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Simu5G 1.4.4

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@avarga avarga released this 23 May 20:00
v1.4.4
5b67d3d

This release contains bug fixes and improvements, including more realistic MAC layer modeling and several MEC fixes.

Tested with INET-4.5.4 and OMNeT++ 6.3, compatible with INET-4.6.0 and OMNeT++ 6.1 through 6.4.

MAC improvements

  • RACH preamble collision modeling: UEs now pick a random preamble index
    when sending Random Access Channel (RAC) requests. The eNB detects collisions
    when multiple UEs choose the same preamble in a TTI, causing all colliding
    requests to fail. Failed UEs exercise the existing backoff/retry path. A new
    NED parameter numPreambles (default 64) controls the preamble pool size.
    While this is an abstraction of the real multi-step RACH procedure, it
    faithfully captures preamble contention (the primary source of access
    failures) with minimal additional model complexity.

  • NR MAC timer defaults adjusted: raResponseWindow changed from 3 to 20,
    retxBsrTimer from 40 to 320. The original values were the LTE defaults, too
    aggressive for NR's finer timing granularity. Also adjusted maxRacAttempts
    (10) and racBackoffMax (20) for both LTE and NR.

  • Default HARQ processes for NR changed to 5 (from 8), reflecting the
    asynchronous nature of NR HARQ.

  • RAC/BSR timer parameters are now configurable from NED (previously
    hardcoded).

Bug fixes

  • Ip2Nic: Fixed issue #302 -- packets arriving at the old gNB just after a
    handover are now forwarded to the new gNB over X2, instead of causing an error.

  • Ip2Nic: Fixed fallback to NR node ID when a UE has no LTE ID, which is
    necessary for handling NR-only UEs.

  • MAC: Fixed ASSERT failure on D2D mode switching (SinglePair-modeSwitching
    scenario). When switching from DM to IM mode, the MAC connection structure is
    now preserved with empty buffers instead of being destroyed, so that switching
    back to DM mode works correctly.

  • GtpUserX2: Fixed GtpUserMsg chunk length to 8B, consistent with GtpUser.

  • MecOrchestrator: Fixed contextIdCounter never being incremented, causing
    every MEC app to overwrite the previous map entry at key 0.

  • MecOrchestrator: Fixed missing return after a failure path that caused an
    end-iterator dereference.

  • MecAppBase: Fixed undisposed HttpMessageStatus objects on destruction.

  • MecResponseApp, MecRTVideoStreamingReceiver: Fixed missing localUePort
    parameter that was inadvertently removed during earlier refactoring.

  • RniService: Fixed incomplete CamelCase renaming that caused the service to
    not be found in the registry.

  • MEC: Fixed uninitialized variables that caused non-deterministic fingerprint
    failures in debug builds.

Other changes

  • Binder: getNextHop() renamed to getServingNodeOrSelf() for clarity.

  • UDP error handling: Refactored several application modules (including
    UeWarningAlertApp, UeRnisTestApp, UeRequestApp, and others) to use
    UdpSocket::ICallback, fixing errors when receiving ICMP "destination
    unreachable" indications. MEC apps now also properly close their UDP sockets.

  • Copyright headers adjusted: Replaced generic "Authors" lines with precise
    copyright lines and added SimuLTE copyright attribution to files derived from
    SimuLTE.

  • INET 4.6 compatibility: Added checksumMode parameter to emulation
    examples alongside the existing crcMode for backward compatibility.

  • TrafficLightController: Made backward compatible with OMNeT++ 6.1.

Assets 4
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