Patent ID: 8923232

Claim:
A method of determining, in a network node, communication resources on a downlink channel from the network node to a user equipment in a wireless communication network, the method comprising: determining a channel sequence based on an offset value, a first physical resource block index of a transmission on a physical uplink shared channel (PUSCH) by the user equipment, and on a cyclic shift of uplink demodulation reference signals (DMRS) transmitted by the user equipment; determining a channel group without the offset value and based on the first physical resource block index and the cyclic shift; and determining the communication resources on the downlink channel based on the channel group and the channel sequence; wherein determining the channel group and the channel sequence comprises determining the channel group and the channel sequence according to: n PHICH group =( I PRB — RA lowest — index +n DMRS )mod N PHICH group +I PHICH N PHICH group n PHICH seq =(└ I PRB — RA lowest — index /N PHICH group ┘+n DMRS )+ os PHICH seq,n )mod 2 N SF PHICH in which n PHICH group represents the channel group, n PHICH seq represents the channel sequence, I PRB — RA lowest — index represents the first physical resource block index, n DMRS represents the cyclic shift, N PHICH group represents a number of available channel groups, I PHICH is either zero or unity, N SF PHICH represents a spreading factor of the downlink channel, and os PHICH seq,n represents the offset value.