ABSTRACT
CONTENTS 4.1 Challenges for Radio Resource Management in UMA Networks .......................... 52 4.2 Radio Resource Management Tuning Parameters................................................ 54
4.2.1 Transmit Power Selection ...................................................................... 55 4.2.2 Carrier Sense Threshold Selection .......................................................... 57 4.2.3 Transmit Rate Selection ........................................................................ 58 4.2.4 Station Assignment .............................................................................. 60 4.2.5 Channel Selection ................................................................................ 61 4.2.6 Access Point Placement ......................................................................... 64
4.3 Radio Resource Management Architectures ....................................................... 65 4.3.1 Taxonomy ........................................................................................... 65
4.3.1.1 Network-Centric versus Client-Centric .................................... 65 4.3.1.2 Centralized versus Decentralized ............................................. 65 4.3.1.3 Coordinated versus Uncoordinated.......................................... 66
4.3.2 Examples of Systems............................................................................. 66 4.3.2.1 Centralized Architectures Using the CAPWAP Protocol............. 66 4.3.2.2 Virtualized Wireless Access Networks ...................................... 68
4.4 Radio Resource Management Support in Standards ............................................ 68 4.4.1 IEEE 802.11h: SpectrumManagement .................................................. 68 4.4.2 IEEE 802.11k: Radio Resource Measurements ........................................ 69
4.4.3 IEEE 802.11v: Network Management .................................................... 70 4.5 Conclusions and Open Research Issues.............................................................. 70 References .............................................................................................................. 71
Unlicensed mobile access (UMA) networks increasingly depend on radio resource management techniques to satisfy the rising quality of service (QoS) expectations of their users. The task of radio resource management is to monitor a wireless network’s performance and control its allocation of radio resources to meet a predefined performance goal, such as maximizing the minimum fair share of transmission opportunities for each node in the network. In this respect, it differs from the planning of a wireless network, which only covers the parameters that have to be chosen before a network’s deployment and remain static during its operation.
