BACKGROUND

Technical Field

The disclosure relates to methods and devices in wireless communication systems, and in particular to a method and a device in a wireless communication system supporting multiantenna transmission.

Related Art

In Long Term Evolution (LTE) systems, codebook-based precoding is one important means to realize multiantenna transmission and it plays an important role in uplink transmission and downlink transmission. In codebook-based precoding technologies, both parties of communication need to know (partial) channel information of wireless channels. In conventional LTE systems, one most common method to acquire channel information is that a receiving end of a radio signal estimates channel state information by measuring a reference signal and then feeds back/notifies the estimated channel state information to a transmitting end of the radio signal. In New Radio (NR) systems, due to a sharp increase in the number of antennas, the channel estimation and feedback/notification overheads needed by the codebook-based precoding also increase. In order to reduce overheads and improve precoding precisions, non-codebook-based precoding is discussed in 3rd Generation Partner Project (3GPP) Radio Access Network (RAN) 1. According to the discussion results of the 3GPP RAN 1, both codebook-based precoding and non-codebook-based precoding will be supported in NR systems.

SUMMARY

The inventor finds through researches that, when a User Equipment (UE) can communicate with multiple Transmitter Receiver Points (TRPs), different TRPs may select different precoding modes, specifically, some TRPs select codebook-based precoding modes while the other TRPs select non-codebook-based precoding modes. Since the codebook-based precoding and the non-codebook-based precoding need different scheduling information, one UE that supports precoding transmissions based on both codebook and non-codebook will have increased complexity in blind detection of scheduling signalings.

In view of the above problems, the disclosure provides a solution. It should be noted that the embodiments of the UE of the disclosure and the characteristics in the embodiments may be applied to the base station if no conflict is incurred, and vice versa. The embodiments of the disclosure and the characteristics in the embodiments may be mutually combined arbitrarily if no conflict is incurred.

The disclosure provides a method in a UE for wireless communication, comprising:

receiving first information;

receiving a first signaling; and

transmitting a first radio signal.

Herein, the first information is used for determining a first air interface resource and a second air interface resource, and the first signaling includes scheduling information of the first radio signal; in instances in which the first radio signal is related to the first air interface resource, the scheduling information of the first radio signal is codebook-based; in instances in which the first radio signal is related to the second air interface resource, the scheduling information of the first radio signal is non-codebook-based; the first air interface resource includes at least one of M1 antenna port group(s) and a first time-frequency resource set, and the second air interface resource includes at least one of M2 antenna port group(s) and a second time-frequency resource set; one antenna port group includes a positive integer number of antenna port(s), one time-frequency resource set includes a positive integer number of time-frequency resource(s), the M1 and the M2 are positive integers respectively.

According to one aspect of the disclosure, the first air interface resource and the second air interface resource include the first time-frequency resource set and the second time-frequency resource set respectively; when the first radio signal is related to the first air interface resource, time-frequency resources occupied by the first signaling belong to the first time-frequency resource set; and when the first radio signal is related to the second air interface resource, time-frequency resources occupied by the first signaling belong to the second time-frequency resource set.

According to one aspect of the disclosure, the first air interface resource and the second air interface resource include the first time-frequency resource set and the second time-frequency resource set respectively; when the first radio signal is related to the first air interface resource, time-frequency resources occupied by the first radio signal belong to the first time-frequency resource set; and when the first radio signal is related to the second air interface resource, time-frequency resources occupied by the first radio signal belong to the second time-frequency resource set.

According to one aspect of the disclosure, the first air interface resource and the second air interface resource include the M1 antenna port group(s) and the M2 antenna port group(s) respectively; when the first radio signal is related to the first air interface resource, at least one transmitting antenna port of the first signaling is QCLed with one antenna port in the M1 antenna port group(s); when the first radio signal is related to the second air interface resource, at least one transmitting antenna port of the first signaling is QCLed with one antenna port in the M2 antenna port group(s).

