Method and apparatus for PUCCH coverage enhancement
Embodiments of the present disclosure provide methods, apparatus and computer program products for transmitting and receiving an uplink signal on physical control channel. A method comprises: determining that a terminal device has a capability of transmitting the uplink signal on physical control channel in at least a first time instant and a second time instant coherently; performing a first transmission of the uplink signal on physical control channel in the first time instant in a first set of subcarriers; and performing a second transmission of the uplink signal on physical control channel in the second time instant in a second set of subcarriers.
1. A method for transmitting an uplink signal on physical control channel, the method comprising:
determining that a terminal device has a capability of transmitting the uplink signal on physical control channel in at least a first time instant and a second time instant coherently;
performing a first transmission of the uplink signal on physical control channel in the first time instant in a first set of subcarriers; and
performing a second transmission of the uplink signal on physical control channel in the second time instant in a second set of subcarriers; wherein the capability of transmitting the uplink signal on physical control channel in at least the first time instant and the second time instant coherently is determined based on at least one of the following:
whether the first time instant and the second time instant are consecutive;
a change in transmission power between the first time instant and the second time instant:
a frequency offset between a central frequency of the first set of subcarriers and a central frequency of the second set of subcarriers; and
an uplink spatial relation between uplink control channel transmissions in the first time instant and the second time instant.
2. The method according to claim 1 , wherein the second transmission of the uplink signal on physical control channel is a repetition of the first transmission of the uplink signal on physical control channel.
3. The method according to claim 1 , wherein the capability of transmitting the uplink signal on physical control channel in at least the first time instant and the second time instant coherently comprises a capability of transmitting the uplink signal on physical control channel in at least the first time instant and the second time instant with a phase-related difference lower than a threshold.
4. The method according to claim 1 , further comprising:
indicating to a network node that the terminal device has the capability of transmitting the uplink signal on physical control channel in at least the first time instant and the second time instant coherently.
5. The method according to claim 1 , wherein each of the first time instant and the second time instant comprises:
one or more slots; and/or
one or more sub-slots; and/or
one or more multiple-slots.
6. The method according to claim 1 , wherein the second time instant immediately follows the first time instant.
7. The method according to claim 1 , further comprising:
indicating to a network node of a number of time instants in which the terminal device has the capability of transmitting the uplink signal on physical control channel coherently.
8. The method according to claim 1 , further comprising:
receiving from a network node an indication indicating in which time instant and/or for how many time instants the terminal device has the capability of transmitting the uplink signal on physical control channel coherently.
9. The method according to claim 1 , further comprising:
receiving from a network node an indication indicating between which hops of a frequency hopping pattern the terminal device has the capability of transmitting the uplink signal on physical control channel coherently.
10. The method according to claim 1 , wherein the capability of transmitting the uplink signal on physical control channel in at least the first time instant and the second time instant coherently has one or more capability levels, and a number of time instants in which the terminal device has the capability is defined for each capability level.
11. The method according to claim 10 , wherein the number of time instants is defined for each capability level according to one or more of the following parameters:
a numerology of an uplink control channel;
a demodulation reference signal configuration of the uplink signal on physical control channel;
a number of repetitions of the uplink signal on physical control channel;
a format of the uplink signal on physical control channel;
a number of orthogonal frequency division multiplexing, OFDM, symbols of the uplink signal on physical control channel in one slot;
whether a resource allocated to the uplink signal on physical control channel is a dedicated or common resource; and
a type of frequency hopping.
12. The method according to claim 1 , wherein a same hopping frequency is used in the first time instant and the second time instant when a frequency hopping is enabled.
13. The method according to claim 1 , further comprising:
determining a frequency hopping pattern for the terminal device, and
wherein the capability of transmitting the uplink signal on physical control channel in at least the first time instant and the second time instant coherently is determined based on the frequency hopping pattern.
14. The method according to claim 1 , wherein the terminal device is capable of keeping coherence in transmission in at least the first time instant and the second time instant.
15. A method for receiving an uplink signal on physical control channel, the method comprising:
determining that a terminal device has a capability of transmitting the uplink signal on physical control channel in at least a first time instant and a second time instant coherently;
receiving from the terminal device, a first transmission of the uplink signal on physical control channel in the first time instant in a first set of subcarriers; and
receiving from the terminal device, a second transmission of the uplink signal on physical control channel in the second time instant in a second set of subcarriers; wherein the capability of transmitting the uplink signal on physical control channel in at least the first time instant and the second time instant coherently is determined based on at least one of the following:
whether the first time instant and the second time instant are consecutive;
a change in transmission power between the first time instant and the second time instant:
a frequency offset between a central frequency of the first set of subcarriers and a central frequency of the second set of subcarriers; and
an uplink spatial relation between uplink control channel transmissions in the first time instant and the second time instant.
16. The method according to claim 15 , wherein the second transmission of the uplink signal on physical control channel is a repetition of the first transmission of the uplink signal on physical control channel.
17. The method according to claim 15 , further comprising:
performing channel estimation by coherently combining the first transmission of the uplink signal on physical control channel and the second transmission of the uplink signal on physical control channel.
18. The method according to claim 15 , wherein the capability of transmitting the uplink signal on physical control channel in at least the first time instant and the second time instant coherently comprises a capability of transmitting the uplink signal on physical control channel in at least the first time instant and the second time instant with a phase-related difference lower than a threshold.
19. An apparatus for transmitting an uplink signal on physical control channel, the apparatus comprising:
one or more processors; and
one or more memories comprising computer program codes,
the one or more memories and the computer program codes configured to, with the one or more processors, cause the apparatus to:
determine that a terminal device has a capability of transmitting the uplink signal on physical control channel in at least a first time instant and a second time instant coherently;
perform a first transmission of the uplink signal on physical control channel in the first time instant in a first set of subcarriers; and
perform a second transmission of the uplink signal on physical control channel in the second time instant in a second set of subcarriers; wherein the capability of transmitting the uplink signal on physical control channel in at least the first time instant and the second time instant coherently is determined based on at least one of the following:
whether the first time instant and the second time instant are consecutive;
a change in transmission power between the first time instant and the second time instant;
a frequency offset between a central frequency of the first set of subcarriers and a central frequency of the second set of subcarriers; and
an uplink spatial relation between uplink control channel transmissions in the first time instant and the second time instant.