1. In wireless system, we use different frequency configurations for each radio base station (RBS). A cell is defined as an area serviced by a RBS, and typically includes three sectors (each sector represent an antenna). For instance, a configuration 4-4-4 means that the base station has three sectors and we use 4 frequency in each sector. Sector 3 BS Sector 1 Sector 2 For this base station, answer the following questions: a) How many carrier frequencies are used in total in one cell? [5 pts) b) How many users can make phone calls in parallel in this cell if full-rate speech coding (e.g. RPE-LTP) is utilized? Don't consider frequency reuse. [5 pts] c) We can use one time slot for two parallel conversations if the more advanced half-rate speech coding (e.g. VSELP) is utilized. How many users can make phone calls in parallel (in this cell) if half-rate speech coding is utilized? (5 pts] 1. In wireless system, we use different frequency configurations for each radio base station (RBS). A cell is defined as an area serviced by a RBS, and typically includes three sectors (each sector represent an antenna). For instance, a configuration 4-4-4 means that the base station has three sectors and we use 4 frequency in each sector. Sector 3 BS Sector 1 Sector 2 For this base station, answer the following questions: a) How many carrier frequencies are used in total in one cell? [5 pts) b) How many users can make phone calls in parallel in this cell if full-rate speech coding (e.g. RPE-LTP) is utilized? Don't consider frequency reuse. [5 pts] c) We can use one time slot for two parallel conversations if the more advanced half-rate speech coding (e.g. VSELP) is utilized. How many users can make phone calls in parallel (in this cell) if half-rate speech coding is utilized? (5 pts]