Arrangement and method for channel mapping in a wireless communication system

• US 8,553,653 B2
• Filed: 11/04/2011
• Issued: 10/08/2013
• Est. Priority Date: 04/08/2002
• Status: Expired due to Term

• Current Assignee: Sisvel International S.A. (Fineur International S.A.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Beale, Martin
• Primary Examiner(s): Nguyen, Duc M
• Application Number:
  US13/289,621
• Publication Number:
  US 20120051271A1
• Time in Patent Office: 704 Days
• Field of Search: 370/335, 370/334, 370/204, 370/464, 370/476, 455/102, 455/103, 375/264, 375/298, 714/757, 714/780
• US Class Current: 370/335
• CPC Class Codes: H03M 13/27 using interleaving techniques
• CPC Class Codes: H03M 13/653 3GPP HSDPA, e.g. HS-SCCH or DS-DSCH related
• CPC Class Codes: H04L 1/0071 Use of interleaving interleaving per se H03M13/27
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 1/1893 Physical mapping arrangements physical resource mapping in general H04L5/00

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.

Claims

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; and

mapping logic for mapping bits in accordance with a modulation scheme such that;

bits from the interleaved systematic bit sequence are mapped to high reliability bits of the modulation scheme and bits from the interleaved parity sequence are mapped to low reliability bits of the modulation scheme, and

the systematic bits and the parity bits are mapped to physical channels in different ones of a forward direction and a reverse direction.

2. The base station of claim 1, wherein the modulation scheme includes bit-pairs each comprising a systematic bit and a parity bit.

3. The base station of claim 2, wherein the bit-pairs are arranged to be modulated by 16QAM modulation.

4. The base station of claim 2, wherein the wireless communication system is a Universal Terrestrial Radio Access Time Division Duplex (UTRA TDD) system.

5. The base station of claim 4, wherein the bit-pairs are mapped in an odd indexed physical channel in a forward direction and an even indexed physical channel in a reverse direction, and the odd and even indexed physical channels are comprised in a transport channel.

6. The base station of claim 1, configured to operate on a High Speed Downlink Shared Channel.

7. The base station of claim 6, configured to operate in High Speed Downlink Packet Access.

8. A mobile user equipment for operating in a wireless communication system, the mobile user equipment 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; and

mapping logic for mapping bits in accordance with a modulation scheme such that;

bits from the interleaved systematic bit sequence are mapped to high reliability bits of the modulation scheme and bits from the interleaved parity sequence are mapped to low reliability bits of the modulation scheme, and

the systematic bits and the parity bits are mapped to physical channels in different ones of a forward direction and a reverse direction.

9. The mobile user equipment of claim 8, wherein the modulation scheme includes bit-pairs each comprising a systematic bit and a parity bit.

10. The mobile user equipment of claim 8, wherein the bit-pairs are arranged to be modulated by 16QAM modulation.

11. The mobile user equipment of claim 8, wherein the wireless communication system is a Universal Terrestrial Radio Access Time Division Duplex (UTRA TDD) system.

12. The mobile user equipment of claim 11, wherein the bit-pairs are mapped in an odd indexed physical channel in a forward direction and an even indexed physical channel in a reverse direction, and the odd and even indexed physical channels are comprised in a transport channel.

13. A mobile user equipment for channel de-mapping in a wireless communication system, the mobile user equipment comprising:

de-mapping logic for de-mapping bits in accordance with a modulation scheme;

ungrouping logic arranged to ungroup groups of the bits to produce an interleaved parity bit sequence and an interleaved systematic bit sequence, the groups of the bits each comprising parity bits and systematic bits, wherein the systematic bits and the parity bits are mapped to physical channels in different ones of a forward direction and a reverse direction;

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.

14. The mobile user equipment of claim 13, wherein the modulation scheme includes bit-pairs, each bit-pair comprising a systematic bit and a parity bit.

15. The mobile user equipment of claim 14, wherein the bit-pairs are modulated by 16QAM modulation.

16. The mobile user equipment of claim 13, wherein the wireless communication system is a Universal Terrestrial Radio Access Time Division Duplex (UTRA TDD) system.

17. The mobile user equipment of claim 16, wherein the bit-pairs are mapped in an odd indexed physical channel in a forward direction and an even indexed physical channel in a reverse direction, and the odd and even indexed physical channels are comprised in a transport channel, and the de-mapping logic de-maps the bit-pairs from the transport channel.

18. The mobile user equipment of claim 13, configured to operate on a High Speed Downlink Shared Channel.

19. The mobile user equipment of claim 18, configured to operate in High Speed Downlink Packet Access.