Recent posts under tag mac

+1 vote

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does seperate harq process exists for BCH?

posted Aug 24, 2017 by anonymous

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Why SGW is buffering UE data, however ENB PDCP buffers the data then why buffering is needed in SGW?

posted Aug 23, 2017 by Charan Shah

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Why do we need NDI bit in HARQ process?However we have ACK/NACK mechanism then why do we need to NDI?

posted Aug 21, 2017 by Himani

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Why do we need LCG in MAC? Instead of LCG can't we use LC?

posted Aug 10, 2017 by Dheerendra

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What is transparent MAC in 5G and which scenario it is used?

posted Aug 7, 2017 by Jaganathan

+2 votes

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What is Activation/Deactivation of PDCP duplication MAC CE?

posted Aug 4, 2017 by Jaganathan

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Why SPS is mostly used in UL communication, Why not widely used in DL communication?

posted Aug 4, 2017 by Sakshi Rai

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What is padding BSR and why it is needed?

posted Aug 3, 2017 by Dheerendra

+2 votes

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How contention will be resolved in case ENB selected preamble?

posted Aug 1, 2017 by Himani

+2 votes

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Ho many times can we re-transmit the RACH preamble?

posted Aug 1, 2017 by Ankit Mishra

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Is it possible to aggregate two different ENB with two different Bands in LTE?

posted Jul 27, 2017 by Akhilesh

+2 votes

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Without MAC HARQ configuration how MSG3 is receiving ACK/NACK form ENB ,

posted Jul 27, 2017 by Akhilesh

+2 votes

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How many no of TB's can be transmitted per TTI in LTE?

posted Jul 20, 2017 by Rohit Verma

+2 votes

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What is the use of TTI bundling and when it will be enabled?

posted Jul 18, 2017 by Akhilesh

+2 votes

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Why secondary carrier is not having control channels?

posted Jul 11, 2017 by Himani

+1 vote

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What is PHY/MAC parallel processing in 5G NR?

posted Jul 6, 2017 by Jaganathan

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Why UL CE is added only in end of MAC PDU of NR?

posted Jul 6, 2017 by Jaganathan

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Why Asynchronous UL HARQ is introduced on eMBB?

posted Jul 5, 2017 by Jaganathan

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What are all parameters considered while scheduling D2D channel?

posted Jul 4, 2017 by Jaganathan

+2 votes

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Why E field is not introduced in Rel15 MAC?

posted Jul 4, 2017 by Jaganathan

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What is MAC CE ordering in 5G?

posted Jun 30, 2017 by Jaganathan

+3 votes

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Are we having dedicated signaling channel in secondary cell group of Rel14?

posted Jun 30, 2017 by Jaganathan

+1 vote

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What is split Bearer in MAC and How it works?

posted Jun 29, 2017 by Jaganathan

+2 votes

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What is recommended bit rate MAC CE?

posted Jun 29, 2017 by Jaganathan

+3 votes

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What is V-RNTI in LTE and When it is used?

posted Jun 28, 2017 by Jaganathan

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What is the use of rach-SkipSCG flag in MAC entity of Rel14?

posted Jun 28, 2017 by Jaganathan

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DCI signalling from eNB to LAA?

posted Jun 27, 2017 by Balagopal 24

+1 vote

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What is Multi-tone MSG3 transmission in LTE?

posted Jun 23, 2017 by Jaganathan

+1 vote

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What is PDU filtering in MAC Rel14?

posted Jun 23, 2017 by Jaganathan

+2 votes

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What is the difference between dual connectivity and carrier aggregation in LTE?

posted Jun 22, 2017 by Jaganathan

+2 votes

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What is the meaning of numerologies/ TTI duration in LTE-NR?

posted Jun 21, 2017 by Jaganathan

+1 vote

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Why UL MIMO is not used widely? Why UL MIMO is only 4 * 4?

posted Jun 13, 2017 by Dheerendra

+2 votes

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What is CCE allocation in LTE? What is the relationship between CCE and aggregation level?

posted Jun 8, 2017 by Charan Shah

+3 votes

1 answer

Why do we need HIDCI and UL-CONFIG message in FAPI? because both are carrying UL allocation information.

posted Jun 7, 2017 by Himani

+2 votes

1 answer

LTE: Why radio sub frame is 1 ms long ? Is it possible to bring the sub frame duration in the unit of microseconds ?

posted Jun 6, 2017 by Harshita

+1 vote

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Why HARQ ACK delay is 3ms?

posted Jun 5, 2017 by Ankit Mishra

+1 vote

2 answers

Why we need MAC to PHY interface in LTE? Why we dont have standard interface between other layers ?

posted Jun 2, 2017 by Himani

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How do I reset the password on my Mac?

posted May 31, 2017 by anonymous

+1 vote

2 answers

In LTE FDD MODE if uplink and downlink band width are different then how the UE will know about that ?

posted May 31, 2017 by anonymous

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What is multiplexing in MAC?

posted May 30, 2017 by Ankit Mishra

+1 vote

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why QPSK modulation scheme is used for all control channels in LTE ?

posted May 27, 2017 by anonymous

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WHy HARQ re-ordering in is RLC?But HARQ functionality is done by MAC?

posted May 26, 2017 by Himani

+1 vote

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Why RLCID is needed?

posted May 15, 2017 by Dheerendra

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What is maxHARQ-msg3Tx IE in RACH config ?

posted May 15, 2017 by Gnanendra Reddy

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Why LCP is only at UE side , why not at ENB side?

posted Apr 28, 2017 by Poonam

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Is there any UL scheduler available at UE side ?

posted Apr 26, 2017 by Poonam

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How UE will calculate channel quality indicator ?

posted Apr 21, 2017 by Himani

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What is the use of DRXi inactivity timer and DRX retransmission timer?

posted Apr 19, 2017 by Charan Shah

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What is bucket size duration in LTE?

posted Apr 17, 2017 by Ankit Mishra

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How warning messages scheduled in MAC layer?

posted Apr 13, 2017 by Sakshi Rai