IEEE C802.16m-09/0105r1
Project
IEEE 802.16 Broadband Wireless Access Working Group <http://ieee802.org/16>
Title
LBS Support for Multi-carrier in 16m
Date
Submitted
2009-01-11
Source(s)
Jia Lin, Sean McBeath, Junxian Mo
E-mail: linjia@huawei.com
Huawei Technologies
smcbeath@huawei.com
I-Kang Fu, Yih-Shen Chen, Kelvin Chou
IK.Fu@mediatek.com
MediaTek Inc.
Ying Du, Daning Gong
duying@mail.ritt.com.cn
CATR
Re:
IEEE 802.16m-08/052: Call for Comments on Project 802.16m System Description
Document (SDD), Section 13.1 Location Based Services Overview and Section 19.4
MAC Aspect of OFDMA Multi-carrier Operation
Abstract
This contribution proposes LBS Support for Multi-carrier in 16m.
Purpose
For discussion and adoption by IEEE 802.16m group
Notice
Release
Patent
Policy
This document does not represent the agreed views of the IEEE 802.16 Working Group or any of its subgroups. It
represents only the views of the participants listed in the “Source(s)” field above. It is offered as a basis for
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LBS Support for Multi-carrier in 16m
Jia Lin, Sean McBeath, Junxian Mo
Huawei Technologies
I-Kang Fu, Yih-Shen Chen, Kelvin Chou
MediaTek Inc.
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IEEE C802.16m-09/0105r1
Ying Du, Daning Gong
CATR
1. Introduction
Location based services (LBS) are information services accessible with mobile devices through the mobile
network and utilizing the ability to make use of the location of the mobile device.
As described in the SDD, for non-GPS measurement method in the DL, the AMS receives signals which are
existing signals (e.g. preamble sequence) or new signals designed specifically for the LBS measurements, if it is
needed to meet the requirement from the serving/attached ABS and multiple neighboring ABSs/ARSs. The
AMS accurately calculates the required measurements, even in the presence of multi-path channel and heavy
interference environment, and then estimates its location accordingly.
In UL, various approaches can be utilized at the serving/attached ABS/ARS to locate the AMS such as TOA and
AOA. These measurements are supported via existing UL transmissions (e.g. ranging sequence) or new signals
designed specifically for the LBS measurements.
Since Multi-carrier is introduced into IEEE802.16m, in this contribution, we propose LBS techniques which
take advantage of the multi-carrier operation.
2. LBS support for Multi-carrier
For non-GPS measurement method, in DL/UL, AMS receives/transmits signals from/to multiple ABSs for LBS
measurement. As is known for single carrier operation, most LBS measurement methods (such as TOA and UTDOA) need to be performed between AMS and multiple ABSs at different times. It means that AMS only
receives/transmits measurement signals from/to one ABS per transmission/reception opportunity. For example,
when U-TDOA measurement is being performed, serving ABS should negotiate with neighbor ABSs to get
dedicated ranging resource for location measurement, and send these measurement parameters to AMS. Then,
AMS can use the dedicated ranging information and measurement parameters to send dedicated CDMA codes to
these ABSs through single carrier at different rendezvous times.
For multi-carrier scenario, we propose that LBS measurement can be performed through multiple carriers at the
same time, which means that it can reduce signaling overhead and time delay. The ABS can inform the AMS to
perform LBS measurement procedures (such as TOA, TDOA) through one or multiple AMS’s carriers (primary
carrier or secondary carriers) for LBS measurement. The message may include carrier indices, LBS
measurement methods, ABS IDs, Rendezvous time, CDMA codes, Tx opportunity offsets, etc.
Meanwhile, as Figure 3 show, when data is being transmitted between AMS and ABS through one or multiple
carriers, LBS measurement can be performed in the AMS’s other carriers at the same time, which helps maintain
QoS of data traffic.
