CN107547118B

CN107547118B - Method and device in wireless communication

Info

Publication number: CN107547118B
Application number: CN201610493535.6A
Authority: CN
Inventors: 张晓博
Original assignee: Shanghai Langbo Communication Technology Co Ltd
Current assignee: Shanghai Langbo Communication Technology Co Ltd
Priority date: 2016-06-29
Filing date: 2016-06-29
Publication date: 2020-07-31
Anticipated expiration: 2036-06-29
Also published as: CN111769854A; CN107547118A

Abstract

The invention provides a method and a device in wireless communication. The UE firstly receives a first wireless signal; and then transmits a second wireless signal. Wherein the first wireless signal is used to determine P, which is a positive integer. The second wireless signal includes P sub-signals, which carry the same information. Time domain resources or frequency domain resources occupied by any two of the P sub-signals are orthogonal. The P sub-signals are respectively transmitted by P antenna port groups, and the antenna port group includes 1 or a plurality of antenna ports. The receiver of the second wireless signal cannot assume that the P sub-signals are transmitted by the same antenna port group. The invention enables the UE to maintain the robustness of uplink transmission. Furthermore, the invention supports the beam forming and the beam sweeping with different precisions, and meets the requirements of different services.

Description

Method and device in wireless communication

Technical Field

The invention relates to a method and a device for multi-antenna transmission in the technical field of mobile communication, in particular to a wireless communication scheme in a scene that a large number of antennas are deployed at a base station side.

Background

Large scale (Massive) MIMO has become a research hotspot for next generation mobile communications. In large-scale MIMO, multiple antennas form a narrow beam pointing to a specific direction by beamforming to improve communication quality. The beam formed by multi-antenna beamforming is generally narrow, and both communication parties need to obtain partial channel information of the other party to enable the formed beam to point to the correct direction. Reliable wireless transmission becomes a problem until both communication parties obtain partial channel information of the other party.

The present invention discloses a solution to the above problems. It should be noted that, without conflict, the embodiments and features in the embodiments in the UE (User Equipment) of the present application may be applied to the base station, and vice versa. Further, the embodiments and features of the embodiments of the present application may be arbitrarily combined with each other without conflict.

Disclosure of Invention

The inventor finds, through research, that when a UE (User Equipment) does not obtain CSI (Channel state Information) of an uplink Channel, the UE needs to use a larger redundancy to ensure correct reception of a transmitted signal, such as a Beam Sweeping (Beam Sweeping) scheme, that is, the UE transmits the same signal multiple times in a TDM (time division multiplexing) manner, and transmits a Beam for a different direction each time. After the UE obtains (part of) CSI of the uplink channel, the UE may use beamforming to reduce redundancy, improve transmission efficiency, and ensure reception quality of the transmitted signal.

According to the above analysis, the present invention discloses a method used in a UE for multi-antenna transmission, wherein the method comprises the following steps:

-step a. receiving a first wireless signal;

-step b. transmitting a second radio signal;

wherein the first wireless signal is used to determine P, which is a positive integer. The second wireless signal includes P sub-signals, which carry the same information. Time domain resources or frequency domain resources occupied by any two of the P sub-signals are orthogonal. The P sub-signals are respectively transmitted by P antenna port groups, and the antenna port group includes 1 or a plurality of antenna ports. The receiver of the second wireless signal cannot assume that the P sub-signals are transmitted by the same antenna port group.

As one embodiment, the first wireless signal implicitly indicates the P. As a sub-embodiment of the present embodiment, the first wireless signal includes { first signaling, first data }, the first signaling includes scheduling information of the first data, and the sub-signal indicates whether the first data is correctly decoded. And a signaling identifier corresponding to the first signaling is used for determining the P, and the signaling identifier is a positive integer. As an embodiment, the first signaling is DCI (downlink control Information), the signaling Identifier of the first signaling is RA (Random Access) -RNTI (Radio Network Temporary Identifier), and P is greater than 1. As an embodiment, the first signaling is DCI, the signaling identifier of the first signaling is C (Cell ) -RNTI, and P is equal to 1.

As an embodiment, the scheduling information includes at least one of { occupied time-frequency resource, MCS (Modulation and coding Status), RV (Redundancy Version), and HARQ Process Number (Process Number) }.

As one embodiment, the first wireless signal explicitly indicates the P. As a sub-embodiment of this embodiment, one information bit in the first wireless signal indicates whether P is 1 or P1, and the P1 is greater than 1. As an example, the P1 is a fixed constant. For one embodiment, the P1 is configurable.

As an embodiment, time domain resources occupied by any two of the P sub-signals are orthogonal (i.e. do not overlap in time domain).

As an embodiment, the sub-signal includes UCI (Uplink Control Information), and the UCI includes at least one of { HARQ-ACK/NACK, SR (Scheduling Requests), CQI (channel quality Indicator) feedback, RI (Rank Indicator) feedback, PMI (Precoding Matrix Indicator), CRI (CSI-RS Resource Indicator).

As an embodiment, the physical layer channel corresponding to the first wireless signal includes a downlink physical layer control channel (i.e., a downlink channel that can only be used for carrying physical layer signaling). As an embodiment, the Downlink Physical layer Control Channel is a PDCCH (Physical Downlink Control Channel)

As an embodiment, the physical layer channel corresponding to the first wireless signal includes a downlink physical layer data channel (i.e. a downlink channel capable of carrying physical layer data). As an embodiment, the Downlink Physical layer data Channel is a PDSCH (Physical Downlink Shared Channel).

