network entry procedure with multi-carrier support document number: ieee c802.16m-09/0966 date...
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Network Entry Procedure with Multi-Carrier SupportNetwork 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 Email: [email protected] MediaTek Inc.
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
Notice: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.
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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. Multi-Carrier MS follow a common network entry procedure as the single-carrier MS
2. Multi-Carrier BS broadcast the cell bar bit in each carrier the same as single carrier mode
3. Multi-Carrier MS select the candidate primary carrier based on cell bar bit
4. MS and BS exchange their multi-carrier capabilities during network entry
5. Perform DL Sync. & Ranging again right after completing the common network entry procedure
Scan for DL available carriers
DL Sync. with a candidate carrier
established
BS assigned carrier > 1?
Establish provisioned connections
DL Sync. & Ranging
BS inform PHY parameters of
assigned carriers
Operational
Yes
No
Common Procedure for Single-/Multi-Carrier MSs
Extended Procedure for Multi-Carrier MSs
Allow Network Entry in candidate carrier?
Yes
No
Obtain the UL parameters of the primary carrier
Ranging in the primary carrier
Negotiate basic and multi-carrier capabilities
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 multi-carrier 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– Based on current idea agreed in SDD (19.4.3)
2. P802.16m AWD needs to keep single bit indication in SFH of each carrier to help network entry– 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
3. 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.
Text Proposal
• [Add the text and figure in this page into P802.16m AWD]
Scan for DL control channel of
each carrier
DLsynch. with a
candidate established
ObtainUL parameters of the
primary carrier
ULParameters
acquired
Ranging & automatic adjustments in the
primary carrier
Ranging & auto-matic adjust-
ments complete
Negotiate basic capabilities
Basic capabilitiesnegotiated
SS authenticationand
key exchange
SSauthentication
complete
Registerwith
ABS and negotiate multi-carrier capabilities
Registration and multi-carrier capabilities negotiation complete
Establish IP connectivity
IPcomplete
Establish time of day
Time of day established
Transfer operational parameters
Transfer complete
Establishprovisioned connections
Operational
Allow NW entry in candidate carrier?
Yes
NO
Enable multi-carrier operation?
Yes
BS informs PHY parameters of
secondary carriers
Ranging in secondary carriers if necessary
NO
Figure xx1 – AMS initialization overview