Coding-Based Data Broadcasting for Time-Critical Applications With Rate Adaptation

• Published in: IEEE transactions on vehicular technology Vol. 63; no. 5; pp. 2429 - 2442
• Main Authors: Wang, Xiumin, Yuen, Chau, Xu, Yinlong
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.06.2014; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Algorithm design and analysis; Algorithms; Applied sciences; Coding; Coding, codes; Delay; Delays; Design engineering; Electrical engineering. Electrical power engineering; Electrical power engineering; Encoding; Exact sciences and technology; Information, signal and communications theory; Mathematical models; Network coding; Operation, maintenance, reliability; Operation. Load control. Reliability; Packets (communication); Power networks and lines; Quality of service architectures; Receivers; Signal and communications theory; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Transmission and modulation (techniques and equipments); Wireless communication; Wireless networks; Network coding; wireless data broadcasting; time-critical applications; rate adaptation; Wireless telecommunication; Data broadcast; Networked system; Traffic control; Delay time; Delayed time; Packet switching; Logarithmic function; Flow rate regulation; Teletraffic; Algorithm; Transmission time; Polynomial time; Algorithm performance; Traffic management; Optimal solution; NP hard problem; Optimal code; Wireless network; System simulation; Metric; Transmission rate; Service quality
• ISSN: 0018-9545; 1939-9359
• DOI: 10.1109/TVT.2013.2290701

In this paper, we dynamically select the transmission rate and design wireless network coding to improve the quality of services, such as delay for time-critical applications. In a network coded system, with a low transmission rate and, hence, a longer transmission range, more packets may be encoded, which increases the coding opportunity. However, a low transmission rate may incur extra transmission delay, which is intolerable for time-critical applications. We design a novel joint rate selection and wireless network coding (RSNC) scheme with a delay constraint to maximize the total benefit (where we can define the benefit based on the priority or importance of a packet for example) of the packets that are successfully received at the destinations without missing their deadlines. We prove that the proposed problem is NP-hard and propose a novel graph model to mathematically formulate the problem. For the general case, we propose a transmission metric and design an efficient algorithm to determine the transmission rate and coding strategy for each transmission. For a special case when all delay constraints are the same, we study pairwise coding and present a polynomial-time pairwise coding algorithm that achieves an approximation ratio of 1 - (1/e) to the optimal pairwise coding solution, where e is the base of the natural logarithm. Finally, simulation results demonstrate the superiority of the proposed RSNC scheme.