1. Network Infra. Lab. 11 th July, 2006 Sang-Eon Kim * Eun Kyoung Paik Jong Sam Jin The 66th IETF Meeting

2. WiBro Specification Major System Parameters –Duplexing: TDD –Multiple Access: OFDMA –Channel bandwidth: 10 MHz 2300MHz23272331.52358.5236323902400MHz CH1 CH2 CH3 CH1 CH2 CH3 CH1 CH2 CH3 1st Band2nd Band3rd Band Wireless LAN 4.5MHz 10MHz CH1 Radio Access Requirement –Frequency Reuse Factor: 1 –Mobility: ~60Km/h –Service Coverage: ~1km –Spectral Efficiency (sector) Max. DL/UL: 6 / 2 [bps/Hz/cell] Aver. DL/UL: 2 / 1 [bps/Hz/cell] –Handover : ~ 150ms –Throughput (user) Max. DL/UL: 3 / 1 [Mbps] Min. DL/UL: 512 / 128 [Kbps] Frequency Allocation

3. WiBro Architecture IP Network Internet PE MS Mobile Station RAS Remote Access Station ACR Access Control Router HA (IPv6) Home Agent AAA Authentication, Authorization, Accounting ACR DNS Domain Name Server Aggregation Swtich SNMP, FTP A Reference point I Reference Point U Reference point

4. IP over WiBro Convergence SublayerBearerControlManagement IPv4  IPv6 – Bearer  IPv6 – Control  IPv6 – Management  IPv6 – Bearer/Control  IPv6 – Control/Management  IPv6 – all  IEEE 802.16 IEEE 802.16/IETF

5. IPv4/IPv6 Bearer 48 bitsVariableoption Generic MAC HeaderPayloadCRC CS Type Convergence Sublayer 101Packet, IPv6 105Packet, IPv6 over IEEE 802.3/Ethernet 107 Packet, IPv6 over 802.3/IEEE 802.1Q VLAN  Classification of the higher-layer protocol PDU into the appropriate connection  Suppression of payload header information (optional)  Delivery of the resulting CS PDU to the MAC SAP associated with the service flow for transport to the peer MAC SAP  Receipt of the CS PDU from the peer MAC SAP  Rebuilding of any suppressed payload header information (optional) Packet CS Function

6. Protocol Stack at U WiBro IPv4IPv6 802.3802.3/VLAN IEEE 802.16

7. Technical Issues Network Architecture –RRC function in RAS (distributed control) or ACR (centralized control) Broadcast and multicast for control –ARP in IPv4, Neighbor Discovery in IPv6 Bandwidth fluctuation in cell coverage QoS –DiffServ and 5 class of IEEE802.16 (UGS, RT-PS, ERT-PS, NRT-PS, BE) –QoS Control protocol; COPS, Diameter, SNMP, …

8. Technical Issues Performance –Wireless TCP vs Wired TCP; New RTO algorithm require. Mobility –Mobile IPv6 and more… AAA –Diameter, RADIUS, …