The Fully Networked Car Geneva, 3-4 March 2010

1

Takahiko YamadaRitsumeikan University

Japan

Virtual single cells over a micro-cellular network along roads supporting vehicular multimedia

The Fully Networked Car Geneva, 3-4 March 2010

Outline

o A new paradigm and its component network1. Macro-cell vs. micro-cell2. Concept of a new paradigm and new network

o A virtual single cell with micro-cells1. Logical Macro-Cells and multiple polling2. Anonymous polling for registration 3. Support by IP-based paging network

o Exceptional procedures1. Directional change at cross section2. No response to polling3. Cell overlapping

o Performance evaluationo Application

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The Fully Networked Car Geneva, 3-4 March 2010

Macro-cells vs. micro-cells towards mobile multimedia 3

Macro-cells

Micro-cells

o Wide service areao Reuse of existing facilitieso Small reuse of radio bando Difficulty in ultra high band

o Large reuse of radio bando Simplified parameters for designo Narrow service areaso Frequent handovero New investment

The Fully Networked Car Geneva, 3-4 March 2010

A new network and paradigm 4

IP-based paging network

• Vertical handover among cells• MT with soft-defined radio

Macro-cellular network

A virtual single cell

Hot spots & FMC

A new paradigm(an integrated mobile network)

A new network(a virtual single cell)

The Internet

Connected micro-cells along roads

The terrestrial network with PON

FMC: Fixed Mobile ConversionPON: Passive Optical Network PS: Passive Splitter

: PS

Integrated cellular network

The Fully Networked Car Geneva, 3-4 March 2010

P R

Virtual single cell concept 5

S M S

S M S S M

-

(b) Virtual single cell with Concatenated LMC.

LMC#i-1

P: PollingR: Polling response

S

M: Main cellS: Sub cell

(a) LMC (Logical Macro-Cell) as a virtual single cell unit.

R

LMC

LMC#i

LMC#i+1

P&R

The Fully Networked Car Geneva, 3-4 March 2010

Anonymous polling (Contention invitation)for registration contention

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RRAP DP

AP: Anonymous Polling, RR: Slotted Registration Request, P: Polling, D: Data Transfer

AP: Anonymous Polling, RR: Slotted Registration Request, P: Polling, D: Data Transfer

DP AP DP DP RRAP DP RRAP

No request Collision

Mobile Terminals

Anonymous polling (AP) for registration

Minimized overheado Registration with minimized ID o Polling to the registered terminal to get the detailo Quick detection of no response (Detection of no carrier)Collision avoidanceo Back-off making use of the number of pollingo Anonymous polling to the sub-group o Anonymous polling to a divided area

The Fully Networked Car Geneva, 3-4 March 2010

Avoidance of inefficient pollingtaking advantage of IP-based paging

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IP-based paging network

Dormant

Request with AP registration.

Active session

Mobile terminal

Paging

Mobile network

Waiting for call

Paging service request

Call

The Internet

o Cease of polling when no packet transfer continueso Restart of polling after the registration from the terminal side o Paging and registration when called from the network side

The Fully Networked Car Geneva, 3-4 March 2010

Mobile VLAN as an advanced mobile service 8

MM-MAN on virtual single cell

The Internet

Company A

LAN

Company B

LANMobile VLAN

Mobile VLAN

MM-MAN: Mobile MultimediaMetropolitan Area Network

Virtual single cell

locates in a metropolitan area.

The Fully Networked Car Geneva, 3-4 March 2010

Handover latency 9

-1000

100200300400500600700800900

5 10 15 20 25 30

Number of mobile terminals

Han

dove

r la

tenc

y (m

s)

Standard contention

SynScan

Parallel-polling

The Fully Networked Car Geneva, 3-4 March 2010

Performance evaluation 10

Data packet size: 1000bytes. MT speed: 60km/h

The Fully Networked Car Geneva, 3-4 March 2010

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

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The Fully Networked Car Geneva, 3-4 March 2010

Directional change of the virtual single cell 12

3 X

D5

B

6

E

2

A

7

Micro-cells and MT movement.

1 2 3

2 3 X

3 X D

X D E

D E F

Switchover of LMC

B 5

#2

#3

#X

#D

#E

LMC

1

F

1 2 3 X D E F

MT’s movement

The Fully Networked Car Geneva, 3-4 March 2010

Power control to the next cell through the terrestrial network to avoid the ping pong handover

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(a)Power up of polling in the main cell

(b)Power up in the new main cell and power down in the old main cell

Stable range

Stable range

Power control through Power control through the terrestrial networkthe terrestrial network

The Fully Networked Car Geneva, 3-4 March 2010

Re-polling indication when no response in every cell 14

Regular polling

PM

S

S

Handover

P

R M S

S

S M

P

RM

S

S

PM

S

S

Polling indication Polling indication

No response

PM

S

S

P

RM

S

S

Polling indication(2 cycles)

M

S

S

Time out

The Fully Networked Car Geneva, 3-4 March 2010

Exceptional conditions 15

Main cellM

Sub-cellS2

Sub-cellS1

Radio space

Overlap of cells

1

2

3

4

5