REFERENCE SIGNAL MULTIPLEXING AND RESOURCE ALLOCATION

• US 20130121305A1
• Filed: 01/02/2013
• Published: 05/16/2013
• Est. Priority Date: 08/22/2006
• Status: Abandoned Application

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: KAKURA, Yoshikazu, YOSHIDA, Shousei, INOUE, Takamichi
• Application Number:
  US13/732,800
• Publication Number:
  US 20130121305A1
• Time in Patent Office: Days
• US Class Current: 370/330
• CPC Class Codes: H04L 1/20 using signal quality detector
• CPC Class Codes: H04L 27/2602 Signal structure
• CPC Class Codes: H04L 27/26035 Maintenance of orthogonality, e.g. for signals exchanged between cells or users, or by using covering codes or sequences using different training sequence per antenna H04B7/0684; code allocation H04J13/16
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 27/26134 Pilot insertion in the transmitter chain, e.g. pilot overlapping with data, insertion in time or frequency domain
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

A reference signal of a user equipment to which a resource (LB#1) is allocated for a L1/L2 control signal, is allocateda resource (SB#1) that is closer on the time axis to the resource (LB#1), which the L1/L2 control signal is allocated, within the same frequency band as the L1/L2 control signal. A reference signal for CQI estimation, independent of a data signal and a L1/L2 control signal, is allocated a resource with which at least one of a reference signal for demodulation of a data signal and a reference signal for demodulation of a L1/L2 control signal is not transmitted at the same timing within the transmission band. The types of bandwidths of the reference signals multiplexed in a same short block within a same band are reduced, whereby restrictions as to the number of reference signal sequences that can be secured are diminished.

Claims

1. A mobile station, comprising:

a control signal transmission unit which transmits an ACK/NACK control signal for a downlink data signal;

a data signal transmission unit which transmits an uplink data signal;

a reference signal generating unit which generates a demodulation reference signal and a quality estimation reference signal based on a CAZAC sequence;

a reference signal transmission unit which transmits the demodulation reference signal and the quality estimation reference signal generated at the reference signal generating unit; and

a resource allocation unit which allocates a time resource and a frequency resource to the demodulation reference signal, the quality estimation reference signal, the ACK/NACK control signal and the uplink data signal respectively,

wherein the resource allocation unit allocates, to the quality estimation reference signal, the time resource and the frequency resource which are difference from the time resource and the frequency resource allocated to the ACK/NACK control signal and the uplink data signal, and

wherein the reference signal transmission unit transmits the quality estimation reference signal based on at least one preset subcarrier which is among subcarriers in the frequency resource allocated to the quality estimation reference signal.

2. The mobile station according to claim 1, wherein at least one preset subcarrier is arranged for a preset interval.

3. A wireless communication method in a mobile station, comprising:

transmitting an ACK/NACK control signal for a downlink data signal;

transmitting an uplink data signal;

generating a demodulation reference signal and a quality estimation reference signal based on a CAZAC sequence;

transmitting the demodulation reference signal and the quality estimation reference signal;

allocating a time resource and a frequency resource to the demodulation reference signal, the quality estimation reference signal, the ACK/NACK control signal and the uplink data signal respectively;

allocating, to the quality estimation reference signal, the time resource and the frequency resource which are difference from the time resource and the frequency resource allocated to the ACK/NACK control signal and the uplink data signal; and

transmitting the quality estimation reference signal based on at least one preset subcarrier which is among subcarriers in the frequency resource allocated to the quality estimation reference signal.

4. The wireless communication method according to claim 3, wherein at least one preset subcarrier is arranged for a preset interval.