Enhanced Broadcast Channel for Primary System Information acquisition in OFDM/OFDMA Systems
New enhanced physical broadcast channel (EPBCH) based on UE-specific reference signals (DMRS) for MIB and SIB transmission is proposed. The overall design consideration for EPBCH can be summarized as follows: support different values of frequency reuse factor, support different cell coverage sizes, maximized diversity gain in open-loop operation such as transmit diversity and frequency diversity, minimized overhead, and minimized UE complexity.
1 . A method comprising:
(a) receiving, by a user equipment (UE) in a serving cell, a set of radio resources reserved for enhanced physical broadcast channel (EPBCH) transmission from a base station in a set of specific subframes, wherein the set of radio resources is reserved for primary system information broadcasting in the serving cell based on a first predetermined rule;
(b) determining a set of candidate EPBCHs within the reserved radio resources based on a second predetermined rule, wherein each EPBCH candidate is associated with a set of resource units;
(c) collecting a plurality of resource elements (REs) for each resource unit; and
(d) decoding the primary system information from one or more detected EPBCH transmission in the set of EPBCH candidates, wherein the detection of EPBCH transmission is determined by a successful decoding of the primary system information.
2 . The method of claim 1 , wherein the first predetermined rule is a function based on a physical cell ID (PCI) or a cell type of the serving cell.
3 . The method of claim 1 , wherein the second predetermined rule is a function based on a physical cell ID (PCI) or a cell type of the serving cell.
4 . The method of claim 1 , wherein each resource unit is a physical resource block (PRB) pair.
5 . The method of claim 1 , wherein each resource unit is an enhanced resource element group (EREG), and wherein each resource unit consists of a number of REs within a physical resource block (PRB) pair.
6 . The method of claim 1 , wherein each resource unit is an enhanced control channel element (ECCE), and wherein each resource unit consists of a number of REs within a physical resource block (PRB) pair.
7 . The method of claim 1 , wherein each resource unit is an enhanced control channel element (ECCE), and wherein each ECCE consists of a number of EREGs based on an EREG-to-ECCE mapping rule.
8 . The method of claim 7 , wherein the collecting in (c) involves:
collecting a plurality of EREGs for each ECCE; and
collecting the plurality REs for each EREG, wherein each EREG consists of a number of REs based on an RE-to-ERGE mapping rule.
9 . The method of claim 1 , wherein each EPBCH candidate is defined with different aggregation levels using a resource unit as a basic unit.
10 . The method of claim 1 , wherein each EPBCH candidate spans in frequency domain in one subframe.
11 . The method of claim 1 , wherein each EPBCH candidate spans in both frequency domain and in time domain in different subframes.
12 . The method of claim 1 , wherein the set of EPBCH candidates is a full set of all available EPBCH candidates within the reserved radio resources.
13 . The method of claim 1 , wherein the set of EPBCH candidates is a subset of all available EPBCH candidates within the reserved radio resources.
14 . A method comprising:
(a) reserving a set of radio resources for enhanced physical broadcast channel (EPBCH) transmission in a set of specific subframes by a base station, wherein the set of radio resources is reserved for primary system information broadcasting in a serving cell based on a first predetermined rule;
(b) allocating a set of EPBCH candidates within the reserved radio resources based on a second predetermined rule, wherein each EPBCH candidate is associated with a set of resource units; and
(d) encoding the primary system information over the corresponding set of resource units to be transmitted in the set of specific subframes.
15 . The method of claim 14 , wherein the first predetermined rule is a function based on a physical cell ID (PCI) or a cell type of the serving cell.
16 . The method of claim 14 , wherein the second predetermined rule is a function based on a physical cell ID (PCI) or a cell type of the serving cell.
17 . The method of claim 14 , wherein each resource unit is a physical resource block (PRB) pair.
18 . The method of claim 14 , wherein each resource unit is an enhanced resource element group (EREG), and wherein each resource unit consists of a number of REs within a physical resource block (PRB) pair.
19 . The method of claim 14 , wherein each resource unit is an enhanced control channel element (ECCE), and wherein each resource unit consists of a number of REs within a physical resource block (PRB) pair.
20 . The method of claim 14 , wherein each resource unit is an enhanced control channel element (ECCE), and wherein each ECCE consists of a number of EREGs based on an EREG-to-ECCE mapping rule, and wherein each EREG consists of a number of REs based on an RE-to-ERGE mapping rule.
21 . The method of claim 14 , wherein each EPBCH candidate is defined with different aggregation levels using a resource unit as a basic unit.
22 . The method of claim 14 , wherein each EPBCH candidate spans in frequency domain in one subframe.
23 . The method of claim 14 , wherein each EPBCH candidate spans in both frequency domain and in time domain in different subframes.
24 . The method of claim 14 , wherein the set of EPBCH candidates is a full set of all available EPBCH candidates within the reserved radio resources.
25 . The method of claim 14 , wherein the set of EPBCH candidates is a subset of all available EPBCH candidates within the reserved radio resources.