Communication support for low capability devices
Methods and apparatuses for transmitting and receiving signaling, by a User Equipment (UE) with reduced processing capabilities, to conserve power are provided. A method for transmitting from a network a Physical Downlink Shared CHannel (PDSCH) to a first User Equipment (UE) from a first class of UEs or to a second UE from a second class of UEs, includes transmitting a PDSCH to the first UE using a first bandwidth unit; and transmitting a PDSCH to the second UE using a second bandwidth unit, wherein the second bandwidth unit is smaller than the first bandwidth unit.
1. A method for transmitting channel state information by a first user equipment (UE) in a wireless communication system, the method comprising the steps of:
communicating with a base station; and
transmitting, to the base station, a first channel quality indicator (CQI) based on a first modulation scheme,
wherein the first UE is a machine type communication (MTC) UE, and the first modulation scheme is selected from a first set of modulation schemes, the first set of modulation schemes is different from a second set of modulation schemes used by a second UE, which is a non-MTC UE, the second UE transmitting to the base station a second CQI based on a second modulation scheme selected from the second set of modulation schemes,
wherein the first set of modulation schemes includes a quadrature phase shift keying (QPSK) scheme, and the second set of modulation schemes includes a 16 quadrature amplitude modulation (QAM) scheme, a 64 QAM scheme, and the QPSK scheme, and
wherein the first CQI is determined based on a rank 1.
2. The method of claim 1 , wherein the first CQI includes one value determined based on all narrowbands configured for a downlink control channel transmission from the base station to the first UE.
3. The method of claim 1 , wherein a rank indicator report of the first UE is omitted.
4. The method of claim 1 , wherein the first UE determines a first orthogonal frequency division multiplexing (OFDM), symbol for control information reception based on a higher layer signaling received from the base station in a broadcast channel transmitted from the base station, and the second UE determines a first OFDM symbol for control information reception based on signaling received in a physical control format indicator channel (PCFICH).
5. A first user equipment (UE) for transmitting channel state information in a wireless communication system, the first UE comprising:
a transmitter;
a receiver; and
a processor configured to control the receiver and the transmitter for communicating with a base station;
wherein the transmitter is configured to transmit, to the base station, a first channel quality indicator (CQI) based on a first modulation scheme,
wherein the first UE is a machine type communication (MTC) UE, and the first modulation scheme is selected from a first set of modulation schemes, the first set of modulation schemes is different from a second set of modulation schemes used by a second UE, which is a non-MTC UE, the second UE transmitting to the base station a second CQI based on a second modulation scheme selected from the second set of modulation schemes,
wherein the first set of modulation schemes includes a quadrature phase shift keying (QPSK) scheme, and the second set of modulation schemes includes a 16 quadrature amplitude modulation (QAM) scheme, a 64 QAM scheme, and the QPSK scheme, and
wherein the first CQI is determined based on a rank 1.
6. The first UE of claim 5 , wherein the first CQI includes one value determined based on all narrowbands configured for a downlink control channel transmission from the base station to the first UE.
7. The first UE of claim 5 , wherein a rank indicator report of the first UE is omitted.
8. The first UE of claim 5 , wherein the first UE determines a first orthogonal frequency division multiplexing (OFDM) symbol for control information reception based on a higher layer signaling received from the base station in a broadcast channel, and the second UE determines a first OFDM symbol for control information reception based on signaling received in a physical control format indicator channel (PCFICH).
9. A method for receiving channel state information by a base station in a wireless communication system, the method comprising the steps of:
communicating with each of a first user equipment (UE), which is a non-machine type communication (MTC) UE, and a second UE, which is an MTC UE;
receiving, from the first UE, a first channel quality indicator (CQI) based on a first modulation scheme; and
receiving, from the second UE, a second CQI based on a second modulation scheme,
wherein the first modulation scheme is selected from a first set of modulation schemes including a quadrature phase shift keying (QPSK) scheme, a 16 quadrature amplitude modulation (QAM) scheme and a 64 QAM scheme, and the second modulation scheme is selected from a second set of modulation schemes including the QPSK scheme, and
wherein the second CQI is determined based on a rank 1.
10. The method of claim 9 , wherein the second CQI includes one value determined based on all narrowbands configured for a downlink control channel transmission from the base station to the second UE.
11. The method of claim 9 , further comprising receiving a rank indicator (RI) report from the first UE, and
wherein a RI report of the second UE is omitted.
12. The method of claim 9 , wherein the first UE determines a first orthogonal frequency division multiplexing (OFDM) symbol for control information reception based on signaling received in a physical control format indicator channel (PCFICH), and the second UE determines a first OFDM symbol for control information reception based on a higher layer signaling received from the base station in a broadcast channel.
13. A base station for receiving channel state information in a wireless communication system, the base station comprising:
a transmitter;
a receiver; and
a processor configured to control the receiver and the transmitter for communicating with each of a first user equipment (UE), which is a non-machine type communication (MTC) UE, and a second UE, which is an MTC UE;
wherein the receiver is configured to receive, from the first UE, a first channel quality indicator (CQI) based on a first modulation scheme, and to receive, from the second UE, a second CQI based on a second modulation scheme,
wherein the first modulation scheme is selected from a first set of modulation schemes including a quadrature phase shift keying (QPSK) scheme, a 16 quadrature amplitude modulation (QAM) scheme and a 64 QAM scheme, and the second modulation scheme is selected from a second set of modulation schemes including the QPSK scheme, and
wherein the second CQI is determined based on a rank 1.
14. The base station of claim 13 , wherein the second CQI includes one value determined based on all narrowbands configured for a downlink control channel transmission from the base station to the second UE.
15. The base station of claim 13 , wherein the receiver is configured to receiving a rank indicator (RI) report from the first UE, and a RI report of the second UE is omitted.
16. The base station of claim 13 , wherein the first UE determines a first orthogonal frequency division multiplexing (OFDM) symbol for control information reception based on signaling received in a physical control format indicator channel (PCFICH), and the second UE determines a first OFDM symbol for control information reception based on a higher layer signaling received from the base station in a broadcast channel.