Patent ID: 8400951

Claim:
A method in a wireless communication terminal operating in a time division duplexing (TDD) mode, the method comprising: determining a number of Physical Hybrid ARQ Indicator Channel (PHICH) groups (N) in a downlink subframe using the following equation: N = { k * ceil ⁡ [ N h ⁡ ( N RB DL / 8 ) ] for ⁢ ⁢ normal ⁢ ⁢ C ⁢ ⁢ P k * 2 * ceil ⁡ [ N h ⁡ ( N RB DL / 8 ) ] for ⁢ ⁢ extended ⁢ ⁢ C ⁢ ⁢ P wherein N RB DL is a first parameter indicating a downlink system bandwidth in terms of a number of resource blocks, N h is a second parameter indicating a scaling factor, k is a scaling factor based on a position of the downlink subframe in a radio frame comprising a plurality of subframes, and CP is a cyclic prefix; and receiving downlink control signaling in a set of resource elements in the downlink subframe, wherein the set of resource elements is determined based partly on the number of PHICH groups (N).