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Hi
All,
Apology if you receive multiple copy of this email. I'm re-sending using 802.16 email reflector. Please
let me initiate the discussion for Path management topic. We have total 6
contributions (In ascending order) as follow (Each contribution was assigned
with specific color) 1.
C802.16n-rg-11/0027 2.
C802.16n-11/0028r3 3.
C802.16n-rg-11/0029 4.
C802.16n-rg-11/0036 5.
C802.16n-rg-11/0039r1 6.
C802.16n-11/0050r3 From
these 6 contributions, I had consolidated the table of content and combined
contributions together under the table of content as
below. 17.2.7
Path Discovery and Management
(C802.16n-rg-11/0027,C802.16n-rg-11/0036) 17.2.7.1
Alternative Path Definition (C802.16n-rg-11/0039r1) 17.2.7.2
Alternative Path Establishment Algorithm in a tree topology
(C802.16n-rg-11/0029) 17.2.7.3
Alternative Path Establishment (C802.16n-11/0050r3,
C802.16n-rg-11/0029) 17.2.7.4
Alternative Path Establishment with Multi-mode (C802.16n-rg-11/0039r1) 17.2.7.5
Alternative Path Maintenance at FS (C802.16n-rg-11/0039r1,
C802.16n-11/0028r3) 17.2.7.6
Maintenance of Alternative Path(C802.16n-11/0050r3,
C802.16n-rg-11/0029) 17.2.7.7
Handover to Alternative Path(C802.16n-rg-11/0029) 17.2.7.8
Failure Detection(C802.16n-11/0050r3) 17.2.7.9
Fast network re-entry after SPOF(C802.16n-11/0050r3,C802.16n-11/0028r3) Sessions
17.2.7, 17.2.7.3, 17.2.7.5, 17.2.7.6, 17.2.7.9 have two contributions each and
may have conflicts. I
would like to initiate one point of conflict between contribution 0029 and
others: -
Contribution
0029 state that alternative path could be decided by BS or MS. Other
contributions mainly state that alternative path should be decided by BS
only. Please
have a view on this. With
my best regards, Hoang PS:
Below is the consolidated documents. Please note that text with same color comes
from same contribution. ***** BEGIN: PATH MNG ***** 17.2.7
Path Discovery and Management [Begin of Text Proposal: From
C802.16n-rg-11/0027] [HR-Network
shall support neighbor and path discovery between HR-MSs as well as between
HR-MS and HR-Network infrastructure stations. Path
discovery can be accomplished with or without network
support. HR-Network
shall support path management and establishment, removal ,updating of
alternative paths to support fast neighbor and path recovery in the event of
disruption; for example, encountering
intermediate HR-MS failure or movement. HR-Network shall provide the capability
to choose the most reliable or the least latency path. The
path information could be included and passed in the
signaling.] [End of Text Proposal: From C802.16n-rg-11/0027] [Begin of Text Proposal: From
C802.16n-rg-11/0036] [An
HR-BS changing its role as HR-RS may select alternative path for subordinate
HR-MS in the event of disruption. The HR-BS transmits MAC context information of
the HR-MS during establishing relay link to neighbor HR-BS to allow HR-MS to
select alternative path during performing handover to the neighbor
HR-BS. The
HR-BS may store MAC context information of the HR-MS to allow HR-MS to reselect
reliable path after performing network reentry when returning back to the HR-BS
upon its recovery. When
an HR-MS changes its role as RS or returns to HR-MS from RS mode, alternative
path may be selected for subordinate HR-MS. The superordinate HR-BS may transmit
MAC context information of the subordinate HR-MS after establishing relay link
to allow the HR-MS to select alternative path.] [End of Text Proposal: From C802.16n-rg-11/0036] 17.2.7.1
Alternative Path Definition [Begin
of Text Proposal: From C802.16n-rg-11/0039r1] An
alternative path is a link or a list of continuous links (through HR-RS or
HR-MSs) between a HR-MS and the HR-network. There are no active connections on
alternative paths in normal operation. The alternative path will only be
activated when a single point of failure is detected. 17.2.7.2
Alternative Path Establishment Algorithm in a tree
topology [Begin of Text Proposal: From
C802.16n-rg-11/0029] In
a tree topology, A backup tree could be calculated as
follow:
17.2.7.3
Alternative Path Establishment [Begin
of Text Proposal: From C802.16n-11/0050r3] [The
alternative path shall be determined by the serving HR-BS. The decision shall be
based on the measurement report on the links among the
stations.] [End of Text Proposal: From C802.16n-11/0050r3] [Begin of Text Proposal: From
C802.16n-rg-11/0029] HR-BS
determines the tree topology of the network. From this tree topology, backup
path for HR-MS will be determined according to session 17.2.7.2.
