# US 2004/0071192 A1 · Base station apparatus of mobile communication system

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- Number: US 2004/0071192 A1
- Document ID: US20040071192A1
- Status: Published application
- Kind: A1
- Application number: 10/673,658
- Filed: 2003-09-29
- Published: 2004-04-15
- Earliest claimed: 1997-04-17
- Inventors: Takehiro Nakamura; Junichiro Hagiwara; Etsuhiro Nakano; Koji Ohno; Seizo Onoe; Akihiro Higashi; Motoshi Tamura; Masatomo Nakano; Hiroshi Kawakami; Hiroki Morikawa
- Web page: https://patentgrep.com/patent/US20040071192A1

## CPC

- H04W 88/08: Access point devices
- H04B 7/2628: {using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA] (H04B7/2618 takes precedence)}
- H04J 13/00: Code division multiplex systems (for frequency hopping H04B1/713)
- H04J 13/0022: {PN, e.g. Kronecker}
- H04J 13/0077: {Multicode, e.g. multiple codes assigned to one user}
- H04J 13/10: Code generation
- H04J 13/16: Code allocation
- H04W 52/241: {taking into account channel quality metrics, e.g. SIR, SNR, CIR or Eb/lo}
- H04W 52/248: {where transmission power control commands are generated based on a path parameter}
- H04W 52/322: {Power control of broadcast channels}
- H04W 52/325: {Power control of control or pilot channels}
- H04W 52/50: at the moment of starting communication in a multiple access environment
- H04B 7/2618: {using hybrid code-time division multiple access [CDMA-TDMA]}
- H04B 2201/70701: featuring pilot assisted reception
- H04B 2201/70703: using multiple or variable rates
- H04J 13/0029: {Gold}
- H04W 52/08: Closed loop power control
- H04W 52/12: Outer and inner loops
- H04W 52/16: Deriving transmission power values from another channel
- H04W 52/24: using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W 52/40: during macro-diversity or soft handoff
- H04W 52/56: Detection of errors of TPC bits
- H04W 52/60: using different transmission rates for TPC commands
- H04W 92/10: between terminal device and access point, i.e. wireless air interface
- H04W 92/12: between access points and access point controllers
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04B: TRANSMISSION
- H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S)

## Abstract

A base station including a transmitting and receiving amplifier for amplifying CDMA signals exchanged with a mobile station; a radio stage connected to the transmitting and receiving amplifier for carrying out D/A conversion of a transmitted signal that undergoes baseband spreading, followed by quadrature modulation, and for carrying out quasi-coherent detection of a received signal, followed by A/D conversion; a baseband signal processor connected with the radio stage for carrying out baseband signal processing of the transmitted signal and the received signal; a transmission interface connected with the baseband signal processor for implementing interface with external channels; and a base station controller for carrying out control such as management of radio channels and establishment and release of the radio channels. The base station communicates with the external channels by mapping logical channels into physical channels. The CDMA signals are spread using a short code and a long code.

## Claims

### Claim 1

A communication system comprising a first communication apparatus and a second communication apparatus, wherein
the first communication apparatus comprises:
first spreading code generating means for generating a spreading code;
means for spreading a signal by using the spreading code generated by the first spreading code generating means; and
means for transmitting the spread signal, and
the first spreading code generating means generates the spreading code by using a same short code for an inphase component and a quadrature component and different long codes for the inphase component and the quadrature component, and
the second communication apparatus comprises:
means for receiving the spread signal;
second spreading code generating means for generating the spreading code; and
means for despreading the spread signal by using the spreading code generated by the second spreading code generating means, and
the second spreading code generating means generates the spreading code by using the same short code for the inphase component and the quadrature component and the different long codes for the inphase component and the quadrature component.

### Claim 2 (depends on 1)

The communication system as claimed in claim 1, wherein the long code for the quadrature component is a code obtained by shifting a phase of the long code for the inphase component.

### Claim 3

A communication apparatus comprising:
spreading code generating means for generating a spreading code;
means for spreading a signal by using the spreading code generated by the spreading code generating means: and
means for transmitting the spread signal,
wherein the spreading code generating means generates the spreading code by using a same short code for an inphase component and a quadrature component and different long codes for the inphase component and the quadrature component.

### Claim 4

A communication apparatus comprising:
means for receiving a spread signal;
spreading code generating means for generating a spreading code; and
means for despreading the spread signal by using the spreading code generated by the spreading code generating means,
wherein the spreading code generating means generates the spreading code by using a same short code for an inphase component and a quadrature component and different long codes for the inphase component and the quadrature component.