10. Page 10
Step by Step
MR preprocessing
Penalty processing
Cell Ranking
Handover Judgment
characteristic adjustment
2.3 Penalty processing
2.3 Penalty processing
Types of Penalty Process
Penalty on the target cell when a HO fails.
to avoid the MS to select this cell again in next HO
judgment.
Penalty on the original serving cell when an emergency
HO ( base on BQ and TA ) is performed.
Penalty on other high priority layer cells after a fast
moving HO is performed.
to keep MS staying in the umbrella cell and avoid
frequent HO.
A new HO attempt is prohibited within the penalty time
after an overlaid/underlaid HO fails.
11. Page 11
Step by Step
MR preprocessing
Penalty processing
Cell Ranking
Handover Judgment
characteristic adjustment
2.4 Cell ranking and characteristic adjustment
2.4 Cell ranking and characteristic adjustment
M rule —— received signal level → generate candidate cell
list
DL RXLEV >= 【 HOCDCMINDWPWR 】 ＋【 MINOFFSET 】
UL RXLEV >= 【 HOCDCMINUPPWR 】 ＋【 MINOFFSET 】
K rule —— received signal level → rank candidate
cell list
After M rule, sort by level
12. Page 12
Step by Step
MR preprocessing
Penalty processing
Cell Ranking
Handover Judgment
characteristic adjustment
2.4 Cell ranking and characteristic adjustment
2.4 Cell ranking and characteristic adjustment
16 bit ranking —— calculate 16 bit value and rank
13. 2.4 Cell ranking and characteristic adjustment
Page 13
16 Bit
For 16bit algorithm. The value is small, the priority is high.
16 9
10
11
12
13
14
15 1
2
3
4
5
6
7
8
1-3 bit ： Sort by level 。
14. 4 bit ： Same layer cell handover hysteresis.
Server cell 4 bit always 0 ，
N-Cell RX level ＝ > server cell RX level + Hysteresis ， 4-bit set
to 0 ； N-Cell RX level< server cell RX level + Hysteresis ， 4-
bit set to 1 。
2.4 Cell ranking and characteristic adjustment
16 9
10
11
12
13
14
15 1
2
3
4
5
6
7
8
16. 11 bit ： load adjustment bit
Serving cell ： cell load >= TRIGTHRES ， Set to 1 and 0 Otherwise ；
Neighbor cell ： cell load >= LOADACCTHRES ， Set 1 and 0
Otherwise.
2.4 Cell ranking and characteristic adjustment
16 9
10
11
12
13
14
15 1
2
3
4
5
6
7
8
17. 12 、 13 bit ： Same BSC/MSC bit
Serving cell ： always 0
Neighbor cell ： Same BSC/MSC with serving cell ， 12/13 set to
0 ， other wise 1
2.4 Cell ranking and characteristic adjustment
16 9
10
11
12
13
14
15 1
2
3
4
5
6
7
8
18. 14 bit ： layer handover threshold bit
Serving cell: RX level>= INLAYHOTH － LEVHOHYST
， set to 0 。 Otherwise 1 ， and 13 、 12 、 10 ～ 5 bit is
all set to 0.
Neighbor cell ： RX level>= INLAYHOTH ＋
LEVHOHYST ， set to 0 。 Otherwise 1 ， and
13 、 12 、 10 ～ 5 bit is all set to 0.
2.4 Cell ranking and characteristic adjustment
16 9
10
11
12
13
14
15 1
2
3
4
5
6
7
8
19. 15 bit ： Expansion cell, set to
1.
Normal cell, set to 0.
16 bit ： reserved
2.4 Cell ranking and characteristic adjustment
16 9
10
11
12
13
14
15 1
2
3
4
5
6
7
8
20. MR Preprocessing
Penalty processing
Cell ranking
characteristic adjustment
Handover judgment
Emergency ： TA
Emergency ： BQ
Emergency ：
Level rapid decrease
Emergency ： interference
Load handover
Normal ： Edge handover
Normal ：
Layer handover
Normal ： PBGT
Send results
Force handover
Direct retry
Concentric handover
Fast move handover
2.5 Handover judgment
21. Class of handover judgment ：
Class of handover judgment ：
2.5 Handover judgment
Emergency——TA 、 BQ 、 Rxqckfallho 、 Interference
Load handover
Normal——EDGE ， Layer ， PBGT
Fast move handover
Concentric handover
22. 2.5 Handover judgment
TA ：
Serving cell of the TA is greater than the emergency
handover TA threshold.
BQ ：
1 、 According to P/N rule
23. 2.5 Handover judgment
Interference handover ：
When the RX-level is greater than a certain value, but the quality is worst
than the quality threshold.
24. 2.5 Handover judgment
Load handover
Load handover is triggered when three conditions are arrived ：
System signaling traffic is less than the allowed threshold.
The load of serving cell is higher than the load threshold.
The load of target cell is less than the load threshold.
BTS
BSC
25. Edge handover
2.5 Handover judgment
Edge handover ：
1 、 The level of serving less than the EDGE handover threshold.
2 、 P/N rule
3 、 The target cell at the top, the level no need greater than layer
threshold and hysteresis.
