POWER BOOSTING AND TRANSPORT BLOCK SIZE (TBS) DESIGN IN A NEW RADIO (NR) SYSTEM

• US 20190045390A1
• Filed: 09/10/2018
• Published: 02/07/2019
• Est. Priority Date: 09/11/2017
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Intel IP Corporation (Intel Corporation)
• Inventors: Davydov, Alexei, HAN, SEUNG HEE, CHATTERJEE, DEBDEEP, He, Hong, MOROZOV, GREGORY V., NIMBALKER, AJIT, HAMIDI-SEPEHR, FATEMEH, LEE, DAE WON, KWAK, YONGJUN
• Granted Patent: US 10,939,321 B2
• Time in Patent Office: Days
• CPC Class Codes: H04L 1/0007 by modifying the frame length
• CPC Class Codes: H04W 28/0273 adapting protocols for flow control or congestion control to wireless environment, e.g. adapting transmission control protocol [TCP] wireless network protocols or protocol adaptations to wireless operation, e.g. wireless application protocol H04W80/00
• CPC Class Codes: H04W 28/0289 Congestion control load shedding arrangements in network planning H04W16/08; performing reselection for handling the traffic H04W36/22; wireless traffic scheduling H04W72/12

Abstract

Technology for a user equipment (UE) operable to determine a transport block size (TBS) is disclosed. The UE can determine a number of assigned resource elements (REs) in one or more symbols for a transport block. The UE can determine a reference number of REs per physical resource block (PRB) in the transport block based on a reference number of REs for the transport block corresponding to each PRB and an assigned number of PRBs for the transport block. The UE can determine a TBS for the transport block based at least on the reference number of REs per PRB in the transport block. The UE can encode information in a selected transport block for transmission via a physical uplink shared channel (PUSCH) to a Next Generation NodeB (gNB) in accordance with the TBS determined at the UE.

Claims

1. An apparatus of a user equipment (UE) operable to determine a transport block size (TBS), the apparatus comprising:

one or more processors configured to;

determine, at the UE, a number of assigned resource elements (REs) in one or more symbols for a transport block;

determine, at the UE, a reference number of REs per physical resource block (PRB) in the transport block based on a reference number of REs for the transport block corresponding to each PRB and an assigned number of PRBs for the transport block;

determine, at the UE, a TBS for the transport block based at least on the reference number of REs per PRB in the transport block, a scheduled modulation order, an intended code rate and a number of layers mapped to the TBS;

encode, at the UE, information in a selected transport block for transmission via a physical uplink shared channel (PUSCH) to a Next Generation NodeB (gNB) in accordance with the TBS determined at the UE; and

decode, at the UE, information in a selected transport block received from the gNB via a physical downlink shared channel (PDSCH) in accordance with the TBS determined at the UE; and

a memory interface configured to send to a memory an indication of the TBS.

2. The apparatus of claim 1, further comprising a transceiver configured to:

transmit the selected transport block via the PUSCH to the gNB in accordance with the TBS determined at the UE; and

receive the selected transport block via the PDSCH from the gNB in accordance with the TBS determined at the UE.

3. The apparatus of claim 1, wherein the one or more processors are configured to determine a number of bits associated with the TBS, wherein the number of bits is equal to Q_m×

R×

N_RE×

N_L, wherein N_RE represents the number of assigned REs, Q_m represents the scheduled modulation order from a modulation and coding scheme (MCS), R represents the intended code rate from the MCS, and N_L represents the number of layers mapped to the TBS.

4. The apparatus of claim 1, wherein the one or more processors are configured to:

adjust the number of assigned REs in the transport block based on an overhead adjustment factor that accounts for a variable number of unused REs due to a presence of other signals, wherein the overhead adjustment factor is separately configured for TBS determination for the PDSCH and the PUSCH; and

determine the reference number of REs by quantizing the number of assigned REs based on the overhead adjustment factor that is indicated to the UE using one or more of physical layer signaling, medium access control (MAC) signaling, radio resource control (RRC) signaling or a predetermined rule.

5. The apparatus of claim 1, wherein the one or more processors are configured to apply code block segmentation to the TBS to provide a single code block size for all code blocks of the TBS.

6. The apparatus of claim 5, wherein the one or more processors are configured to attach a cyclic redundancy check (CRC) for the transport block and a code block when the code block segmentation is applied to the TBS, wherein the single code block size is a multiple of 8.

7. The apparatus of claim 1, wherein the one or more processors are configured to determine the number of assigned REs based on downlink control information or higher layer signaling received from the gNB.

8. The apparatus of claim 1, wherein:

the reference number of PRBs is equal to a number of PRBs assigned in control information;

or

the TBS is defined for reduced packet sizes, and the TBS is selected from a specified set of values of reduced TB sizes and for up to a particular threshold TB size.

9. The apparatus of claim 1, wherein the one or more processors are configured to derive all TBSs such that a code block size for each transport block is a multiple of 8, wherein a cyclic redundancy check (CRC) is attached for the transport block and a code block when code block segmentation is applied to the TBS.

10. The apparatus of claim 1, wherein the one or more processors are configured to determine the TBS based on a single slot allocation when configured with slot aggregation for the PDSCH or the PUSCH, and other slots are retransmissions of a same transport block.

