W-CDMA base station with apparatus for providing packet data communications with mobile units or terminals

• US 7,796,564 B2
• Filed: 03/08/2006
• Issued: 09/14/2010
• Est. Priority Date: 03/31/2005
• Status: Expired due to Fees

• Current Assignee: Hitachi Kokusai Electric Incorporated (Hitachi, Ltd.)
• Original Assignee: Hitachi Kokusai Electric Incorporated (Hitachi, Ltd.)
• Inventors: Ishii, Takahito
• Primary Examiner(s): Patel; Jayanti K
• Assistant Examiner(s): CRUTCHFIELD, CHRISTOPHER M
• Application Number:
  US11/369,942
• Publication Number:
  US 20060221906A1
• Time in Patent Office: 1,651 Days
• Field of Search: 370/320
• US Class Current: 370/335
• CPC Class Codes: H04B 1/7115 Constructive combining of multi-path signals, i.e. RAKE receivers
• CPC Class Codes: H04B 1/7117 Selection, re-selection, allocation or re-allocation of paths to fingers, e.g. timing offset control of allocated fingers
• CPC Class Codes: H04B 2201/70702 Intercell-related aspects

Abstract

A base station apparatus is disclosed, which can efficiently process a reception signal from a user with a simpler constitution. The base station includes: a packet data user control unit that controls packet data for a user and transmits the packet data and notifies a user ID of a user who transmits data in an arbitrary frame (packet transmission period) and a number of this frame; and a layer control unit that manages the frame number and the user ID and controls de-spread and demodulation. The layer control unit creates finger/user allocation information indicating to which user a finger is allocated and outputs the finger/user allocation information to a demodulation unit. The demodulation unit performs demodulation processing using this information such that generated phase compensation data is connected with an identical user and an identical path.

Claims

1. A base station apparatus that transmits data to and receives data from a first number of communication terminals, transmits data to a second number of communication terminals after a packet transmission period elapses, the second number being smaller than the first number, and detects response data which indicates whether the respective second number of communication terminals receive data from signals transmitted from the respective second number of communication terminals, the base station apparatus comprising:

a packet data user control processor that outputs a user identifier for uniquely identifying a user, to whom data is determined to be transmitted in the packet transmission period and a frame number for uniquely identifying the packet transmission period to a layer 1 control processor;

the layer 1 control processor that, based on a relation between the frame number and the user associated in advance, allocates each of paths of all users who can receive packet control data to control transmission of packets to a first number of fingers and each of paths of users who receive the packet control data in the frame to a second number of fingers such that a correlator and a complex multiplier are connected with an identical user and an identical path;

the first number of fingers detecting phase fluctuations for the response data from the respective first number of communication terminals;

a phase fluctuation supplying processor that supplies the respective phase fluctuations detected by the first number of fingers to the respective second number of fingers; and

the second number of fingers that, based on the phase fluctuations supplied by the phase fluctuation supplying processor, compensate for phase fluctuations in the response data from the second number of communication terminals corresponding to the phase fluctuations;

wherein the first number indicates the number of users covered by one base station as the maximum, and the second number indicates the number of users that can communicate with the base station in the packet transmission period as the maximum.

2. A base station apparatus according to claim 1,

wherein the first number of fingers includes:

a first number of correlators that detect correlation between code data which indicates the number of codes per user and uniquely identifies the user and the signals transmitted from the respective second number of communication terminals; and

a first number of complex multipliers that subject the correlation detected by the first number of correlators and a pilot symbol for synchronous detection, and

the second number of the fingers includes;

a second number of correlators that detect correlation between the code data and the signals transmitted from the respective second number of communication terminals; and

a second number of complex multipliers that subject the correlation detected by the second number of correlators and the phase fluctuations supplied by a phase fluctuation detecting processor.

3. A base station apparatus according to claim 1,

wherein the phase fluctuation supplying processor holds the respective phase fluctuations detected by the first number of fingers and supplies the phase fluctuations held to the second number of fingers according to the predetermined period and the second number of communication terminals to which the data is transmitted during the predetermined period.

4. The base station apparatus according to claim 1, further comprising:

a packet data user control unit which outputs the frame number and the user identifier to the layer 1 control processor.

5. The base station apparatus according to claim 4, wherein the layer 1 control processor specifies, on the basis of the frame number and the user identifier inputted from the packet data user control processor, the packet transmission period after the packet transmission period identified by the frame number elapses.

6. The base station apparatus according to claim 5, wherein

the layer 1 control processor associates the specified packet transmission period with the user identifier and stores the associated period and the user identifier.

7. The base station apparatus according to claim 4, wherein the layer 1 control processor specifies the terminal to which the response data can be transmitted after the specified packet transmission period elapses.

8. The base station apparatus according to claim 4, wherein the layer 1 control processor creates a finger/user allocation information indicating to which user each of the second number of fingers is allocated.

9. The base station apparatus according to claim 8, wherein the layer 1 control processor outputs the finger/user allocation information to the phase fluctuation supplying processor.

10. The base station apparatus according to claim 9, wherein

the phase fluctuation supplying processor further correlates the finger/user allocation information with each of outputs from the first number of fingers and supplies each of the outputs from the first number of fingers to each of the second number of fingers;

the data detecting correlating processor correlates each of outputs from the second number of fingers, after the specified packet transmission period elapses, and defines a data detecting correlation output; and

the base station compensates for phase fluctuations in response data from the respective second number of communication terminals at least based on the data detection correlation output.