IEEE C802.16m-10/0492
Project
IEEE 802.16 Broadband Wireless Access Working Group <http://ieee802.org/16>
Title
Proposed text related to secondary carrier pre-assignment during MCHO (16.2.8.2.9.2.3)
Date
Submitted
2010-04-29
Source(s)
Eunjong Lee, Youngsoo Yuk, Kiseon Ryu
LG Electronics
E-mail: eunjong.lee@lge.com, youngsoo.yuk@lge.com,
kiseon.ryu@lge.com,
Re:
IEEE 802.16 Working Group Letter Ballot #31a
Abstract
The contribution proposes the text of multi-carrier operation to be included in the 802.16m
amendment.
Purpose
To be discussed and adopted by TGm for the 802.16m Amendment.
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 discussion.
It is not binding on the contributor(s), who reserve(s) the right to add, amend or withdraw material contained herein.
The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution,
and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any
IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion
to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also
acknowledges and accepts that this contribution may be made public by IEEE 802.16.
The contributor is familiar with the IEEE-SA Patent Policy and Procedures:
<http://standards.ieee.org/guides/bylaws/sect6-7.html#6> and
<http://standards.ieee.org/guides/opman/sect6.html#6.3>.
Further information is located at <http://standards.ieee.org/board/pat/pat-material.html> and
<http://standards.ieee.org/board/pat>.
Proposed text related to secondary carrier pre-assignment
during MCHO (16.2.8.2.9.2.3)
Eunjong Lee, Youngsoo Yuk and Kiseon Ryu
LG Electronics
1. Introduction
In this contribution, we propose that the serving ABS indicates whether the AMS and the target ABS should
negotiate their MC capability after HO with secondary carrier pre-assignment.
2. Discussions
In the current MC operation, the serving ABS can pre-assign the secondary carrier(s) to an AMS through
Carrier_Preassignment_Indication in AAI_HO-CMD message. When the secondary carrier is pre-assigned, the
AMS doesn’t need to exchange its MC capability with target ABS (i.e., AAI_MC-REQ/RSP exchange) as well
1
IEEE C802.16m-10/0492
as the AMS can activate the secondary carrier immediately after MCHO, if the pre-assigned secondary carrier
information is transmitted in AAI_HO-CMD message. For this pre-assignment, the serving ABS has to forward
the MC capability of the AMS to the target ABS(s) via backbone and receive the information of the
pre-assigned secondary carriers before transmitting the AAI_HO-CMD to the AMS, as shown in Figure 423 of
IEEE 802.16m/D5.
However, since the MC capability of the AMS had been determined on the basis of the MC configuration
supported by the serving ABS, which is indicated in the AAI_MC-ADV message, the target ABS may require
updating MC capability of the AMS if the MC configuration is different from the serving ABS. However, the
current MCHO is not considering the secondary carrier pre-assignment for this case.
According to the current texts, when the secondary carrier is pre-assigned, the AMS doesn’t need to perform the
MC capability negotiation with target ABS (i.e., AAI_MC-REQ/RSP message exchange). In addition, once the
secondary carrier(s) is assigned to the AMS, the AMS cannot request updating its assigned secondary carrier(s)
during the MC operation. In order to solve these problems, we can firstly consider that the ABS always
performs MCHO without the secondary carrier pre-assignment for this case. However, this method leads to a
delay in the data communication over multiple carriers because the AMS is able to perform the MC operation
only after MC capability negotiation. The ABS can firstly allocate a subset of secondary carriers based on the
MC capability information of the AMS which is received from serving ABS although the MC configuration is
different from the serving ABS.
Therefore, we propose that the serving ABS indicates whether the AMS should newly negotiate its MC
capability with the target ABS or not, after performing MCHO with secondary carrier pre-assignment. In here,
the AMS should determine the MC capability based on the MC configuration supported by the target ABS,
which is indicated in the AAI_NBR-ADV message and the target ABS may transmit the AAI_MC-RSP message
to update the assigned secondary carriers.
