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Dear Hyunjeong and all, Thank you for your comments. I think M2M multicast group will be
configured based on an M2M subscriber or the subscriber’s service. In this case if the M2M
multicast group ID is unique at the domain of network, it’s likely that the number of ID
should be very large because there will be many M2M subscribers in a network .Furthermore,
M2M devices belonging to some M2M subscribers will mainly be in a geographical
region. Please refer to the comment #5 of below my e-mail. Due to these reasons I think it’s efficient that the M2M
multicast group ID is unique in a geographical region. In this case I suppose a
paging group as the geographical region for managing the M2M multicast group IDs.
This does not mean that PGID is used as multicast group ID. However, I think if the number/size of multicast
group ID is enough to manage all M2M multicast groups in a network, it will be
efficient that the M2M multicast group ID is unique in an entire network in
order to reduce the unnecessary overhead that an device performs the multicast
ID update procedure when the device moves to the different zone/region. Actually
it was my original proposal (C80216p-10_0019). Thanks, Jeongki From:
Hyunjeong Kang [mailto:hyunjeong.kang@samsung.com] Dear Jeongki and all, Thank you for your good summary. I have a question about the concept in contribution #21/15. Do you propose to use PGID as multicast group ID or vice versa?
As you mentioned paging group is designed based on geographical
region by grouping base station(s) and it is a reason to avoid frequent idle
mode handover by an idle mode MS. But about multicast group ID, I think it is an identification
for multicast service. So, I wonder what the contribution #21/15 propose. Regards, Hyunjeong From:
Jeongki Kim [mailto:jeongki.kim@LGE.COM] Dear Kaushik and all, Based on the 1st DEV
CC and the related contributions my understanding about the group ID is as
follows 1. Name: M2M
multicast group ID (C80216p-rg-11_0006), M2M devices group ID (0012), M2M Group
paging ID (0021) 2. What?
Identify a M2M subscriber group (or M2M multicast group) which one or more M2M
devices belongs to 3. The main
usages
1) To transmit the multicast data in an M2M subscriber group (or M2M multicast
group)
- Group ID is included in multicat MAP or Group ID is masked with the CRC of
multicast MAP
2) To wake up all devices in idle state in M2M subscriber (or multicast group)
- Group ID is included
in the paging message
* Applications? M2M multicast data which need to be transmitted to all devices
belonging to a group simultaneously (e.g., software update, application
multicast management, etc.) 4. What's the
difference between group ID for M2M and 16m Multicast group ID ?
1) Multicast group ID of 16m
- Main purpose/applications: Cell multicasting at disaster/emergency events
- i.e.) Cell specific: When the cell is changed, Multicast ID should be
updated
- Used by AMSs in only connected mode
2) Group ID for M2M multicast
- Network common (0006, 0012) or geographical group common[Paging
group/multicast Zone] (0021)
- Used by M2M devices in connected mode &
idle mode 3) Group ID for 16m
GRA
- ID to manage the AMSs in connected mode
in order to increase the resource efficiency (i.e., DL control overhead
reduction)
- For not multicast service but unicast
service Therefore I
agree that the group id for M2M needs to be defined newly for M2M multicast
transmission 5. Size of Group ID I assume the M2M
multicast group is configured based on a M2M subscriber and an M2M subscriber
may have one or more multicast connections. According to 16p TR
(80216p-10_0005), there are several M2M applications such as Secured Access
& Surveillance, Tracking, Tracing, and Recovery, Public Safety, Payment,
Metering, etc. There will also be a lot of subscribers per each application.
