OAI修改SSB个数配置报错
OAI配置文件里gnb.conf中的ssb_PositionsInBurst_Bitmap配置项修改为15，可以观察到每个20MS周期发送了四个SSB。
但是运行会各种报错。另外CCE找不到空闲的这种报错经常有，一种是当重建的时候会有，一种是调度Msg3重传的时候会有。
现象1：ssb_PositionsInBurst_Bitmap配置为15
Frame 733, slot 19 Initiating RA procedure with preamble 44, energy 48.0 dB (I0 239, thres 150), delay 4 start symbol 8 freq index 0
cce_list != 0 cce_list: 1
nr_generate_Msg2(): cannot find free CCE for RA RNTI 2d1b!
Frame 735, slot 19 Initiating RA procedure with preamble 44, energy 48.0 dB (I0 260, thres 150), delay 4 start symbol 8 freq index 0
cce_list != 0 cce_list: 1
nr_generate_Msg2(): cannot find free CCE for RA RNTI b5cb!
Frame 737, slot 19 Initiating RA procedure with preamble 44, energy 48.0 dB (I0 275, thres 150), delay 4 start symbol 8 freq index 0
cce_list != 0 cce_list: 1
nr_generate_Msg2(): cannot find free CCE for RA RNTI 6b38!
Frame 739, slot 19 Initiating RA procedure with preamble 44, energy 48.0 dB (I0 283, thres 150), delay 4 start symbol 8 freq index 0
cce_list != 0 cce_list: 1
nr_generate_Msg2(): cannot find free CCE for RA RNTI 1170!
Frame 741, slot 19 Initiating RA procedure with preamble 44, energy 48.0 dB (I0 290, thres 150), delay 4 start symbol 8 freq index 0
FAILURE: CC_id 0 Frame 741 initiating RA procedure for preamble index 44
Frame 743, slot 19 Initiating RA procedure with preamble 44, energy 48.0 dB (I0 295, thres 150), delay 4 start symbol 8 freq index 0
FAILURE: CC_id 0 Frame 743 initiating RA procedure for preamble index 44
Frame 745, slot 19 Initiating RA procedure with preamble 44, energy 48.0 dB (I0 298, thres 150), delay 5 start symbol 8 freq index 0
现象2：ssb_PositionsInBurst_Bitmap配置为15
Frame 313, slot 19Initiating RA procedure with preamble 26, energy 51.0 dB (I0 264, thres 150),delay 9 start symbol 4 freq index 0 CC_id 0 Frame 314, slotP 7:Generating RA-Msg2 DCI, rnti 0x10f, state 1 Generate RAR MAC PDU frame 314 slot 7preamble index 26 TA command 9 In nr_fill_rar: Transmitted RAR with t_alloc2 f_alloc 528 ta_command 9 mcs 0 freq_hopping 0 tpc_command 3 csi_req 0 t_crntia09b Frame 314, Subframe 7: RAstate 2 L729 Random Access 0 has RNTI a09b Adding UE with rnti a09b (num_UEs 0) Add NR UE_id 0 : rnti a09b reset RA state information for RA-RNTIa09b/index 0 PUSCH with TC_RNTI a09breceived correctly, adding UE MAC Context UE_id 0/RNTI a09b RA-Msg3 received (sdu_lenP 12)g_msg_type: 0 Returning new UE context at 0x7fdefc001c80 rrc_gNB_generate_RRCSetup Logical Channel DL-CCCH, Generating RRCSetup (bytes 51) Modified UE_id 0/a09b with CellGroup Adding SchedulingRequestconfig Adding BSR config Adding TAG config Adding PHR config Adding LCID 1 (SRB 1) Scheduling RA-Msg4 for TC_RNTI a09b (state4, frame 316, slot 1) UnexpectedULSCH HARQ PID 0 (have -1) for RNTI a09b (ignore this warning for RA) Ignore assert. cce_list != 0 cce_list: 1 cce_list != 0 cce_list: 1 cce_list != 0 cce_list: 1 cce_list != 0 cce_list: 1 CC_id 0 Frame 316, slotP 1:Generating RA-Msg4 DCI, state 4 Assertion (pdcch_received== 0) failed!In nr_schedule_response()/opt/oai/nr/20211012-ran-develop-idcatch/openair1/SCHED_NR/fapi_nr_l1.c:211pdcch_received is not 0, we can only handle one PDCCH PDU per slot Frame 316, Subframe 1: RAstate 5 Exiting executionLinux signal Aborted...
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