Frequency quality criteria for inter-frequency handover in a TD-CDMA communication system
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[0023] According to the invention, the IFHO algorithm for TD-SCDMA is modified so as to include a frequency criteria or metric for two different causes of IFHO: one for coverage-caused link deterioration (i.e. for the case that a UE moves outside of the coverage area of a SAP) and the other for over-capacity. For coverage-caused IFHO, the IFHO metric can be the same as in the prior art, namely:
M(IFHO-coverage)=PRSC, (1)
where PRSC is P-CCPCH RSCP (for a particular cell i, not made express in the above, and for a particular frequency j, also not made express), i.e. the received signal code power for P-CCPCH (for a cell i). For over-capacity, the IFHO metric can be:
M(IFHO-capacity)=PRSC / (IRSS−PRSC), (2)
(again for a particular cell i, not made express, and for a particular frequency j, also not made express) where IRSS=UTRA Carrier RSSI (Received Signal Strength Indicator), which is used here to indicate the wideband power of slot 0. Other metrics for the IFHO capacity metric ...
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