Project

General

Profile

Feature #4941

VAMOS support in OsmoBTS

Added by laforge 4 months ago. Updated 22 days ago.

Status:
In Progress
Priority:
Urgent
Assignee:
Category:
-
Target version:
-
Start date:
01/12/2021
Due date:
% Done:

20%

Spec Reference:

Description

This ticket should document what needs to be done in terms of supporting VAMOS from OsmoBTS, and to track its status via check-lists and possibly sub-issues.

Our implementation will be focusing on osmo-bts-trx as none of the "proprietary PHY" we support implement any VAMOS support.

This likely includes (at least)
  1. Indication of [which level of] VAMOS support the BTS has via OML attributes to BSC
  2. Implementation of "shadow TRX" concept in data structures
  3. Implementation of VAMOS related RSL extensions on Abis
  4. Implementation of a new TRXDv2 protocol from/to the TRX
  5. VAMOS-aware uplink + downlink power control
  6. generation of one set of downlink symbols from the real + shadow timeslot/lchan

The corresponding BSC related work is tracked in #4940


Related issues

Related to OsmoBSC - Feature #4940: VAMOS support in OsmoBSCNew01/12/2021

Related to Cellular Network Infrastructure - Feature #4006: TRX protocol: wind of changeIn Progress05/17/2019

Blocked by Cellular Network Infrastructure - Bug #5112: osmo-gsm-manuals: build verification is brokenResolved04/10/2021

History

#1 Updated by laforge 4 months ago

#2 Updated by Hoernchen 4 months ago

According to https://opus4.kobv.de/opus4-fau/files/5533/DissertationMichaelRuder.pdf chapter 4 random pairings with scpir=0 should be fine for the time being.

#3 Updated by fixeria 4 months ago

  • Status changed from New to In Progress

#4 Updated by fixeria 3 months ago

#5 Updated by fixeria about 1 month ago

  • Blocked by Bug #5112: osmo-gsm-manuals: build verification is broken added

#6 Updated by fixeria 22 days ago

  • % Done changed from 0 to 20

I've submitted a bunch of TRXDv2 related changes to Gerrit:

https://gerrit.osmocom.org/c/osmo-bts/+/23822 osmo-bts-trx: cosmetic: TRXD 'header version' -> 'PDU version'
https://gerrit.osmocom.org/c/osmo-bts/+/23823 osmo-bts-trx: remove outdated TRXD protocol documentation
https://gerrit.osmocom.org/c/osmo-bts/+/23824 osmo-bts-trx: cosmetic: use '#pragma once' in trx_if.h
https://gerrit.osmocom.org/c/osmo-bts/+/23825 osmo-bts-trx: reduce and share TRXC message buffer size
https://gerrit.osmocom.org/c/osmo-bts/+/23826 osmo-bts-trx: move TRXD message length to trx_if.h
https://gerrit.osmocom.org/c/osmo-bts/+/23827 osmo-bts-trx: 'burst type' is actually modulation type
https://gerrit.osmocom.org/c/osmo-bts/+/23828 osmo-bts-trx: move MTS parser into trx_data_parse_mts()
https://gerrit.osmocom.org/c/osmo-bts/+/23829 osmo-bts-trx: discard TRXD PDUs with unexpected version
https://gerrit.osmocom.org/c/osmo-bts/+/23830 osmo-bts-trx: move TDMA frame number check to trx_data_read_cb()
https://gerrit.osmocom.org/c/osmo-bts/+/23831 osmo-bts-trx: cosmetic: get rid of TRX_CHDR_LEN macro
https://gerrit.osmocom.org/c/osmo-bts/+/23832 osmo-bts-trx: refactor handling of version specific TRXD parts
https://gerrit.osmocom.org/c/osmo-bts/+/23833 osmo-bts-trx: implement TRXDv2 protocol support

together with other L1SAP/RSL related changes (all of them have been merged):

https://gerrit.osmocom.org/c/libosmocore/+/23788 protocol/gsm_08_58.h: add RSL_CMOD_SP_{GSM4,GSM5,GSM6}
https://gerrit.osmocom.org/c/libosmocore/+/23789 protocol/gsm_08_58.h: add more 'Channel rate and type' values
https://gerrit.osmocom.org/c/libosmocore/+/23790 protocol/gsm_08_58.h: add asymmetric CSD data rates

https://gerrit.osmocom.org/c/osmo-bts/+/23787 l1sap: fix incorrect pointer cast in l1sap_chan_act()
https://gerrit.osmocom.org/c/osmo-bts/+/23791 rsl: rename, fix and refactor lchan_tchmode_from_cmode()
https://gerrit.osmocom.org/c/osmo-bts/+/23792 rsl: add missing Channel Mode values to rsl_handle_chan_mod_ie()

Also available in: Atom PDF

Add picture from clipboard (Maximum size: 48.8 MB)