11. The apparatus of claim 1, wherein the one or more processors are configured to determine the number of assigned REs using one or more of:

a number of PRBs, a time domain allocation, a demodulation reference signal assigned in a slot, a channel state information reference signal (CSI-RS) or a sounding reference signal (SRS).

12. An apparatus of a user equipment (UE) operable to decode a variable power offset received from a Next Generation NodeB (gNB), the apparatus comprising:

one or more processors configured to;

decode, at the UE, the variable power offset received from the gNB that indicates a power level of power boosting applied by the gNB to a demodulation reference signal in a physical broadcast channel (DMRS-PBCH) relative to New Radio PBCH (NR-PBCH) resource elements (REs); and

detect, at the UE, a reference signal (RS) in the NR-PBCH based in part on the variable power offset received from the gNB; and

a memory interface configured to send to a memory an indication of the variable power offset.

13. The apparatus of claim 12, further comprising a transceiver configured to receive the variable power offset from the gNB.

14. The apparatus of claim 12, wherein the one or more processors are configured to decode the variable power offset received from the gNB via the NR-PBCH.

15. The apparatus of claim 12, wherein the variable power offset is selected from a limited set of possible variable power offset values.

16. The apparatus of claim 12, wherein the variable power offset is a two-bit value, and the variable power offset is selected from four possible variable power offset values.

17. The apparatus of claim 12, wherein the one or more processors are configured to:

decode an NR-PBCH of a serving cell;

determine the variable power offset between the PBCH-DMRS and the NR-PBCH REs;

determine a reconstructed NR-PBCH of the serving cell based on the variable power offset;

subtract the reconstructed NR-PBCH of the serving cell from a received signal at the UE to determine a NR-PBCH of a target cell;

perform a channel estimation using a PBCH-DMRS of the target cell; and

decode the NR-PBCH of the target cell based on the channel estimation.

18. At least one non-transitory machine readable storage medium having instructions embodied thereon for determining a transport block size (TBS) at a user equipment (UE), the instructions when executed by one or more processors at the UE perform the following:

determining, at the UE, a number of assigned resource elements (REs) in one or more symbols for a transport block;

determining, at the UE, a reference number of REs per physical resource block (PRB) in the transport block based on a reference number of REs for the transport block corresponding to each PRB and an assigned number of PRBs for the transport block;

determining, at the UE, a TBS for the transport block based at least on the reference number of REs per PRB in the transport block, a scheduled modulation order, an intended code rate and a number of layers mapped to the TBS;

encoding, at the UE, information in a selected transport block for transmission via a physical uplink shared channel (PUSCH) to a Next Generation NodeB (gNB) in accordance with the TBS determined at the UE; and

decoding, at the UE, information in a selected transport block received from the gNB via a physical downlink shared channel (PDSCH) in accordance with the TBS determined at the UE.

19. The at least one non-transitory machine readable storage medium of claim 18, further comprising instructions when executed perform the following:

determining a number of bits associated with the TBS, wherein the number of bits is equal to Q_m×

R×

N_RE×

N_L, wherein N_RE represents the number of assigned REs, Q_m represents the scheduled modulation order from a modulation and coding scheme (MCS), R represents the intended code rate from the MCS, and N_L represents the number of layers mapped to the TBS.

20. The at least one non-transitory machine readable storage medium of claim 18, further comprising instructions when executed perform the following:

adjusting the number of assigned REs in the transport block based on an overhead adjustment factor that accounts for a variable number of unused REs due to a presence of other signals, wherein the overhead adjustment factor is separately configured for TBS determination for the PDSCH and the PUSCH; and

determining the reference number of REs by quantizing the number of assigned REs based on the overhead adjustment factor that is indicated to the UE using one or more of physical layer signaling, medium access control (MAC) signaling, radio resource control (RRC) signaling or a predetermined rule.

21. The at least one non-transitory machine readable storage medium of claim 18, further comprising instructions when executed perform the following:

applying code block segmentation to the TBS to provide a single code block size for all code blocks of the TBS; and

attaching a cyclic redundancy check (CRC) for the transport block and a code block when the code block segmentation is applied to the TBS, wherein the single code block size is a multiple of 8.

22. The at least one non-transitory machine readable storage medium of claim 18, further comprising instructions when executed perform the following:

determining the number of assigned REs based on downlink control information or higher layer signaling received from the gNB.

23. The at least one non-transitory machine readable storage medium of claim 18, wherein:

the reference number of PRBs is equal to a number of PRBs assigned in control information;

or

the TBS is defined for reduced packet sizes, and the TBS is selected from a specified set of values of reduced TB sizes and for up to a particular threshold TB size.

24. The at least one non-transitory machine readable storage medium of claim 18, further comprising instructions when executed perform the following:

deriving all TBSs such that a code block size for each transport block is a multiple of 8, wherein a cyclic redundancy check (CRC) is attached for the transport block and a code block when code block segmentation is applied to the TBS.

25. The at least one non-transitory machine readable storage medium of claim 18, further comprising instructions when executed perform the following:

determining the TBS based on a single slot allocation when configured with slot aggregation for the PDSCH or the PUSCH, and other slots are retransmissions of a same transport block.

26. The at least one non-transitory machine readable storage medium of claim 18, further comprising instructions when executed perform the following:

determining the number of assigned REs using one or more of;

a number of PRBs, a time domain allocation, a demodulation reference signal assigned in a slot, a channel state information reference signal (CSI-RS) or a sounding reference signal (SRS).