Base station apparatus, mobile station apparatus, and method of transmitting synchronization channels
AssigneeNtt Docomo, Inc.
InventorsYoshihisa Kishiyama, Satoshi Nagata, Motohiro Tanno, Kenichi Higuchi, Mamoru Sawahashi
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Abstract
A base station apparatus in a radio communications system is disclosed. The base station apparatus communicates with a mobile station using an OFDM scheme in downlink. The base station apparatus includes a sync signal generating unit which generates a secondary sync channel; a multiplying unit which multiplies a scramble code with the secondary sync channel; and a transmitting unit which transmits the secondary sync channel with which the scramble code is multiplied. Cell-specific information is detected by the secondary sync channel.
Claims17
A base station apparatus which communicates with a mobile station using an OFDM scheme in downlink, comprising:
- a first generating unit which generates a primary sync channel;
- a second generating unit which generates a secondary sync channel by scrambling, using two types of mutually different scrambled sequences, on each of two types of short codes to be alternately arranged in frequency domain;
- and
- a transmitting unit which transmits the primary sync channel generated at the first generating unit and the secondary sync channel generated at the second generating unit,
- wherein the first generating unit generates the primary sync channel based on a primary sync channel sequence number, and
- wherein the second generating unit uses a scrambled sequence associated with the primary sync channel sequence number.
A method of transmitting in a base station apparatus which communicates with a mobile station in downlink using an OFDM scheme, comprising the steps of:
- generating a primary sync channel;
- generating a secondary sync channel by scrambling, using two types of mutually different scrambled sequences, on each of two types of short codes to be alternately arranged in frequency domain;
- and
- transmitting the primary sync channel and the secondary sync channel,
- wherein the step of generating the primary sync channel generates the primary sync channel based on a primary sync channel sequence number and
- wherein the step of generating the secondary sync channel uses a scrambled sequence associated with the primary sync channel sequence number.
A radio communications system, comprising:
- a mobile station;
- and
- a base station apparatus which communicates with the mobile station using an OFDM scheme in downlink,
- wherein the base station apparatus, generates a primary sync channel based on a primary sync channel sequence number, generates a secondary sync channel by scrambling, using two types of mutually different scrambled sequences which are associated with the primary sync channel sequence number, on two types of short codes to be alternately arranged in frequency domain, and transmits the primary sync channel and the secondary sync channel.
Dependencies are inferred from the claim text.