As an embodiment, the transmission channel corresponding to the first wireless signal is D L-SCH (Downlink shared channel).

For one embodiment, the first wireless signal further includes physical layer data.

As an embodiment, the physical layer channel corresponding to the second wireless signal includes an uplink physical layer control channel (i.e. an uplink channel that can only be used for carrying physical layer signaling). As an embodiment, the Uplink Physical layer Control Channel is a PUCCH (Physical Uplink Control Channel).

As an embodiment, the physical layer channel corresponding to the second wireless signal includes an uplink physical layer data channel (i.e. an uplink channel capable of carrying physical layer data). As an embodiment, the Uplink Physical layer data Channel is a PUSCH (Physical Uplink Shared Channel).

As an embodiment, the transmission channel corresponding to the second wireless signal is U L-SCH (Uplink shared channel).

As an embodiment, the antenna port group includes 1 antenna port.

As an embodiment, there are at least two antenna port groups in the P antenna port groups, and the number of the antenna ports included in the two antenna port groups is different.

As an embodiment, the number of antenna ports included in the P antenna port groups is the same.

As an example, the receiver of the second wireless signal cannot assume that the P sub-signals are transmitted by the same antenna port group, which means: the small scale characteristics of the wireless channel experienced by the signal transmitted by the first antenna port cannot be used by the receiver of the second wireless signal to infer the small scale characteristics of the wireless channel experienced by the signal transmitted by the second antenna port. The first antenna port and the second antenna port respectively belong to two different antenna port groups of the P antenna port groups, and the small-scale characteristic includes channel impulse response.

As an embodiment, the antenna port is formed by superimposing a plurality of antennas through antenna Virtualization (Virtualization), and mapping coefficients of the plurality of antennas to the antenna port form a beamforming vector. The receiver of the second wireless signal cannot assume that the P sub-signals are transmitted by the same antenna port group, which means: the beamforming vectors corresponding to any two antenna ports in the P antenna port groups cannot be assumed to be the same.

In the above embodiment, different antenna ports may use different beamforming vectors to transmit the second wireless signal, and the different beamforming vectors respectively point to different directions. When the UE has not obtained CSI of an uplink channel, the base station may instruct the UE to transmit the second signal in different beamforming directions on P >1 antenna port groups, thereby enhancing transmission reliability of the second wireless signal. After the UE obtains CSI of (part of) uplink channels, the base station may instruct the UE to transmit the second wireless signal through a specific beamforming vector on the antenna port group with P ═ 1, so as to reduce transmission redundancy, improve transmission efficiency, and ensure transmission reliability of the second wireless signal.

As an example, the receiver of the second wireless signal cannot assume that the P sub-signals are transmitted by the same antenna port group, which means: the receiver of the second wireless signal does not perform joint channel estimation using wireless signals transmitted by any two antenna ports of the P antenna port groups.

As an embodiment, the beamforming vector corresponding to the antenna port is formed by a product of an analog beamforming matrix and a digital beamforming vector. As a sub-embodiment, the P antenna port groups respectively correspond to P analog beamforming matrices, and antenna ports in the same antenna port group correspond to the same analog beamforming matrix. As a sub-embodiment, the analog beamforming matrices for the antenna ports in different antenna port groups are different. As a sub-embodiment, different antenna ports in the same antenna port group correspond to different digital beamforming vectors.

In the above embodiment, the same analog beamforming matrix corresponding to the antenna ports in the same antenna port group is used to form a same wide beam on the antenna ports in the same antenna port group; and different digital beam forming vectors corresponding to the antenna ports in the same antenna port group are used for forming different narrow beams positioned in the wide beam on the antenna ports in the same antenna port group. In this way, the UE can flexibly perform beam sweeping at two different accuracies. The base station may perform the selection of the wide beam by measuring wireless signals transmitted by different sets of the antenna ports; the base station may also perform the selection of the narrow beam within the corresponding wide beam by measuring wireless signals transmitted by different antenna ports within the same antenna port group. In this way, the base station can flexibly assist the UE to support two different accuracies of beamforming.

As an embodiment, different antenna ports in the same antenna port group transmit the second wireless signal in a TDM (time division Multiplexing) manner.

As an embodiment, different antenna ports in the same antenna port group transmit the second wireless signal in an FDM (frequency division Multiplexing) manner.

As an embodiment, different antenna ports in the same antenna port group transmit the second wireless signal in a CDM (code division Multiplexing) manner.

As an embodiment, different antenna ports within the same antenna port group transmit the second wireless signal in a transmit diversity manner. As a sub-embodiment, the transmit diversity is SFBC (Space frequency block Coding). As a sub-embodiment, the transmit diversity is STBC (Space Time block coding).

Specifically, according to an aspect of the present invention, the step a further includes the steps of:

step A0. receiving first higher layer signaling, said first higher layer signaling indicating P1.

Wherein P is 1, or P is P1. The P1 is a positive integer greater than 1.

As an embodiment, the first higher layer signaling is RRC (Radio Resource Control) signaling.

As an embodiment, the first higher layer signaling is cell specific.

As an embodiment, the first higher layer signaling is UE specific.