3. References
[1] IEEE P802.16m/D5, “DRAFT Amendment to IEEE Standard for Local and metropolitan area networks”
4. Text proposal for the 802.16m DRAFT amendment
-----------------------------------------------------------------------Start of the Text-----------------------------------------------------------[Insert the texts at line 56 in Table 692 on page 108 as follows:]
16.2.3.11 AAI_HO-CMD
Table 692—AAI_HO-CMD MAC Control Message Format
M/O
O
Attributes/Array of
attributes
Service level prediction
Size (bit)
2
Value/Note
Conditions
Indicates the level of service the AMS can expect from Shall be included for each
2
IEEE C802.16m-10/0492
O
Physical_Carrier Index
8
O
Channel bandwidth
8
O
CP length
2
O
Carrier Preassignment
Indication
this ABS. The following encodings apply:
target ABS when Mode =
0 = No service possible for this AMS
0b00
1 = Some service is available for one or several service
flows authorized for the AMS
2 = For each authorized service flow, a MAC
connection can be established with QoS specified by
the AuthorizedQoSParamSet.
3 = No service level prediction available.
Should be included for
each target ABS which is
multi-carrier ABS when
Physical carrier index of the recommended Target Mode = 0b00 and target
ABS
ABS is not included in
AAI_NBR-ADV message
or is multi-carrier
ABS.
Shall be included for each
target
ABS
when
Channel bandwidth of recommended target ABS in
Mode=0b00 and target
units of 125 KHz.
ABS is not included in
AAI_NBR-ADV message
Shall be included for each
CP length of the recommended target ABS
target
ABS
when
00: 1/8
Mode=0b00 and target
01: 1/16
ABS is not included in
10: 1/4
AAI_NBR-ADV message
Shall be included for an
1
0: no pre-assigned secondary carrier
AMS with multi-carrier
1: information of pre-assigned secondary carriers by
capability when Mode =
the target ABS is included in this message;
0b00
O
AAI_MC-REQ/RSP
message
exchange
indicator
1
O
N_Preassigned_Carrie
rs
3
Indicates whether AMS and ABS shall exchange the
AAI_MC-REQ/RSP message after network reentry.
0: no exchange
1: shall be exchanged
Number of pre-assigned secondary carriers at the
target ABS. A value of 0 means no secondary is
pre-assigned.
Shall be included when
Carrier
Preassignment
Indication = 1
Shall be included when
Carrier
Preassignment
Indication = 1
[Add the texts at line 53 on page 308 as follows:]
16.2.8.2.9.2.3 HO with secondary carrier pre-assignment
The serving ABS may negotiate with the target ABS for secondary carrier pre-assignment as illustrated in
Figure 423. When Carrier_Preassignment_Indication is set to 1 in the AAI_HO-CMD message, the
pre-assignment information is forwarded from the Target ABS(s) via backbone to the Serving ABS, and then
sent to the AMS by the serving ABS through AAI_HO-CMD message, and part of the pre-assigned secondary
carriers (indicated by the Carrier Status Bitmap) may be activated right after network reentry. The target ABS
may start transmitting data on such activated secondary carrier(s) if the AMS sends AAI_CM-IND message to
the target ABS after network reentry. Before secondary carrier pre-assignment, the serving ABS shall forward
the multicarrier capability of the AMS to the target ABS(s) via backbone. If the AAI_MC-REQ/RSP message
exchange indicator is set to ‘1’ in AAI_HO-CMD message, the AMS shall transmit AAI_MC-REQ containing
its updated MC capability to the target ABS after MCHO with secondary carrier pre-assignment. The updated
MC capability of the AMS shall be determined on the basis of the MC configuration supported by the target
3
Wait for
BR opportunity
IEEE C802.16m-10/0492
ABS, which is indicated by the AAI_NBR-ADV message. The target ABS may transmit the AAI_MC-RSP
message to update the assigned secondary carrier based on the updated MC capability of the AMS.
--------------------------------------------------------------------End of the Text-------------------------------------------------------------------------
4