Base station apparatus of mobile communication system

• US 7,826,861 B2
• Filed: 09/29/2003
• Issued: 11/02/2010
• Est. Priority Date: 04/17/1997
• Status: Expired due to Fees

• 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
• Primary Examiner(s): Appiah; Charles N
• Assistant Examiner(s): AJIBADE AKONAI, OLUMIDE
• Application Number:
  US10/674,003
• Publication Number:
  US 20040076125A1
• Time in Patent Office: 2,591 Days
• Field of Search: 455/522, 455/558, 455/69, 455/13.4, 455/63.1, 455/67.13, 455/502, 455/68, 370/335, 370/318, 370/317
• US Class Current: 455/522
• 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:

reception means for receiving transmission power control information which is based on signal-to-interference ratio (SIR) measurement results in the second communication apparatus from the second communication apparatus;

first control means for carrying out transmission power control of the first communication apparatus in accordance with a predetermined control pattern before the first communication apparatus becomes able to receive the transmission power control information from the second communication apparatus, the predetermined control pattern being fixed and invariable; and

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

the second communication apparatus comprises;

transmission means for transmitting the transmission power control information which is based on SIR measurement results in the second communication apparatus to the first communication apparatus.

2. The communication system as claimed in claim 1, wherein the predetermined control pattern is a fixed and invariable pattern for increasing transmission power of the first communication apparatus step by step regularly.

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

4. The communication system as claimed in claim 1, wherein the first communication apparatus is a base station and the second communication apparatus is a mobile station.

5. A communication apparatus comprising:

reception means for receiving transmission power control information which is based on signal-to-interference ratio (SIR) measurement results in another communication apparatus;

first control means for carrying out transmission power control of the communication apparatus in accordance with a predetermined control pattern before the communication apparatus becomes able to receive the transmission power control information from the another communication apparatus, the predetermined control pattern being fixed and invariable; and

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

6. The communication apparatus as claimed in claim 5, wherein the predetermined control pattern is a fixed and invariable pattern for increasing transmission power of the communication apparatus step by step regularly.

7. The communication apparatus as claimed in claim 6, wherein the predetermined control pattern is a fixed and invariable pattern for increasing the transmission power of the communication apparatus to a predetermined value, and subsequently, less rapidly increasing the transmission power of the communication apparatus.

8. The communication apparatus as claimed in claim 5, wherein the communication apparatus is a base station and the another communication apparatus is a mobile station.

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

the first communication apparatus comprises:

first transmission means for transmitting transmission power control information which is based on signal-to-interference ratio (SIR) measurement results in the first communication apparatus to the second communication apparatus; and

second transmission means for transmitting information regarding an initial value of transmission power of the second communication apparatus to the second communication apparatus, and

the second communication apparatus comprises;

first reception means for receiving the transmission power control information which is based on SIR measurement results in the first communication apparatus from the first communication apparatus;

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

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

wherein the control means sets an initial value of transmission power of the second communication apparatus in accordance with the information regarding the initial value of the transmission power and starts the transmission power control with the initial value.

10. The communication system as claimed in claim 9, wherein the first transmission means transmits transmission power control information for regularly raising the transmission power of the second communication apparatus instead of the transmission power control information based on SIR measurement results before the first communication apparatus becomes able to synchronize with a signal from the second communication apparatus.

11. The communication system as claimed in claim 9, wherein the first communication apparatus is a base station and the second communication apparatus is a mobile station.

12. A communication apparatus comprising:

first reception means for receiving transmission power control information which is based on signal-to-interference ratio (SIR) measurement results in another communication apparatus;

control means for carrying out transmission power control of the communication apparatus in accordance with the transmission power control information received from the another communication apparatus after the communication apparatus becomes able to receive the transmission power control information from the another communication apparatus; and

second reception means for receiving information regarding an initial value of transmission power of the communication apparatus,

wherein the control means sets an initial value of transmission power of the communication apparatus in accordance with the information regarding the initial value of the transmission power and starts the transmission power control with the initial value.

13. The communication apparatus as claimed in claim 12, wherein the communication apparatus is a mobile station and the another communication apparatus is a base station.

14. A communication apparatus comprising:

first transmission means for transmitting transmission power control information which is based on signal-to-interference ratio (SIR) measurement results in the communication apparatus to another communication apparatus; and

second transmission means for transmitting information regarding an initial value of transmission power of the another communication apparatus to said another communication apparatus,

wherein the first transmission means transmits transmission power control information for regularly raising the transmission power of the another communication apparatus instead of the transmission power control information based on SIR measurement results before said communication apparatus becomes able to synchronize with a signal from said another communication apparatus.

15. The communication apparatus as claimed in claim 14, further comprising means for varying a pattern of the transmission power control information for regularly raising the transmission power of the another communication apparatus.

16. The communication apparatus as claimed in claim 14, wherein the communication apparatus is a base station and the another communication apparatus is a mobile station.

