| 摘要 |
The likelihood of dropping a call while a User Equipment (112) is moving quickly from a macrcell (C) into a small cell (B) and then out again because there is insufficient time to set up measurements in the User Equipment, is mitigated by forcing the User Equipment to enter compressed mode as soon as it hands over to the small cell (B). By immediately forcing the User Equipment to enter compressed mode rather than waiting until it reports that the serving cell is getting weak, it stands a better chance of finding inter-frequency (ie. non-co-channel) and inter-RAT (ie. different radio access technologies) neighbouring cells ready to hand out to. The UE is instructed to enter compressed mode if the macrocell from which it is handed over is known to be a problem cell. A problem cell is defined as a cell for which a UE, after being handed over therefrom, into the small cell, requires handing over to another cell before expiry of a predetermined time period. |
