Delay and Throughput Performance of Uncompressed Video Streaming Service in mmWave WPAN Seokho Kim, Xizhi An, Saurabh N. Mehta, Sangkyoon Nam, and KyungSub Kwak Inha Graduate School of Information Technology & Telecommunications Inha Univ., 253 Yonghyun-dong, Nam-gu, Incheon, 402-751, Republic of Korea {sylvstar, anxizhi, smehta, sknam}@inhaian.net, kskwak@inha.ac.kr Abstract - Existing WPAN solutions (IEEE 802.11 a/b/g, UWB) only have limited bandwidth and cannot support uncompressed video transmission. Instead, 60GHz millimeter-wave(mmWave) band is attracting much interest because it can provide huge bandwidth and achieve very high data rate(over 3Gbps). In this paper, we present the comparison of different superframe sizes in terms of delay and throughput for uncompressed video streaming in mmWave WPANs. We use the Constant Bit Rate (CBR) model to emulate the 1080p (30f 20b) video streaming. For simplification, we assume that an error-free PHY wireless channel is adopted. Simulation results show that the superframe size of 1/60s can result in better performance than that of 2ms for the uncompressed video service in mmWave WPAN. It is necessary to increase superframe size and use aggregation method, in order to achieve high throughput. 1. Introduction The application of uncompressed video transmission is delay sensitive and requires constant bandwidth allocation. Allocating Bandwidth below the required data rate causes service failure. Existing WPAN solutions (IEEE 802.11 a/b/g, UWB) only have limited bandwidth and cannot support uncompressed video transmission.[1] Instead, 60GHz millimeter-wave(mmWave) band is attracting much interest because it can provide huge bandwidth and achieve very high data rate(over 3Gbps). The current standard contributions of IEEE 802.15.3c are mainly concerned with the PHY technique.[3] In this paper, we present the comparison of different superframe sizes in terms of delay and throughput for uncompressed video streaming in mmWave WPANs. The significance of beacon period in the superframe is also analyzed. We use the Constant Bit Rate (CBR) model to emulate the 1080p (30f 20b) video streaming. The performance of IEEE 802.15.3c MAC is simulated in the ns-2 platform. For simplification, we assume that an error-free PHY wireless channel is adopted, and there is no traffic assigned in the CAP, and only one video stream is transmitted from one DEV to another. The rest of the paper is organized as follows. In Section 2, we describe overview of IEEE 802.15.3c MAC. In Section 3, we provide delay and throughput performance of uncompressed video streaming service in mmWave WPAN. We conclude in Section 4. 2. IEEE 802.15.3c MAC IEEE 802.15.3c MAC protocols are designed to support high data rate mmWave (millimeter wave) communications for WPANs. It consists with additional functions based on 802.15.3b MAC protocols. The differences between 802.15.3c and 802.15.3b are as follows.[4] With high data rate mmWave PHY, IEEE 802.15.3c defines new transmission mode (common mode, LRT, MRT, and HRT) and device antenna types (omni and directional). Beacon and CAP should communicate with DEVs on common mode only using omni antenna. CTAP can support all of the transmission mode and device antenna types. 802.15.3c piconet superframe structure is modified to support them. The optional extended beacons are newly defined which are allow DEVs with different transmission mode and DEVs locating in different directional antenna coverage to join the piconet. They occur after the beacon but before the CAP. Figure 1 shows the IEEE 802.15.3c Superframe structure. BP CAP CTAP Superframe overhead 8.157µs GT GT Preamble & PLCP Data payload SIFS Time for data ... 2.5µs overhead Preamble & PLCP Data payload SIFS Time for data 2.5µs 8.157µs overhead 8.157µs Preamble & PLCP Data payload SIFS Time for data 2.5µs 0.02µs 0.02µs Figure 1: IEEE 802.15.3c Superframe structure IEEE 802.15.3c contains 19 operation procedures which are 4 new operations procedures and 15 operations procedures from 802.15.3b. The 4 new operation procedures are channel probing, beam forming (option), UEP (option) and DEV-DEV directional communication (option). IEEE 802.15.3c frame format is also changed as follows. It modifies not only length of preamble, PHY header, and payload but also beacon frame format. Especially, subheader is newly defined to support frame aggregation for High throughput. And 802.15.3c MAC define additional frame format for new operation procedures such as channel probing, beam forming, and UEP.