More than 10% Spectrum Gain by GSM DFA Same Network Capacity, Less Frequency Points
Bandwidth 11.6M
DFA
SFA
0
57
11.6M
18
11M
15
10.4M
12
9.8M
9
39 (BCCH 4*3)
Performance Loss : 1.04%
•
Traffic Model: 6TRX@80% load
14
GB
12
100.00% 11.6
11.6
11
10.4
10
1
Frequency Saving Gain>10% 99.00%
•
9.8
9.2
97.00%
6
96.00%
4
95.00%
2
94.00%
0
9.2M
6
SFA: Static Frequency Allocation
DFA: Dynamic Frequency Allocation
93.00% S57+D0
GB: Guard Band
98.00%
8
S39+D18
S39+D15
Bandwidth
S39+D12 DL RQ(0~3)
S39+D9
S39+D6
UL RQ(0~3)
At same network capacity, configuration bandwidth reducing from 11.6MHz to 10.4MHz will bring negligible network performance loss (around 1%), by which frequency points saving gain is more than 10%
Uplink RQ drop rate is obviously better than downlink because of uplink interference cancelling technology
GSM/LTE Dynamic Bandwidth Extension (DBE) C-SON is ZTE’s SON system C-SON server predicts GSM and LTE required BW according to history traffic load
eNB
DBE Principle decide whether to extend BW based on
current traffic load when GSM released BW
LTE eNB
for sharing
eNB MUST release extended BW when GSM
traffic load increases BSC decide whether to release or recycle BW based on current traffic load and Note: iCS server will replace C-SON server from Jan. 2016
LTE 10M
GSM/LTE Dynamic Sharing
LTE
GSM
GSM/LTE Dynamic Sharing
BSS
When GSM released shared BW, LTE will decide whether to extend its BW
The candidate LTE BW extension set is [3MHz,5MHz],[5MHz,10MHz],[10MHz,15MHz] and [15MHz,20MHz]
When GSM traffic load increases, eNB MUST release the shared BW for GSM
