- This topic has 18 replies, 1 voice, and was last updated 12 years, 5 months ago by krish.
28th May 2009 at 17:16 #57340krishGuest
can anyone explain me by using intra cell handover can i control the tch drop?30th May 2009 at 10:21 #57341coldfire222Guest
somehow it can control tch drop … it can actually improve your DCR if the intra cell handover parameters are well defined30th May 2009 at 16:51 #57342krishGuest
hey can u tell me how to modify it and how we can control tch drop/1st June 2009 at 07:06 #57343MAKGuest
in which phase you are talking abt for intracell handover either it is for unlink or downlink interferece?1st June 2009 at 16:50 #57344krishGuest
ya for both i want to know if i will increase or decrease the max intra cell handover then what it will affcet?1st June 2009 at 18:26 #57345PixGuest
Your question has many different answers, depending on what is your cell design, trx design, etc.
To be simple, just try to increase the intracell ho, then decrease it, and see which one work the best.
Optimization is mostly about trials. You can’t predict what’s going to work the best in such case.
Still, if a HO is triggered, it means there is an issue in the cell. The best idea is to fix the initial problem (remove the interference, etc.)2nd June 2009 at 17:15 #57346KRISHGuest
YA THATS RIGHT BUT IF I TRIIGER THE INTRA HANDOVER AT BAD QUALITY THEN IT WILL GIVE GAIN AND DO U KNOW ABT ITS TIMER TINIT AND TMAXIHO IN ERICSSON SYSTEM2nd June 2009 at 17:16 #57347PixGuest
NO I DON’T KNOW ERICSSON !!!!!!!!!!!!!!!!!!!!2nd June 2009 at 17:36 #57348KRISHGuest
OK THEN TELL ME INGENERAL HOW WE CAN PLAY WITH IT FOR IMPROVING TCH DROPPED? AND DO U KNOW ABT T3101 TIMER/2nd June 2009 at 22:19 #57349PixGuest
T3101 reminds me of a timer used in HO procedure, isn’t it ?
Can you recall the definition ?
How can you play with intracell HO :
the goal is that the MS is located on another TRX, so that the call will be carried by a different frequency. This is done in order to escape from an interfered frequency.
If MS is on TRX3/TS6, and if TRX3 is transmitting frequency 57 (example):
– if the rxqual is bad and the rxlev is good, it means the call is interfered. In this scenario, it is a good idea to perform a intracell ho, to relocate the call onto another TRX.3rd June 2009 at 17:27 #57350krishGuest
ok thanks pix so i can play by increasing or decreasing the rx quality with intracell handover is it?4th June 2009 at 09:59 #57351EdGuest
I definitely agree with pix. Basic idea is to trigger intra cell handover when signal strength is sufficent and bad rx quality at the same time to escape interference by changing channel within the cell.
For your inquiry regarding the ericsson parameters here’s some info and i hope i might help you:
When intracell handover takes place TMAXIHO is triggered to 1 and is incremented by 1 every each successful intra cell handover until it reaches the the maximum limit which is defined by the parameter MAXIHO. At this point any further consecutive intra cell handovers are inhibited at a duration defined by the parameter TIHO.When TIHO expires intra cell handover counter is reset back to zero. Then loops back again to same algorithm. TINIT is the time duratin when locating is not allowed after a successful change of channel.4th June 2009 at 17:14 #57352krishGuest
ok thanks ed but by increasing or decreasing the timer tmaxiho,tinit and maxiho what will be exact effect?6th June 2009 at 07:32 #57353EdGuest
For TMAXIHO AND MAXIHO; The effect is basically dependent on the difference of the two values. The greater the difference the greater is the no of consecutive intra cell handovers allowed before consecutive handovers are inhibited.
Increasing TINIT on the otherhand increases the time wherein locating is disallowed after mobile changed channel. This will somehow control pingpong intracell handover if properly set.
I suggest if your network do have test BTS try adjusting these parameters for you to experience the actual effect..or you can also collect stats after you set some intracell handover parameters before and after and see difference.7th June 2009 at 10:02 #57354krishGuest
ok thanks ed hey do u know abt t3101 timer