Transmission and Reception Methods and Associated Communication Devices for Use in OFDM-Based Communication Network

• US 20160119083A1
• Filed: 05/21/2014
• Published: 04/28/2016
• Est. Priority Date: 05/21/2013
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Zhao, Zhenshan, LU, Qianxi, MIAO, Qingyu, SORRENTINO, Stefano
• Granted Patent: US 9,686,043 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H03M 13/2703 the interleaver involving at least two directions
• CPC Class Codes: H03M 13/2957 Turbo codes and decoding
• CPC Class Codes: H03M 13/356 Unequal error protection [UEP]
• CPC Class Codes: H03M 13/6525 3GPP LTE including E-UTRA
• CPC Class Codes: H04L 1/0068 by puncturing
• CPC Class Codes: H04L 1/0071 Use of interleaving interleaving per se H03M13/27
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/0058 Allocation criteria
• CPC Class Codes: H04W 4/70 Services for machine-to-machine communication [M2M] or machine type communication [MTC]

Abstract

The present disclosure provides a terminal device and a method performed in the terminal device for communicating with a radio base station (RBS) or a Device-to-Device (D2D) terminal device. The method comprises forming a radio subframe by including coded bits in the radio subframe. The coded bits contain a sequence of systematic bits and a sequence of redundancy bits, and only redundancy bits are included in a head and a tail of the first and/or the last Orthogonal Frequency Division Multiplexing (OFDM) symbols of the radio subframe. The method further comprises transmitting the radio subframe to the radio base station RBS or the Device-to-Device (D2D) terminal device. The present disclosure also provides a communication device communicating with the proposed terminal device and a method performed in the communication device.

Claims

1. A method performed in a terminal device for communicating with a radio base station (RBS) or a Device-to-Device (D2D) terminal device in an Orthogonal Frequency Division Multiplexing (OFDM) based radio communication network, comprising:

forming a radio subframe by including coded bits in the radio subframe, wherein the coded bits contain a sequence of systematic bits and a sequence of redundancy bits, and only redundancy bits are included in a head and a tail of the first and/or the last OFDM symbols of the radio subframe; and

transmitting the radio subframe to the RBS or the D2D terminal device.

2. The method of claim 1, wherein

if systematic bits are to be included in the first and/or last OFDM symbol, the systematic bits are included in a central portion of the first and/or the last OFDM symbol.

3. The method of claim 1, wherein the redundancy bits included in the head and the tail of the first and/or the last OFDM symbols belong to a subsequence of the sequence of redundancy bits.

4. The method of claim 1, wherein

the coded bits are placed by blocks into an interleaving matrix, with each block of the coded bits corresponding to a modulated symbol, and

the coded bits in each column of the interleaving matrix are included in a respective OFDM symbol of the radio subframe.

5. The method of claim 4, wherein

blocks of redundancy bits at a head portion of the subsequence are placed into blocks of elements at a bottom end portion of the first column of the interleaving matrix and/or a top end portion of the last column of the interleaving matrix, and

blocks of redundancy bits at a tail portion of the subsequence are placed into blocks of elements at a top end portion of the first column of the interleaving matrix and/or a bottom end portion of the last column of the interleaving matrix.

6. The method of claim 4, wherein

if systematic bits are included in a central portion of the first and/or last OFDM symbol,

blocks of redundancy bits at a head portion of the subsequence are placed into blocks of elements in a neighborhood of the central portion of the first column of the interleaving matrix and/or a neighborhood of the central portion of the last column of the interleaving matrix, and

blocks of redundancy bits at a tail portion of the subsequence are placed into elements at both end portions of the first column of the interleaving matrix and/or both end portions of the last column of the interleaving matrix.

7. The method of claim 4, wherein

if there is no systematic bits included in the first and/or last OFDM symbol,

blocks of redundancy bits at a head portion of the subsequence are placed into blocks of elements at the central portion of the first column of the interleaving matrix and/or the central portion of the last column of the interleaving matrix, and

blocks of redundancy bits at a tail portion of the subsequence are placed into blocks of elements at both end portions of the first column of the interleaving matrix and/or both end portions of the last column of the interleaving matrix.

8. The method of claim 5, wherein

any two adjacent blocks of redundancy bits in the subsequence are placed in the first and the last column respectively, if the redundancy bits are placed into elements at both end portions of the first and the last columns.

9. The method of claim 6, wherein

any two adjacent blocks of redundancy bits in the subsequence are placed in the first and the last column respectively or are placed into two spaced apart blocks of elements in one of the first and the last column, if the redundancy bits are placed into elements at both end portions of the first and the last columns.

10. The method of claim 4, wherein

two blocks of redundancy bits separated by k/2−

1 blocks of redundancy bits are placed into two adjacent blocks of elements in the first and/or the last column, wherein k is the number of blocks of redundancy bits in the subsequence.

11. The method of claim 1, wherein the terminal device is a cellular terminal device or a Device-to-Device (D2D) terminal device.

