Evolution of Rule-Based Approach for Defining dTib and dRib Values in Nokia RAN4
Proposal in RAN4#99 explores a rule-based approach for defining dTib and dRib values, aiming to complement table compression efforts. The study discusses how certain band combinations follow specific rules and handles cases individually. RAN4 plans to further discuss defining rule sets for deriving dTib and dRib values, analyzing current values, and identifying combination types needing specific treatment. There are considerations on how to apply derived rules effectively while managing complexity in existing tables.
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WF on rule based approach for delta TIB and RIB Nokia
Background 1/2 In RAN4#99 there was a contribution [1] proposing a discussion on rule set based approach for defining dTib and dRib values. Parallel to this RAN4 has also discussed on ways to compress dTib and dRib tables. Proposal on rule-based approach is not to replace table compression effort but to complement it. [1] R4-2108915 New way for defining dTib and dRib
Background 2/2 In [1] it was studies on how many current band combinations follow rule-set outlined below H-L dTib=0.3 and dRib=0 L-L and H-H dTib=0.5 and dRib=0 L-L-L and H-H-H maybe needs case by case study Carriers in bands with a harmonic falling onto one of the DLs: default dTIB = 0.6 dB 42,77,78 gets dTib=0.8 and dRib=0.5 n79 dTib = 0 and dRib=0 unless is combined with 3.5 GHz bands then dTib=0.8 and dRib=0.5 dRib = dTib-0.5 dB Combinations with notes are handled case by case Low bands in above are below 1GHz and high bands above 1 GHz but bands around 3.5 GHz and above are handled separately. Some statistical analysis were presented
Way forward - Rules RAN4 continues discussion in next meeting on if it is possible to define rule-set from which dTib and dRib values are derived. Following topics at least should be discussed What kind of rules could be considered Analysis on how current dTib/dRib values correlate with rules Which are the combination types that need case by case treatment
Way forward How to apply Rules In moderator summary on 151 there were also some discussion on how to apply rules if such are derived, see below. Further discussion on this is also welcomed. Just have rules and delete tables Not realistic Have rules based approach and apply that all new combos but keep exiting tables Not realistic Have rules based approach and apply that to majority combos but complex combinations are added into tables, like the ones with notes or 3 low bands etc Possible Companies can use rules to derive relaxations but values are always captured into tables possible
