Base station receiver equipment

• US 5,684,793 A
• Filed: 03/22/1996
• Issued: 11/04/1997
• Est. Priority Date: 06/07/1993
• Status: Expired due to Term

• Current Assignee: Nokia Telecommunications Oy (Nokia Corporation)
• Original Assignee: Nokia Telecommunications Oy (Nokia Corporation)
• Inventors: Keskitalo, Ilkka, Jolma, Petri, Kiema, Arto, Savusalo, Jari
• Primary Examiner(s): Chin, Wellington
• Assistant Examiner(s): VU, HUY DUY
• Application Number:
  US08/564,197
• Time in Patent Office: 592 Days
• Field of Search: 370/18, 370/19, 370/20, 370/21, 370/53, 370/54, 370/58.1, 370/58.2, 370/65.5, 370/252, 370/320, 370/328, 370/335, 370/342, 370/357, 370/360, 370/384, 370/441, 370/58.3, 375/205, 375/267, 375/200, 375/206, 375/207, 375/208, 375/209, 375/210, 375/347, 375/369, 455/65, 455/52.3, 455/101, 455/132, 455/133, 455/135, 455/137, 455/138, 455/226.1, 455/226.2, 455/226.3, 455/296, 455/273, 455/303, 455/52.1
• US Class Current: 370/335
• CPC Class Codes: H04B 1/709 Correlator structure
• 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 2201/7071 with dynamic control of receiver resources
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A rake-type CDMA base station receiver equipment, including a plurality of correlators each having a received signal as its input, a plurality of diversity combiners for respective receiver branches, and a measurer for measuring the quality of the received signal. To reduce the number of correlators and diversity combiners, the receiver equipment further includes switches for switching the correlators to the different combiners, and controllers for controlling the switches on the basis of data sent from the measurer for measuring the quality of the received signal or on the basis of the capacity loading of the base station receiver equipment.

Claims

1. A rake-type CDMA base station receiver equipment, comprising:

a number of correlators each having a received signal as its input,

a number of diversity combiners for respective receiver branches,

means for measuring the quality of the received signal, means for switching the correlators to the combiner of any one of the receiver branches, and means for controlling the switching means on the basis of data sent from the means for measuring the quality of the received signal or on the basis of the capacity loading of the base station receiver equipment.

2. The base station receiver equipment according to claim 1, wherein:

the means for switching the correlators to the combiners are implemented by a switching matrix.

3. The base station receiver equipment according to claim 1, wherein:

the means controlling the switching of the correlators to the desired combiners are located in a base station controller or in a base station having said receiver equipment.

4. The base station receiver equipment according to claim 1, wherein:

a signal-to-noise ratio measured at a base station having said receiver equipment, for each connection, is used as a criterion for assigning the correlators to respective connections in such a way that if the signal-to-noise ratio drops below a given threshold over a connection, the number of correlators assigned to the respective connection is increased, provided that there are free correlators available, and correspondingly, if the signal-to-noise ratio of the respective connection is improved, the number of correlators assigned to the respective connection can be decreased.

5. The base station receiver equipment according to claim 1, wherein:

a signal-to-noise ratio measured at a base station having said receiver equipment, for each connection, is used as a criterion for assigning the correlators to the respective connections in such a way that the base station measures the signal-to-noise ratio as a function of the number of said correlators and assigns the branches to the connections in such a way that the minimum quality of the connections will be maximized.

6. The base station receiver equipment according to claim 1, wherein:

a bit error ratio measured at a base station having said receiver equipment, for each connection, is used as a criterion for assigning the correlators to respective connections in such a way that if the bit error ratio drops below a given threshold over a connection, the number of correlators assigned to the respective connection is increased, provided that there are free correlators available, and correspondingly, if the bit error ratio of the respective connection is improved, the number of correlators assigned to the respective connection can be decreased.