/specs/tsgc.cfm>. April 2007. [23] 3GPP2 CS0087-0 v1.0, E-UTRAN - cdma2000 Connectivity and Interworking: Air Interface Specifica- tion.<http://www.3gpp2.org/Public_html/specs/tsgc.cfm>, May 2009. [24] 3GPP2 CS0086-0 v1.0, WiMAX-HRPD Interworking: Air Interface Specification. <http://www.3gpp2. org/Public_html/specs/tsgc.cfm>, May 2009. 3GPP TR 36.938, Evolved Universal Terrestrial Radio Access Network (E- UTRAN); Improved Network Controlled Mobility Between E-UTRAN and 3GPP2/Mobile WiMAXR Technologies. <http://www.3gpp. org/ftp/Specs/html-info/36-series.htm>, March 2008. [26] 3GPP TR 36.912, Feasibility Study for Further Advancements for E-UTRA (LTE-Advanced). <http:// www.3gpp.org/ftp/Specs/html-info/36-series.htm>, March 2010. R.Y. Kim, S. Mohanty, "Advanced Power Management Techniques in Next-Generation Wireless Networks," IEEE Communications Magazine, Vol. 48, Issue 5, May 2010. This page intentionally left blank CHAPTER The IEEE 802.16m Convergence Sub-Layer INTRODUCTION This chapter provides a detailed description of the functional components and protocols associated with the IEEE 802.16m service-specific Convergence Sub-layer (CS). The convergence sub-layer, as shown in Figure 5-1, is located on top of the IEEE 802.16 MAC sub-layer and interfaces the MAC sub- layer with the network layer protocols and further performs the following functions: Accepting Protocol Data Units (PDUs) from the network layer; Performing classification of higher layer PDUs; Processing the higher layer PDUs based on the classification (i.e., payload header compression); Delivering CS PDUs to the MAC Service Access Point (SAP); Receiving CS PDUs from the peer entity. The convergence sub-layer is part of Open System Interconnection Data-Link Layer (alternatively known as Layer 2) protocol class and is interfaced with network layer and MAC sub-layer through CS SAP and MAC SAP, respectively. The convergence sub-layers of the IEEE 802.16m and IEEE 802.16-2009 standard have very similar behavior; the only differences are in the assignme