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Transceiver site selection a cellular communications system
| Details |
Inventors: Hagstrom, Ulf E.; Isaksson, Magnus B.;
Assignee: Telefonaktiebolaget LM Ericsson (Stockholm, SE)
Primary Examiner: Eisenzopf; Reinhard J.
Assistant Examiner: Banks-Harold; Marsha D.
Attorney, Agent or Firm: Burns, Doane, Swecker & Mathis, L.L.P.
In a cellular communications system having a plurality of cells, each cell being served by at least one of a plurality of existing base stations, a method of determining a location for a new micro base station antenna involves first providing a test antenna at a test location in one of the cells. Then, for a predetermined time period, a monitoring procedure is performed to assess how many mobile stations are close enough to the test location that they would be served by a micro cell having a base transceiver antenna at the test location. The monitoring procedure involves, in the test antenna, receiving an uplink access attempt signal that is transmitted from a mobile station to an intended one of the existing base stations. Then, signal strength of the received uplink access attempt signal is measured and compared to a predetermined threshold level. If the measured signal strength is greater than the predetermined threshold level, then a count value is incremented. After performing the monitoring procedure, the count value is compared to a predetermined count value. If the count value is higher than the predetermined count value, then the new micro base station is established at the test location. In an alternative embodiment of the invention, the monitoring procedure is performed at several test locations. The new micro base station is then established at that one of the test locations that has the highest count value. |
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DETAILED DESCRIPTION The various features of the invention will now be described with respect to the figures, in which like parts are identified with the same reference characters.
Referring to FIG.
2A, a block diagram of a test unit 200 for determining the suitability of a test site for use as a new base transceiver antenna site in accordance with the present invention is shown.
The test unit 200 includes an antenna 201 coupled to a receiver 203.
The operation of the receiver 203 (i.
e.
, what frequencies to listen to, etc.
) is controlled by a processor 205.
The processor 205 is also coupled to an output of the receiver 203, and is configured to analyze the nature of a communication conveyed by the received signal.
The test unit 200 further includes a signal strength measurement unit 211 coupled to the receiver 203 and to the processor 205, and may also include memory means 207 (e.
g.
, random access memory, or a disk storage unit) coupled to the processor 205 to allow collected data to be stored for later use.
The test unit 200 still further preferably includes an input/output (I/O) unit 209 to allow an operator to input commands and data operands, and to permit the operator to obtain the empirical results of a test.
The operation of the inventive test unit 200 will now be described with reference to FIGS.
3 and 4.
Three cells C1, C2, C3 in a cellular communications system are shown.
The cells are served, respectively, by RBS1, RBS2 and RBS3.
It is presumed, for the sake of this example, that it is proposed to add a new micro cell C4 to the system.
The test unit 200 has been placed somewhere near the periphery of cell C1 in order to determine whether this would be a good spot for the proposed new base transceiver antenna.
Whether this is a good location will depend, at least in part, on how many MSs there usually are within the boundaries of the proposed new micro cell C4.
The test unit 200 works by listening to one or more of the uplink (i.
e.
, from MS to RBS) control channel (i.
e.
, access channel) frequencies
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Adhesives and Rubbers 