Specifically, according to one aspect of the present invention, the method further comprises the following steps:

-step c. receiving a third wireless signal;

-step d. transmitting a fourth radio signal;

wherein the third wireless signal is used to determine at least one of { target antenna port group, T first vectors }. The target antenna port group is one of the P antenna port groups, and the fourth wireless signal is transmitted by T antenna ports, wherein the target antenna port group is used for antenna virtualization of the T antenna ports, or the T first vectors are respectively used for antenna virtualization of the T antenna ports. The T is a positive integer.

As an embodiment, the second wireless signal includes P RS port groups, the P RS port groups respectively correspond to the P antenna port groups one to one, the number of RS ports in the RS port group is the same as the number of antenna ports in the corresponding antenna port group, the RS ports in the RS port group correspond to the antenna ports in the corresponding antenna port group one to one, and the RS ports are transmitted by the corresponding antenna ports. In one embodiment, the RS sequence corresponding to the RS port is a Zadoff-Chu sequence. As an embodiment, an RU (Resource Unit) occupied by the RS port is discontinuous in a frequency domain, and occupies a duration of one OFDM symbol in a time domain and occupies a bandwidth of one subcarrier interval in the frequency domain. As an embodiment, the RU is a RE (Resource Element). As an embodiment, the frequency domain spacing between adjacent RUs occupied by the RS ports is the same. As an embodiment, the RS sequences corresponding to different RS ports included in the same RS port group are different. As an embodiment, the RS sequences corresponding to different RS ports included in the same RS port group are mutually orthogonal.

As an embodiment, the pattern of the RS ports inside one time-frequency block is a pattern of SRS inside one time-frequency block, the time-frequency block occupies one OFDM duration in the time domain, and occupies no more than 20MHz (megahertz) in the frequency domain. As an embodiment, the bandwidth occupied by the RS port in the frequency domain includes the bandwidth of a plurality of the time-frequency blocks in the frequency domain.

As an embodiment, the third wireless signal is transmitted on a downlink physical layer control channel. As an embodiment, the downlink physical layer control channel is a PDCCH.

As an embodiment, the third wireless signal is transmitted on a downlink physical layer data channel. As an embodiment, the downlink physical layer data channel is a PDSCH.

For one embodiment, the transmission channel corresponding to the third wireless signal is D L-SCH.

For one embodiment, the third wireless signal further includes physical layer data.

For one embodiment, the fourth wireless signal includes an uplink physical layer control channel. In one embodiment, the uplink physical layer control channel is a PUCCH.

For one embodiment, the fourth wireless signal includes an uplink physical layer data channel. As an embodiment, the uplink physical layer data channel is a PUSCH.

For one embodiment, the transmission channel corresponding to the fourth wireless signal is U L-SCH.

For one embodiment, the fourth wireless signal further includes physical layer data.

Specifically, according to one aspect of the present invention, the third wireless signal indicates a target antenna port group and a precoding matrix, the precoding matrix includes T second vectors, and the second vectors include Q elements. The T first vectors and the T second vectors are in one-to-one correspondence. The target antenna port group comprises Q antenna ports, and beam forming vectors corresponding to the Q antenna ports are respectively multiplied by the Q elements in the second vector and then added to form the corresponding first vector. Q is a positive integer greater than 1.

As an embodiment, any two of the T second vectors are different from each other.

As an embodiment, any two of the T second vectors are orthogonal to each other.

The invention discloses a method used in a base station of multi-antenna transmission, which comprises the following steps:

-step a. transmitting a first wireless signal;

-step b. receiving a second radio signal;

As an embodiment, the antenna port group includes 1 antenna port.

step A0. sending a first higher layer signaling indicating P1.

Wherein P is 1, or P is P1. The P1 is a positive integer greater than 1.

As an embodiment, the first higher layer signaling is cell specific.

As an embodiment, the first higher layer signaling is UE specific.

-step c. transmitting a third radio signal;

-step d. receiving a fourth radio signal;

As an embodiment, the second wireless signal includes P RS port groups, the P RS port groups respectively correspond to the P antenna port groups one to one, the number of RS ports in the RS port group is the same as the number of antenna ports in the corresponding antenna port group, the RS ports in the RS port group correspond to the antenna ports in the corresponding antenna port group one to one, and the RS ports are transmitted by the corresponding antenna ports. In one embodiment, the RS sequence corresponding to the RS port is a Zadoff-Chu sequence. As an embodiment, an RU (Resource Unit) occupied by the RS port is discontinuous in a frequency domain, and occupies a duration of one OFDM symbol in a time domain and occupies a bandwidth of one subcarrier interval in the frequency domain. As an embodiment, the RU is a RE (Resource Element). As an embodiment, the frequency domain spacing between adjacent RUs occupied by the RS ports is the same. As an embodiment, the RS sequences corresponding to different RS ports are different. As an embodiment, the RS sequences corresponding to different RS ports are mutually orthogonal.

As an embodiment, the reference signals on the P RS port groups are respectively used to determine P channel qualities, and the target antenna port group is used to determine a target channel quality, which is the maximum of the P channel qualities.

As an embodiment, the reference signals on the P RS port groups are respectively used to determine CSI corresponding to the P antenna port groups, and the CSI is used to determine T first vectors.

As an embodiment, the third wireless signal is transmitted on a downlink physical layer control channel. As an embodiment, the downlink physical layer control channel is a PDCCH

As an embodiment, any two of the T second vectors are orthogonal to each other.

