1. What is full form of RLC and and
position in all layers, where it stand in lte?
Ans:RADIO LINK CONTROL and L2 position,
its stand in between MAC and PDCP.
2. What are the basic function of RLC?
Ans: Functions are:
(i)
Concatenation and segmentation of RLC
SDUs
(ii)
ARQ for retransmission
(iii)
Buffered the data.
3. Name of 3 Entities of RLC Layer?
Ans: 3 Entities of RLC Layer are:
(i)
Transparent Mode
(ii)
Unacknowledged Mode
(iii)
Acknowledged Mode
4. For which services which entity is
used?
Ans: Services which entity is used are:
(i)
RLC TM: Used at before RRC connection
is established for PCCH,BCCH and CCCH channel
(ii)
RLC UM: Used at after RRC connection
in established and deal with IP packets user data for DTCH channel
(iii)
RLC AM: Used for after RRC connection
is establishedand deals with DCCH and
DTCH channel
5. Describe header formats of UMD PDU in
RLC?
Ans: E=Extension (if 1=Next header
present,0= No next header), R=Reserve,
FI= Frame Indiactor(0=Start and
Complete Stop here, 1= continue from previous TTI and move on to Next TTI),SN=Sequence Numbering, LI=Length Indicator, P=Padding.
|
R
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R
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R
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F
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I
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E
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SN
|
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SN
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||||||
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E
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LENGTH
INDICATOR
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|||||
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LENGTH
INDICATOR
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PADDING
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|||||
UMD
HEADER
6. What is Frame Indicator [FI] ? How
much length it have in bits ? What are the possible indicators?
Ans: , FI= Frame Indiactor(0=Start from and Complete Stop in this TTI
here, 1= continue from previous TTI and move on to Next TTI).
2
Bits in size and (00,01,10,11) are the possible values.
7. What is Last Indicator [LI] ?how much
it's header length and message length?
Ans: Length Indicator is a data size
available for a TTI and 11 bits in size.
8. What is SO_start and SO_end?
Ans: SO_start field indicate the position
of the first byte of the portion of the AM PDU
SO_END
indicate the position of the last byte of the portion of the AM PDU.
9. What is polling bit? How is it
managed?
Ans: Polling bit is used for indicate the
reciever RLC for giving Status of recieved PDU. Its a manged by putting ‘P’ bit
in a RLC AM header either 0 and 1.
10. If error is occur in AM mode where
data copy is stored to overcome error?
Ans: Data stored in RLC buffer and
indicated by ARQ.
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