Virtual single cells over
a micro-cellular network
along roads supporting
vehicular multimedia
Takahiko Yamada
Ritsumeikan University
Japan
The Fully Networked Car
Geneva, 3-4 March 2010
1
Outline
o A new paradigm and its component network
1.
2.
Macro-cell vs. micro-cell
Concept of a new paradigm and new network
o A virtual single cell with micro-cells
1.
2.
3.
Logical Macro-Cells and multiple polling
Anonymous polling for registration
Support by IP-based paging network
o Exceptional procedures
1.
2.
3.
Directional change at cross section
No response to polling
Cell overlapping
o Performance evaluation
o Application
The Fully Networked Car
Geneva, 3-4 March 2010
2
Macro-cells vs. micro-cells towards mobile multimedia
Macro-cells
o Wide service area
o Reuse of existing facilities
o Small reuse of radio band
o Difficulty in ultra high band
Micro-cells
o Large reuse of radio band
o Simplified parameters for design
o Narrow service areas
o Frequent handover
o New investment
The Fully Networked Car
Geneva, 3-4 March 2010
3
A new network and paradigm
A new paradigm
(an integrated mobile network)
IP-based
paging network
Integrated
cellular network
A new network
(a virtual single cell)
The Internet
Macro-cellular network
: PS
The terrestrial
network with PON
A virtual single cell
Hot spots & FMC
• Vertical handover among cells
• MT with soft-defined radio
The Fully Networked Car
Geneva, 3-4 March 2010
Connected micro-cells along roads
FMC: Fixed Mobile Conversion
PON: Passive Optical Network
PS: Passive Splitter
4
Virtual single cell concept
5
(a) LMC (Logical Macro-Cell) as a virtual single cell unit.
R
S
LMC
S
P
M
R
S
P: Polling
R: Polling response
M S
S M
S
M: Main cell
S: Sub cell
(b) Virtual single cell with Concatenated LMC.
P&R
LMC#i-1
- LMC#i
LMC#i+1
The Fully Networked Car
Geneva, 3-4 March 2010
Anonymous polling (Contention invitation)
for registration contention
Anonymous polling (AP) for registration
Minimized overhead
o Registration with minimized ID
o Polling to the registered terminal to get the detail
o Quick detection of no response (Detection of no carrier)
Collision avoidance
o Back-off making use of the number of polling
o Anonymous polling to the sub-group
o Anonymous polling to a divided area
No request
APRR P D
P D AP P D
Collision
P D APRR P D AP RR
Mobile Terminals
AP: Anonymous Polling, RR: Slotted Registration Request,
P: Polling, D: Data Transfer
The Fully Networked Car
Geneva, 3-4 March 2010
6
Avoidance of inefficient polling
taking advantage of IP-based paging
o Cease of polling when no packet transfer continues
o Restart of polling after the registration from the terminal side
o Paging and registration when called from the network side
Call
The Internet
IP-based paging network
Paging service
request
Mobile
network
Mobile
terminal
Dormant
Active session
Paging
Waiting
for call
Request with AP registration.
The Fully Networked Car
Geneva, 3-4 March 2010
7
Mobile VLAN as an advanced mobile service
MM-MAN on
virtual single cell
Mobile VLAN
Company A
LAN
The Internet
Mobile VLAN
Virtual single cell
locates in a
metropolitan area.
The Fully Networked Car
Geneva, 3-4 March 2010
Company B
LAN
MM-MAN: Mobile Multimedia
Metropolitan Area Network
8
Handover latency (ms)
Handover latency
900
800
700
600
500
400
300
200
100
0
-100
9
Standard contention
SynScan
Parallel-polling
5
10
15
20
25
Number of mobile terminals
The Fully Networked Car
Geneva, 3-4 March 2010
30
Performance evaluation
Data packet size: 1000bytes. MT speed: 60km/h
The Fully Networked Car
Geneva, 3-4 March 2010
10
Concluding remarks
o Virtual single cell with micro-cells allows
high bit rate packet transfer to fast MT
o Virtual single cell can reduce traffic in the
macro-cellular network
o Integrated mobile network and IP-based
paging network with virtual single cell will
be main players in future mobile network
o There can be hopeful mobile services like
mobile VLAN
The Fully Networked Car
Geneva, 3-4 March 2010
11
Directional change of the virtual single cell
Micro-cells and MT
movement.
Switchover of LMC
LMC
#2
1 2 3
1 2
3
X
5
6
7
#3
2 3 X
B 3 X D 5
X D E
1 2 3 X D E F
MT’s movement
The Fully Networked Car
Geneva, 3-4 March 2010
D E F
#X
#D
#E
12
Power control to the next cell through the terrestrial
network to avoid the ping pong handover
(a)Power up of polling in the main cell
Stable range
Power control through
the terrestrial network
(b)Power up in the new main cell and
power down in the old main cell
Stable range
The Fully Networked Car
Geneva, 3-4 March 2010
13
Re-polling indication when no response in every cell
Handover
Regular polling
S
S
P
M
P
M
S
S
M
R
S
P
S
Polling indication
Time out
No response
S
M
P
S
The Fully Networked Car
Geneva, 3-4 March 2010
S
M
S
S
P
R
M
S
Polling indication
(2 cycles)
S
M S
S M
P
R
Polling indication
14
Exceptional conditions
Sub-cell
Radio space S1
Main cell
M
Sub-cell
S2
1
2
Overlap of cells
3
4
5
The Fully Networked Car
Geneva, 3-4 March 2010
15