The invention discloses user equipment used for multi-antenna transmission, which comprises the following modules:

a first receiving module: for receiving a first wireless signal;

a first sending module: for transmitting a second wireless signal;

Wherein the first receiving module is further configured to receive a first higher layer signaling, the first higher layer signaling indicating P1. Wherein P is 1, or P is P1. The P1 is a positive integer greater than 1.

As an embodiment, the antenna port group includes 1 antenna port.

Specifically, the user equipment is characterized by further comprising:

a second receiving module: for receiving a third wireless signal;

a second sending module: for transmitting a fourth wireless signal;

As an embodiment, the second wireless signal includes P RS port groups, the P RS port groups respectively correspond to the P antenna port groups one to one, the number of RS ports in the RS port group is the same as the number of antenna ports in the corresponding antenna port group, the RS ports in the RS port group correspond to the antenna ports in the corresponding antenna port group one to one, and the RS ports are transmitted by the corresponding antenna ports. The second sending module is further configured to send a corresponding RS sequence on the RS port. As an example, the RS sequence is a Zadoff-Chu sequence. As an embodiment, an RU (Resource Unit) occupied by the RS port is discontinuous in a frequency domain, and occupies a duration of one OFDM symbol in a time domain and occupies a bandwidth of one subcarrier interval in the frequency domain. As an embodiment, the RU is a RE (Resource Element). As an embodiment, the frequency domain spacing between adjacent RUs occupied by the RS ports is the same. As an embodiment, the RS sequences corresponding to different RS ports are different. As an embodiment, the RS sequences corresponding to different RS ports are mutually orthogonal.

The invention discloses a base station device used for multi-antenna transmission, which comprises the following modules:

a third sending module: for transmitting a first wireless signal;

a third receiving module: for receiving a second wireless signal;

Wherein the third sending module is further configured to send a first higher layer signaling, the first higher layer signaling indicating P1. Wherein P is 1, or P is P1. The P1 is a positive integer greater than 1.

As an embodiment, the antenna port group includes 1 antenna port.

Specifically, the base station device is characterized by further including:

a fourth sending module: for transmitting a third wireless signal;

a fourth receiving module: for receiving a fourth wireless signal;

As an embodiment, the second wireless signal includes P RS port groups, the P RS port groups respectively correspond to the P antenna port groups one to one, the number of RS ports in the RS port group is the same as the number of antenna ports in the corresponding antenna port group, the RS ports in the RS port group correspond to the antenna ports in the corresponding antenna port group one to one, and the RS ports are transmitted by the corresponding antenna ports. The third receiving module is further configured to receive a corresponding RS sequence on the RS port. As an example, the RS sequence is a Zadoff-Chu sequence. As an embodiment, an RU (Resource Unit) occupied by the RS port is discontinuous in a frequency domain, and occupies a duration of one OFDM symbol in a time domain and occupies a bandwidth of one subcarrier interval in the frequency domain. As an embodiment, the RU is a RE (Resource Element). As an embodiment, the frequency domain spacing between adjacent RUs occupied by the RS ports is the same. As an embodiment, the RS sequences corresponding to different RS ports are different. As an embodiment, the RS sequences corresponding to different RS ports are mutually orthogonal.

Compared with the traditional scheme, the invention has the following advantages:

according to the indication of the base station, the UE flexibly adopts a beam forming or beam sweeping mode to send uplink signals, and the robustness of uplink transmission is always kept;

simultaneously support different precision beam forming and beam sweeping to meet different service requirements.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:

fig. 1 shows a flow diagram of wireless transmission according to an embodiment of the invention;

fig. 2 shows a schematic diagram of an antenna structure according to an embodiment of the invention;

fig. 3 shows a schematic diagram of a resource mapping of antenna port groups according to an embodiment of the invention;

fig. 4 shows a block diagram of a processing device used in a UE according to an embodiment of the invention;

fig. 5 shows a block diagram of a processing device for use in a base station according to an embodiment of the invention;

Detailed Description

The technical solutions of the present invention will be further described in detail with reference to the accompanying drawings, and it should be noted that the features of the embodiments and examples of the present application may be arbitrarily combined with each other without conflict.

Example 1

Embodiment 1 illustrates a flow chart of wireless transmission, as shown in fig. 1. In fig. 1, base station N1 is the serving cell maintenance base station for UE U2. In fig. 1, the steps in block F1 and block F2, respectively, are optional.

For N1, sending first higher layer signaling in step S101, the first higher layer signaling indicating P1, the P1 being a positive integer greater than 1; transmitting a first wireless signal in step S11; receiving a second wireless signal in step S12; transmitting a third wireless signal in step S102; a fourth wireless signal is received in step S103.

For U2, receiving first higher layer signaling in step S201, the first higher layer signaling indicating P1; receiving a first wireless signal in step S21; transmitting a second wireless signal in step S22; receiving a third wireless signal in step S202; a fourth wireless signal is transmitted in step S203.

In embodiment 1, the first wireless signal is used to determine P, which is a positive integer. The second wireless signal includes P sub-signals, which carry the same information. The sub-signal includes UCI including at least one of { HARQ-ACK/NACK, SR, CQI feedback, RI feedback, PMI feedback, CRI }. Time domain resources or frequency domain resources occupied by any two of the P sub-signals are orthogonal. The P sub-signals are respectively transmitted by P antenna port groups, and the antenna port group includes 1 or a plurality of antenna ports. The receiver of the second wireless signal cannot assume that the P sub-signals are transmitted by the same antenna port group.

