|
IEEE 802.16-2004, 6.3.14.2 Service flows, page 220,
line 8 says 'a service flow is a MAC transport service that provides
unidirectional transport of packets either to uplink packets transmitted by the
SS or to downlink packets transmitted by the BS....' and line 18 says 'An SFID
is assigned to each existing service flow. The SFID serves as the principal
identifier for the service flow in the network. A service flow has at least an
SFID and an associated Direction.' So neither of these sentences say that
the SFID must be unique and cannot be common between multiple service flows,
though the language does indicate that the SFID must be to either a UL or DL
service flow, not both. However, section 3. Definitions, page 10, line 52, '3.52
service flow identifier (SFID): A 32 bit quantity that uniquely identifies a
service flow to both the subscriber station and base station (BS)...' is very
specific and requires that the SFID be unique for that specific service flow. So
the answer to your question is, NO, the SFID cannot be used for
both the DL and UL of some similar service flows, though they may share the same
CID.
Thanks,
Phil
----- Original Message -----
Sent: Sunday, September 05, 2004 6:53
AM
Subject: Re: [STDS-802-16] T16
Clarification
The
standard allows a situation in which a certain CID is used for a certain DL
SFID and the same CID is used for another UL SFID. Does the same approach
apply for the SFID, i.e. can a certain SFID be used for UL and DL connection
and be distinguished by the TLV type [145/146]
Eyal
|