duration, expressed in seconds | 5400 |
IGMPT1 | IGMP timer value, in seconds, for queries refreshing membership to multicast groups transmitting data flows | 125 |
IGMPT2 | IGMP timer value, expressed in seconds, for queries refreshing membership to multicast groups transmitting announcement data | 1250 |
R t | SIP Registration expiration value, expressed in seconds | 3600 |
NSTF | Number of service transactions per user needed to maintain the membership to a multicast data flow of duration FD | - |
N p | Number of available subscription packages (each one with likely more than one channel) | 20 |
N a | Maximum number of users receiving a multicast data flow supported by a MBSC-SS instance | - |
N BS | Number of users served by a BS (or BS sector) on a single WiMAX channel | 200 |
R OH | Overhead per user evaluated at the IP layer associated to a SIP registration | - |
A OH | Overhead per user evaluated at the IP layer for maintaining the membership to Np multicast announcement groups (one for each subscribed package of TV channels) | - |
S OH | Overhead per user evaluated at the IP layer for maintaining the membership to a multicast data flow | - |
C TCP | TCP connection setup/teardown overhead, expressed in bytes | 268 (TCP) 0 (UDP) |