Base station apparatus of mobile communication system

• US 20040076125A1
• Filed: 09/29/2003
• Published: 04/22/2004
• Est. Priority Date: 04/17/1997
• Status: Active Grant

• Current Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Tamura, Motoshi, Nakamura, Takehiro, Onoe, Seizo, Kawakami, Hiroshi, Hagiwara, Junichiro, Morikawa, Hiroki, Nakano, Masatomo, Ohno, Koji, Nakano, Etsuhiro, Higashi, Akihiro
• Granted Patent: US 7,826,861 B2
• Time in Patent Office: Days
• US Class Current: 370/318
• CPC Class Codes: H04B 2201/70701 featuring pilot assisted reception
• CPC Class Codes: H04B 2201/70703 using multiple or variable rates
• CPC Class Codes: H04B 7/2618 using hybrid code-time division multiple access [CDMA-TDMA]
• CPC Class Codes: H04B 7/2628 using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA] H04B7/2618 takes precedence
• CPC Class Codes: H04J 13/00 Code division multiplex systems for frequency hopping H04B1/713
• CPC Class Codes: H04J 13/0022 PN, e.g. Kronecker
• CPC Class Codes: H04J 13/0029 Gold
• CPC Class Codes: H04J 13/0077 Multicode, e.g. multiple codes assigned to one user
• CPC Class Codes: H04J 13/10 Code generation
• CPC Class Codes: H04J 13/16 Code allocation
• CPC Class Codes: H04W 52/08 Closed loop power control
• CPC Class Codes: H04W 52/12 Outer and inner loops
• CPC Class Codes: H04W 52/16 Deriving transmission power values from another channel
• CPC Class Codes: H04W 52/24 using SIR [Signal to Interference Ratio] or other wireless path parameters
• CPC Class Codes: H04W 52/241 taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
• CPC Class Codes: H04W 52/248 where transmission power control commands are generated based on a path parameter
• CPC Class Codes: H04W 52/322 Power control of broadcast channels
• CPC Class Codes: H04W 52/325 Power control of control or pilot channels
• CPC Class Codes: H04W 52/40 during macro-diversity or soft handoff
• CPC Class Codes: H04W 52/50 at the moment of starting communication in a multiple access environment
• CPC Class Codes: H04W 52/56 : Detection of errors of TPC bits
• CPC Class Codes: H04W 52/60 : using different transmission rates for TPC commands
• CPC Class Codes: H04W 88/08 : Access point devices
• CPC Class Codes: H04W 92/10 : between terminal device and access point, i.e. wireless air interface
• CPC Class Codes: H04W 92/12 : between access points and access point controllers

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

1. A communication system comprising a first communication apparatus and a second communication apparatus, wherein

the first communication apparatus comprises:

first reception means for receiving first transmission power control information from the second communication apparatus;

first control means for carrying out transmission power control in accordance with a first control pattern before the first communication apparatus becomes able to receive the first transmission power control information;

second control means for carrying out transmission power control in accordance with the first transmission power control information after the first communication apparatus becomes able to receive the first transmission power control information; and

first transmission means for transmitting second transmission power control information to the second communication apparatus, and the second communication apparatus comprises;

second reception means for receiving the second transmission power control information from the first communication apparatus;

third control means for carrying out transmission power control in accordance with the second transmission power control information after the second communication apparatus becomes able to receive the second transmission power control information; and

second transmission means for transmitting the first transmission power control information to the first communication apparatus.

2. The communication system as claimed in claim 1, wherein the first control pattern is a pattern for increasing transmission power to a predetermined value, and subsequently, less rapidly increasing the transmission power.

3. The communication system as claimed in claim 1, wherein the first communication apparatus further comprises means for varying the first control pattern.

4. The communication system as claimed in claim 1, wherein

the second communication apparatus further comprises third reception means for receiving information regarding an initial value of transmission power from the first communication apparatus, and

the third control means sets an initial value of transmission power in accordance with the information regarding the initial value of the transmission power and carries out the transmission power control.

5. The communication system as claimed in claim 1, wherein the first transmission means transmits a fixed second control pattern as the second transmission power control information before the first communication apparatus becomes able to receive the first transmission power control information.

6. The communication system as claimed in claim 1, wherein

the first transmission means transmits a second control pattern as the second transmission power control information before the first communication apparatus becomes able to receive the first transmission power control information, and

the first communication apparatus further comprises means for varying the second control pattern.

7. The communication system as claimed in claim 1, wherein the second communication apparatus further comprises fourth control means for carrying out transmission power control in accordance with a fixed third control pattern before the first communication apparatus becomes able to receive the first transmission power control information.

8. A communication apparatus comprising:

reception means for receiving transmission power control information;

first control means for carrying out transmission power control in accordance with a control pattern before the communication apparatus becomes able to receive the transmission power control information; and

second control means for carrying out transmission power control in accordance with the transmission power control information after the communication apparatus becomes able to receive the transmission power control information.

9. A communication apparatus comprising:

reception means for receiving transmission power control information; and

control means for carrying out transmission power control in accordance with the transmission power control information after the communication apparatus becomes able to receive the transmission power control information.