C80216m-09_0111
Project
Title
IEEE 802.16 Broadband Wireless Access Working Group < http://ieee802.org/16 >
Clarification on the Processing of Secondary Carriers in Multicarrier Mode
Date
Submitted
January 5, 2009
Source(s)
Re:
Kamran Etemad (kamran.etemad@intel.com)
Intel Corporation
Call for Contributions on Project 802.16m System Description Document (SDD)
Abstract Stage 2 proposes text to complement existing SDD text draft
Purpose
Notice
Release
Patent
Policy
Discussion and Approval
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Kamran Etemad
Intel Corporation
The current SDD draft defines multicarrier operation between fully configured carriers and partially configured carriers. However some clarification is needed to show when MS should start and stop MC mode and when start or stop processing secondary carrier.
The following proposed text suggests some such clarifications without adding new concepts. To explain the process additional terms such as available, candidate and active carriers are introduced to help with the clarifications.
---------------------------------------------------------Start of the Text--------------------------------------
[Make the following clarifications in relevant sections of SDD.]
….
19.4.7 Carrier Management
The following steps summarizes the high level sequence of procedures involved in the MC operation:
1.
ABS periodically broadcasts its MC mode support and MC channel configuration

The carriers listed in the MC configuration message are called Available Carrier . Not all available carriers can be assigned to a user but all available carriers are introduced to MS’s along with their respective logical carrier index.

The logical carrier indices are used to refer to such carriers in all MC allocations messages as needed.
2.
AMS’s Initialization and network entry is performed same as SC mode
3.
AMS and ABS perform detailed MC Capability negotiation: Capabilities includes:

Carrier Switching Only
 Capability to concurrently receive and aggregate MC’s and Max No. of Carriers
 Capability to concurrently aggregate and transmit on MC’s, Max No. of Carriers
Note the AMS’s MC capability may be different for TX and RX.

Capability to support Aggregation across Non-contiguous Spectrum, Max RF distance between carriers. This is in addition to AMS’s support for multiple band classes.
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4.
If requested by AMS the ABS may also send the MC configuration to the AMS in unicast using DSx or similar messaging. The MS may not request this information if AMS has already received it through broadcast configuration messages.
5.
AMS performs BW request including its required QoS (Same as Single Carrier)
6.
Based on AMS capabilities and QoS requirement and other factors, the scheduler may decide on need for MC allocations. Note that not all allocation to a MC capable MS involves multiple carriers; rather MC allocations may only be used if required by QoS or loading consideration and may be terminated once SC mode becomes feasible or preferable to meet the QoS.
7.
For DL MC Allocations only: ABS commands AMS to start measuring (PHY) and sending
CQI on one or more specific Secondary Carriers, called Candidate Carriers. Such measurements may be sent on Primary carrier only.
8.
ABS selects and designates one or more secondary carriers as Active Secondary” Carriers for MC aggregation or switching allocations.
9.
For Aggregation there are multiple cases:

Aggregation across all fully configured active carriers.

Aggregation involving at least one partially configured active carrier
10.
For switching there are multiple cases:

Switching between two fully configured active carriers, which will result in primary carrier switching.

Switching to a partially configured active carrier will be used for E-MBS traffic.
Partially configured carriers are only defined as DL only carriers optimized for E-MBS.
The use of the same DL only carrier for large unicast packet downloads is FFS.
11.
The AMS performs basic PHY processing and reports CQI measurements for candidate secondary carriers and until reception on such carriers is disabled as described in power management section.
12.
In addition to basic PHY processing the AMS may be directed to start and stop the MAC processing on secondary carriers through signaling on the Primary carrier the details are
TBD.
13.
Regardless of AMS’s MC capabilities the default mode of operation is the SC mode and therefore upon entering the idle and after every network entry or re -entry the the AMS follows SC mode of operation.
The ABS may instruct the AMS, through control signaling on the current primary carrier, to switch its primary carrier to one of the available fully configured carriers within the same ABS for load balancing purpose, carriers’ varying channel quality or other reasons. AMS switches to the target fully configured carrier at action time specified by the ABS. The carrier switch may also be requested by the AMS through control signaling on the current primary carrier. Given that a common MAC manages both serving and target primary carriers, network re-entry
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procedures at the target primary carrier is not required. ABS may direct an AMS to perform the primary carrier switching without scanning.
ABS may also assign different secondary carriers to the AMS, through control signaling on the current primary carrier. The ABS may instruct AMS to perform scanning on other carriers which are not serving the AMS. In this case, if the target carrier is not currently serving the AMS, the
AMS may perform synchronization with the target carrier if required.
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