Methods and apparatus for subframe configuration and generation in a multi-carrier communication system
AssigneeGuangdong Oppo Mobile Telecommunications Corp., Ltd.
InventorsXiaodong Li, Titus Lo, Kemin Li, Haiming Huang
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Abstract
Methods and apparatus for subframe configuration and generation in a multi-cell multi-carrier system. A frame for radio transmission in the system consists of multiple subframes, and each subframe consists of multiple Orthogonal Frequency Division Multiplexing (OFDM) symbols. Training symbols, frequency-domain data scrambling, size of Fast-Fourier Transform (FFT), or length of cyclic prefix can be configured differently for each subframe to facilitate different applications, such as unicasting or broadcasting.
Claims16
A method for a base station in a cell of a wireless system using a transmission frame structure, each frame comprising a plurality of subframes, each subframe comprising a plurality of time slots, each time slot comprising a plurality of orthogonal frequency division multiplexing (OFDM) symbols, the method comprising:
- broadcasting a signal containing a cell identity associated with the cell;
- scrambling data before modulation based on the cell identity;
- modulating the scrambled data to produce modulated data symbols;
- mapping the modulated data symbols to a plurality of OFDM subcarriers in a subchannel, wherein the plurality of OFDM subcarriers are within a frequency channel in a time slot;
- transmitting data over the subchannel to a mobile station in the cell;
- and
- transmitting pilot symbols with the data, wherein the pilot symbols are mapped to one or more OFDM subcarriers in the frequency channel based on the cell identity.
A base station in a cell of a wireless system using a transmission frame structure, each frame comprising a plurality of subframes, each subframe comprising a plurality of time slots, each time slot comprising a plurality of orthogonal frequency division multiplexing (OFDM) symbols, the base station comprising:
- a transmitter configured to:
- broadcast a signal containing a cell identity associated with the cell;
- transmit data over a plurality of orthogonal frequency division multiplexing (OFDM) subcarriers in a subchannel to a mobile station in the cell, wherein the plurality of OFDM subcarriers are within a frequency channel in a time slot;
- and
- transmit pilot symbols with the data, wherein the pilot symbols are mapped to one or more OFDM subcarriers in the frequency channel based on the cell identity;
- and
- a controller configured to:
- scramble the data before modulation based on the cell identity;
- modulate the scrambled data to produce modulated data symbols;
- and
- map the modulated data symbols to the plurality of OFDM subcarriers in the subchannel.
A method for a mobile station in a cell of a wireless system, the method comprising:
- transmitting an uplink signal to a base station in the cell, the uplink signal carrying control information, data packets, or both control information and data packets;
- receiving, from the base station, a signal containing a cell identity associated with the cell;
- receiving, from the base station, data over a subchannel containing a plurality of orthogonal frequency division multiplexing (OFDM) subcarriers within a frequency channel in a time slot, wherein:
- the received data were scrambled before modulation based on the cell identity;
- the scrambled data were modulated to produce modulated data symbols;
- and
- the modulated data symbols were mapped to the plurality of OFDM subcarriers in the subchannel;
- and
- receiving, from the base station, pilot symbols with the received data, wherein the pilot symbols were mapped to one or more OFDM subcarriers in the frequency channel based on the cell identity.
A mobile station in a cell of a wireless system, the mobile station comprising:
- a transmitter configured to transmit an uplink signal to a base station in the cell, the uplink signal carrying at least one of control information or data packets;
- and
- a receiver configured to:
- receive, from the base station, a signal containing a cell identity associated with the cell;
- and
- receive, from the base station, data over a subchannel containing a plurality of orthogonal frequency division multiplexing (OFDM) subcarriers within a frequency channel in a time slot, wherein:
- the received data were scrambled before modulation based on the cell identity;
- the scrambled data were modulated to produce modulated data symbols;
- and
- the modulated data symbols were mapped to the plurality of OFDM subcarriers in the subchannel;
- and
- receive, from the base station, pilot symbols with the received data, wherein the pilot symbols were mapped to one or more OFDM subcarriers in the frequency channel based on the cell identity.
Dependencies are inferred from the claim text.