From: pborla <pborla@radisys.com>
Date: Sun, 18 Aug 2024 14:34:58 +0000 (+0530)
Subject: [Bug-ID: ODUHIGH-625]: Adding trigger for BuildAndSendRlcMaxRetransIndToDu and handli... 
X-Git-Url: https://gerrit.o-ran-sc.org/r/gitweb?a=commitdiff_plain;h=refs%2Fchanges%2F69%2F13269%2F2;p=o-du%2Fl2.git

[Bug-ID: ODUHIGH-625]: Adding trigger for BuildAndSendRlcMaxRetransIndToDu and handling RlcMaxRetransInd at DU

Change-Id: Ic621583d5d2707889fb1465fab99f72a9a3d6aa7
Signed-off-by: pborla <pborla@radisys.com>
---

diff --git a/src/5gnrrlc/rlc_amm_dl.c b/src/5gnrrlc/rlc_amm_dl.c
index 8ff2695ff..f1016fb45 100755
--- a/src/5gnrrlc/rlc_amm_dl.c
+++ b/src/5gnrrlc/rlc_amm_dl.c
@@ -53,6 +53,7 @@
 #include "rlc_utils.h"            /* RLC defines */
 #include "rlc_dl_ul_inf.h"
 #include "rlc_dl.h"
+#include "rlc_mgr.h"
 
 //UDAY
 #ifdef L2_OPTMZ
@@ -2230,6 +2231,11 @@ static Void rlcAmmDlMarkPduForReTx(RlcCb *gCb,RlcDlRbCb *rbCb,RlcRetx *retx)
             rlcUtlSendDedLcBoStatus(gCb, rbCb, 0,0,0,0);
             rlcAmmSndStaInd(gCb, rbCb, retx);
             gRlcStats.amRlcStats.numDLMaxRetx++;
+            
+            /* As per 38.322, RLC on reaching maxRetxThreshold in AM mode following needs to be done: */
+            /* if RETX_COUNT = maxRetxThreshold: */
+            /* - indicate to upper layers that max retransmission has been reached. "*/
+            BuildAndSendRlcMaxRetransIndToDu(rbCb->rlcId.cellId, rbCb->rlcId.ueId, rbCb->lch.lChId, rbCb->lch.lChType);
          }
 
          rlcRemRetxPdu(gCb,rbCb, retx);
diff --git a/src/5gnrrlc/rlc_mgr.h b/src/5gnrrlc/rlc_mgr.h
index 956b77282..423ce02ee 100644
--- a/src/5gnrrlc/rlc_mgr.h
+++ b/src/5gnrrlc/rlc_mgr.h
@@ -22,6 +22,7 @@ uint8_t SendRlcUeCreateRspToDu(Pst *pst, RlcCfgCfmInfo *cfgRsp);
 uint8_t SendRlcUeReconfigRspToDu(Pst *pst, RlcCfgCfmInfo *cfgRsp);
 uint8_t sendRlcUeDeleteRspToDu(uint16_t cellId, uint8_t ueId, CauseOfResult  status);
 uint8_t sendRlcUeReestablishRspToDu(uint16_t cellId,uint8_t ueId, CauseOfResult  status);
+uint8_t BuildAndSendRlcMaxRetransIndToDu(uint16_t cellId,uint8_t ueId, uint8_t lcId, uint8_t lcType);
 /**********************************************************************
          End of file
 **********************************************************************/
diff --git a/src/du_app/du_ue_mgr.c b/src/du_app/du_ue_mgr.c
index c3e2d1d92..a6d0f9117 100644
--- a/src/du_app/du_ue_mgr.c
+++ b/src/du_app/du_ue_mgr.c
@@ -166,8 +166,17 @@ uint8_t DuProcRlcMaxRetransInd(Pst *pst, RlcMaxRetransInfo *maxRetransInfo)
          GET_CRNTI(crnti, ueId);
          if(duCb.actvCellLst[cellIdx]->ueCb[ueId-1].crnti ==  crnti)
          {
-            /*TODO: complete the processing of max retransmission */
-            ret = ROK;
+            
+            /* As the spec 38.322 in Sec5.3.2(ARQ Procedures) doesn't mention exactly what upper layer needs to do as next steps:*/
+            /* if RETX_COUNT = maxRetxThreshold:- indicate to upper layers that max retransmission has been reached.*/
+            /*Thus as per our implementation scope, DU-Initiated UE release is triggered */
+
+            if(BuildAndSendUeContextReleaseReq(maxRetransInfo->cellId, maxRetransInfo->ueId) != ROK)
+            {
+               DU_LOG("\nERROR  -->  DU APP : Failed to build and send ue context release request");
+            }
+            else
+              ret = ROK;
          }
          else
             DU_LOG("\nERROR  -->  DU APP : DuProcRlcMaxRetransInd(): CRNTI [%d] not found", crnti);