Wireless communication method, user equipment, and base station

Patent metadata

Field	Value
Publication number	US-2020366388-A1
Application number	US-201816639883-A
Country	US
Kind code	A1
Filing date	Aug 16, 2018
Priority date	Aug 18, 2017
Publication date	Nov 19, 2020
Grant date	—

Abstract

A wireless communication method includes transmitting, from a base station (BS) that comprises multiple antenna ports (APs), multiple first Channel State Information Reference Signals (CSI-RSs) on the multiple APs using a first CSI-RS resource, receiving, with a user equipment (UE), the multiple first CSI-RSs, and calculating, with the UE, a Reference Signal Received Power (RSRP) value on the first CSI-RS resource. The RSRP value is an average of RSRP values calculated for each of the multiple first CSI-RSs. The RSRP value is calculated in wattage. The wireless communication method further includes reporting, with the UE, at least one of the calculated RSRP value and a CSI Resource Indicator (CRI) that indicates the first CSI-RS resource to the BS.

First claim

What is claimed is:

1 . A wireless communication method comprising:
transmitting, from a base station (BS) that comprises multiple antenna ports (APs), multiple first Channel State Information Reference Signals (CSI-RSs) on the multiple APs using a first CSI-RS resource; receiving, with a user equipment (UE), the multiple first CSI-RSs; and calculating, with the UE, a Reference Signal Received Power (RSRP) value on the first CSI-RS resource.

2 . The wireless communication method according to claim 1 , wherein the RSRP value is a linear average of RSRP values calculated for each of the multiple first CSI-RSs.

3 . The wireless communication method according to claim 1 , wherein the RSRP value is calculated in wattage.

4 . The wireless communication method according to claim 1 , further comprising:
reporting, with the UE, at least one of the calculated RSRP value and a CSI Resource Indicator (CRI) that indicates the first CSI-RS resource to the BS.

5 . The wireless communication method according to claim 1 ,
wherein the transmitting transmits multiple second CSI-RSs on the multiple APs using a second CSI-RS resource, wherein the receiving receives the multiple second CSI-RSs, and wherein the calculating calculates an RSRP value on the second CSI-RS resource.

6 . The wireless communication method according to claim 5 , further comprising:
reporting, with the UE, at least one of the calculated RSRP values on the first CSI-RS resource and the second CSI-RS resource and CRIs to the BS, wherein the CRIs indicate the first CSI-RS resource and the second CSI-RS resource.

7 . The wireless communication method according to claim 5 , further comprising:
determining, with the UE, a CSI-RS resource from the first CSI-RS resource and the second CSI-RS resource based on the calculated RSRP values on the first CSI-RS resource and the second CSI-RS resource, and reporting, with the UE, a CRI that indicates the determined CSI-RS resource to the BS.

8 . The wireless communication method according to claim 7 , wherein the reporting reports the calculated RSRP value of the determined CSI-RS resource.

9 . A user equipment (UE) comprising:
a receiver that receives, from a base station (BS) that comprises multiple antenna ports (APs), multiple first Channel State Information Reference Signals (CSI-RSs) transmitted on the multiple APs using a first CSI-RS resource; and a processor that calculates a Reference Signal Received Power (RSRP) value on the first CSI-RS resource.

10 . The UE according to claim 9 , wherein the RSRP value is an average of RSRP values calculated for each of the multiple first CSI-RSs.

11 . The UE according to claim 9 , wherein the RSRP value is calculated in wattage.

12 . The UE according to claim 9 , further comprising:
a transmitter that transmits, to the BS, at least one of the calculated RSRP value and a CSI Resource Indicator (CRI) that indicates the first CSI-RS resource.

13 . The UE according to claim 9 ,
wherein the receiver receives, from the BS, multiple second CSI-RSs on the multiple APs using a second CSI-RS resource, and wherein the processor calculates a RSRP value on the second CSI-RS resource.

14 . The UE according to claim 13 , further comprising:
the transmitter transmits, to the BS, at least one of the calculated RSRP values on the first CSI-RS resource and the second CSI-RS resource and CRIs, wherein the CRIs indicate the first CSI-RS resource and the second CSI-RS resource.

15 . The UE according to claim 13 ,
wherein the processor determines a CSI-RS resource from the first CSI-RS resource and the second CSI-RS resource based on the calculated RSRP values on the first CSI-RS resource and the second CSI-RS resource, and wherein the transmitter transmits, to the BS, a CRI that indicates the determined CSI-RS resource.

16 . The UE according to claim 15 , wherein the transmitter transmits the calculated RSRP value of the determined CSI-RS resource.

17 . A base station (BS) comprising:
multiple antenna ports (APs); a transmitter that transmits, to a user equipment (UE), multiple first Channel State Information Reference Signals (CSI-RSs) on the multiple APs using a first CSI-RS resource; and a receiver that receives, from the UE, a Reference Signal Received Power (RSRP) value calculated on the first CSI-RS resource.

18 . The UE according to claim 17 , wherein the RSRP value is an average of RSRP values calculated for each of the multiple first CSI-RSs.

19 . The UE according to claim 17 , wherein the RSRP value is calculated in wattage.

20 . The UE according to claim 17 ,
wherein the transmitter transmits, to the UE, multiple second CSI-RSs on the multiple APs using a second CSI-RS resource, wherein the UE calculates a RSRP value on the second CSI-RS resource; wherein the UE determines a CSI-RS resource from the first CSI-RS resource and the second CSI-RS resource based on the calculated RSRP values on the first CSI-RS resource and the second CSI-RS resource, and wherein the receiver receives, from the UE, a CRI that indicates the determined CSI-RS resource.

Assignees

• Ntt Docomo Inc
• Docomo Innovations Inc

Inventors

• Kakishima Yuichi
• Takeda Kazuki
• Na Chongning
• Nagata Satoshi

Classifications

• H04B17/328 Primary

  Reference signal received power [RSRP]; Reference signal received quality [RSRQ] · CPC title

• H04B7/00

  Radio transmission systems, i.e. using radiation field (H04B10/00, H04B15/00 take precedence) · CPC title

• H04B7/0617

  for beam forming · CPC title

• H04L5/0048

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title

• H04W24/08

  Testing, {supervising or monitoring} using real traffic · CPC title