Method and apparatus for implementing reference signal transmissions in a wireless communication system

Abstract

A method and apparatus for implementing reference signal transmissions in a wireless communication system. In one embodiment, the method includes the cell, transmission point (TP), or transmission and reception point (TRP) broadcasting a first RS periodically for measurement, wherein the first RS is transmitted at multiple occasions (or timings) in each period on different beams. The method also includes the cell, TP, or TRP transmitting a second RS to a UE for PDCCH demodulation, wherein the second RS is transmitted on multiple beams in a beam set of the UE in a subframe (or symbol) in which the PDCCH is transmitted.

1 . A method for reference signal (RS) transmissions in a cell, transmission point (TP), or transmission and reception point (TRP), wherein there are multiple beams used for transmission and/or reception in the cell, TP, or TRP, comprising:
 the cell, TP, or TRP broadcasts a first RS periodically for measurement, wherein the first RS is transmitted at multiple occasions (or timings) in each period on different beams; and   the cell, TP, or TRP transmits a second RS to a UE (User Equipment) for PDCCH (Physical Downlink Control Channel) demodulation, wherein the second RS is transmitted on multiple beams in a beam set of the UE in a subframe (or symbol) in which the PDCCH is transmitted.   
     
     
         2 . The method of  claim 1 , wherein a total number of beams in the cell, TP, or TRP are fixed. 
     
     
         3 . The method of  claim 1 , wherein a direction and a beam width of each beam in the cell, TP, or TRP are fixed. 
     
     
         4 . The method of  claim 1 , further comprising:
 the cell, TP, or TRP communicates with the UE via downlink transmissions and/or uplink receptions, wherein the downlink transmissions and uplink receptions are organized into radio frames, a radio frame contains multiple subframes, and a subframe contains multiple symbols.   
     
     
         5 . The method of  claim 4 , wherein each subframe in the radio frame contains a downlink control portion, an uplink control portion, and/or a data portion. 
     
     
         6 . The method of  claim 5 , wherein the first RS and the second RS are transmitted in the downlink control portion. 
     
     
         7 . The method of  claim 4 , wherein the downlink transmissions and/or uplink receptions relevant to the UE are performed by the cell, TP, or TRP on multiple beams in a beam set of the UE. 
     
     
         8 . A method for reference signal (RS) receptions in a user equipment (UE), wherein there are multiple beams used for transmission and/or reception in a cell, transmission point (TP), or transmission and reception point (TRP), comprising:
 the UE performs measurement on a first RS, wherein the first RS is transmitted periodically by the cell, TP, or TRP at multiple occasions (or timings) in each period on different beams; and   the UE receives a second RS for PDCCH (Physical Downlink Control Channel) demodulation, wherein the second RS is transmitted by the cell, TP, or TRP on multiple beams in a beam set of the UE in a same subframe (or symbol) in which the PDCCH is transmitted.   
     
     
         9 . The method of  claim 8 , wherein a total number of beams in the cell, TP, or TRP are fixed. 
     
     
         10 . The method of  claim 8 , wherein a direction and a beam width of each beam in the cell, TP, or TRP are fixed. 
     
     
         11 . The method of  claim 8 , further comprising:
 the UE communicates with the cell, TP, or TRP via uplink transmissions and downlink receptions, wherein the uplink transmissions and downlink receptions are organized into radio frames, a radio frame contains multiple subframes, and a subframe contains multiple symbols.   
     
     
         12 . The method of  claim 11 , wherein each subframe in the radio frame contains a downlink control portion, an uplink control portion, and/or a data portion. 
     
     
         13 . The method of  claim 12 , wherein the first RS and the second RS are transmitted in the downlink control portion. 
     
     
         14 . A User Equipment (UE) for reference signal (RS) receptions, wherein there are multiple beams used for transmission and/or reception in a cell, transmission point (TP), or transmission and reception point (TRP), comprising:
 a control circuit;   a processor installed in the control circuit; and   a memory installed in the control circuit and operatively coupled to the processor;   wherein the processor is configured to execute a program code stored in the memory to:
 perform measurement on a first RS, wherein the first RS is transmitted periodically by the cell, TP, or TRP at multiple occasions (or timings) in each period on different beams; and 
 receive a second RS for PDCCH (Physical Downlink Control Channel) demodulation, wherein the second RS is transmitted by the cell, TP, or TRP on multiple beams in a beam set of the UE in a same subframe (or symbol) in which the PDCCH is transmitted. 
   
     
     
         15 . The UE of  claim 14 , wherein a total number of beams in the cell, TP, or TRP are fixed. 
     
     
         16 . The UE of  claim 14 , wherein a direction and a beam width of each beam in the cell, TP, or TRP are fixed. 
     
     
         17 . The UE of  claim 14 , wherein the processor is further configured to execute a program code stored in the memory to:
 communicate with the cell, TP, or TRP via uplink transmissions and downlink receptions, wherein the uplink transmissions and downlink receptions are organized into radio frames, a radio frame contains multiple subframes, and a subframe contains multiple symbols.   
     
     
         18 . The UE of  claim 17 , wherein each subframe in the radio frame contains a downlink control portion, an uplink control portion, and/or a data portion. 
     
     
         19 . The UE of  claim 18 , wherein the first RS and the second RS are transmitted in the downlink control portion.