Method for inter-cell interference coordination with power planning for OFDM mobile communication system

  • US 20050265222A1
  • Filed: 04/20/2005
  • Published: 12/01/2005
  • Est. Priority Date: 05/04/2004
  • Status: Active Grant
First Claim
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1. Method for inter-cell interference coordination with power planning in a radio communication system employing multi-carrier techniques such as OFDM for the air interface communication between a network and a plurality of user terminals, the network comprising a plurality of base stations having means for communication with the user terminals located inside their cell service area, the cells arranged following an adjacent cell pattern, where neighbor cells do not have the same number and cells with the same number are separated by at least one cell in-between, for resource planning purposes, each cell having an inner cell region and a border cell region in which inter-cell interference is affecting the quality of service received by a user terminal, wherein an OFDM wireless communication channel is designed so that a terminal can receive at least two pilot channels in parallel, one for each cell service area interfering at the border cell region, an OFDM time-frequency grid is partitioned in a number of orthogonal, non-overlapping time-frequency patterns, and said time-frequency patterns are grouped in a number of disjunct subsets or time-frequency groups, the number of disjunct subsets corresponding to the number of different cells from the cell pattern for resource planning, in each cell all time-frequency groups are used for communication with the terminals, but emission within a determined time-frequency group corresponding to the cell number is done with reduced power limited to a certain power value which is smaller than a maximum power available for transmission within the time-frequency groups, when a terminal moves from an inner cell region of a serving cell to the border cell region of said cell and in the direction of a neighbor cell, it measures pilot signals from the interfering neighbor cells in that region and reports to the mobile radio network information about the strength of reception from these cell pilot signals, based on the terminal information an network criteria, the mobile radio network assigns to the terminal time-frequency patterns of the time-frequency group with which said neighbor cell emits with limited power.

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