JVM fuzzing techniques serve as a cornerstone for guaranteeing the quality of implementations. In typical fuzzing workflows, initial seeds are crucial as they form the basis of the process. Literature in traditional program fuzzing has confirmed that effectiveness is largely impacted by redundancy among initial seeds, thereby proposing a series of seed selection methods. JVM fuzzing, compared to traditional ones, presents unique characteristics, including large-scale and intricate code, and programs with both syntactic and semantic features. However, it remains unclear whether the existing initial seed selection methods are suitable for JVM fuzzing and whether utilizing program features can enhance effectiveness. To address this, we devise a total of 10 initial seed selection methods, comprising coverage-based, prefuzz-based, and program-feature-based methods. We then conduct an empirical study on three JVM implementations to extensively evaluate the performance of the initial seed selection methods within two state-of-the-art fuzzing techniques (JavaTailor and VECT). Specifically, we examine performance from three aspects: (i) effectiveness and efficiency using widely studied initial seeds, (ii) effectiveness using the programs in the wild, and (iii) the ability to detect new bugs. Evaluation results first show that the program-feature-based method that utilizes the control flow graph not only has a significantly lower time overhead (i.e., 30s), but also outperforms other methods, achieving 142% to 269% improvement compared to the full set of initial seeds. Second, results reveal that the initial seed selection greatly improves the quality of wild programs and exhibits complementary effectiveness by detecting new behaviors. Third, results demonstrate that given the same testing period, initial seed selection improves the JVM fuzzing techniques by detecting more unknown bugs. Particularly, 21 out of the 25 detected bugs have been confirmed or fixed by developers. This work takes the first look at initial seed selection in JVM fuzzing, confirming its importance in fuzzing effectiveness and efficiency.

An IP transport scheme for third generation radio access networks (3G RAN) based on multiprotocol label switching (MPLS) technology is proposed. The basic idea is to establish and manage label switched paths for interconnecting base stations and radio network controllers. This scheme incorporates constraint-based routing and Diffserv to provide transport bears that can support bandwidth provisioning and a variety of QoS requirements in the RAN.

In this paper we developed a framework for resource allocation in multi-class traffic CDMA system using adaptive power control and antenna array multiuser receiver. We devised a new scheme in which both transmit power and receiver filter adapt to the time-varying channel state. An antenna array multiuser receiver that jointly processes received signal vectors from multiple antennas and maximizes the signal-to-interference ratio for each user is proposed. It is combined with adaptive power control based on target SIR for each user. Our scheme can support multi-class traffic with different SIR requirements and guarantee their quality of service in multipath fading environment. A theoretical bound is derived to characterize capacity of CDMA system using adaptive power control and antenna array multiuser receiver in multipath fading environment. Simulations show that actual system capacity in multipath finding environment is close to the theoretical bound at large power constraint. Capacity at various power constraints can be characterized by a notion of bandwidth utility. It is also demonstrated that the antenna array multiuser receiver is quite effective in increasing capacity of users with higher SIR requirement and lower power constraint.

In this paper, we develop a framework for quality of service (QoS) differentiation on the CDMA air interface. Unlike many QoS schemes for the CDMA air interface which focus on satisfying the needs of specific applications such as voice and packet data, our framework is based on the paradigm of service classes. Each class is defined by a group behavior, which is implemented using power control and spreading control. Using this framework the 3G operators can define their own set of service classes, choose the preferred way of implementing the group behavior, and offer a class-based pricing scheme. Our work provides a flexible and practical QoS framework that can be used to support a variety of 3G services.

The paper addresses the following issues related to the performance and design of the ATM/AAL2 transport in UTRAN (UMTS terrestrial radio access network): 1) it proposes an alternative AAL2 implementation method that has advantages over the widely-used method; 2) it studies the effect of the stringent delay requirement on the bandwidth requirement of the ATM/AAL2 transport; 3) it proposes the use of common part sublayer (CPS) packet shaping to deal with the burstiness of CBR-based dedicated channel (DCH) traffic caused by the periodic nature of the MAC layer of the UMTS radio interface; 4) it evaluates statistical multiplexing gain from the ATM/AAL2 transport as compared with TDM transport.

In this paper we study resource allocation and capacity of CDMA system using multiuser receiver to support multiple classes of traffic with different data rates and bit error rate requirements. We developed a new resource allocation scheme using adaptive power control and multirate multiuser receiver to guarantee users' quality of service requirements in multipath fading environment. A multiuser receiver that maximizes the signal-to-interference ratio (SIR) for each symbol is proposed for multirate CDMA system. It is combined with adaptive power control based on target SIR to provide different quality of service for multiple-data-rate traffic. A theoretical bound is derived to characterize capacity of multi-class traffic CDMA system using the multiuser receiver. Simulations show that actual system capacity in multipath fading environment is close to the theoretical bound at large power constraint. It is also demonstrated that the multiuser receiver is quite effective in increasing capacity of users with higher data rate and lower target bit error rate.