RADIO COMMUNICATION SYSTEM, BASE STATION, RADIO COMMUNICATION APPARATUS, AND RADIO COMMUNICATION METHOD

摘要

A base station classifies at least some of radio communication apparatuses belonging to the same cell into a plurality of groups. The base station assigns to a first group a first signal sequence that is orthogonal to a cyclically shifted version thereof, and assigns to a second group a second signal sequence that is orthogonal to a cyclically shifted version thereof and that is different from the first signal sequence and from the cyclically shifted version of the first signal sequence. The radio communication apparatus belonging to the first group performs spread modulation on data using the first signal sequence or a signal sequence obtained by cyclically shifting the first signal sequence. The radio communication apparatus belonging to the second group performs spread modulation on data using the second signal sequence or a signal sequence obtained by cyclically shifting the second signal sequence.

主权项

1. A radio communication system comprising:
a base station; and a plurality of radio communication apparatuses; wherein the base station is configured to: when the plurality of radio apparatuses belong to a same cell, classify at least some of the plurality of radio communication apparatuses into a plurality of groups including first and second groups, and assign to the first group a first signal sequence that has a property of being orthogonal to a signal sequence obtained by cyclically shifting the first signal sequence, and assign to the second group a second signal sequence that has a property of being orthogonal to a signal sequence obtained by cyclically shifting the second signal sequence, the second signal sequence being different from the first signal sequence and from the signal sequence obtained by cyclically shifting the first signal sequence; and wherein each of the plurality of radio communication apparatuses is configured to: when the radio communication apparatus belongs to the first group, perform spread modulation on data using the first signal sequence or the signal sequence obtained by cyclically shifting the first signal sequence, and transmit the data to the base station, and when the radio communication apparatus belongs to the second group, perform spread modulation on data using the second signal sequence or the signal sequence obtained by cyclically shifting the second signal sequence, and transmit the data to the base station.