HR-BS will have higher priority in backup path calculation.
17.2.7.4
Alternative Path Establishment with Multi-mode [Begin of Text Proposal: From
C802.16n-rg-11/0039r1] The
super-ordinate HR-BS shall determine alternative paths for every subordinate
stations to prepare in advance for SPOF events. The stations along an
alternative path shall include HR-MS or HR-BS that changes mode to relay or
base-station modes if the alternative path is a better path (e.g. more reliable)
than others. 17.2.7.5
Alternative Path Maintenance at FS [Begin of Text Proposal: From
C802.16n-rg-11/0039r1] HR-BS
shall maintain alternative paths of its subordinate stations. It shall update
the stations with the alternative path information and network information to
facilitate fast network re-entry for those paths. It shall inform HR-MS which
changes mode (to HR-RS or HR-BS) of its subordinate HR-MSs and network
information to facilitate fast network re-entry of those
HR-MSs.] [End of Text Proposal: From C802.16n-rg-11/0039r1] [Begin of Text Proposal: From
C802.16n-11/0028r3] The
serving HR-BS shall maintain alternative paths of its subordinate stations
through FSs. It shall periodically update FSs with a TBD message containing a
list of SS it is responsible for network re-entry after SPOF, and configuration
information to facilitate fast network re-entry. The serving HR-BS shall
periodically update its SSs with a TBD message containing their respective FS
and configuration information to facilitate fast network re-entry to that
FS.] [End of Text Proposal: From C802.16n-11/0028r3] 17.2.7.6
Maintenance of Alternative Path [Begin of Text Proposal: From
C802.16n-11/0050r3] HR-BS
and HR-MS shall store the information of alternative path as the backup in the
event of failure of intermediate station. The information of alternative path is
TBD. The
HR-MS and the access station of the alternative path shall store pre-negotiated
information for fast network re-entry after SPOF.] [End of Text Proposal: From C802.16n-11/0050r3] [Begin of Text Proposal: From
C802.16n-rg-11/0029] When
the topology is changed, backup path should be recalculated to maintain its up
to date status and efficiency. Both HR-BS and HR-MS can decide HR-MS?s current
backup path is still relevant or not. If it?s not, HR-BS or HR-MS shall
construct a new backup path according to session 17.2.7.2.
17.2.7.7
Handover to Alternative Path [Begin of Text Proposal: From
C802.16n-rg-11/0029] When
HR-MS?s timeout with its current superordinate node exceed the TIME_OUT
threshold, it shall inform HR-BS of this disruption through DSD-REQ message.
This DSD-REQ message is sent through the backup path. This message also serves
as the trigger for nodes in backup path. Intermediate nodes on the backup path
will then mark the corresponding backup entry in their routing table as
currently active and shall use this entry to relay data from/to
HR-BS. The
intermediate nodes in the backup path should reply the DSD-REQ received from its
subordinate node with DSD-RSP message to confirm that switching to backup path
has been carried out. After receiving DSD-RSP message from its superordinate,
HR-MS shall transmit data to HR-BS through the backup path
normally. Once
HR-BS receives the DSD-REQ from HR-MS, it shall refresh its topology information
and inform affected HR-MS about the new topology changes.] [End of Text Proposal: From
C802.16n-rg-11/0029] 17.2.7.8
Failure Detection [Begin of Text Proposal: From
C802.16n-11/0050r3] The
failure detection can be performed by the stations around the point of failure
and the reports from the stations around the point of failure may be used for
HR-BS?s decision to establish the path using alternative path information. The
detection procedure and reporting messages is TBD.
17.2.7.9
Fast network re-entry after SPOF [Begin of Text Proposal: From
C802.16n-11/0050r3] Optimized
network re-entry shall be used for accelerating path recovery. Pre-allocated
ranging codes shall be used to achieve contention-free ranging at network
re-entry. The details are TBD. The
path recovery could be either initiated by the serving HR-BS or the HR-MS lost
of the connection with HR-network. When the HR-BS initiate the path recovery, it
sends out the control messages to establish the path for the HR-MS lost of the
connection with HR-network, and the access station along the alternative path
prepares for the network re-entry for this HR-MS.] [End of Text Proposal: From
C802.16n-11/0050r3] [Begin of Text Proposal: From
C802.16n-11/0028r3] Upon
detection of a failure at the serving BS, FSs shall switch mode and perform
network entry using the most recent configuration information. It shall
facilitate fast network re-entry for SSs obtained from the most recent
configuration information.] [End of Text Proposal: From C802.16n-11/0028r3] ***** END: PATH MNG ***** |