Method and apparatus for conveying precoding information in a MIMO system
First Claim
1. A method in a first node of conveying precoding information in a control message to a second node, the control message containing information that describes properties of an associated wireless data transmission between the first and second nodes employing spatial multiplexing and precoding information for sending codewords corresponding to transport blocks in said wireless data transmission, comprising the steps of:
- determining precoding parameters to be included in said control message to the second node;
encoding control information bits in at least one precoding information field of the control message according to the determined precoding parameters based on values in payload size related fields in the control message, wherein said payload size related field values are used to indicate that a first codeword is enabled while a second codeword is disabled, or that two codewords are enabled, whereby an interpretation of said control information bits in the precoding information field(s) is determined based on whether one or two codewords are enabled; and
sending said control message with said precoding information and payload size related fields to the second node.
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Abstract
Method and apparatus for conveying precoding information in a control message (M) from a first node (400) to a second node (402), with information on properties of an associated wireless data transmission (D) between the first and second nodes employing spatial multiplexing and precoding for the data transmission. The first node determines precoding parameters (P) for signal transmission to the receiving node, optionally based on feedback reports (F) from the receiving node. The first node encodes control information bits in precoding information fields of the control message by means of values in TBS fields of the control message, such that the TBS field values determine the interpretation of the bits in the precoding information field(s). The control message (M) is then sent to the second node.
16 Citations
40 Claims
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1. A method in a first node of conveying precoding information in a control message to a second node, the control message containing information that describes properties of an associated wireless data transmission between the first and second nodes employing spatial multiplexing and precoding information for sending codewords corresponding to transport blocks in said wireless data transmission, comprising the steps of:
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determining precoding parameters to be included in said control message to the second node; encoding control information bits in at least one precoding information field of the control message according to the determined precoding parameters based on values in payload size related fields in the control message, wherein said payload size related field values are used to indicate that a first codeword is enabled while a second codeword is disabled, or that two codewords are enabled, whereby an interpretation of said control information bits in the precoding information field(s) is determined based on whether one or two codewords are enabled; and sending said control message with said precoding information and payload size related fields to the second node. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus in a first node, for conveying precoding information in a control message to a second node, the control message containing information that describes properties of an associated wireless data transmission between the first and second nodes employing spatial multiplexing and precoding information for sending codewords corresponding to transport blocks in said wireless data transmission, comprising:
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a processor configured to determine precoding parameters to be included in said control message to the second node; an encoder configured to encode control information bits in at least one precoding information field of the control message according to the determined precoding parameters based on values in payload size related fields in the control message, wherein the payload size related field values are used to indicate that a first codeword is enabled while a second codeword is disabled, or that two codewords are enabled, whereby an interpretation of said control information bits in the precoding information field(s) is determined based on whether one or two codewords are enabled; and a transceiver configured to send said control message with said precoding information and payload size related fields to the second node. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method in a second node of obtaining precoding information in a control message from a first node, the control message containing information that describes properties of an associated wireless data transmission between the first and second nodes employing spatial multiplexing and precoding information for sending codewords corresponding to transport blocks in said wireless data transmission, comprising the steps of:
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receiving said control message including precoding parameters determined by the first node; and detecting said precoding parameters by decoding control information bits in at least one precoding information field of the control message based on values in payload size related fields in the control message, wherein said values are used to indicate that a first codeword is enabled while a second codeword is disabled, or that two codewords are enabled, whereby an interpretation of said control information bits in the precoding information field(s) is determined based on whether one or two codewords are enabled. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. An apparatus in a second node of obtaining precoding information in a control message from a first node, the control message containing information that describes properties of an associated wireless data transmission between the first and second nodes employing spatial multiplexing and precoding information for sending codewords corresponding to transport blocks in said wireless data transmission, comprising:
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a transceiver configured to receive said control message including precoding parameters determined by the first node; and a decoder configured to detect said precoding parameters by decoding control information bits in at least one precoding information field of the control message based on values in payload size related fields in the control message, wherein said values are used to indicate that a first codeword is enabled while a second codeword is disabled, or that two codewords are enabled, whereby an interpretation of said control information bits in the precoding information field(s) is determined based on whether one or two codewords are enabled. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40)
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Specification