Proposal for the Self-organization & Self-optimization in IEEE 802.16m System
Document Number: S80216m-08_075
Date Submitted: January 16, 2008
Source:
Juejun Liu ( juejunliu@huawei.com ), Libra Xiao (libra_xiao@huawei.com ), Zhengzheng Li (lizhengzheng@huawei.com), Ke Zeng
(zengk@huawei.com), Jianjun Yang (yougth@huawei.com ), Wu Xuyong(wuxuyong@huawei.com ), Yang Lian (yang.lian@huawei.com)
Huawei Technologies Co., Ltd.
Xiao Shanpeng (xiaoshanpeng@chinamobile.com) ,Liao wenqi (liaowenqi@chinamobile.com)
China Mobile.
Dong Xiaolu (dongxiaolu@mail.ritt.com.cn ); Du Ying (duying@mail.ritt.com.cn );
CATR.
Su Xin (suxin@mail.tsinghua.edu.cn ); Zhong Xiaofeng (zhongxf@tsinghua.edu.cn )
Tsinghua University.
Qu Hongyun (qu.hongyun@zte.com.cn ); Fang Huiying (fang.huiying@zte.com.cn )
ZTE Co. Ltd.
Venue:
IEEE 802.16 Session #53 , in Levi, Finland
Base Contribution:
S80216-08_075
Purpose:
For discussion by IEEE 802.16 Working Group
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Contents
• What’s the purpose of organization
– scope
• What to be organized
– entity and components
• When to organize
– environments status & relationships
• How we can organize
– coordinative or uncoordinative
2
What’s the purpose of organization
scope
Self Installation and Configuration
• Automatic resource allocation and distribution optimization
– To avoid or eliminate the impact of harmful/destructive interference
Network throughput ensuring
• Interference prevention & resolution
– That’s what we can also understand as interference impact mitigation
Enhancement for Coverage Awareness (for operator)
• Adjacent Blind Area information report
– That’s combine the impact from deserved signal and interference signal
3
What to be organized
entities and components
•
System
–
•
Community
–
•
A Base Station and its Subscribers
A Community is composed of those systems which coordinate to resolve their interference.
These systems can be operated by the same or different operators.
Interference Neighborhood
–
An Interference neighborhood relates to a specific system. A system will perceive as an
interference neighbor of other systems which create/receive harmful interference to/from it.
The Figure blow shows some examples of neighborhood.
Neighborhood of system D
E
Neighborhood of system J
G
K
D
F
I
A
H
C
J
M
L
Neighborhood of system A
X
system
Neighbor relationship
4
When to organize
environments status
• A system’s environment status is a collective radio signal situation
of its BS and SSs, which compose of deserved signal and
interference:
– Signal Quality on the Receiver: RSSI & SINR
– Interference impact: SINR degradation from interference (or INR)*
– Interference source of the receiver which encounter harmful interference
(for collaborative mechanism only)
•
•
BS is responsible to collect the system’s environment status
SS is responsible to report its recent radio signal situation to its
serving BS
Light Interference
Threshold
0
Acceptable Interference
Threshold
1
Acceptable
Interference
Receiver
SINR (dB)
Current
SINR
Requirement of current
modulation/coding
SINR degradation
Caused by
interfenrece(dB)
Destructive
Harmful
Interference Interference
Requirement of most
robust modulation/coding
5
When to organize
relationships
Relationships is between systems:
• Neighbor Relationship:
it is a relationship between two systems, when the BS in at least
one of these two systems may create interference higher than
the acceptable interference threshold to at least one SS in
another system, or at least one of the SSs in at least one of
these two systems may create interference higher than the
acceptable interference threshold to the BS in another system.
It is assumed that SS to SS interference and BS to BS interference
are resolved in advance by frequency separation (in case of
FDD systems) or transmission frame synchronization (in case of
TDD).
• Neighbor:
A system is called a neighbor of system A, when it has a neighbor
relationship with system A.
6
When to organized
relationships-formed by bi-directional interference
SS
associated
BS
System C
ass
ted
interference
a
ci a
s so
SS
oci
a
t ed
SS
SS
oci
as s
d
at e
inte
rf er
e
associated
rfe
r
en c
ia
oc
as s
ass
ted
associated
SS
oc
ia
BS
d
c iate
a sso
SS
in t
e
ed
interference
BS
System B
BS
nce
a sso
c iat
SS
as s
oc
i at
ed
associated
SS
SS
t ed
e
SS
SS
SS
System D
System A
7
When to organize
relationships-formed by unidirectional interference
System E
SS
SS
eren
ce
ed
i at
c
o
ass
associated
BS
ass
oci
ate
d
SS
int e
rf
SS
associated
d
SS
BS
e
iat
e
nc
e re
erf
oc
ass
t ed
t
in
as s
oc
ia
System F
SS
8
When to organize
relationships- Geographical & Encounter Neighbor
• Geographical Neighbor:
– The Geographical neighbor relationship means at least one
station in one of the system will be interference victim of at least
one station in another system if they allocate the frequency into
co-channel or adjacent channel.
• Encounter Neighbor:
– The Encounter neighbor relationship means at least one station
in one of the system is an interference victim of at least one
station in another system.
9
How we can organize
coordinative or uncoordinative
•
Coordinative mechanism relies on the exchange of protocol-based
signaling in radio within Geographical neighborhood.
– Stations in system need to measure radio signal parameters
– Stations in system need to identify the interference source
– BS take the responsibility to coordinate the action of its whole system and be
responsible to negotiate among neighborhood/ community
•
Uncoordinative mechanism relies on the only the radio information within
the system, and do not exchange protocol-base signaling in radio within
Geographical neighborhood.
– Stations in system need to measure radio signal parameters
– Stations in system do not identify the interference source
– BS take the responsibility to coordinate the action of its whole system but not
negotiate with other system
•
Both Coordinative and Uncoordinative solution should be considered
according to different usage scenario
10
Conclusion
• 16m should refine scope of SON mechanisms
and define entities and components, e.g.
– System
– Community
– Neighborhood
etc.
• 16m should include both coordinative and
uncoordinative approaches for SON.
11
Thanks!
12