https://osmocom.org/https://osmocom.org/favicon.ico?16647414092021-10-18T10:12:09ZOpen Source Mobile CommunicationsOsmoPCU - Bug #5227: osmo-pcu: Attempt recovery of TBF when one of its assigned PDCH TS becomes disabledhttps://osmocom.org/issues/5227?journal_id=227632021-10-18T10:12:09Zpespin
<ul></ul><p>TS 44.060 8.1.1 Uplink RLC data block transfer:<br /><pre>
The network may, at any time during uplink packet transfer, change the TTI configuration or USF mode (BTTI USF
mode or RTTI USF mode) as well as the corresponding downlink PDCH-pairs of an already established uplink TBF by
sending on the downlink PACCH, an uplink TBF assignment message (e.g. PACKET UPLINK ASSIGNMENT,
MULTIPLE TBF UPLINK ASSIGNMENT, PACKET TIMESLOT RECONFIGURE, MULTIPLE TBF TIMESLOT
RECONFIGURE or PACKET CS RELEASE INDICATION). The mobile station shall begin using the new parameters
within the reaction time defined in 3GPP TS 45.010.
</pre></p>
<p>8.1.1.1.2 Resource Reallocation for Uplink:<br /><pre>
The network may at any time during uplink packet transfer initiate a change of resources by sending on the downlink
PACCH monitored by the MS, an unsolicited uplink assignment message (e.g. PACKET UPLINK ASSIGNMENT,
MULTIPLE TBF UPLINK ASSIGNMENT, PACKET TIMESLOT RECONFIGURE, MULTIPLE TBF TIMESLOT
RECONFIGURE or PACKET CS RELEASE INDICATION message) to the mobile station. During the reallocation,
TFI is allowed to be changed. A mobile station that supports multiple TBF procedures shall act on the uplink
assignment message as defined in sub-clause 8.1.2.5.
</pre></p>
<p>Check whole section "8.1.1.3a.5 Resource Reallocation for Uplink" and "8.1.2.4 Resource Reassignment for Downlink".</p>
<p>Also, have a look at message "PACKET TIMESLOT RECONFIGURE" and "PACKET CS RELEASE INDICATION"</p>
<p>We should at least notify the related MS that the TBF is freed, see "8.1.1.4 Network initiated release of uplink TBF":<br /><pre>
The network may initiate release of an uplink TBF by transmitting a PACKET TBF RELEASE message to the mobile
station on the PACCH.
</pre></p>