According to one aspect of the disclosure, the first air interface resource and the second air interface resource include the M1 antenna port group(s) and the M2 antenna port group(s) respectively; when the first radio signal is related to the first air interface resource, at least one transmitting antenna port of the first radio signal is QCLed with one antenna port in the M1 antenna port group(s); when the first radio signal is related to the second air interface resource, at least one transmitting antenna port of the first radio signal is QCLed with one antenna port in the M2 antenna port group(s).

According to one aspect of the disclosure, when the scheduling information of the first radio signal is codebook-based, the first signaling includes a first field; when the scheduling information of the first radio signal is non-codebook-based, the first signaling does not include a first field; the first field is used for determining K1 codeword(s) from a first codebook, and the K1 codeword(s) is(are) used for determining a transmitting antenna port(s) of the first radio signal; the first codebook includes a positive integer number of codewords; and the K1 is a positive integer.

According to one aspect of the disclosure, the first signaling includes a second field, the second field is used for determining K2 target antenna port group(s), any one transmitting antenna port of the first radio signal is QCLed with one antenna port in the K2 target antenna port group(s), and the K2 is a positive integer.

The disclosure provides a method in a base station for wireless communication, wherein the method includes:

transmitting first information;

transmitting a first signaling; and

receiving a first radio signal.

Herein, the first information is used for determining a first air interface resource and a second air interface resource, and the first signaling includes scheduling information of the first radio signal; in instances in which the first radio signal is related to the first air interface resource, the scheduling information of the first radio signal is codebook-based; in instances in which the first radio signal is related to the second air interface resource, the scheduling information of the first radio signal is non-codebook-based; the first air interface resource includes at least one of M1 antenna port group(s) and a first time-frequency resource set, and the second air interface resource includes at least one of M2 antenna port group(s) and a second time-frequency resource set; one antenna port group includes a positive integer number of antenna port(s), one time-frequency resource set includes a positive integer number of time-frequency resource(s), the M1 and the M2 are positive integers respectively.

According to one aspect of the disclosure, the first air interface resource and the second air interface resource include the first time-frequency resource set and the second time-frequency resource set respectively; when the first radio signal is related to the first air interface resource, time-frequency resources occupied by the first signaling belong to the first time-frequency resource set; and when the first radio signal is related to the second air interface resource, time-frequency resources occupied by the first signaling belong to the second time-frequency resource set.

According to one aspect of the disclosure, the first air interface resource and the second air interface resource include the first time-frequency resource set and the second time-frequency resource set respectively; when the first radio signal is related to the first air interface resource, time-frequency resources occupied by the first radio signal belong to the first time-frequency resource set; and when the first radio signal is related to the second air interface resource, time-frequency resources occupied by the first radio signal belong to the second time-frequency resource set.

According to one aspect of the disclosure, the first air interface resource and the second air interface resource include the M1 antenna port group(s) and the M2 antenna port group(s) respectively; when the first radio signal is related to the first air interface resource, at least one transmitting antenna port of the first signaling is QCLed with one antenna port in the M1 antenna port group(s); when the first radio signal is related to the second air interface resource, at least one transmitting antenna port of the first signaling is QCLed with one antenna port in the M2 antenna port group(s);

According to one aspect of the disclosure, the first air interface resource and the second air interface resource include the M1 antenna port group(s) and the M2 antenna port group(s) respectively; when the first radio signal is related to the first air interface resource, at least one transmitting antenna port of the first radio signal is QCLed with one antenna port in the M1 antenna port group(s); when the first radio signal is related to the second air interface resource, at least one transmitting antenna port of the first radio signal is QCLed with one antenna port in the M2 antenna port group(s).

According to one aspect of the disclosure, when the scheduling information of the first radio signal is codebook-based, the first signaling includes a first field; when the scheduling information of the first radio signal is non-codebook-based, the first signaling does not include a first field; the first field is used for determining K1 codeword(s) from a first codebook, and the K1 codeword(s) is(are) used for determining a transmitting antenna port(s) of the first radio signal; the first codebook includes a positive integer number of codewords; and the K1 is a positive integer.

