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System and method using adaptive antennas to selectively reuse common physical channel timeslots for dedicated channels
| Details |
Inventors: Roy, Vincent; Marinier, Paul;
Assignee: InterDigital Technology Corporation (Wilmington, DE)
Primary Examiner: D'Agosta; Steve M.
Assistant Examiner:
Attorney, Agent or Firm: Volpe and Koenig, P.C.
A method and communication system (e.g., a time-division duplex (TDD) system) that uses adaptive antennas at the base stations to monitor metrics associated with the quality of one or more common physical channel (CPCH) timeslots, so as to determine whether to reuse some or all of the CPCH timeslots to transmit a dedicated physical channel (DPCH). If it is determined to reuse some or all of the CPCH timeslots, an additional determination is made as to what limit to apply on the DPCH transmission powers. Adaptive antennas may be used at the base stations to allow the system to reuse some or all of the CPCH timeslots to transmit DPCH, thus improving the overall capacity of the system while maintaining the CPCH coverage and quality at a desired level throughout the system. |
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Presently preferred embodiments are described below with reference to the drawing figures wherein like numerals represent like elements throughout.
While the description that follows is specifically explained as applicable to TDD and time division synchronous code-division multiple access (TD-SCDMA), it is to be noted that the invention in its broad form is also applicable to other systems of transmission, without limitation.
Hereafter, a wireless transmit/receive unit (WTRU) includes but is not limited to a user equipment, mobile station, fixed or mobile subscriber unit, pager, or any other type of device capable of operating in a wireless environment.
When referred to hereafter, a base station includes but is not limited to a base station, Node-B, site controller, access point or other interfacing device in a wireless environment.
Described hereinafter is an exemplary embodiment of a method and system which show how adaptive antennas in a communication system can be used at the base stations to allow the system to reuse at least some of the CPCH timeslots to transmit DPCH, as shown in FIG.
2, thus improving the overall capacity of the system while maintaining the CPCH coverage and quality at a desired level throughout the system.
However, caution must be taken to avoid carelessly reusing the CPCH timeslots to transmit DPCH signals in the same subsystem, which could lead to CPCH signals with high interference and thus cause CPCH reception problems for mobile users in some regions.
Some consequences resulting from poor CPCH reception include unacceptable delays for users to access the RAN, degradation of key radio resource management functions (e.
g.
, such as handoffs and power control) and service holes for the CPCH.
It is noted that even though the described example refers to a TDD system, the inventive method and system are equally applicable to other systems of transmission, such as TDS CDMA.
FIG.
3 shows an exemplary communication system 300 operating in accordance with the present invention
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