Transmission of streaming data over an EGPRS wireless network

Abstract

Abstract| W e investigate the feasibility o f transmitting MPEG-2 AAC Advanced Audio Coder music over packetswitched bearers of an Enhanced General Packet Radio Services cellular network. Streaming data applications like AAC music di er from conversational voice in that they permit a larger transmission delay and delay jitter than the former. In addition, AAC m usic can tolerate a higher frame error rate than voice by using error concealment techniques at the receiver. This creates the opportunity t o transmit AAC m usic over data-optimized, high-throughput and nominally high-error rate, wireless networks, by using appropriate performance enhancing techniques. In particular, we i n vestigate the performance with the following techniques: i Link-layer retransmissions; ii Dynamic packet assignment; and iii Packet interleaving or shu ing. We nd that all the above techniques are desirable in order to simulateneously achieve a high spectral e ciency and the required quality. While this paper is focused on one application, the conclusions and insights are applicable to most streaming audio and video applications.

Transmission of multiple description and layered video over an EGPRS wireless network

“…In [7], we explored a mechanism to estimate the sustainable channel rate based on measured interference, prior to initiating the video session. Video quality was significantly improved by choosing a suitable transmission rate for a user based on observed channel characteristics.…”

“…In [7] we examined system issues associated with transporting one-layer video over EGPRS. We found that linklayer adaptation, error control, and retransmissions are important factors in providing good video quality to most users.…”

“…We found that linklayer adaptation, error control, and retransmissions are important factors in providing good video quality to most users. In this paper, we use the parameters that gave the best results in [7], namely, 3 retransmissions per packet with a 3-second allowable playout delay. Any video data that has not been transported by the time it should be received at the decoder is discarded at the transmitter.…”

“…In [7] we found that, using a single EGPRS channel, a 16 kbps video can be reliably transmitted to approximately 85% of users by using the following techniques: link layer adaptation, error control, and retransmissions. On the other hand, 32 kbps video can be reliably received by around 40% of the users in the same system; the remaining users see unacceptable video quality.…”

Cycle-Based Rate Control for One-Way and Interactive Video Communications Over Wireless Channels

“…Such solutions exploit the scalability offered by recently standardized compression formats. Several of these rate-control solutions have been targeted towards erroneous channels (e.g., [19], [7], [20], [14], [3], [2]; see also [26], [27], [28] and the references therein). The authors in [13] formulated an optimization problem that considers as design parameters the end-to-end delay, the policing constraints, and the encoder and decoder buffer sizes.…”