According to one aspect of the disclosure, the first signaling includes a second field, the second field is used for determining K2 target antenna port group(s), any one transmitting antenna port of the first radio signal is QCLed with one antenna port in the K2 target antenna port group(s), and the K2 is a positive integer.

The disclosure provides a UE for wireless communication, wherein the UE includes:

a first receiver, to receive first information;

a second receiver, to receive a first signaling; and

a first transmitter, to transmit a first radio signal.

Herein, the first information is used for determining a first air interface resource and a second air interface resource, and the first signaling includes scheduling information of the first radio signal; in instances in which the first radio signal is related to the first air interface resource, the scheduling information of the first radio signal is codebook-based; in instances in which the first radio signal is related to the second air interface resource, the scheduling information of the first radio signal is non-codebook-based; the first air interface resource includes at least one of M1 antenna port group(s) and a first time-frequency resource set, and the second air interface resource includes at least one of M2 antenna port group(s) and a second time-frequency resource set; one antenna port group includes a positive integer number of antenna port(s), one time-frequency resource set includes a positive integer number of time-frequency resource(s), the M1 and the M2 are positive integers respectively.

In one embodiment, the above UE for wireless communication is characterized in that: the first air interface resource and the second air interface resource include the first time-frequency resource set and the second time-frequency resource set respectively; when the first radio signal is related to the first air interface resource, time-frequency resources occupied by the first signaling belong to the first time-frequency resource set; and when the first radio signal is related to the second air interface resource, time-frequency resources occupied by the first signaling belong to the second time-frequency resource set.

In one embodiment, the above UE for wireless communication is characterized in that: the first air interface resource and the second air interface resource include the first time-frequency resource set and the second time-frequency resource set respectively; when the first radio signal is related to the first air interface resource, time-frequency resources occupied by the first radio signal belong to the first time-frequency resource set; and when the first radio signal is related to the second air interface resource, time-frequency resources occupied by the first radio signal belong to the second time-frequency resource set.

In one embodiment, the above UE for wireless communication is characterized in that: the first air interface resource and the second air interface resource include the M1 antenna port group(s) and the M2 antenna port group(s) respectively; when the first radio signal is related to the first air interface resource, at least one transmitting antenna port of the first signaling is QCLed with one antenna port in the M1 antenna port group(s); when the first radio signal is related to the second air interface resource, at least one transmitting antenna port of the first signaling is QCLed with one antenna port in the M2 antenna port group(s).

In one embodiment, the above UE for wireless communication is characterized in that: the first air interface resource and the second air interface resource include the M1 antenna port group(s) and the M2 antenna port group(s) respectively; when the first radio signal is related to the first air interface resource, at least one transmitting antenna port of the first radio signal is QCLed with one antenna port in the M1 antenna port group(s); when the first radio signal is related to the second air interface resource, at least one transmitting antenna port of the first radio signal is QCLed with one antenna port in the M2 antenna port group(s).

In one embodiment, the above UE for wireless communication is characterized in that: when the scheduling information of the first radio signal is codebook-based, the first signaling includes a first field; when the scheduling information of the first radio signal is non-codebook-based, the first signaling does not include a first field; the first field is used for determining K1 codeword(s) from a first codebook, and the K1 codeword(s) is(are) used for determining a transmitting antenna port(s) of the first radio signal; the first codebook includes a positive integer number of codewords; and the K1 is a positive integer.

In one embodiment, the above UE for wireless communication is characterized in that: the first signaling includes a second field, the second field is used for determining K2 target antenna port group(s), any one transmitting antenna port of the first radio signal is QCLed with one antenna port in the K2 target antenna port group(s), and the K2 is a positive integer.

The disclosure provides a base station for wireless communication, wherein the base station includes:

a second transmitter, to transmit first information;

a third transmitter, to transmit a first signaling; and

a third receiver, to a first radio signal.

