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Microcell load measurement using feedback control
| Details |
Inventors: Lee, David Y.;
Assignee: Lucent Technologies, Inc. (Murray Hill, NJ)
Primary Examiner: To; Doris H.
Assistant Examiner:
Attorney, Agent or Firm: Synnestvedt & Lechner
A method and system are disclosed for determining load on a microcell in a telecommunications network. The network comprises a base station, at least one microcell controlled by the base station, at least one terminal served by the microcell, and feedback between the base station and the terminal. The feedback enables the terminal to provide an up-link signal indicative of a particular down-link signal from the microcell. The method embodiment of the invention involves transmitting a particular down-link signal from the microcell, and receiving an up-link signal from a terminal. Next, a determination is made whether the up-link signal is indicative of the particular down-link signal. If it is, then the load on the microcell includes the terminal. The method and system are particularly useful in CATV networks having a plurality of microcells operating in a simulcast mode. In one preferred embodiment, the microcell transmits the particular down-link signal in a certain pattern, if the up-link signals of the terminal reflect the pattern of the particular down-link signal, then its load on the microcell is confirmed. Once the load of a microcell is determined, then the network may be optimized for capacity and quality. In one embodiment, optimization is performed by altering the RF carrier among the microcells to balance load in the network. |
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DETAILED DESCRIPTION OF THE PRESENT INVENTION The present invention relates to a method and system for dynamically determining the subscriber load on a microcell in a wireless system.
The invention may be practiced in any wireless system recognizing feedback from a subscriber's terminal.
A suitable system 100 is depicted in FIG.
1.
In that figure, a mobil switching center (MSC) 104 controls a base station 103 over a communicative link 110 that may be a landwire or wireless link.
The base station 103, in turn, employs a plurality of microcells 101 to broadcast and receive signals at the same frequency over an area 120.
As used herein, the term "mircocell" broadly refers to a subdivision of a cell served by a base station.
Communication between the base station and a microcell occurs over a link 111, which may be fiber optic, metallic, coaxial, wireless channels, or other suitable means depending upon the application.
The microcells of a cell typically simulcast at the same frequency thereby effectively expanding the area that a given base station may serve.
Examples of microcells include repeaters, reradiators, and CATV remote antenna drivers (RADs) (described in detail below).
A particular microcell 101a serves a set of subscriber terminals 102.
The term "terminal" as used herein broadly refers to any wireless device used by a user to receive and transmit signals in a wireless system.
The terminal should be capable of transmitting a signal responsive to the signal it receives.
Suitable terminals are well known in the art and include cellular handsets and wireless modems.
Wireless communication occurs between the subscriber terminals 102 and the microcell 101.
Down-link (or forward) signals 112 propagate from the MSC 104 to the subscriber terminal 102, and up-link (or reverse) signals 113 propagate from the subscriber terminal 102 to the MSC 104.
The system also includes a feedback means (not shown) which enables the terminal 102 to provide an up-link response indicative of a particular down-link signal
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Fault Detection 
