rs effectively every SACCH period (480 ms) since it can take full advantage of measuring during the idle time between reception and transmission on the Radio Network Optimisation Measurement Measured Full Time Measured only during Idle Bursts Measurement Figure 2.84 Cell reselection measurement cycle assigned timeslot. It can also measure during the idle bursts in the TCH 26 multiframe of its assigned timeslots. The measured neighbours are reported to the network on the SACCH SO the network can make an HO decision. In packet switch (PSW) 'calls', the mobile evaluates neighbours in idle mode every 5 seconds and makes its own determination of when to make a cell change. During each measurement cycle, the mobile is significantly more limited in its available time to take neighbour measurements due to the higher duty cycle of its own downlink and uplink transmission times. In fact, the example above is a 3 + 1 (multislot class 4 or 6) device leaving only about one TSL burst period to spend full time evaluating candidates. Considering multislot class 10 (4+2) and 12 (4+4) devices, the primary reason they are limited to five simultaneous uplink and downlink timeslots is due to the single transceiver design limitation requiring at least one full timeslot dedicated to perform acceptable neighbour measurements during the 5 second idle mode cycle. This illustrates the importance of an effective measurement algorithm within the phone to evaluate accurately and rapidly candidate cells in limited idle bursts and transmit/receive windows while balancing battery saving. The consequences of a slow or inaccurate measurement algorithm are clearly apparent and have been witnessed by the author. The symptoms can be as severe as application timeouts (loss of data RLC flow control or window stalling caused by a low signal level or poor C/I) or as mild as throughput degradation (latent cell reselection, forcing extensive link adaptation and then leading to congestion on the application layer). The impact of the mobile measurement capab