us downlink data volume Capacity Optimization UL data volume per hour (MB) Figure 13.7 User activity during a normal working day versus uplink data volume The user behaviour during a normal day can be analyzed based on Figures 13.6 and 13.7 as below: 1. During the night time (01.00-05:00) each of the registered users generates roughly 10 E-RABs per hour, receives roughly 1 MB of data and transmits roughly 0.1 MB per hour. 2. During the morning hours (05:00-08:00) the number of E-RABs per hour per registered user rapidly increases from 10 to 18 and data volume per hour increases to 2 MB in downlink and 0.3 MB in uplink. 3. During the working hours (08:00-18:00) each registered user generates 15-19 E-RABs per hour and data volume per hour is around 3 MB in downlink and 0.3-0.4 MB in uplink. 4. During the evening hours (18:00-23:00) the amount of E-RABs per registered user per hour decreases to around 15 while data volume per hour in downlink increases close to 4 MB and in uplink close to 0.5 MB. 5. During the late evening hours (23:00-01:00) the data volume per registered user quickly decreases to 1 MB in downlink and to 0.1 MB in uplink and the number of E-RABs decreases to 10 per registered user per hour. During the normal working days the user activity (data volume and signalling) changes quite a lot depending on the hour of the day and this causes big changes to the capacity demand in different parts of the network in different times. This should be taken into account when predicting the capacity demand for business areas (users located during office hours) and residential areas (users located during non-office hours). The mass event causes impact to relatively small area (limited number of cells) but the impact should be carefully considered and capacity estimation should be done taking into account the increase in the number of subscribers and signalling increase due to that as well as massive increase in uplink data volumes per E-RAB. 13.3 Uplink Interference Management Due to the massive uplink traffic incr