[STDS-802-16] [802.16n] [MM] Proposed harmonized text for path management topic

[Hoang Vinh Dien <hvdien@NICT.COM.SG>]

Dear All,

 

Please find the proposed harmonized text for path management below. Any comments is welcome.

 

Thanks and regards,

Hoang Vinh Dien

 

 

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17.2.7 Path Discovery and Management

 

17.2.7.1 Alternative Path Definition

An alternative path is used for fast network recovery to a HR-MS in the event of disruption, e.g. when the serving HR-RS or HR-BS fails. In normal operation, there are no active connections on any alternative path. The alternative path will only be activated when a single point of failure is detected.

 

An alternative path is a link or a list of continuous links between an HR-MS and the serving HR-BS, or an alternative HR-BS. The intermediate stations are HR-MS, HR-RS, or stations which can change its mode to an infrastructure station.

 

17.2.7.2 Alternative Path Management

 

Alternative path management consists of its establishment and maintenance, and the signaling for fast network recovery when switching to the alternative path.

 

The stations involved in the alternative path management are the HR-MS, its access station and serving HR-BS, an alternative access station and an alternative HR-BS.

 

17.2.7.2.1 Alternative Path Establishment

?      Serving HR-BS

?     Choose an alternative path including mode change for every HR-MS

?     The algorithm and criteria for choosing the alternative path: TBD

?     Store alternative path information

?     Inform HR-MS of the path and path information

?      Access Station of HR-MS

?     TBD

?      HR-MS

?     Store Alternative Access Station

?     Store fast network re-entry information

?      Alternative HR-BS (may be different from serving HR-BS)

?     Store alternative path information

?     Store HR-MS information

?      Alternative Access Station

?     Store HR-MS information

17.2.7.2.2 Maintenance of Alternative Path

?       Serving HR-BS

?     Whenever an alternative path is invalid or better alternative path is available

?     Update alternative path information for all HR-MS

?     Inform HR-MS of the path and path information

?      Access Station of HR-MS

?     TBD

?      HR-MS

?     Monitor alternative access link

?     Inform serving HR-BS  if alternative access link is unavailable

?      Alternative HR-BS (may be different from serving HR-BS)

?     TBD

?      Alternative Access Station

?     Remove when alternative path is not needed

17.2.7.2.3 Failure Detection

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.

17.2.7.3 Switching to Alternative Path after SPOF

?      HR-MS

?     Perform fast network re-entry to alternative access station using stored information

?     Inform serving HR-BS

?      Alternative HR-BS (may be different from serving HR-BS)

?     Allow network re-entry

?      Alternative Access Station

?     Allow network re-entry

 

17.2.7.4 Path Management [when HR-BS and HR-MS change role], [With HR-BS and HR-MS multi-mode] 

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 may switch to the alternative path.

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.

 

 

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