Balancing BTS'es for handover

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Gullik Webjorn gullik.webjorn at corevalue.se
Sat Jan 12 19:22:05 UTC 2019


Below is a measurement on my "most distant" BTS, BTS 1. From what I see, 
downlink is 35 dB

below uplink, which of course is natural when the MS can produce 30 dBm, 
and the BTS which

in this case uses a bareback Limesdr min, can only produce 10 dBm.

the bsc parameter ms max power is set to 15 for both bts 0 and bts 1.

However, it seems MS output power is *much* stronger.

Further, my understanding is that it is the BTS level measurements that 
decides when to handover,

i.e. measurements in the upstream, and not the MS receive levels...

Since there is such a mismatch between the micro BTS and the MS, maybe 
the RX should be attenuated,

to bring upsteram levels more equal to downstream.

OsmoBSC# show conns
Active subscriber connections:
conn ID=6, MSC=0, hodec2_fail=0, mgw_ep=rtpbridge/1 at mgw
BTS 0, TRX 0, Timeslot 1, Lchan 0: Type TCH_F
   Connection: 1, State: ESTABLISHED
   BS Power: 20 dBm, MS Power: 16 dBm
   Channel Mode / Codec: SPEECH_V1
   No Subscriber
   Bound IP: 127.0.0.1 Port 16390 RTP_TYPE2=0 CONN_ID=0
   Conn. IP: 192.168.1.70 Port 4186 RTP_TYPE=3 SPEECH_MODE=0x00
   Measurement Report:
     Flags:
     MS Timing Offset: 0
     L1 MS Power: 16 dBm, Timing Advance: 0
     RXL-FULL-dl: -110 dBm, RXL-SUB-dl: -110 dBm RXQ-FULL-dl: 5, 
RXQ-SUB-dl: 5
     RXL-FULL-ul:  -74 dBm, RXL-SUB-ul:  -73 dBm RXQ-FULL-ul: 3, 
RXQ-SUB-ul: 1

What are *your* experiences with "power control" and with "handover".

Best Regards,

Gullik




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