As sub-embodiment 1 of embodiment 1, the first wireless signal implicitly indicates the P. The first wireless signal comprises { first signaling, first data }, the first signaling comprises scheduling information of the first data, and the sub-signal indicates whether the first data is correctly decoded. And a signaling identifier corresponding to the first signaling is used for determining the P, and the signaling identifier is a positive integer.

As a sub-embodiment of sub-embodiment 1 of embodiment 1, the first signaling is DCI, the signaling identity of the first signaling is RA-RNTI, the P is equal to the P1, wherein the P1 is a fixed constant or the P1 is configurable.

As a sub-embodiment of sub-embodiment 1 of embodiment 1, the first signaling is DCI, the signaling identifier of the first signaling is C-RNTI, and P is equal to 1.

As sub-embodiment 2 of embodiment 1, the first wireless signal explicitly indicates the P. One information bit in the first wireless signal indicates whether the P is 1 or P1, the P1 is a fixed constant or the P1 is configurable.

As sub-embodiment 3 of embodiment 1, the antenna port is formed by superimposing a plurality of antennas through antenna Virtualization (Virtualization), and mapping coefficients of the plurality of antennas to the antenna port form a beamforming vector. The beamforming vectors corresponding to any two antenna ports in the P antenna port groups cannot be assumed to be the same.

As a sub-embodiment of sub-embodiment 3 of embodiment 1, the P antenna port groups correspond to P analog beamforming matrices, and the beamforming vectors corresponding to the antenna ports are formed by the analog beamforming matrices and a digital beamforming vectorFormed by the product of quantities, i.e. w_q,p＝C_pb_q,pWherein P is more than or equal to 1 and less than or equal to P, w_q,pRepresents the beamforming vector, C, corresponding to the q-th antenna port of the p-th antenna port group_pRepresenting the analog beamforming matrix corresponding to the p-th antenna port group, b_q,pAnd representing the digital beamforming vector corresponding to the q antenna port in the p antenna port group.

As a sub-embodiment of sub-embodiment 3 of embodiment 1, the corresponding analog beamforming matrices within different antenna port groups are different, i.e., for 1 ≦ P1 ≦ P, 1 ≦ P2 ≦ P, P1 ≠ P2, C_p1≠C_p2。

As a sub-embodiment of sub-embodiment 3 of embodiment 1, the antenna ports in the same antenna port group correspond to different digital beamforming vectors, that is, b_1,p≠b_2,p≠…≠b_Qp,p。

As sub-embodiment 4 of embodiment 1, different antenna ports in the same antenna port group transmit the second wireless signal in a TDM manner.

As sub-embodiment 5 of embodiment 1, different antenna ports in the same antenna port group transmit the second wireless signal in an FDM manner.

As sub-embodiment 6 of embodiment 1, different antenna ports in the same antenna port group transmit the second wireless signal in a CDM manner.

As sub-embodiment 6 of embodiment 1, different antenna ports in the same antenna port group transmit the second radio signal in a transmit diversity manner. As a sub-embodiment, the transmit diversity is SFBC. As a sub-embodiment, the transmit diversity is STBC.

As sub-embodiment 7 of embodiment 1, the second wireless signal includes P RS port groups, the P RS port groups correspond to the P antenna port groups one to one, the number of RS ports in the RS port group is the same as the number of antenna ports in the corresponding antenna port group, the RS ports in the RS port group correspond to the antenna ports in the corresponding antenna port group one to one, and the RS ports are transmitted by the corresponding antenna ports.

As a sub-embodiment of sub-embodiment 7 of embodiment 1, the RS sequence corresponding to the RS port is a Zadoff-Chu sequence.

As a sub-embodiment of sub-embodiment 7 of embodiment 1, an RU occupied by the RS port is discontinuous in a frequency domain, occupies a duration of one OFDM symbol in a time domain, and occupies a bandwidth of one subcarrier interval in the frequency domain, and the RU is a Resource Element (RE).

As a sub-embodiment of sub-embodiment 7 of embodiment 1, the frequency domain spacing between adjacent RUs occupied by the RS port is the same.

As a sub-embodiment of sub-embodiment 7 of embodiment 1, the RS sequences corresponding to different RS ports are different.

As a sub-embodiment of sub-embodiment 7 of embodiment 1, the RS sequences corresponding to different RS ports are mutually orthogonal.

As a sub-embodiment of sub-embodiment 7 of embodiment 1, the pattern of the RS port within a time frequency block is a pattern of SRS within a time frequency block, the time frequency block occupies a duration of one OFDM in the time domain, the bandwidth occupied in the frequency domain does not exceed 20MHz (megahertz), and the bandwidth occupied in the frequency domain by the RS port includes the bandwidth of a plurality of the time frequency blocks in the frequency domain.

As sub-embodiment 8 of embodiment 1, the third wireless signal is used to determine a target antenna port group, the target antenna port group being one of the P antenna port groups. The target antenna port group comprises Q antenna ports, and the Q antenna ports respectively correspond to Q beamforming vectors { w₁,w₂,…,w_Q}. The fourth wireless signal is transmitted by T antenna ports, where T is a positive integer less than or equal to Q. The Q beamforming vectors { w₁,w₂,…,w_QThe T beamforming vectors in are used for antenna virtualization of the T antenna ports. As a sub-embodimentSaid T is equal to said Q.

