ABSTRACT
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In general, one of the major challenges for wireless communication is the capacity of wireless channels, which is especially limited when a small delay bound is imposed, for example, for voice service. A Voice over Internet Protocol (VoIP) packet, on the other hand, has large overheads compared with circuit-switched voice. VoIP signaling packets are also typically large, which in turn could cause a long signaling delay when transmitted over wireless networks. In order to use the wireless channel capacity effi ciently and make VoIP services economically feasible, it is necessary to apply compression techniques to reduce the overheads in the VoIP bearer and signaling packets. In this chapter, we discuss the following compression techniques for VoIP: robust header compression (RoHC) for bearer paths and signaling compression (SigComp) for signaling paths. RoHC and SigComp are the most favored compression techniques for VoIP in wireless communication today.
