Method for physical control format indicator channel mapping
AssigneeLG Electronics Inc.
InventorsJung Hoon Lee, Joon Kui Ahn
Life of this patent
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Abstract
A method of mapping symbols of a physical control format indicator channel (PCFICH) is described. A start position of a resource element to map the symbols for the PCFICH is determined by flooring a value, obtained by multiplying the number of resource blocks by a variable proportional to a symbol index for the PCFICH and then dividing the multiplied result by 2, wherein the resource blocks are transmitted in downlink. The symbols are mapped in the start position. Therefore, a problem of wasting resource elements or not being able to implement mapping can be solved by applying a simple mapping rule while mapping symbols of the PCFICH.
Claims8
A method of transmitting physical control format indicator channel (PCFICH) symbols in a downlink subframe to a user equipment (UE), the method comprising:
- mapping 16 PCFICH symbols to four resource element groups (REGs) in a first OFDM symbol of the downlink subframe;
- and
- transmitting the mapped 16 PCFICH symbols,
- wherein the four resource element groups comprises a first resource element group including first four resource elements, a second resource element group including second four resource elements, a third resource element group including third four resource elements and a fourth resource element group including fourth four resource elements,
- wherein first resource elements from the first four resource elements, the second four resource elements, the third four resource elements and the fourth four resource elements have positions given by:
- K0,
- K0+└NRBDL/2┘*NSCRB/2,
- K0+└2NRBDL/2┘*NSCRB/2, and
- K0+└3NRBDL/2┘*NSCRB/2, respectively,
- wherein K0 is determined as (NSCRB/2)*(NIDcell mod 2NRBDL),
- wherein ‘NRBDL’ indicates a number of resource blocks transmitted in a downlink,
- wherein ‘NSCRB’ indicates a number of resource elements per a resource block in the frequency domain, and
- wherein ‘NIDcell’ is a physical layer cell identifier.
A method of receiving physical control format indicator channel (PCFICH) symbols in a downlink subframe by a user equipment (UE), the method comprising:
- receiving 16 PCFICH symbols via a first OFDM symbol of the downlink subframe, wherein the 16 PCFICH symbols are mapped to four resource element groups (REGs), wherein the four resource element groups comprises a first resource element group including first four resource elements, a second resource element group including second four resource elements, a third resource element group including third four resource elements and a fourth resource element group including fourth four resource elements, wherein first resource elements from the first four resource elements, the second four resource elements, the third four resource elements and the fourth four resource elements have positions given by:
- K0,
- K0+└NRBDL/2┘*NSCRB/2,
- K0+└2NRBDL/2┘*NSCRB/2, and
- K0+└3NRBDL/2┘*NSCRB/2, respectively wherein K0 is determined as (NSCRB/2)*(NIDcell mod 2NRBDL),
- wherein ‘NRBDL’ indicates a number of resource blocks transmitted in a downlink,
- wherein ‘NSCRB’ indicates a number of resource elements per a resource block in the frequency domain, and
- wherein ‘NIDcell’ is a physical layer cell identifier;
- and
- acquiring information about a number of OFDM symbols used for a control channel based on the received 16 PCFICH symbols.
Dependencies are inferred from the claim text.