Method of transmitting channel information in wireless communication system
First Claim
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1. A method of transmitting channel information in a time division duplex (TDD) wireless communication system, the method comprising:
- receiving, at a user equipment from a base station, downlink data included in a radio frame, wherein the radio frame includes two subframes, each of the two subframes including one uplink time slot and six downlink time slots, each of the six downlink time slots including two data symbols and a midamble, wherein the downlink data is included in a plurality of downlink time slots, of the six downlink time slots, and wherein the downlink data is received through a high speed downlink shared channel (HS-DSCH);
obtaining, at the user equipment, received signal strength indications (RSSIs) of a plurality of midambles for the plurality of downlink time slots according to the equation Ai=√
{square root over (I2+Q2)}, wherein Ai denotes an RSSI of a midamble for an ith downlink time slot of the plurality of downlink time slots, wherein I denotes an in-phase component of the midamble for the ith downlink time slot, and wherein Q denotes a quadrature-phase component of the midamble for the ith downlink time slot;
obtaining, at the user equipment, a moving average of the RSSIs of the plurality of midambles according to the equation
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Abstract
A method of transmitting channel information in a wireless communication system includes generating a channel quality indicator (CQI) including a channel variation indicating temporal changes in downlink channel condition, and transmitting the CQI through an uplink physical channel. Since a modulation and coding scheme is determined by considering changes in channel environment, reception performance of a user equipment can be improved and reliable service can be provided.
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Citations
7 Claims
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1. A method of transmitting channel information in a time division duplex (TDD) wireless communication system, the method comprising:
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receiving, at a user equipment from a base station, downlink data included in a radio frame, wherein the radio frame includes two subframes, each of the two subframes including one uplink time slot and six downlink time slots, each of the six downlink time slots including two data symbols and a midamble, wherein the downlink data is included in a plurality of downlink time slots, of the six downlink time slots, and wherein the downlink data is received through a high speed downlink shared channel (HS-DSCH); obtaining, at the user equipment, received signal strength indications (RSSIs) of a plurality of midambles for the plurality of downlink time slots according to the equation Ai=√
{square root over (I2+Q2)}, wherein Ai denotes an RSSI of a midamble for an ith downlink time slot of the plurality of downlink time slots, wherein I denotes an in-phase component of the midamble for the ith downlink time slot, and wherein Q denotes a quadrature-phase component of the midamble for the ith downlink time slot;obtaining, at the user equipment, a moving average of the RSSIs of the plurality of midambles according to the equation - View Dependent Claims (2, 3, 4, 5, 6)
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7. A user equipment in a time division duplex (TDD) wireless communication system, the user equipment comprising:
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a radio frequency (RF) unit configured for transmitting and receiving a radio signal; and a processor coupled to the RF unit, and configured for; receiving, from a base station, downlink data included in a radio frame, wherein the radio frame includes two subframes, each of the two subframes including one uplink time slot and six downlink time slots, each of the six downlink time slots including two data symbols and a midamble, wherein the downlink data is included in a plurality of downlink time slots, of the six downlink time slots, and wherein the downlink data is received through a high speed downlink shared channel (HS-DSCH); obtaining received signal strength indications (RSSIs) of a plurality of midambles for the plurality of downlink time slots according to the equation Ai=√
{square root over (I2+Q2)}, wherein Ai denotes an RSSI of a midamble for an ith downlink time slot of the plurality of downlink time slots, wherein I denotes an in-phase component of the midamble for the ith downlink time slot, and wherein Q denotes a quadrature-phase component of the midamble for the ith downlink time slot;obtaining a moving average of the RSSIs of the plurality of midambles according to the equation
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Specification