Method and apparatus for transceiving data via a contention-based physical uplink data channel
Disclosed are a method and apparatus for transceiving data via a contention based physical uplink data channel. A terminal apparatus, which transmits data via a contention based physical uplink data channel, comprises: a transmitter which transmits data via a contention based physical uplink data channel and scheduling request information via a scheduling request channel simultaneously or consecutively to a base station; a receiver which receives a physical hybrid-ARQ indicator channel (PHICH) or an uplink (UL) grant message from the base station; and a processor which decodes the physical hybrid-ARQ indicator channel (PHICH) or the uplink (UL) grant message to determine whether an ACK signal or a NACK signal is indicated. Here, the scheduling request channel can be a specific channel allocated to the terminal apparatus so as to discriminate the terminal from other terminal apparatuses.
1. A method for receiving data by a base station (BS) through a contention based physical uplink data channel, the method comprising:
receiving, by the BS from one or more user equipment, data through the contention based physical uplink data channel and scheduling request information through a scheduling request channel, the scheduling request channel being separately allocated to each of the one or more user equipment;
decoding, by the BS, the received data; and
if the received data are successfully decoded, transmitting, through an uplink grant message including uplink resource allocation information or through a physical hybrid-ARQ indicator channel (PHICH), an ACK signal to the one or more user equipment which transmitted the scheduling request information,
wherein a position of a resource to which the PHICH is mapped is determined based on at least one of
a cyclic shift value of a demodulation reference signal included in the contention based physical uplink data channel, or
a physical resource block (PRB) index of the contention based physical uplink data channel.
2. The method according to claim 1 , further comprising:
performing blind detection per a predefined data transmission unit of the data.
3. The method according to claim 1 , wherein the contention based physical uplink data channel includes a plurality of data transmission units.
4. The method according to claim 1 , wherein the ACK signal is transmitted through a specific indicator or a field within the uplink grant message.
5. The method according to claim 4 , wherein the ACK signal or a NACK signal is indicated by toggling of the specific indicator.
6. The method according to claim 1 , wherein the contention based uplink data channel is a channel where frequency hopping is performed in a slot unit.
7. A method for transmitting data by a user equipment (UE) through a contention based physical uplink data channel, the method comprising:
transmitting, by the UE to a base station (BS), data through the contention based physical uplink data channel and scheduling request information through a scheduling request channel, the scheduling request channel being separately allocated to the user equipment; and
receiving, by the UE from the BS, an ACK signal or a NACK signal through a physical hybrid-ARQ indicator channel (PHICH) or through an uplink grant message, the ACK signal or the NACK signal indicating whether the data have been successfully decoded,
wherein the ACK signal or the NACK signal is received through a specific indicator or a field within the uplink grant (UL grant) message, and
wherein a position of a resource to which the PHICH is mapped is determined based on at least one of
a cyclic shift value of a demodulation reference signal included in the contention based physical uplink data channel, or
a physical resource block (PRB) index of the contention based physical uplink data channel.
8. The method according to claim 7 , wherein the ACK signal or the NACK signal is indicated by toggling of the specific indicator.
9. The method according to claim 7 , wherein the contention based uplink data channel is a channel where frequency hopping is performed in a slot unit.
10. A base station apparatus for receiving data through a contention based physical uplink data channel, the base station apparatus comprising:
a receiver;
a transmitter; and
a processor operatively connected to the receiver and the transmitter, the processor configured to
receive, from one or more user equipment, data through the contention based physical uplink data channel and scheduling request information through a scheduling request channel, the scheduling request channel being separately allocated to each of the one or more user equipment;
decode the received data and
if the received data are successfully decoded, transmit, through an uplink grant message including uplink resource allocation information or through a physical hybrid-ARQ indicator channel (PHICH), an ACK signal to the one or more user equipment which transmitted the scheduling request information,
wherein a position of a resource to which the PHICH is mapped is determined based on at least one of
a cyclic shift value of a demodulation reference signal included in the contention based physical uplink data channel, or
a physical resource block (PRB) index of the contention based physical uplink data channel.
11. The base station apparatus according to claim 10 , wherein the processor is further configured to perform blind detection per a predefined data transmission unit of the data.
12. A user equipment apparatus for transmitting data through a contention based physical uplink data channel, the user equipment comprising:
a transmitter;
a receiver; and
a processor operatively connected to the receiver and the transmitter, the processor configured to
transmit, to a base station (BS), data through the contention based physical uplink data channel and scheduling request information through a scheduling request channel, the scheduling request channel being separately allocated to the user equipment; and
receiving, from the BS, an ACK signal or a NACK signal through a physical hybrid-ARQ indicator channel (PHICH) or through an uplink grant message, the ACK signal or the NACK signal indicating whether the data have been successfully decoded,
wherein the ACK signal is received through a specific indicator or a field within the uplink grant (UL grant) message, and
wherein a position of a resource to which the PHICH is mapped is determined based on at least one of
a cyclic shift value of a demodulation reference signal included in the contention based physical uplink data channel, or
a physical resource block (PRB) index of the contention based physical uplink data channel.