Survey and Challenges of QoE Management Issues in Wireless Networks

Table 4

An overview of QoE optimization approaches in wireless environments.

QoE optimization approach	QoE optimization point	QoE optimization strategy	Wireless technologies considered	Deployment challenges
Skorin-Kapov and Matijašević [100]	SIP application server in IMS domain	(i) Mechanisms for service adaptation; (ii) Mechanisms for optimal network resource allocation	3GPP access	(i) Computational complexity; (ii) Users subjectivity; (iii) Signaling overhead; (iv) Scalability
Ivešić et al. [101]	SIP Application server in IMS domain and policy engine in core network (e.g., PCRF)	Mechanisms for domain-wide optimal network resource allocation	3GPP access	(i) Computational complexity; (ii) Scalability; (iii) Users subjectivity
Sterle et al. [102]	SIP application server in IMS domain	Mechanisms for service optimization	WiMAX and UMTS	(i) Computational complexity; (ii) Users subjectivity; (iii) Scalability; (iv) Extendibility
Thakolsri et al. [103]	Core network; (cross-layer based optimization)	(i) Mechanisms for optimal radio resource allocation; (ii) Mechanisms for rate adaptation	UMTS (HSDPA)	(i) Users subjectivity; (ii) Extendibility
Staehle et al. [97]	Core network; (cross-layer based optimization)	(i) Mechanisms for optimal radio resource allocation; (ii) Mechanisms for service optimization	WLAN	(i) Computational complexity; (ii) Users subjectivity; (iii) Scalability
Shehada et al. [112]	Core network; (cross-layer based optimization)	Mechanisms for optimal network resource allocation	LTE	(i) Extendibility; (ii) Users subjectivity
Amram et al. [113]	Core network; (cross-layer based optimization)	(i) Mechanisms for optimal network resource allocation; (ii) Mechanisms for optimal handover decision	LTE and WLAN	(i) Extendibility; (ii) Cost limitations; (iii) Optimal CDN node selection; (iv) Users subjectivity; (v) Scalability; (vi) Modification of scheduling algorithm
Aristomenopoulos et al. [109]	Access network; (cross-layer based optimization)	(i) Mechanisms for optimal radio resource allocation; (ii) Mechanisms for integration of user's subjectivity	CDMA	(i) User’s fairness; (ii) Extendibility; (iii) Scalability
Wamser et al. [110]	Access network; (eNodeB)	Mechanisms for service optimization (prioritized traffic scheduling)	LTE	(i) User’s fairness; (ii) Signaling overhead; (iii) Modification of scheduling algorithm
Piamrat et al. [111]	Access network; (user- and network-data collection)	Mechanisms for optimized access network selection	WLAN	(i) Computational complexity; (ii) Importing intelligence into base stations; (iii) Possible signaling overhead; (iv) Extendibility; (v) User’s fairness
Khan et al. [114]	Sender side; (preencoding stage over access network)	(i) Mechanisms for service optimization; (ii) Mechanisms for rate adaptation	UMTS	(i) Extendibility; (ii) Users subjectivity; (iii) Modification of SBR
El Essaili et al. [107]	Distributed on the end user terminal and access network (base station)	(i) Mechanisms for optimal radio resource allocation; (ii) Mechanisms for service optimization	LTE	(i) Signaling overhead; (ii) Computational complexity; (iii) User's privacy
Csernai and Gulyas [115]	End user mobile device	Mechanisms for optimized battery consumption	WLAN	(i) Extendibility; (ii) Cost requirements; (iii) Modification of scheduling algorithm
Latré et al. [104]	Access network	(i) Mechanism for monitoring the network and building knowledge about it; (ii) Mechanisms for analyzing the knowledge and determining QoE actions and enforcing them; (iii) Mechanisms for reducing packet loss and switching to different video bit rate to obtain better quality	Not explicitly stated	(i) Scalability; (ii) Users subjectivity; (iii) Computational complexity
Hassan et al. [106]	Access network	(i) Mechanisms for optimized resource allocation and provider revenue	WLAN (applicable to others)	(i) User’s fairness; (ii) Scalability; (iii) Speech processing

CDMA: Code Division Multiple Access, GPRS: General Packet Radio Service, HSDPA: High-Speed Downlink Packet Access, IMS: IP Multimedia Subsystem, LTE: Long-Term Evolution, QoE: Quality of Experience, RACS: Resource and Admission Control System, SIP: Session Initiation Protocol, UMTS: Universal Mobile Telecommunications System, WiMAX: Worldwide Interoperability for Microwave Access, WLAN: Wireless Access Network.