Method and apparatus for uplink control signaling with massive carrier aggregation
A method of operating a wireless communication system is disclosed. The method includes configuring a user equipment (UE) for carrier aggregation with N serving cells, where N is a positive integer. The UE is scheduled to receive downlink data from M of the N serving cells at a first time, where M is a positive integer less than or equal to N. The UE provides uplink control information (UCI) for only the M serving cells.
1 . A method comprising:
receiving a plurality of control bits;
encoding the control bits with a convolutional encoder to produce encoded control bits;
modulating the encoded control bits to produce Quadrature Amplitude Modulation (QAM) symbols;
spreading the QAM symbols with a length-24 Discrete Fourier Transform (DFT) to produce DFT-spread symbols; and
performing an Inverse Fast Fourier Transform on the DFT-spread symbols to produce Single-Carrier Frequency Division Multiple Access (SC-FDMA) control information symbols in an uplink subframe.
2 . The method of claim 1 , wherein encoding the plurality of control bits comprises tail-biting convolutional encoding.
3 . The method of claim 1 , wherein the encoded control bits are rate matched according to a number of frequency tones available for transmission.
4 . The method of claim 1 , wherein modulating the encoded control bits comprises Quadrature Phase Shift Keying.
5 . The method of claim 1 , wherein spreading the QAM symbols comprises:
performing a modulo 24 shuffling on the spread symbols;
mapping the spread symbols into two contiguous Resource Blocks (RBs); and
spreading with an orthogonal code across a plurality of SC-FDMA symbols in a slot of a subframe.
6 . The method of claim 1 , further comprising mapping the DFT-spread symbols across the SC-FDMA symbols of a Physical Resource Block (PRB) pair in a subframe.
7 . The method of claim 5 , wherein a Physical Uplink Control Channel (PUCCH) resource index n is dynamically signaled from 0 to number of uplink RBs minus 1.
8 . The method of claim 5 , wherein a Physical Uplink Control Channel (PUCCH) resource index n is dynamically signaled from 0 to two times a number of uplink RBs minus 1.
9 . The method of claim 1 , wherein the control bits comprise Hybrid Automatic Repeat Request Acknowledgement (HARQ-ACK) bits and Channel State Information (CSI) bits, and wherein a first encoding and rate matching is applied to the HARQ-ACK bits, and a second encoding and rate matching is applied to the CSI bits.
10 . The method of claim 9 , wherein the HARQ-ACK bits are mapped to the SC-FDMA symbols adjacent a Demodulation Reference Signal (DMRS)SC-FDMA symbol in each slot of a subframe.
11 . A method comprising:
encoding a plurality of control bits to produce encoded control bits;
modulating the encoded control bits to produce Quadrature Phase Shift Keying (QPSK) symbols;
spreading the QPSK symbols with a length-24 Discrete Fourier Transform (DFT) to produce DFT-spread symbols;
mapping the DFT-spread symbols into two contiguous Resource Blocks (RBs);
performing a transform on the DFT-spread symbols to produce symbols; and
transmitting the symbols.
12 . A user equipment (UE) comprising a processor and a memory, the UE configured to:
encode a plurality of control bits to produce encoded control bits;
modulate the encoded control bits to produce Quadrature Phase Shift Keying (QPSK) symbols;
spread the QPSK symbols with a length-24 Discrete Fourier Transform (DFT) to produce DFT-spread symbols;
map the DFT-spread symbols into two contiguous Resource Blocks (RBs);
perform a transform on the DFT-spread symbols to produce symbols; and
transmit the symbols.
13 . The method of claim 11 , wherein encoding the plurality of control bits comprises tail-biting convolutional encoding.
14 . The method of claim 11 , wherein the encoded control bits are rate matched according to a number of frequency tones available for transmission.
15 . The method of claim 11 , wherein modulating the encoded control bits comprises Quadrature Phase Shift Keying.
16 . The method of claim 11 , wherein spreading the QPSK symbols comprises:
performing a modulo 24 shuffling on the spread symbols;
mapping the spread symbols into two contiguous Resource Blocks (RBs); and
spreading with an orthogonal code across a plurality of SC-FDMA symbols in a slot of a subframe.
17 . The method of claim 11 , further comprising mapping the DFT-spread symbols across the SC-FDMA symbols of a Physical Resource Block (PRB) pair in a subframe.
18 . The method of claim 17 , wherein a Physical Uplink Control Channel (PUCCH) resource index n is dynamically signaled from 0 to number of uplink RBs minus 1.
19 . The method of claim 17 , wherein a Physical Uplink Control Channel (PUCCH) resource index n is dynamically signaled from 0 to two times a number of uplink RBs minus 1.
20 . The method of claim 11 , wherein the control bits comprise Hybrid Automatic Repeat Request Acknowledgement (HARQ-ACK) bits and Channel State Information (CSI) bits, and wherein a first encoding and rate matching is applied to the HARQ-ACK bits, and a second encoding and rate matching is applied to the CSI bits.
21 . The method of claim 20 , wherein the HARQ-ACK bits are mapped to the SC-FDMA symbols adjacent a Demodulation Reference Signal (DMRS) SC-FDMA symbol in each slot of a subframe.
22 . The UE of claim 12 , wherein the UE is further configured to encode the control bits using tail-biting convolutional encoding.
23 . The UE of claim 12 , wherein the encoded control bits are rate matched according to a number of frequency tones available for transmission.
24 . The UE of claim 12 , wherein the UE is further configured to modulate the encoded control bits using Quadrature Phase Shift Keying.
25 . The UE of claim 12 , wherein the UE is further configured to:
perform a modulo 24 shuffling on the spread symbols;
map the spread symbols into two contiguous Resource Blocks (RBs); and
spread with an orthogonal code across a plurality of SC-FDMA symbols in a slot of a subframe.
26 . The UE of claim 12 , wherein the UE is further configured to map the DFT-spread symbols across the SC-FDMA symbols of a Physical Resource Block (PRB) pair in a subframe.
27 . The UE of claim 26 , wherein a Physical Uplink Control Channel (PUCCH) resource index n is dynamically signaled from 0 to number of uplink RBs minus 1.
28 . The UE of claim 26 , wherein a Physical Uplink Control Channel (PUCCH) resource index n is dynamically signaled from 0 to two times a number of uplink RBs minus 1.
29 . The UE of claim 12 , wherein the control bits comprise Hybrid Automatic Repeat Request Acknowledgement (HARQ-ACK) bits and Channel State Information (CSI) bits, and wherein a first encoding and rate matching is applied to the HARQ-ACK bits, and a second encoding and rate matching is applied to the CSI bits.
30 . The UE of claim 29 , wherein the HARQ-ACK bits are mapped to the SC-FDMA symbols adjacent a Demodulation Reference Signal (DMRS) SC-FDMA symbol in each slot of a subframe.