As a sub-embodiment of sub-embodiment 8 of embodiment 1, the second radio signal includes P RS port groups, and the P RS port groups correspond to the P antenna port groups one to one. The reference signals on the P RS port groups are respectively used for determining P channel qualities, the target antenna port group is used for determining a target channel quality, and the target channel quality is the maximum value of the P channel qualities

As sub-embodiment 9 of embodiment 1, the third wireless signal is used to determine T first vectors. The fourth wireless signal is transmitted by T antenna ports, wherein the T first vectors are used for antenna virtualization of the T antenna ports, respectively. The T is a positive integer.

As a sub-embodiment of sub-embodiment 9 of embodiment 1, the second radio signal includes P RS port groups, the P RS port groups correspond to the P antenna port groups one to one, the RS ports in the RS port group correspond to the antenna ports in the corresponding antenna port group one to one, and the RS ports are transmitted by the corresponding antenna ports. And corresponding beamforming vectors on any two RS ports are orthogonal to each other. Reference signals on the P RS port groups are respectively used for determining CSI corresponding to the P antenna port groups, and the CSI is used for determining T first vectors.

As sub-embodiment 10 of embodiment 1, the third wireless signal indicates a target antenna port group and a precoding matrix, the precoding matrix is a Q × T-dimensional matrix and is represented as a₁,w₂,…,w_Q}. Q is a positive integer greater than 1. The Q beamforming vectors { w₁,w₂,…,w_QMultiplying the Q elements in the second vector respectively, and then adding to form the corresponding first vector. For T ≦ 1, the tth of the first vector, denoted v _t Calculated from the following formula:

Wherein a is_q,tIs the q-th element of the t-th column of the precoding matrix a.

Example 2

Embodiment 2 illustrates a schematic diagram of an antenna structure, as shown in fig. 2. In fig. 2, a communication node is equipped with G antenna groups, and the G antenna groups respectively correspond to G Radio Frequency (RF) chains. One antenna group comprises V antennas, G is a positive integer, and V is a positive integer. For G ≦ 1 ≦ G, the antennas in antenna group # G include { Ant G _1, Ant G _2, …, Ant G _ V } in FIG. 2, and the antennas in antenna group # G pass through analog beamforming vector c_gPerforming analog beamforming, wherein c_gIs a vector of dimension V × 1, x in FIG. 2₁,…x_QIs a useful signal to be transmitted, which is transmitted after digital beamforming and analog beamforming. The baseband processor is used for the x₁,...x_QThe digital beamforming matrix is denoted by B, where B is a G × Q-dimensional matrix, the Q (1. Q.) th beamforming vector for antenna group # G is the Q-th column B of the digital beamforming matrix B_qAnd the g-th element of (a) and the analog beamforming vector c corresponding to antenna group # g_gProduct of, i.e. b_q,gc_gWherein b is_q,gIs the g-th element of the q-th column of the digital beamforming matrix B.

As sub-embodiment 1 of embodiment 2, the G antenna groups are divided into P groups that do not overlap with each other, and the P groups are mapped to P antenna port groups, respectively. The number of antenna groups included in the p-th antenna port group is G_pAnd (4) showing. The number of antenna groups included in the p-th antenna port group is used

And (4) showing. The Q (1 is more than or equal to Q is less than or equal to Q) th digital beam forming vector corresponding to the P (1 is more than or equal to P is less than or equal to P) th antenna port group is formed by the b_qOf (2) element(s)

Composition of, is represented by

Wherein b is_q,pIs the q-th digital beamforming vector corresponding to the p-th antenna port group, and the symbol "T" represents transposition. Q in the p-th antenna port group_pThe digital beamforming vector corresponding to each antenna port is the Q digital beamforming vector { b }_1,p,b_2,p…b_Q,pQ in (1)_pWherein Q is_pIs a positive integer less than or equal to Q.

As a sub-embodiment of sub-embodiment 1 of embodiment 2, different antenna groups included in the same antenna port group use the same analog beamforming vector, that is, the same analog beamforming vector is used

The antenna groups contained by different antenna port groups use different analog beamforming vectors, namely, for P1 ≦ 1 ≦ P, P2 ≦ P, P1 ≠ P2, and c_p1≠c_p2. The Q (Q is more than or equal to 1 and less than or equal to Q) in the p antenna port group_p) Complete beamforming vector w on individual antenna ports_q,pThe analog beam forming matrix C corresponding to the p-th antenna port group_pAnd the q-th digital beamforming vector b_q,pThe product of (a) is formed, i.e. w_q,p＝C_pb_q,pWherein the analog beamforming matrix C_pIs a G_pV×G_pMatrix of dimensions, said C_pIs composed of G_pC is_pConstructed in diagonal arrangement, i.e.

As a sub-embodiment of sub-embodiment 1 of embodiment 2, different analog beamforming vectors are used by antenna groups in different antenna port groups.

As a sub-embodiment of sub-embodiment 1 of embodiment 2, the analog beamforming vectors used by the antenna groups in different antenna port groups are orthogonal to each other.

As a sub-embodiment of sub-embodiment 1 of embodiment 2, different antenna ports in one of the antenna port groups correspond to different digital beamforming vectors.

