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LTE MAC : What is the use of "TPC-PUCCH-RNTI, TPC-PUSCH-RNTI" identifiers ?

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LTE MAC : What is the use of "TPC-PUCCH-RNTI, TPC-PUSCH-RNTI" identifiers ?
posted May 25, 2014 by Neeraj Mishra

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1 Answer

+3 votes

From 36.213 ---

5.1.1.1 UE Behaviour

PUSCH is a UE specific correction value, also referred to as a TPC command and is included in PDCCH with DCI format 0 or jointly coded with other TPC commands in PDCCH with DCI format 3/3A whose CRC paritybits are scrambled with TPC-PUSCH-RNTI
- If the TPC command PUSCH is included in a PDCCH with DCI format 0 where the CRC is scrambled by the Temporary C-RNTI
- The UE attempts to decode a PDCCH of DCI format 0 with the UE’s C-RNTI or SPS CRNTI and a PDCCH of DCI format 3/3A with this UE’s TPC-PUSCH-RNTI in everysubframe

5.1.2.1 UE Behaviour

PUCCH is a UE specific correction value, also referred to as a TPC command, included in a PDCCH with DCIformat 1A/1B/1D/1/2A/2 or sent jointly coded with other UE specific PUCCH correction values on a PDCCHwith DCI format 3/3A whose CRC parity bits are scrambled with TPC-PUCCH-RNTI.
- The UE attempts to decode a PDCCH of DCI format 3/3A with the UE’s TPC-PUCCH-RNTI and one or several PDCCHs of DCI format 1A/1B/1D/1/2A/2 with the UE’s C-RNTI or SPS C-RNTI on every subframe except when in DRX.
- If the UE decodes a PDCCH with DCI format 1A/1B/1D/1/2A/2 and the corresponding detectedRNTI equals the C-RNTI or SPS C-RNTI of the UE, the UE shall use the δ PUCCH provided in that PDCCH.

answer May 25, 2014 by Bart Barton
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+1 vote

They say it is unique identifier of ENB but where it will be useful?

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EnodeB considers CQI feedback from the UE before creating the transport block.
As per my understanding PUCCH resource allocation is not very dynamic. In this case how UE decide to use a specific MCS (Modulation and Coding Scheme) while using PUCCH channel ?

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