Arrangement and method for channel mapping in a wireless communication system
First Claim
1. A base station for operating in a wireless communication system, the base station comprising:
- first interleaving logic for interleaving a bit sequence comprising systematic bits to produce an interleaved systematic bit sequence;
second interleaving logic for interleaving a bit sequence comprising parity bits to produce an interleaved parity bit sequence;
grouping logic to produce symbols from bits from the interleaved systematic bit sequence and bits from the interleaved parity bit sequence, wherein bits from the interleaved systematic bit sequence are mapped to high reliability bits of the symbols and bits from the interleaved parity sequence are mapped to low reliability bits of the symbols; and
mapping logic for mapping the symbols to an odd indexed physical channel in a forward direction and an even indexed physical channel in a reverse direction.
2 Assignments
0 Petitions
Accused Products
Abstract
An arrangement and method for channel mapping in a UTRA TDD HSDPA wireless communication system by applying interleaving functions in first (530) and second (540) interleaving means to a bit sequence to produce symbols for mapping to physical channels, the first and second interleaving means being arranged to map symbols from respectively systematic and parity bits in a predetermined scheme, e.g., mapping symbols in a forward direction when a channel has an even index number, and in a reverse direction when a channel has an odd index number. The symbols may comprise bit-pairs, each of a systematic bit and parity bit.
Systematic bits are preferably mapped to high reliability bit positions in TDD HSDPA, achieving a performance gain of between 0.2 dB and 0.5 dB. The forwards/reverse mapping allows a degree of interleaving that improves system performance in fading channels or channels disturbed by short time period noise or interference.
16 Citations
42 Claims
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1. A base station for operating in a wireless communication system, the base station comprising:
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first interleaving logic for interleaving a bit sequence comprising systematic bits to produce an interleaved systematic bit sequence; second interleaving logic for interleaving a bit sequence comprising parity bits to produce an interleaved parity bit sequence; grouping logic to produce symbols from bits from the interleaved systematic bit sequence and bits from the interleaved parity bit sequence, wherein bits from the interleaved systematic bit sequence are mapped to high reliability bits of the symbols and bits from the interleaved parity sequence are mapped to low reliability bits of the symbols; and mapping logic for mapping the symbols to an odd indexed physical channel in a forward direction and an even indexed physical channel in a reverse direction. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A mobile user equipment for operating in a wireless communication system, the mobile user equipment comprising:
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first interleaving logic for interleaving a bit sequence comprising systematic bits to produce an interleaved systematic bit sequence; second interleaving logic for interleaving a bit sequence comprising parity bits to produce an interleaved parity bit sequence; grouping logic to produce symbols from bits from the interleaved systematic bit sequence and bits from the interleaved parity bit sequence, wherein bits from the interleaved systematic bit sequence are mapped to high reliability bits of the symbols and bits from the interleaved parity sequence are mapped to low reliability bits of the symbols; and mapping logic for mapping the symbols to an odd indexed physical channel in a forward direction and an even indexed physical channel in a reverse direction. - View Dependent Claims (9, 10, 11, 12)
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13. A mobile user equipment for channel de-mapping in a wireless communication system, the mobile user equipment comprising:
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de-mapping logic for de-mapping symbols in a forward direction to an odd indexed physical channel or de-mapping symbols in a reverse direction to an even indexed physical channel; ungrouping logic arranged to ungroup groups of bits from symbols to produce an interleaved parity bit sequence and an interleaved systematic bit sequence, each symbol comprising parity bits and systematic bits; first deinterleaving logic for deinterleaving the systematic bit sequence to produce a deinterleaved systematic bit sequence comprising systematic bits; and second deinterleaving logic for deinterleaving the parity bit sequence to produce a deinterleaved parity bit sequence comprising parity bits. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A base station for channel de-mapping in a wireless communication system, the base station comprising:
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de-mapping logic for de-mapping symbols in a forward direction to an odd indexed physical channel or de-mapping symbols in a reverse direction to an even indexed physical channel; ungrouping logic arranged to ungroup groups of bits from symbols to produce an interleaved parity bit sequence and an interleaved systematic bit sequence, each of the symbols comprising parity bits and systematic bits; first deinterleaving logic for deinterleaving the systematic bit sequence to produce a deinterleaved systematic bit sequence comprising systematic bits; and second deinterleaving logic for deinterleaving the parity bit sequence to produce a deinterleaved parity bit sequence comprising parity bits. - View Dependent Claims (21, 22, 23, 24, 25, 26)
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27. A method for channel mapping in a wireless communication system, the method comprising:
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interleaving a bit sequence comprising systematic bits to produce an interleaved systematic bit sequence; interleaving a bit sequence comprising parity bits to produce an interleaved parity bit sequence; grouping bits from the interleaved systematic bit sequence and the interleaved parity bit sequence to produce symbols, each of the symbols comprising parity bits and systematic bits, wherein bits from the interleaved systematic bit sequence are mapped to high reliability bits of the symbols and bits from the interleave parity bit sequence are mapped to low reliability bits of the symbols; and mapping logic for mapping the symbols to an odd indexed physical channel in a forward direction and an even indexed physical channel in a reverse direction. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34)
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35. A method for channel de-mapping in a wireless communication system, the method comprising:
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de-mapping logic for de-mapping symbols in a forward direction to an odd indexed physical channel or de-mapping symbols in a reverse direction to an even indexed physical channel; ungrouping groups of bits from symbols to produce an interleaved parity bit sequence and an interleaved systematic bit sequence, each symbol comprising systematic bits and parity bits; deinterleaving the systematic bit sequence to produce a deinterleaved systemic bit sequence comprising systematic bits; and deinterleaving the parity bit sequence to produce a deinterleaved parity bit sequence comprising parity bits, wherein bits from the deinterleaved systematic bit sequence have been mapped to high reliability bits of the symbol and bits from the deinterleaved parity bit sequence have been mapped to low reliability bits of the symbol. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42)
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Specification