METHODS AND APPARATUS FOR DOWNLINK PDSCH POWER SETTING
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Abstract
In a communication system, a base station transmits power setting information in a downlink Physical Downlink Shared Channel (PDSCH). A mapping scheme between overhead signals and reference signal (RS) overhead ratios, and the traffic-to-pilot ratios (T2P) calculation methods are established. A user-specific T2P ratio for certain OFDM symbols, a RS overhead ratio and a calculation method selected from the plurality of T2P calculation methods are assigned to a wireless terminal. An overhead signal corresponding to the assigned RS overhead ratio and the assigned T2P calculation method is selected in accordance with the mapping scheme and transmitted to the wireless terminal. In addition, the user-specific traffic-to-pilot ratio is transmitted to the wireless terminal. The wireless terminal calculates the traffic-to-pilot ratios across different transmission antennas and different OFDM symbols based on the received traffic-to-pilot ratio, the RS overhead ratio and the T2P calculation method indicated by the RS overhead signal.
11 Citations
53 Claims
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1-21. -21. (canceled)
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22. A method of determining a downlink transmit power from a base station at a wireless terminal, the base station and the wireless terminal having a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols available for transmission, the method comprising:
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receiving a cell-specific parameter (PB) signaled by one or more higher layers from the base station; and determining a cell-specific ratio (ρ
B/ρ
A) of a first ratio of traffic data to pilot (T2P) for first OFDM symbols (denoted as ρ
B) to a second ratio of T2P for second OFDM symbols (denoted as ρ
A), based on the cell-specific parameter and a number of cell-specific antenna ports configured in the base station. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29)
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30. An apparatus of a wireless terminal for determining a downlink transmit power from a base station, the base station and the wireless terminal having a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols available for transmission, the apparatus comprising:
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an antenna unit configured to receive a cell-specific parameter (PB) signaled by one or more higher layers from the base station; and a power setting unit configured to determine a cell-specific ratio (ρ
B/ρ
A) of a first ratio of traffic data to pilot (T2P) for first OFDM symbols (denoted as ρ
B) to a second ratio of T2P for second OFDM symbols (denoted as ρ
A), based on the cell-specific parameter and a number of cell-specific antenna ports configured in the base station. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37)
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38. A method of determining a downlink transmit power for wireless terminals at a base station, the base station and the wireless terminals having a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols available for transmission, the method comprising:
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transmitting a cell-specific parameter (PB) signaled by one or more higher layers to wireless terminals in a cell; and transmitting traffic data by using one of a first ratio of traffic data to pilot (T2P) for first OFDM symbols (denoted as ρ
B) and a second ratio of T2P for second OFDM symbols (denoted as ρ
A),wherein a cell-specific ratio (ρ
B/ρ
A) of the first ratio to the second ratio is determined based on the cell-specific parameter and a number of cell-specific antenna ports configured in the base station. - View Dependent Claims (39, 40, 41, 42, 43, 44, 45)
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46. An apparatus of a base station for determining a downlink transmit power for wireless terminals, the base station and the wireless terminals having a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols available for transmission, the apparatus comprising:
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an antenna unit configured to transmit a cell-specific parameter (PB) signaled by one or more higher layers to wireless terminals in a cell; and a transmitter configured to transmit traffic data by using one of a first ratio of traffic data to pilot (T2P) for first OFDM symbols (denoted as ρ
B) and a second ratio of T2P for second OFDM symbols (denoted as ρ
A),wherein a cell-specific ratio (ρ
B/ρ
A) of the first ratio to the second ratio is determined based on the cell-specific parameter and a number of cell-specific antenna ports configured in the base station. - View Dependent Claims (47, 48, 49, 50, 51, 52, 53)
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Specification