Transceiver tester

• US 5,768,689 A
• Filed: 04/03/1995
• Issued: 06/16/1998
• Est. Priority Date: 04/03/1995
• Status: Expired due to Fees

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Borg, Gunnar
• Primary Examiner(s): VO, NGUYEN THANH
• Application Number:
  US08/414,645
• Time in Patent Office: 1,170 Days
• Field of Search: 455/33.1, 455/54.1, 455/63, 455/67.1, 455/67.3, 455/67.4, 455/88, 455/9, 455/561, 455/434, 455/515, 455/67.7, 379/4, 379/5, 379/21
• US Class Current: 455/67.14
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements

Abstract

A test loop is provided in a cellular network for testing and supervising a complete chain of radio equipment needed to carry cellular traffic from a radio base station. A software modified mobile station including a transceiver test unit is cable connected between transmitter and receiver parts in a radio base station. Logic is introduced in the base station controller to establish connections to the mobile station on all traffic channels in the cell and evaluate measurement reports from the transceiver test unit and receiver. If signal strength and/or bit error rate are not within a predefined expected interval, an alarm is given in the base station controller. Also, reports can be provided on the measured signal strength and bit error rate on all traffic channels in the cell. The transceiver test can be initiated by periodic command. In addition, statistics on traffic in the cell can be evaluated to determine abnormal behavior in the cell which results in automatic initiation of a transceiver test. Continuous supervision is provided in the cell to accomplish fast fault detection and fault localization, thus lowering costs, minimizing cellular traffic down time and increasing quality of service for the end user.

Claims

1. A method of supervising and testing radio equipment in a radio base station used to carry cellular traffic comprising the steps of:

establishing traffic connections between a transceiver test unit in a mobile station and a base transceiver station on all traffic channels in a cell; and

evaluating signal strength and bit error rates on all idle traffic channels, wherein if signal strength and bit error rates are outside a predetermined interval, the radio equipment is determined to be faulty and an alarm is given in the base station.

2. The method of claim 1, wherein discontinuous transmission to the transceiver test unit is disabled.

3. A method of supervising and testing radio equipment in a radio base station used to carry cellular traffic, comprising the steps of:

establishing traffic connections between a transceiver test unit in a mobile station and a base transceiver station on all traffic channels in a cell; and

evaluating traffic statistics in a cell, wherein if traffic statistics are evaluated as abnormal, a transceiver test is automatically initiated and signal strength and bit error rates are evaluated on all idle traffic channels, and if the signal strength and bit error rates are outside a predetermined interval, the radio equipment is determined to be faulty and an alarm is given in the base station.

4. A system for supervising and testing radio equipment in a radio base station used to carry cellular traffic, comprising:

means for establishing traffic connections between a transceiver test unit in a mobile station and a base transceiver station on all traffic channels in a cell; and

means for evaluating signal strength and bit error rates on all idle traffic channels, determining that the radio equipment is faulty if the signal strength and bit error rates are outside a predetermined interval, and giving an alarm in the base station if the radio equipment is determined to be faulty.

5. The system of claim 4, main wherein discontinuous transmission to the transceiver test unit is disabled.

6. A system for evaluating statistics on traffic in a cell in a cellular network, comprising:

means for establishing traffic connections between a transceiver test unit in a mobile station and a base transceiver station on all traffic channels in the cell;

means for evaluating traffic statistics in the cell, which automatically initiates a transceiver test if traffic statistics in the cell are evaluated as abnormal; and

means for evaluating signal strength and bit error rates on all idle traffic channels in response to initiation of a transceiver test, determining that equipment in the cell is faulty if the signal strength and bit error rates are outside a predetermined interval, and giving an alarm in the cell if the radio equipment is determined to be faulty.