Precoding and feedback channel information in wireless communication system
AssigneePantech Co., Ltd.
InventorsJianjun Li, Kyoungmin Park
Life of this patent
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Abstract
The present invention relates to precoding and feedback channel information in wireless communication system. A method includes receiving a first Precoding Matrix Index (PMI) and a second PMI from a terminal; mapping one or two codewords into layers; precoding symbols mapped into the layers using a first precoding matrix derived from the first PMI and a second precoding matrix derived from the second PMI; and transmitting the precoded symbols to the terminal, wherein the reception of the first PMI is less frequent than the reception of the second PMI.
Claims18
A communication method comprising:
- estimating a downlink channel based on a signal received from a base station;
- transmitting a first-precoding matrix index (PMI) to the base station periodically based on a first period;
- transmitting a second-PMI to the base station periodically based on a second period;
- and
- receiving, from the base station, a downlink signal which includes precoded data symbols,
- wherein the first period and the second period are different from each other.
A communication apparatus comprising:
- a processor;
- and
- a memory operably coupled to the processor,
- wherein the processor, when executing program instructions stored in the memory, is configured to:
- cause the apparatus to estimate a downlink channel based on a signal received from a base station;
- cause the apparatus to transmit a first-type precoding matrix index (PMI) to the base station periodically based on a first period;
- cause the apparatus to transmit a second-type PMI to the base station periodically based on a second period;
- and
- cause the apparatus to receive, from the base station, a downlink signal which includes precoded data symbols,
- wherein the first period and the second period are different from each other.
A mobile terminal comprising:
- a processor;
- and
- a memory operably coupled to the processor,
- wherein the processor, when executing program instructions stored in the memory, is configured to:
- cause the mobile terminal to estimate a downlink channel based on a signal received from a base station;
- cause the mobile terminal to transmit a first-type precoding matrix index (PMI) to the base station periodically based on a first period;
- cause the mobile terminal to transmit a second-type PMI to the base station periodically based on a second period;
- and
- cause the mobile terminal to receive, from the base station, a downlink signal which includes precoded data symbols,
- wherein the first period and the second period are different from each other.
Dependencies are inferred from the claim text.