Herein, the first information is used for determining a first air interface resource and a second air interface resource, and the first signaling includes scheduling information of the first radio signal; in instances in which the first radio signal is related to the first air interface resource, the scheduling information of the first radio signal is codebook-based; in instances in which the first radio signal is related to the second air interface resource, the scheduling information of the first radio signal is non-codebook-based; the first air interface resource includes at least one of M1 antenna port group(s) and a first time-frequency resource set, and the second air interface resource includes at least one of M2 antenna port group(s) and a second time-frequency resource set; one antenna port group includes a positive integer number of antenna port(s), one time-frequency resource set includes a positive integer number of time-frequency resource(s), the M1 and the M2 are positive integers respectively.

In one embodiment, the above base station for wireless communication is characterized in that: the first air interface resource and the second air interface resource include the first time-frequency resource set and the second time-frequency resource set respectively; when the first radio signal is related to the first air interface resource, time-frequency resources occupied by the first signaling belong to the first time-frequency resource set; and when the first radio signal is related to the second air interface resource, time-frequency resources occupied by the first signaling belong to the second time-frequency resource set.

In one embodiment, the above base station for wireless communication is characterized in that: the first air interface resource and the second air interface resource include the first time-frequency resource set and the second time-frequency resource set respectively; when the first radio signal is related to the first air interface resource, time-frequency resources occupied by the first radio signal belong to the first time-frequency resource set; and when the first radio signal is related to the second air interface resource, time-frequency resources occupied by the first radio signal belong to the second time-frequency resource set.

In one embodiment, the above base station for wireless communication is characterized in that: the first air interface resource and the second air interface resource include the M1 antenna port group(s) and the M2 antenna port group(s) respectively; when the first radio signal is related to the first air interface resource, at least one transmitting antenna port of the first signaling is QCLed with one antenna port in the M1 antenna port group(s); when the first radio signal is related to the second air interface resource, at least one transmitting antenna port of the first signaling is QCLed with one antenna port in the M2 antenna port group(s);

In one embodiment, the above base station for wireless communication is characterized in that: the first air interface resource and the second air interface resource include the M1 antenna port group(s) and the M2 antenna port group(s) respectively; when the first radio signal is related to the first air interface resource, at least one transmitting antenna port of the first radio signal is QCLed with one antenna port in the M1 antenna port group(s); when the first radio signal is related to the second air interface resource, at least one transmitting antenna port of the first radio signal is QCLed with one antenna port in the M2 antenna port group(s).

In one embodiment, the above base station for wireless communication is characterized in that: when the scheduling information of the first radio signal is codebook-based, the first signaling includes a first field; when the scheduling information of the first radio signal is non-codebook-based, the first signaling does not include a first field; the first field is used for determining K1 codeword(s) from a first codebook, and the K1 codeword(s) is(are) used for determining a transmitting antenna port(s) of the first radio signal; the first codebook includes a positive integer number of codewords; and the K1 is a positive integer.

In one embodiment, the above base station for wireless communication is characterized in that: the first signaling includes a second field, the second field is used for determining K2 target antenna port group(s), any one transmitting antenna port of the first radio signal is QCLed with one antenna port in the K2 target antenna port group(s), and the K2 is a positive integer.

In one embodiment, compared with conventional schemes, the disclosure has the following benefits.

One UE can support both codebook-based precoding and non-codebook-based precoding. When multiple TRP serve one UE simultaneously, each TRP can select an optimal precoding mode depending on its own actual condition, thus transmission qualities between each TRP and the UE are fully optimized.

Whether a signaling format of a scheduling signaling is a signaling format corresponding to codebook-based precoding or a signaling format corresponding to non-codebook-based precoding may be determined according to a CORESET or a search space where the scheduling signaling is located or a transmitting beam employed by a control channel where the scheduling signaling is located; in one CORESET or search space, it is needed to perform a blind detection of a scheduling signaling format corresponding to one precoding mode only, thus the complexity of blind detection of the UE is reduced.