For example, in a country there are many taxicab companies, bus (including
intercity bus & intra-city bus, etc.) companies, rent-car companies, etc. And most of subscribers for some M2M applications
(e.g., companies for gas metering, intercity bus/taxi companies) exist in a
geographical region. This is why I consider
the group ID as geographical-region (paging group) common ID instead of network
common ID. I think if the group
ID is unique in the entire network, the size of group ID should be very long
(??). Based on three
contributions (0006, 0012, 0021(0015)) the summary of group ID is as follows: * Common points: 1. Need new Group
ID for M2M multicast (M2M Group ID) 2. The M2M Group
ID is also retained in idle mode. 3. Usage: 1)
group paging
2) Multicast transmission * Further discussion
points: 1. Shared region
& size of M2M Group ID -
Option 1: Unique in the entire network (0006, 0012) -
Option 2: Unique in the geographical region (0015) 2. M2M group ID
allocation -
Option 1: By DSA procedure (006) -
Option 2: During initial network entry (0012, 0015) It would be
appreciated if you give me any comments. If I’m missing something, please
let me know. Thanks, Jeongki From:
Jang, Jaehyuk [mailto:jack.jang@SAMSUNG.COM] Dear Bin, Kaushik, Soojung, and All, Thanks for sharing your opinions. BTW, 802.16m draft already defines several IDs (e.g.,
DID (used in idle mode operation), CRID) which are not limited in a cell only.
And, to support large number of devices for m2m application, it is inevitable
to utilize idle mode operation (for power saving). Then, 802.16p needs to
define network-level broadcast/multicast mechanism so that data transmission to
MSs in idle mode is possible. Otherwise, thousands of MSs will perform network
reentry to receive broadcast/multicast data. Hence, it is appropriate to define
a new ID such as MGID for the operation, IMO. Regards, Jack From:
Bin Chen [mailto:binchen@HUAWEI.COM] Hi, Kaushik,
Soojung, and all, Thanks for sharing
these. I think it is not
suitable to allocate a group ID in MAC with network unique feature. MAC layer is limited
in cell level, and if a MS move to other cells there is handover procedure to
re-allocate a new ID. In a cell level,
there is broadcast and multicast process and group resource allocation already. So, I would prefer
to discuss it more sufficient in the group before we put it to the AWD text. BR/Bin From:
Kaushik Josiam [mailto:kjosiam@STA.SAMSUNG.COM] Thanks
Soojung for sharing your opinion on the need for a group ID. I request
other members to input their comments on this issue. Dear
16p members, Since
we didn’t hear any objections from members for having a group ID in the
conference call, would it be reasonable for us to add the following text to the
addressing section 16.2.1.2.9 M2M device Group
Identifier (MGID)
A [TBD] bit value that is used to identify
an M2M group which an M2M device belong to. It is unique in the domain of the
entire network. A MGID is assigned by the network during initial network entry. What
we are proposing to do is to create a new subsection for group identifier and
add this description there. We welcome member’s comments on the text
above. You can add your comments to the text as a reponse to this email.
If you are opposed to creating a group ID, please don’t hesitate to state your
objection. Regards Kaushik
& Ming-Hung Dev
RG Chairs From:
Dear 16p members, ETRI's opinion about
group ID is as follows; M2M devices for the
same service application (e.g. metering, tracking ) can share one or more
features in common. In other words, due to the nature of M2M application, the
M2M device within the same service application may have the same traffic
pattern. In order to provide the same service application, the same
control messages or the data traffic may be required for the M2M devices
at the same time. In this case, individual transmission of the same data to
mass M2M devices can cause huge overhead. By grouping the M2M devices that have
same features, the 16p system can support efficient management. And the group
control(e.g. group paging) and traffic (e.g. multicast transmission) may
be needed to M2M devices in idle state as well as in connected state.
therefore. We think that a group ID is necessary. And a group ID is network
specific ID and is associated with subscriber. A network
specific group ID which is associated with subscriber has benefits as following
. Regards, Soojung jung --------------------------------------------------- Soojung Jung Senior Member Mobile Telecommunications Research Division Electronics and Telecommunications Research
Institute(ETRI) Tel: +82-42-860-5928 Fax:
+82-42-861-1966 ---------------------------------------------------
Dear 16p members, Two contributions C0006 and C0012 defined the concept of a
group ID addressing different applications. Please respond to this email thread
to voice your thoughts. In particular, we are looking for your inputs on
the following: 1. Is a Group ID necessary to be defined for
M2M devices? 2. What applications would use a group ID? 3. What are the characteristics of a group
ID? (For ex: is it a network specific ID?) 4. What is the size of the proposed group ID? If you have any other thoughts, proposals or questions, please
respond to this thread. Regards Kaushik & Ming-Hung DEV RG Chairs |