By Leijia Wu, Kumbesan Sandrasegaran
This booklet discusses the fundamental notion of universal Radio source administration (CRRM), in particular at the Radio entry applied sciences choice a part of CRRM. It introduces interplay capabilities (information reporting functionality and RRM selection help functionality) and 4 interplay levels (from low to very excessive) of CRRM. 4 attainable CRRM topologies (CRRM server, built-in CRRM, Hierarchical CRRM, and CRRM in consumer terminals) are defined. The publication offers diverse Radio entry applied sciences choice algorithms, together with unmarried criterion and a number of standards established algorithms are awarded and compares them. ultimately, the ebook analyses the benefits and drawbacks of different choice algorithms.
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Additional resources for A Study on Radio Access Technology Selection Algorithms
The fuzzy logic based control component has four fuzzy logic based subsystems considering four user selection criteria separately: reliability, security, battery power, and price. The inputs of the four subsystems are the user preferred price, user preferred reliability, user preferred security, and the importance of battery power for the user respectively, and each subsystem has three outputs: the probabilities of acceptance for the user in WWAN, WMAN, and WLAN respectively. The MCDM component uses the outputs of the fuzzy logic based control component as inputs and works out ranking values for the three RATs by allocating a weighting factor on each criterion.
In , the proposed adaptive algorithm is compared with the “Always WWAN” and “WLAN if coverage” algorithms in terms of call blocking probability. Simulation results in  prove that the performance of Hasib’s algorithm is better than the other two in terms of new call blocking probability because it allocates users according to a number of criteria rather than just allocates users in a predefined order. However, it is more complex and requires more information. A challenge of this algorithm is that it relies on the location prediction information, which may be hard to be obtained in practice.
For example, during busy hours, the IN*VG*Load algorithm can be used while the second algorithm can be used at other times. 4 kbps? 2 Variations of NCCB Algorithm Two variations of the NCCB algorithm were introduced in . One is called NCCBvoice, where the NCCB policy is only applied for voice users while interactive users follow the VG policy. Another is called VG-NCCB, where the low path loss users follow the VG policy and high path loss users are always allocated to GERAN first. Simulation results in  prove that the NCCB algorithm performs better than NCCBvoice and VG-NCCB algorithms in terms of uplink BLER.