Patent ID: 8594039

Claim:
A resource allocating method in a radio communications system performing allocation of a reference resource, comprising: a) allocating a first resource to a first reference signal which is used at least for either of demodulation and detection, wherein the first resource is at least part of the reference resource; b) allocating a second resource to a second reference signal which is used for processing other than demodulation and detection, wherein the second resource is at least part of the reference resource and is separate from the first resource allocated to the first reference signal; and c) allocating a third resource to a channel-quality estimation reference signal, wherein the third resource currently is occupied for the first reference signal and satisfies both i) a condition A that a transmission bandwidth of the channel-quality estimation reference signal is the same as a bandwidth of the first reference signal, and ii) a Condition B that a number of reference signals to be multiplexed by code division multiplexing (CDM) is smaller than a maximum number of multiplexing, wherein the third resource is at least part of the reference resource, wherein the first resource and the second resource are different parts of the reference resource with different transmission bandwidths matching the first and second reference signals, respectively, and wherein the first resource and another resource of the reference resource are arranged to be within a single reference resource, the another resource being allocated to a transmission signal to be demodulated or detected using the first reference signal, wherein, said allocating steps are applied to blocks within a subframe, said first resource is a first short block within the subframe and is comprised of a first bandwidth and a second bandwidth, said second resource is a second short block within the subframe and is comprised of a third bandwidth equal to a sum of the first and second bandwidths, a first long block comprises a fourth bandwidth and a fifth bandwidth, the fourth bandwidth and the fifth bandwidth each different from each of the first, second, and third bandwidths, the first reference signal includes a demodulation/detection reference signal for a first user equipment allocated to the first bandwidth in the first short block, the first reference signal includes a demodulation/detection reference signal for a second user equipment allocated to the second bandwidth in the first short block, the first reference signal includes a demodulation/detection reference signal for third and fourth user equipments allocated to the first bandwidth in the first short block, the first reference signal includes a demodulation/detection reference signal for fifth and sixth user equipments allocated to the second bandwidth in the first short block, and the second reference signal includes a reference signal for channel quality estimation for a seventh user equipment allocated to the third bandwidth in the second small block.