Design of coreset configurations

Abstract

In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a UE. The UE receives a CORESET configuration specifying one or more properties of a first CORESET. The UE also determines time and frequency resource elements of the first CORESET based on the one or more properties. The UE performs blind decoding on down-link control channel candidates in a search space carried by the first CORESET to obtain a down-link control channel.

What is claimed is: 
     
         1 . A method of wireless communication of a user equipment (UE), comprising:
 receiving a control resource set (CORESET) configuration specifying one or more properties of a first CORESET;   determining time and frequency of resource elements of the first CORESET based on the one or more properties; and   performing blind decoding on down-link control channel candidates in a search space carried by the first CORESET to obtain a down-link control channel.   
     
     
         2 . The method of  claim 1 , wherein the one or more properties include at least one of:
 (a) resources occupied by the first CORESET in frequency domain;   (b) resources occupied by the first CORESET in time domain;   (c) a time cycle used for monitoring the down-link control channel candidates in the search space in the first CORESET;   (d) a sub-carrier spacing of frequency resources occupied by the first CORESET;   (e) a mapping between resource element groups (REGs) to Control-Channel Elements (CCEs) of the first CORESET;   (f) a search space configuration defining one or more search spaces contained in the first CORESET;   (g) a first REG bundle size of a REG bundle of the first CORESET; and   (h) a demodulation reference signal (DMRS) configuration of DMRSs carried in the first CORESET.   
     
     
         3 . The method of  claim 2 , wherein the one or more properties include the resources occupied by the first CORESET in time domain, wherein the CORESET configuration indicates a starting symbol period of the first CORESET and a duration of the first CORESET. 
     
     
         4 . The method of  claim 2 , wherein the one or more properties include the search space configuration, wherein the search space configuration indicates a type and a number of candidates at each CCE aggregation level of each search space of the one or more search spaces. 
     
     
         5 . The method of  claim 2 , wherein the one or more properties include the DMRS configuration, wherein the DMRS configuration indicates at least one of a symbol period in which a DMRS is located, a DMRS initialization seed, and a DMRS port. 
     
     
         6 . The method of  claim 2 , wherein the CORESET configuration is received through a system information transmission. 
     
     
         7 . The method of  claim 6 , wherein the system information transmission is a Master Information Block. 
     
     
         8 . The method of  claim 2 , wherein the first CORESET is a common CORESET, which includes a common search space and a UE specific search space. 
     
     
         9 . The method of  claim 8 , wherein the one or more properties include the resources occupied by the first CORESET in frequency domain, wherein the CORESET configuration indicates a starting point of the first CORESET in frequency domain or indicates an offset of a center frequency of the first CORESET from a synchronization signal (SS) block. 
     
     
         10 . The method of  claim 9 , further comprising:
 obtaining a bandwidth of the first CORESET; and   determining the resources occupied by the first CORESET in frequency domain based on (i) the bandwidth of the first CORESET and (ii) the starting point or the offset.   
     
     
         11 . The method of  claim 10 , wherein the first CORESET is located in a common down-link bandwidth part. 
     
     
         12 . The method of  claim 10 , wherein the bandwidth is configured at the UE as a number of physical resource blocks. 
     
     
         13 . The method of  claim 8 , wherein the one or more properties include a time cycle used for monitoring the down-link control channel candidates in search space in the first CORESET in accordance with a periodicity of a control message carried by the first CORESET. 
     
     
         14 . The method of  claim 13 , wherein the control message carried by the first CORESET is a paging message, a random access channel (RACH) response message, or a system information message. 
     
     
         15 . The method of  claim 8 , further comprising:
 determining a subcarrier spacing of the first CORESET based on a subcarrier spacing of a Synchronization Signal (SS) Block.   
     
     
         16 . The method of  claim 8 , further comprising:
 obtaining a mapping that maps REGs of the first CORESET to CCEs of the first CORESET, the mapping being an interleaving mapping;   selecting a set of candidate CCEs of the first CORESET in accordance with an aggregation level of the CCEs; and   determining a set of REGs corresponding to the selected set of CCEs based on the mapping, wherein the blind decoding is performed on the set of REGs in the search space.   
     
     
         17 . The method of  claim 16 , wherein the REGs of the first CORSET are grouped into a plurality of REG bundles, wherein the plurality of REG bundles are interleaved, wherein the CCEs are formed based on the interleaved REG bundles. 
     
     
         18 . The method of  claim 2 , wherein the CORESET configuration is received through a control message. 
     
     
         19 . The method of  claim 18  wherein the control message is a UE-specific radio resource control (RRC) message. 
     
     
         20 . The method of  claim 2 , wherein the first CORESET is an additional CORESET, which includes one or more UE specific search spaces. 
     
     
         21 . The method of  claim 20 , wherein the additional CORESET further includes a common search space. 
     
     
         22 . The method of  claim 20 , wherein the one or more properties include the resources occupied by the first CORESET in frequency domain, wherein the CORESET configuration indicates physical resource blocks occupied by the first CORESET. 
     
     
         23 . The method of  claim 22 , wherein the physical resource blocks are continuous. 
     
     
         24 . The method of  claim 22 , wherein the physical resource blocks are non-continuous. 
     
     
         25 . The method of  claim 20 , wherein the UE is configured more than one bandwidth part, wherein the CORESET configuration further indicates a bandwidth part of the more than one bandwidth part in which the first CORESET is located. 
     
     
         26 . The method of  claim 20 , further comprising:
 monitoring the first CORESET at a slot level or at a symbol level based on the time cycle.   
     
     
         27 . The method of  claim 20 , wherein the one or more properties include a subcarrier spacing of the first CORESET. 
     
     
         28 . The method of  claim 20 , wherein the one or more properties include the mapping that maps REGs to CCEs of the first CORESET, the method further comprising:
 selecting a set of candidate CCEs of the first CORESET in accordance with an aggregation level of the CCEs; and   determining a set of REGs corresponding to the selected set of CCEs based on the mapping, wherein the blind decoding is performed on the set of REGs in the search space.   
     
     
         29 . The method of  claim 28 , wherein the REGs of the first CORSET are grouped into a plurality of REG bundles, wherein the plurality of REG bundles are interleaved, wherein the CCEs are formed based on the interleaved REG bundles. 
     
     
         30 . The method of  claim 28 , wherein the mapping is an interleaving mapping. 
     
     
         31 . The method of  claim 28 , wherein the mapping is a non-interleaving mapping. 
     
     
         32 . The method of  claim 20 , wherein the one or more properties include the first REG bundle size, wherein the REG bundle has a first number of REGs in a symbol period, the first number being equal to a second REG bundle size of the first CORESET when the first CORESET occupies one symbol period in time domain. 
     
     
         33 . An apparatus for wireless communication, the apparatus being a user equipment (UE), comprising:
 a memory; and   at least one processor coupled to the memory and configured to:
 receive a control resource set (CORESET) configuration specifying one or more properties of a first CORESET; 
 determine the time and frequency resource elements of first CORESET based on the one or more properties; and 
 perform blind decoding on down-link control channel candidates in a search space carried by the first CORESET to obtain a down-link control channel. 
   
     
     
         34 . A computer-readable medium storing computer executable code for wireless communication of a user equipment (UE), comprising code to:
 receive a control resource set (CORESET) configuration specifying one or more properties of a first CORESET;   determine the time and frequency resource elements of first CORESET based on the one or more properties; and   perform blind decoding on down-link control channel candidates in a search space carried by the first CORESET to obtain a down-link control channel.