As a sub-embodiment of sub-embodiment 1 of embodiment 2, the digital beamforming vectors corresponding to different antenna ports in one of the antenna port groups are orthogonal to each other.

As a sub-embodiment of sub-embodiment 1 of embodiment 2, the number of antenna groups included in all the antenna port groups is the same.

As a sub-embodiment of sub-embodiment 1 of embodiment 2, at least two of the antenna port groups include different numbers of antenna ports.

Example 3

Embodiment 3 illustrates a schematic diagram of resource mapping of the RS port group, as shown in fig. 3. In fig. 3, one of the RS port groups occupies I consecutive OFDM symbols in the time domain and occupies a part of the system bandwidth in the frequency domain. Different antenna port groups occupy different I OFDM symbols in the time domain. The P RS port groups correspond to the P antenna port groups one by one, the number of RS ports in the RS port groups is the same as that of antenna ports in the corresponding antenna port groups, the RS ports in the RS port groups correspond to the antenna ports in the corresponding antenna port groups one by one, and the RS ports are transmitted by the corresponding antenna ports.

As sub-embodiment 1 of embodiment 3, different RS ports of one said RS port group occupy different subcarriers in the frequency domain.

As a sub-embodiment of sub-embodiment 1 of embodiment 3, the subcarriers occupied by different RS ports of one RS port group in the frequency domain are discontinuous.

As a sub-embodiment of sub-embodiment 1 of embodiment 3, the frequency domain spacing between adjacent subcarriers occupied in the frequency domain by different RS ports of one of the RS port groups is the same.

As a sub-embodiment of sub-embodiment 1 of embodiment 3, different RS ports of one of said groups of RS ports occur at equal intervals in the frequency domain.

As a sub-embodiment of sub-embodiment 1 of embodiment 3, one of the RS ports is wideband (i.e. the system bandwidth is divided into positive integer number of frequency domain units, and one RS port group appears in all frequency domain units within the system bandwidth, and the bandwidth corresponding to the frequency difference of two adjacent subcarriers of one RS port is equal).

As sub-embodiment 2 of embodiment 3, different RS ports of one RS port group occupy the same subcarrier in the frequency domain, and the different RS ports correspond to different RS sequences.

As a sub-embodiment of sub-embodiment 2 of embodiment 3, the RS sequence is a Zadoff-Chu sequence.

As a sub-embodiment of sub-embodiment 2 of embodiment 3, RS sequences corresponding to the different RS ports of one RS port group are orthogonal to each other.

As sub-example 3 of example 3, the I is equal to 1.

As sub-example 4 of example 3, said I is equal to 2.

Example 4

Embodiment 4 is a block diagram of a processing apparatus used in a UE, as shown in fig. 4. In fig. 4, the UE device 200 mainly includes a first receiving module 201, a first sending module 202, a second receiving module 203, and a second sending module 204. Wherein the second receiving module 203 and the second sending module 204 are optional.

The first receiving module 201 is configured to receive a first wireless signal; the first sending module 202 is configured to send a second wireless signal; the second receiving module 203 is configured to receive a third wireless signal; the second sending module 204 is configured to send a fourth wireless signal.

In embodiment 4, the first wireless signal is used to determine P, which is a positive integer. The second wireless signal includes P sub-signals, which carry the same information. Time domain resources occupied by any two of the P sub-signals are orthogonal. The P sub-signals are respectively transmitted by P antenna port groups, and the antenna port group includes 1 or a plurality of antenna ports. The receiver of the second wireless signal cannot assume that the P sub-signals are transmitted by the same antenna port group.

The first receiving module in embodiment 4 is further configured to receive a first higher layer signaling, where the first higher layer signaling indicates P1. Wherein P is 1, or P is P1. The P1 is a positive integer greater than 1.

The third radio signal is used for determining at least one of { target antenna port group, T first vectors } in embodiment 4. The target antenna port group is one of the P antenna port groups, and the fourth wireless signal is transmitted by T antenna ports, wherein the target antenna port group is used for antenna virtualization of the T antenna ports, or the T first vectors are respectively used for antenna virtualization of the T antenna ports. The T is a positive integer.

Example 5

Embodiment 5 is a block diagram of a processing apparatus used in a base station, as shown in fig. 5. In fig. 5, the base station apparatus 300 mainly includes a third transmitting module 301, a third receiving module 302, a fourth transmitting module 303 and a fourth receiving module 304. Wherein, the fourth sending module 303 and the fourth receiving module 304 are optional.

The third sending module 301 is configured to send a first wireless signal; the third receiving module 302 is configured to receive a second wireless signal; the fourth sending module 303 is configured to send a third wireless signal; the fourth receiving module 304 is configured to receive a fourth wireless signal.

In embodiment 5, the first wireless signal is used to determine P, which is a positive integer. The second wireless signal includes P sub-signals, which carry the same information. Time domain resources occupied by any two of the P sub-signals are orthogonal. The P sub-signals are respectively transmitted by P antenna port groups, and the antenna port group includes 1 or a plurality of antenna ports. The receiver of the second wireless signal cannot assume that the P sub-signals are transmitted by the same antenna port group.

The third sending module in embodiment 5 is further configured to send first higher layer signaling, where the first higher layer signaling indicates P1. Wherein P is 1, or P is P1. The P1 is a positive integer greater than 1.

