GSM Radio Optimization Basic GSM Radio Optimization GSM Radio Optimization GSM Radio Optimization
GSM
Thesis on impact of repeater on GSM Networks (Portuguese doc)
GSM - Arabic
GSM Timer: how to set timer in 2G network which is recommended by vendor. Please check the reference of parameter in GSM
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interview questions
GSM principles
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GSM Timer: how to set timer in 2G network which is recommended by vendor. Please check the reference of parameter in GSMFull description
Timer details.
SDCCH o o
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SDCCH is a dedicated channel which is using for LAC updation, Call setup, SMS in idle mode. It works in UL & DL. SD blocking means that you are not getting SD resource for the call origination. When MS connects with NW then RACH and AGCH are provided. After AGCH,SDCCH is provided but but if SDCCH is not provided at this this time due some problems or due to unavailable of SD by BSC ,it’s called as SD Blocking. There are no of reasons for that.If such a case arises the customer will not be able to originate any call.
Difference Between Blocking and Congestion: It is very important to know difference between blocking and congestion. Some people think that both are same, but they differ from each other. If all the SD resources are full and not available for SD assign then its come into congestion. If at a particular time call is attempted and it fails then it known as Blocking. Reasons for SD Blocking: Some of them are1. LAC boundary. 2.HW Prob. Solutions for removal of SD Blocking: Here are some steps by which we can reduce SD Blockingo
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Check the No. of SDCCH channel Available, if less then increase SD channel taking care that there is no TCH Blocking. Check LAC boundary, If location update is more then change the LAC of that site and set C2 and HYS. Use of Dynamic SDCCH (It is a BSC parameter and will be applied on whole BTS). Hardware check / shift SD to new time slot Some times BMA and HYS parameters are useful to remove SD Blocking.
TCH
1. TCH Congestion = time when all resources are occupied (no free TCH available) TCH Blocking = rejected (blocked) attempts over all attempts in %. Also there is different formulas formulas for TCH blocking. For example in subscriber perceived
TCH Blocking all successful directed retries to another cell are removed from the nominator.
Frequency Hopping
1. By 3*3 hoping we mean that 3 sites of 3 cells each u sing different MA list (We have 9 MA lists). 1*3 means that 1 site of 3 cells each used different MA list. this would imply that every cell in a site is using different MA list(we have 3 MA lists). In 1*1, we have only one MA list that is used by all cells. Separation is achieved only by MAIO and HSN.
