Transcript Network Entry Procedure with Multi-Carrier Support

Network Entry Procedure with Multi-Carrier Support
Document Number: IEEE C802.16m-09/0966
Date Submitted: 2009/04/27
Source:
I-Kang Fu, Yih-Shen Chen, Kelvin Chou, Pei-Kai Liao, Paul Cheng
MediaTek Inc.
Email: [email protected]
Venue: IEEE 802.16 Session#61 at Cairo, Egypt.
Base Contributions: This is base contribution
Re: IEEE 802.16m-09/0020, “Call for Contributions on Project 802.16m Amendment Working Document (AWD) Content”
– AWD New Contribution for Multi-Carrier
Purpose: For TGm member discussion and adoption
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General Network Entry Procedure for Multi-Carrier MS
• General network entry / initialization procedure for multi-carrier MS
based on SDD 19.4.3
General ideas:
1.
2.
3.
4.
5.
Common Procedure for
Single-/Multi-Carrier MSs
Scan for DL
available carriers
Multi-Carrier MS follow a
common network entry procedure
as the single-carrier MS
Multi-Carrier BS broadcast the cell
bar bit in each carrier the same as
single carrier mode
Multi-Carrier MS select the
candidate primary carrier based on
cell bar bit
MS and BS exchange their multicarrier capabilities during network
entry
Perform DL Sync. & Ranging
again right after completing the
common network entry procedure
Extended Procedure for
Multi-Carrier MSs
DL Sync. with a
candidate carrier
established
No
Allow Network Entry in
candidate carrier?
Establish
provisioned
connections
BS assigned
carrier > 1?
No
Yes
Yes
Obtain the UL
parameters of the
primary carrier
Ranging in the
primary carrier
BS inform PHY
parameters of
assigned carriers
DL Sync. &
Ranging
Negotiate basic and
multi-carrier
capabilities
Operational
An example to explain general idea (for information)
Discussion Issue#1
• When initialization, multi-carrier MS may randomly select one of the fully
configured carriers as its candidate primary carrier. It can save much
overhead if BS can broadcast which carrier is allowed for network entry.
–
–
–
–
The basic motivation is for load balancing and prevent unnecessary carrier change
This can largely speed up MS scanning and network access
Current IEEE 802.16 Rev2 standard already broadcasts 8 bits load information
Suggest 802.16m AWD include single bit indication in SFH for the same purpose
Discussion Issue#2
•
After common network entry procedure completed through primary carrier,
multi-carrier MS has to performance DL sync & Ranging again before enabling
multi-carrier transmission.
1. Consider the example as shown in following, where the multi-carrier MS can
support 2 carriers and multi-carrier BS can support 4 carriers.
–
When initial scanning, MS need to scan for the DL A-Preamble transmitted from BS
by adjusting the center frequency of its receiver.
Discussion Issue#2
2.
After the symbol detection and fully configured carrier confirmation, the multicarrier MS may then perform network entry through that carrier.
–
The center frequency of multi-carrier MS receiver will be the same as the
primary carrier because of the time domain symbol detection operation
Discussion Issue#2
3.
After completing the common network entry procedure, the multi-carrier MS have to
perform DL sync. & Ranging again before activating secondary carrier.
–
Because the center frequency of multi-carrier MS transceiver need to be adjusted again so that
its BW can cover the radio signals transmitted through both carrier#1 and #2.
– After completing the common entry procedure, the MS transceiver BS only cover part of the
carrier#2.
–
It is recommended to do this DL sync. & Ranging right after the common network entry
procedure (e.g. after determining the assigned carrier).
– Otherwise the MS will need to do this adjustment before activating the assigned carrier and will
then disturb the ongoing data transmission in primary carrier. This is really unnecessary.
Summary
1.
P802.16m AWD needs to define a common network entry procedure for all
MS and an extended procedure only for multi-carrier MS
–
2.
P802.16m AWD needs to keep single bit indication in SFH of each carrier to
help network entry
–
–
–
3.
Based on current idea agreed in SDD (19.4.3)
Align with the idea in current Rev2 standard design
Single bit will be enough
Multi-Carrier should select its primary carrier based on this indication
Network entry procedure in P802.16m AWD needs to allow DL sync. &
Ranging after assigning secondary carriers to MS
–
–
–
Align with SDD (r8) description in line#4, page#160.
Negotiate some time for multi-carrier MS configure its hardware according to the
secondary carriers assigned by BS
This action shall be performed before the end of network entry stage rather than right
before activating secondary carrier
•
Time reservation for hardware reconfiguration will still be necessary. If not, it will disturb
data transmission in primary carrier.
Scan for
DL control channel of
each carrier
Text Proposal
DL
synch. with a
candidate
established
SS authentication
and
key exchange
Allow NW entry in
candidate carrier?
SS
authentication
complete
NO
•
[Add the text and figure in this page
into P802.16m AWD]
Transfer operational
parameters
Yes
Obtain
UL parameters of the
primary carrier
UL
Parameters
acquired
Ranging & automatic
adjustments in the
primary carrier
Register
with
ABS and negotiate
multi-carrier
capabilities
Registration and
multi-carrier
capabilities
negotiation
complete
Establish IP
connectivity
Transfer
complete
Establish
provisioned
connections
Enable multi-carrier
operation?
Yes
Ranging & automatic adjustments complete
IP
complete
BS informs PHY
parameters of
secondary carriers
NO
Negotiate
basic capabilities
Establish time of day
Ranging in secondary
carriers if necessary
Basic capabilities
negotiated
Time of day
established
Operational
Figure xx1 – AMS initialization overview