Transcript Motive
Location-Based Network Discovery for 802.16m
IEEE 802.16 Presentation Submission Template (Rev. 9)
Document Number:
IEEE C802.16m-08/1165
Date Submitted:
2008-09-05
Source:
Won-Ik Kim, Sungcheol Chang, Kwangjae Lim, Sunggeun Jin, Hyun Lee, Chulsik Yoon.
Voice: +82-42-860-6471
E-mail: {woniks, scchang, kjlim, sgjin, hyunlee, csyoon}@etri.re.kr
ETRI
161 Gajeong-dong Yusong-gu Daejeon, Korea
Venue:
Re : MAC: Location Services; in response to the TGm Call for Contributions and Comments 802.16m-08/033 for Session 57
Base Contribution:
IEEE C802.16m-08/1165
Purpose:
To discuss and adopt the proposed text in the next revision of the 802.16m SDD
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Background
• Multi-Radio Network Discovery
– It is necessary in order to support inter-RAT handover in the
multi-radio environment.
– It makes possible that multi-mode MS discovers the available
Access Networks (ANs) and monitors their status.
– Multi-mode MS
• Equipped with multiple radio interfaces
• Should activate radio-interfaces and scan ANs in time.
– Additional power consumption of MS is not desired due to
frequent network discovery
• Necessity of power-efficient network discovery
– Can reduce power consumption of MS by using Location-Based
Services (LBS) considering multi-radio environments
Network Discovery
• Two Approaches for Network Discovery
– Periodic Network Discovery
– Location-based Network Discovery
• Periodic Network Discovery
– Mobile Station (MS) periodically scans ANs at a regular interval.
– If it scans more frequently
• Pros : it may be possible to detect ANs more quickly and more
accurately.
• Cons : MS consumes more energy.
– Power consumption of MS highly depends on scanning
frequency.
Location-based Network Discovery
Figure 1
1
• MS activates a radio-interface for
scanning an AN when it enters a
coverage of a non-802.16m BS.
Geo-location Map
Interworking
2
Non-16m BS’s
location
information
• Can reduce the energy required
for scanning compared with
periodic network discovery.
16m
BS
Non-16m
BS
Multi-mode
MS
3 MS Location Tracking
& Distance Estimation
4 - Radio-interface activation
- Scanning (Dectection)
- Network Discovery Success
Proceed to Network Selection
• Requirements
– MS should be able to support a
LBS.
– It should be possible to collect the
location information of ovelaid
ANs.
• Ex) Need to share the location
map between 802.16m system
and non-802.16m system.
– Transfer the collected AN’s
location information to a MS
Location-based Network Discovery
• Network Discovery Information
– Include assistance data to allow the MS to discover available
ANs.
• Refer to 3GPP TS 23.402 and 3GPP TS 24.302.
– 802.16m BS provides the MS with network discovery information.
• Proposed additional Information for Location-based
Network Discovery
– Location information of overlaid non-802.16 BSs
• To measure the distance between a MS and a (non-16) BS
• Similar to TLV for the geo-location information of legacy LBS-ADV
• ex) Absolute Position, Relative Position, GPS Time, Frequency
Accuracy
– Service-available range of overlaid non-802.16 BSs
• Service_Coverage (may be denoted by meters)
– Service-available coverage recommended by non-802.16 systems
• For network discovery triggering
– “Distance between a MS and a BS” <= “Service_Coverage”
Location-based Network Discovery
• How to transfer a Network Discovery Information
– Query & Response
• MOB_LBS-REQ (MS BS)
– Include AN IDs.
• MOB_LBS-RSP (BS MS)
– Include location information of available non-802.16m BSs
demanded by the MS.
– Broadcast (LBS advertisement)
• Can use advertisement messages, such as legacy LBS-ADV
– Include location information of non-802.16m BSs overlaid with
a 802.16m BS.
– The location information can be included in LBS-ADV.
Text proposal for SDD
Insert the following text into Support for Location Based Services clause
(Chapter 14 in [IEEE 802.16m-08/003r4])
------------------------------- Text Start ------------------------------14 Support for Location Based Services
14.x LBS Application for Multi-Radio Environments
In order to discover access networks supporting LBS over multiradio environments, 802.16m systems need to share the location
information with non-802.16 systems, and provide to multi-mode MS
with the assistance data for the location-based network discovery,
such as a location information and service-available coverage
information of overlaid non-802.16 BSs. The MS may obtain the
assistance data by querying the 802.16m systems or by receiving
LBS advertisement (LBS-ADV) messages.
------------------------------- Text End -------------------------------
Appendix
Comparison of Network Discovery
•
Sampling of an acess network detection point (Max. Speed of MS: 10km/h)
Location-based Network Discovery
355
355
345
345
335
335
y (meter)
y (meter)
Periodic Network Discovery
325
315
315
305
305
295
Simulation Layout
325
About
300m
295
70
80
90
100
110
x (meter)
120
130
70
80
90
100
110
x (meter)
120
130
Network detection point of multi-mode MS
Average number of access network scanning
8
Periodic Network Discovery
Avg. Num of Access Network Scanning
•
16m
BS
Location-based Network Discovery
7
6
5
4
3
2
1
10
20
30
Max. Mobile Speed (km/h)
50
About
60m
Non-802.16
BS