The following are some examples of LBS measurement procedures for Multi-carrier:
1) U-TDOA measurement for Multi-carrier
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IEEE C802.16m-09/0105r1
Serving
ABS
AMS
Neighbor
ABS
1. Request non-serving ABS to assign a
dedicated ranging opportunity for the MS
(frame number)
2. Assignment of the dedicated ranging
opportunity by non-serving ABS (carrier
index, frame number, CDMA code, tx
opportunity offset)
3. Allocation of CDMA code, carrier
index and tx transmission
opportunity for dedicated ranging
between the AMS and the Serving
ABS.
4. MOB_SCN-RSP (scanning ABSs'
IDs,carrier indexs, Rendezvous time, CDMA
code, Tx opportunity offset)
5a. Grant UL BW grants to
AMS for the unicast ranging.
5b. Grant UL BW grants to
AMS for the unicast ranging.
6a. Dedicated CDMA code(Carrier A)
6b. Dedicated CDMA code(Carrier B)
Rendezvous time
7a. Measure timing
adjustment = t2
7b. Measure timing
adjustment = t3
8.RSP(Carrier A)
10.Let Serving ABS knows that neighbor ABS
received Dedicated CDMA code, and Return
t3 ro serving ABS.
11.RSP(Carrier B)
12. T1 = (t2-t3)/2
Figure 1: Example of U-TDOA measurement
2) RTD based measurement for Multi-carrier
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IEEE C802.16m-09/0105r1
AMS
Neighbor
ABS 1
Serving ABS
1.LBS-REQ
(RTD measurement,carrier
index、ABS IDs and
measuremet time)
2a.Mseasure RTD between AMS and serving ABS
through carrier A in given time
2b.Mseasure RTD between AMS and neighbor ABS1 through carrier B in
given time
2c.Mseasure RTD between AMS and neighbor ABS2 through carrier C in given time
3. LBS-RSP
(RTDs, ABS IDs)
Location measurement
Figure 2: Example of RTD based measurement
3) Perform LBS measurement and data transmission through different carriers
4
Neighbor
ABS 2
IEEE C802.16m-09/0105r1
AMS
Neighbor
ABS 1
Serving ABS
Neighbor
ABS 2
1.LBS-REQ
(RTD measurement,carrier
index、ABS IDs and
measuremet time)
2a.Data transmission between serving ABS and
AMS through Carrier A.
2b.Perform LBS measurement from Neighbor ABS 1 to Neighbor ABS N through Carrier B and/or C
3. LBS-RSP
(RTDs, ABS IDs)
Location measurement
Figure 3: Example of perform LBS measurement and data transmission through different carriers
3. Summary
LBS support in Multi-carrier provides the following benefits.
1) Reduced time delay for performing LBS measurement
2) Increased LBS measurement accuracy
3) Reduced signaling overhead for performing LBS measurement
4) Increased QoS support for data traffic
4 Proposed Text
The following text is proposed to be captured in the IEEE 802.16m system description document (SDD).
================================= Start of Proposed Text ==============================
13.1 Location Based Services Overview
In order to enhance location based service, AMS should send report location-related information
which includes the location information or the measurement for determining location in response to
the request of ABS or according to the location information report condition to measure its location. In
addition, LBS is supported for AMS in connected state as well as idle state. For the connected state,
AMS can report location information when it is needed. For the idle state, AMS should perform
location information reporting when it is paged, and report location information when it is needed.
The AMS positioning is performed by using measurements methods, such as TDOA, TOA, AOA, and
etc., whose relevant location-related parameters may includes cell-ID, RSSI, CINR, RD, RTD, angle,
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IEEE C802.16m-09/0105r1
and Spatial Chanel Information. These parameters are exchanged between the AMS and its
serving/attached and neighboring ABSs/ARSs. These measurements of these parameters are
extracted by processing DL and/or UL signals at the AMS and ABSs, respectively. Positioning
algorithms that depend on such measurements have certain performance tradeoffs in terms of
positioning accuracy, latency, and signaling overhead. Two or more measurements can be utilized to
provide higher accuracy estimate of the AMS position.
The multi-carrier AMS which is capable of processing multiple radio carriers at the same time may
perform LBS measurement on one or multiple carriers.
19.4.11 LBS Support
The multi-carrier AMS which is capable of processing multiple radio carriers at the same time may
perform LBS measurement on one or multiple carriers.
==================================== End of the Text ================================
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