17. A communication method at a communication system comprising a first communication apparatus and a second communication apparatus, comprising:

a transmission step of transmitting, at the second communication apparatus, transmission power control information which is based on signal-to-interference ratio (SIR) measurement results in the second communication apparatus to the first communication apparatus;

a first control step of carrying out, at the first communication apparatus, transmission power control of the first communication apparatus in accordance with a predetermined control pattern before the first communication apparatus becomes able to receive the transmission power control information from the second communication apparatus, the predetermined control pattern being fixed and invariable;

a reception step of receiving, at the first communication apparatus, the transmission power control information which is based on SIR measurement results in the second communication apparatus from the second communication apparatus; and

a second control step of carrying out, at the first communication apparatus, transmission power control of the first communication apparatus in accordance with the transmission power control information received from the second communication apparatus after the first communication apparatus becomes able to receive the transmission power control information from the second communication apparatus.

18. The communication method as claimed in claim 17, wherein the predetermined control pattern is a fixed and invariable pattern of the first communication apparatus for increasing transmission power step by step regularly.

19. The communication method as claimed in claim 18, wherein the predetermined control pattern is a fixed and invariable pattern for increasing the transmission power of the first communication apparatus to a predetermined value, and subsequently, less rapidly increasing the transmission power of the first communication apparatus.

20. The communication method as claimed in claim 17, wherein the first communication apparatus is a base station and the second communication apparatus is a mobile station.

21. A communication method at a communication apparatus, comprising:

a reception step of receiving transmission power control information which is based on signal-to-interference ratio (SIR) measurement results in another communication apparatus from the another communication apparatus;

a first control step of carrying out transmission power control of the communication apparatus in accordance with a predetermined control pattern before the communication apparatus becomes able to receive the transmission power control information from the another communication apparatus, the predetermined control pattern being fixed and invariable; and

a second control step of carrying out transmission power control of the communication apparatus in accordance with the transmission power control information received from the another communication apparatus after the communication apparatus becomes able to receive the transmission power control information from the another communication apparatus.

22. The communication method as claimed in claim 21, wherein the predetermined control pattern is a fixed and invariable pattern for increasing transmission power of the communication apparatus step by step regularly.

23. The communication method as claimed in claim 22, wherein the predetermined control pattern is a fixed and invariable pattern for increasing the transmission power of the first communication apparatus to a predetermined value, and subsequently, less rapidly increasing the transmission power of the communication apparatus.

24. The communication method as claimed in claim 21, wherein the communication apparatus is a base station and the another communication apparatus is a mobile station.

25. A communication method at a communication system comprising a first communication apparatus and a second communication apparatus, comprising:

a first transmission step of transmitting, at the first communication apparatus, transmission power control information which is based on signal-to-interference ratio (SIR) measurement results in the first communication apparatus to the second communication apparatus;

a second transmission step of transmitting, at the first communication apparatus, information regarding an initial value of transmission power of the second communication apparatus to the second communication apparatus;

a first reception step of receiving, at the second communication apparatus, the transmission power control information which is based on SIR measurement results in the first communication apparatus from the first communication apparatus;

a second reception step of receiving, at the second communication apparatus, the information regarding the initial value of the transmission power from the first communication apparatus; and

a control step of carrying out, at the second communication apparatus, transmission power control of the second communication apparatus in accordance with the transmission power control information received from the first communication apparatus after the second communication apparatus becomes able to receive the transmission power control information from the first communication apparatus,

wherein the control step sets an initial value of transmission power of the second communication apparatus in accordance with the information regarding the initial value of the transmission power and starts the transmission power control with the initial value.

26. The communication method as claimed in claim 25, wherein the first transmission step transmits transmission power control information for regularly raising the transmission power of the second communication apparatus instead of the transmission power control information based on SIR measurement results before the first communication apparatus becomes able to synchronize with a signal from the second communication apparatus.

27. The communication method as claimed in claim 25, wherein the first communication apparatus is a base station and the second communication apparatus is a mobile station.

28. A communication method at a communication apparatus, comprising:

a first reception step of receiving transmission power control information which is based on signal-to-interference ratio (SIR) measurement results in another communication apparatus;

a control step of carrying out transmission power control of the communication apparatus in accordance with the transmission power control information received from the another communication apparatus after the communication apparatus becomes able to receive the transmission power control information from the another communication apparatus; and

a second reception step of receiving information regarding an initial value of transmission power of the communication apparatus,

wherein the control step sets an initial value of transmission power of the communication apparatus in accordance with the information regarding the initial value of the transmission power and starts the transmission power control with the initial value.

29. The communication method as claimed in claim 28, wherein the communication apparatus is a mobile station and the another communication apparatus is a base station.

30. A communication method at a first communication apparatus, comprising:

a first transmission step of transmitting transmission power control information which is based on signal-to-interference ratio (SIR) measurement results in the first communication apparatus to a second communication apparatus; and

a second transmission step of transmitting information regarding an initial value of transmission power of the second communication apparatus to the second communication apparatus,

wherein the first transmission step transmits transmission power control information for regularly raising the transmission power of the second communication apparatus instead of the transmission power control information based on SIR measurement results before the first communication apparatus becomes able to synchronize with a signal from the second communication apparatus.

31. The communication method as claimed in claim 30, further comprising a step of varying a pattern of the transmission power control information for regularly raising the transmission power of the second communication apparatus.

32. The communication method as claimed in claim 30, wherein the first communication apparatus is a base station and the second communication apparatus is a mobile station.