| Thread Links | Date Links | ||||
|---|---|---|---|---|---|
| Thread Prev | Thread Next | Thread Index | Date Prev | Date Next | Date Index |
|
This is the mechanism I originally envisioned when
devising HO methodology language and structure in the document. Supporting
this mechanism would be much easier than re-writing the document to support a
macrodiversity/synchronized transmission Soft HO mechanism. But we should
be aware that any macrodiversity benefit will be lost using this
mechanism.
On a related note, this is what I was talking about
when discussing differentiating concept ('Soft Handoff') from the specific
mechanism used to achieve that concept or enhance reliability (pre-HO context
transfer, fast-switching, macrodiversity, etc...). The EVDO mechanism is
referred to as 'Virtual Soft Handoff' yet has no element of macrodiversity--the
primary criteria cited by the group on the June 3 conference call as defining
'Soft Handoff' (by the way, we should be using 'handover' here, not
'handoff').
I once again reiterate these
definitions:
Hard-handover: a handover occuring without transfer
of MSS service and operating context prior to MSS network re-entry at the new
attachment point
Soft-handover: a handover occuring with transfer of
MSS service and operating context prior to network re-entry at the new
attachment point such that the MSS enjoys persistent context and
continuity of service across handover
Soft-handover with macrodiversity: a handover
occuring with transfer of MSS service and operating context prior to MSS network
re-entry at the new attachment point, with two or more BS providing synchronized
transmission of MSS downlink data during the handover interval, such that the
MSS enjoys persistent context and continuity of service across
handover
Thanks,
Phil
|