The third radio signal described in embodiment 5 is used to determine at least one of { target antenna port group, T first vectors }. The target antenna port group is one of the P antenna port groups, and the fourth wireless signal is transmitted by T antenna ports, wherein the target antenna port group is used for antenna virtualization of the T antenna ports, or the T first vectors are respectively used for antenna virtualization of the T antenna ports. The T is a positive integer.

It will be understood by those skilled in the art that all or part of the steps of the above methods may be implemented by instructing relevant hardware through a program, and the program may be stored in a computer readable storage medium, such as a read-only memory, a hard disk or an optical disk. Alternatively, all or part of the steps of the above embodiments may be implemented by using one or more integrated circuits. Accordingly, the module units in the above embodiments may be implemented in a hardware form, or may be implemented in a form of software functional modules, and the present application is not limited to any specific form of combination of software and hardware. The UE in the invention comprises wireless communication equipment such as but not limited to a mobile phone, a tablet computer, a notebook computer, a network card, an NB-IOT terminal, an eMTC terminal and the like. The base station or system device in the present invention includes but is not limited to a macro cell base station, a micro cell base station, a home base station, a relay base station, and other wireless communication devices.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method in a UE used for multi-antenna transmission, comprising the steps of:

-step a. receiving a first wireless signal;

-step b. transmitting a second radio signal;

-step c. receiving a third wireless signal;

-step d. transmitting a fourth radio signal;

wherein the first wireless signal is used to determine P, which is a positive integer; the second wireless signal comprises P sub-signals, and the P sub-signals carry the same information; time domain resources occupied by any two of the P sub-signals are orthogonal; the P sub-signals are respectively sent by P antenna port groups, and the antenna port groups comprise 1 or a plurality of antenna ports; the receiver of the second wireless signal cannot assume that the P sub-signals are transmitted by the same antenna port group; the third wireless signal is used to determine a target antenna port group; the target antenna port group is one of the P antenna port groups, the fourth wireless signal is transmitted by T antenna ports, and the target antenna port group is used for antenna virtualization of the T antenna ports; the T is a positive integer.

2. The method of claim 1, wherein step a further comprises the steps of:

-step A0. receiving first higher layer signaling, said first higher layer signaling indicating P1;

wherein said P is 1, or said P is said P1; the P1 is a positive integer greater than 1.

3. The method of claim 1, wherein the third wireless signal indicates a precoding matrix, wherein the precoding matrix comprises T second vectors, and wherein the second vectors comprise Q elements; the T first vectors are respectively used for antenna virtualization of the T antenna ports, and the T first vectors and the T second vectors are in one-to-one correspondence; the target antenna port group comprises Q antenna ports, and beam forming vectors corresponding to the Q antenna ports are respectively multiplied by the Q elements in the second vector and then added to form the corresponding first vector; q is a positive integer greater than 1.

4. A method in a base station used for multi-antenna transmission, comprising the steps of:

-step a. transmitting a first wireless signal;

-step b. receiving a second radio signal;

-step c. transmitting a third radio signal;

-step d. receiving a fourth radio signal;

5. The method of claim 4, wherein step A further comprises the steps of:

-step A0. sending a first higher layer signaling indicating P1;

6. The method of claim 4, wherein the third wireless signal indicates a precoding matrix, wherein the precoding matrix comprises T second vectors, and wherein the second vectors comprise Q elements; the T first vectors are respectively used for antenna virtualization of the T antenna ports, and the T first vectors and the T second vectors are in one-to-one correspondence; the target antenna port group comprises Q antenna ports, and beam forming vectors corresponding to the Q antenna ports are respectively multiplied by the Q elements in the second vector and then added to form the corresponding first vector; q is a positive integer greater than 1.

7. A user equipment for multi-antenna transmission, comprising the following modules:

a first receiving module: for receiving a first wireless signal;

a first sending module: for transmitting a second wireless signal;

a second receiving module: for receiving a third wireless signal;

a second sending module: for transmitting a fourth wireless signal;

8. The UE of claim 7, wherein the third wireless signal indicates a precoding matrix, wherein the precoding matrix comprises T second vectors, and wherein the second vectors comprise Q elements; the T first vectors are respectively used for antenna virtualization of the T antenna ports, and the T first vectors and the T second vectors are in one-to-one correspondence; the target antenna port group comprises Q antenna ports, and beam forming vectors corresponding to the Q antenna ports are respectively multiplied by the Q elements in the second vector and then added to form the corresponding first vector; q is a positive integer greater than 1.

9. A base station device used for multi-antenna transmission, comprising the following modules:

a third sending module: for transmitting a first wireless signal;

a third receiving module: for receiving a second wireless signal;

a fourth sending module: for transmitting a third wireless signal;

a fourth receiving module: for receiving a fourth wireless signal;

10. The base station device of claim 9, wherein the third wireless signal indicates a precoding matrix, wherein the precoding matrix comprises T second vectors, and wherein the second vectors comprise Q elements; the T first vectors are respectively used for antenna virtualization of the T antenna ports, and the T first vectors and the T second vectors are in one-to-one correspondence; the target antenna port group comprises Q antenna ports, and beam forming vectors corresponding to the Q antenna ports are respectively multiplied by the Q elements in the second vector and then added to form the corresponding first vector; q is a positive integer greater than 1.