Method and apparatus for bit mapping enhanced-dedicated physical control channel (E-DPCCH) information in UMTS wireless communication system
AssigneeAlcatel-Lucent USA Inc.
InventorsRainer Bachl, Florian Derriennic, Francis Dominique, Hongwei Kong, Said Tatesh
Life of this patent
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Abstract
In a 3GPP standards Release 6 UMTS system, in order to avoid searching at NodeB for a maximum E-DPCCH-associated metric at discrete possible valid index values, or over disjoint possible valid index regions, at the UE the three different sources of information, the fixed number bits that comprise the RSN, TFI and the H-bit components of the E-DPCCH bit field, are mapped so that the decimal equivalents of the possible E-DPCCH indices lie within a continuous range of values.
Claims12
A method of combining a plurality of fixed-bit-length input words into a single multi-bit codeword, the method comprising:
- mapping the bits of the input words into the single multi-bit codeword in a manner such that the decimal equivalents of the combined single multi-bit codewords formed from all allowed combinations of different input words lie within a continuous range of values, the number of allowed combinations of different input words being less than the maximum number of different values in decimal that the multi-bit codeword could possibly have.
A method at a transmitter in a wireless communications system of combining a fixed-length Happy (H) indicator, a fixed-length Retransmission Sequence Number (RSN), and a fixed-length Transport Format Indicator (TFI) into a combined fixed-length multi-bit codeword for transmission in a frame on a control channel, the method comprising:
- mapping the fixed number of bits of the Happy indicator, the fixed number of bits of the RSN, and the fixed number of bits of the TFI into a combined fixed-length multi-bit codeword such that the decimal equivalents of the combined codewords formed from all allowed combinations of the Happy indicator, the RSN and TFI lie within a continuous range of values, the number of allowed combinations of the Happy indicator, the RSN, and TFI being less than the maximum number of different values in decimal that the combined fixed-length multi-bit codeword could possibly have.
Apparatus for combining a plurality of fixed-bit-length input words into a single multi-bit codeword, the method comprising:
- means for receiving the plurality of fixed-bit-length input words;
- and
- means for mapping the bits of the input words into the single multi-bit codeword in a manner such that the decimal equivalents of the combined single multi-bit codewords formed from all allowed combinations of different input words lie within a continuous range of values, the number of allowed combinations of different input words being less than the maximum number of different values in decimal that the multi-bit codeword could possibly have.
Apparatus at a transmitter in a wireless communications system for combining a fixed-length Happy indicator, a fixed-length Retransmission Sequence Number (RSN), and a fixed-length Transport Format Indicator (TFI) into a combined fixed-length multi-bit codeword for transmission in a frame on a control channel, the apparatus comprising:
- means for receiving the Happy indicator, the RSN and the TFI;
- and
- means for mapping the fixed number of bits of the Happy indicator, the fixed number of bits of the RSN, and the fixed number of bits of the TFI into a combined fixed-length multi-bit codeword such that the decimal equivalents of the combined codewords formed from all allowed combinations of the Happy indicator, the RSN and TFI lie within a continuous range of values, the number of allowed combinations of the Happy indicator, the RSN, and TFI being less than the maximum number of different values in decimal that the combined fixed-length multi-bit codeword could possibly have.
Dependencies are inferred from the claim text.