01.wcdma fundamentals
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The document discusses and compares key technologies and concepts between WCDMA and GSM mobile networks. It summarizes the main differences between the two standards, including carrier spacing, frequency reuse factor, power control frequency, quality control mechanisms, network planning approaches, and more. It also covers packet data capabilities and differences in downlink transmit diversity support between the two standards.
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01.wcdma fundamentals
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- 6. - + (# WCDMA GSM Carrier spacing 5 MHz 200 kHz Frequency reuse factor 1 1–18 Power control frequency 1500 Hz 2 Hz or lower Quality control Radio resource management algorithms Network planning (frequency planning) Frequency diversity 5 MHz bandwidth gives multipath diversity with Rake receiver Frequency hopping Packet data Load-based packet scheduling Timeslot based scheduling with GPRS Downlink transmit diversity Supported for improving downlink capacity Not supported by the standard, but can be applied 0%-" *% ' 4& ( ' $$%(% (/ %$$ ' ; %/ ' ; %' !$$%(% & (2
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- 18. 8 : @' : Delay∆ Code used for the connection Rx Output Finger t Cell-1 Cell-1 Cell-1 Cell-2 Rx Rx Rx Finger Finger Finger Delay∆ Delay∆
- 19. 6 0 # / Channelisation code Scrambling code Usage Uplink: Separation of physical data (DPDCH) and control channels (DPCCH) from same terminal Downlink: Separation of downlink connections to different users within one cell Uplink: Separation of mobile Downlink: Separation of sectors (cells) Length 4–256 chips (1.0–66.7 µs) Downlink also 512 chips Different bit rates by changing the length of the code Uplink: (1) 10 ms = 38400 chips or (2) 66.7 µs = 256 chips Option (2) can be used with advanced base station receivers Downlink: 10 ms = 38400 chips Number of codes Number of codes under one scrambling code = spreading factor Uplink: 16.8 million Downlink: 512 Code family Orthogonal Variable Spreading Factor Long 10 ms code: Gold code Short code: Extended S(2) code family Spreading Yes, increases transmission bandwidth No, does not affect transmission bandwidth
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- 34. : ! . # 0 Radio network planning parameters Periodical cell measurements Periodical radio link measurements RB setup/reconfiguration/release information Traffic volume measurements (triggers for DCH allocation) Updated power estimations Control of traffic volume measurements DCH allocations for NRT RB PacketPacket schedulerscheduler
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- 42. : " BS1 BS2 BS3 Received signal strength BS3 Distance from BS1 Threshold Base station diversity BS2 BS1
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- 44. :: A A < A B A * A ) A =) = =1 =< =3 =B =C : D Increased load 800 kbps Decreased coverage Low load 200 kbps Large coverage 128 kbps 64 kbps 8 kbps 144 kbps 64 kbps 64 kbps 144 kbps 144 kbps 64 kbps 64 kbps , ' $$%( # " %' ( $$ ( # " ( %5 , B %# B # '( - &'#.% # (# '# ( *' "% - % ) #'2 #& % % %# 2 0 /
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