Comments on aGPS section in QoS DG AWD (09_0846)
Document Number: IEEE C802.16m-09/1147
Date Submitted: 2009-05-03
Source:
Jeongki Kim, E-mail: chegal@lge.com
, ksryu@lge.com
, ronnykim@lge.com
Kiseon Ryu,
Ronny Yongho Kim
LG Electronics
Re:
IEEE 802.16m-09/0020, “Call for Contributions on Project 802.16m Amendment Working Document (AWD) Content”.
Category: AWD – DG Comment / Area: Connection Management/QoS DG
Purpose:
To be discussed and adopted in 802.16m AWD
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• Voice codec such as G. 723, G. 729, AMR use silence suppression mechanism to reduce bandwidth consumption during silence period.
– SID frame may be transmitted periodically or non-periodically
• For AMR, SID frame is transmitted periodically
• For G.723.1, SID frame is transmitted whenever needed
• When silence period starts for UL, MS signals to BS the indication of
SF set switching from 1 to 2. BS then allocates bandwidth according to the traffic characteristics of the SID frame.
– For codec with periodical SID, BS allocates X bytes periodically for MS to transmit SID frame.
– For codec with non-periodical SID, MS signals request for sending
SID frame using contention based or non-contention based resource, and BS allocates X bytes once upon receiving the request.
• In ErtPS, an AMS may send the CQICH codeword to inform the
BS of its having the data to send

• For codec with non-periodical SID, the secondary GPI will not be defined.
• In case of using only one CQICH codeword for aGPS (like ertPS)
– When AMS has SID packet to send during silence period, AMS will send a CQICH codeword to inform ABS of it and ABS will switch the
QoS parameters to primary QoS parameters
• Increasing wasted resource
Wasted resource
Primary GPI
Active (Talk spurt)
……
Non-periodic
Inactive (silence period)
Active (Talk spurt)
GMH
Or CH
GMSH VoIP packet SID BR header
CQICH
Codeword
Wasted resource
*GMH: Generic MAC header, CH: compact header, GMSH: Grant Management subheader, BR: Bandwidth request,
GPI: Grant and polling interval

– AMS may send the primary aGPS CQICH codeword when the
AMS has the data which the primary QoS parameters
(GPI_primary and GrantSize_primary) are used to transmit
– If the ABS receives the primary CQICH codeword, the ABS shall switch the current QoS parameter set to primary QoS parameter set and allocate the UL grant corresponding to the
GrantSize_primary.
– AMS may send the secondary aGPS CQICH codeword when the
AMS has the data which the GrantSize_secondary is used to transmit
– If the ABS receives the secondary aGPS CQICH codeword, the
ABS shall allocate the UL grant corresponding to the
GrantSize_secondary.

• QoS parameters for aGPS
– GPI_primary: 20ms
– GPI_secondary: Not defined
– GrantSize_primary: VoIP packet
– GrantSize_secondary: SID packet
•
If SID packet is generated during silence period, the AMS may transmit the secondary aGPS CQICH codeword to inform ABS of it.
• If VoIP packet is generated during silence period, the AMS may transmit the primary aGPS CQICH codeword to inform ABS of it
• During silence period, upon receiving the secondary aGPS CQICH codeword, the ABS will allocate the resource to
AMS based on only GrantSize_secondary
• When ABS receives the primary CQICH codeword, the ABS switches the current QoS parameter set into primary
QoS parameter set and allocates the resource to AMS based on GPI_primary and GrantSize_primary
20 ms
Active (Talk spurt)
……
Non-periodic
Inactive (silence period)
Active (Talk spurt)
GMH
Or CH
GMSH VoIP packet SID BR header
Secondary
CQICH
Code word
Primary
CQICH
Code word
*GMH: Generic MAC header, CH: compact header, GMSH: Grant Management subheader, BR: Bandwidth request,
GPI: Grant and polling interval
Wasted resource

• 15.2.z.3.1 Adaptive granting and polling service
[Insert the following text at the end of the section.]
When an AMS has the data which the primary QoS parameter set (GPI_primary and
GrantSize_primary) is used to transmit, the AMS may send the primary aGPS CQICH codeword to inform ABS of it. If the ABS receives the primary aGPS CQICH codeword, the ABS shall switch the current QoS parameter set to primary QoS parameter set and allocate the UL grant corresponding to the
GrantSize_primary. When an AMS has the data which the secondary QoS parameter set
(GrantSize_secondary) is used to transmit, the AMS may send the secondary aGPS CQICH codeword to inform ABS of it. If the ABS receives the secondary aGPS CQICH codeword, the ABS shall allocate the UL grant corresponding to the GrantSize_secondary.