12. (canceled)

13. A method performed in a communication device for communicating with a cellular terminal device or a Device-to-Device (D2D) terminal device in an Orthogonal Frequency Division Multiplexing (OFDM) based radio communication network, comprising:

receiving a radio subframe from the cellular terminal device or the D2D terminal device, wherein the radio subframe carries redundancy bits in a head and a tail of the first and/or the last OFDM symbols of the radio subframe; and

puncturing bits in the radio subframe which correspond to the head and the tail of at least one of the first and the last OFDM symbols, wherein the at least one of the first and the last OFDM symbols is subject to interference.

14. The method of claim 13, further comprising:

demodulating the radio subframe to obtain a sequence of demodulated bits, wherein said puncturing is performed on some of the demodulated bits which correspond to the head and the tail of the at least one of the first and the last OFDM symbols.

15. The method of claim 13, further comprising:

determining which of the first and the last OFDM symbols of the radio subframe is/are subject to interference.

16. The method of claim 15, wherein:

the determining comprises determining a length of an interfered part of the interfered OFDM symbol(s), and

the puncturing comprises puncturing bits in the radio subframe which correspond to the interfered part of the interfered OFDM symbol(s).

17. The method of claim 13, further comprising:

calculating an amount of interference leaking to all bits in the radio subframe which correspond to the interfered OFDM symbol(s), the interference being caused by a windowing operation performed in frequency domain for selecting resource blocks allocated to the cellular terminal device or the D2D terminal device, and

based on the calculated amount of interference, suppressing the interference leaking to all the bits corresponding to the interfered OFDM symbol(s).

18. The method of claim 13, wherein the communication device is a Radio Base Station (RBS) or a D2D terminal device.

19. (canceled)

20. A terminal device, in an Orthogonal Frequency Division Multiplexing (OFDM) based radio communication network, comprising:

a subframe former configured to form a radio subframe by including coded bits in the radio subframe, wherein the coded bits contain a sequence of systematic bits and a sequence of redundancy bits, and only redundancy bits are included in a head and a tail of the first and/or the last OFDM symbols of the radio subframe; and

a transceiver configured to transmit the radio subframe to a radio base station (RBS) or a Device-to-Device (D2D) terminal device.

21. The terminal device of claim 20, wherein

if systematic bits are to be included in the first and/or last OFDM symbol, the subframe former is configured to include systematic bits in a central portion of the first and/or the last OFDM symbol.

22. The terminal device of claim 20, wherein the redundancy bits included in the head and the tail of the first and/or the last OFDM symbols belong to a subsequence of the sequence of redundancy bits.

23. The terminal device of claim 20, wherein the subframe former is further configured to

place the coded bits by blocks into an interleaving matrix, with each block of the coded bits corresponding to a modulated symbol, and

include the coded bits in each column of the interleaving matrix in a respective OFDM symbol of the radio subframe.

24. The terminal device of claim 23, wherein the subframe former is further configured to

place blocks of redundancy bits at a head portion of the subsequence into blocks of elements at a bottom end portion of the first column of the interleaving matrix and/or a top end portion of the last column of the interleaving matrix, and

place blocks of redundancy bits at a tail portion of the subsequence into blocks of elements at a top end portion of the first column of the interleaving matrix and/or a bottom end portion of the last column of the interleaving matrix.

25. The terminal device of claim 23, wherein if systematic bits are included in a central portion of the first and/or last OFDM symbol, the subframe former is further configured to

place blocks of redundancy bits at a head portion of the subsequence into blocks of elements in a neighborhood of the central portion of the first column of the interleaving matrix and/or a neighborhood of the central portion of the last column of the interleaving matrix, and

place blocks of redundancy bits at a tail portion of the subsequence into elements at both end portions of the first column of the interleaving matrix and/or both end portions of the last column of the interleaving matrix.

26. The terminal device of claim 23, wherein if there is no systematic bits included in the first and/or last OFDM symbol, the subframe former is further configured to

place blocks of redundancy bits at a head portion of the subsequence into blocks of elements at the central portion of the first column of the interleaving matrix and/or the central portion of the last column of the interleaving matrix, and

place blocks of redundancy bits at a tail portion of the subsequence into blocks of elements at both end portions of the first column of the interleaving matrix and/or both end portions of the last column of the interleaving matrix.

27. The terminal device of claim 24, wherein the subframe former is further configured to

place any two adjacent blocks of redundancy bits in the subsequence in the first and the last column respectively, if the redundancy bits are placed into elements at both end portions of the first and the last columns.

28. The terminal device of claim 25, wherein the subframe former is further configured to

place any two adjacent blocks of redundancy bits in the subsequence in the first and the last column respectively or into two spaced apart blocks of elements in one of the first and the last column, if the redundancy bits are placed into elements at both end portions of the first and the last columns.

29. The terminal device of claim 23, wherein the subframe former is further configured to

place two blocks of redundancy bits separated by k/2−

1 blocks of redundancy bits into two adjacent blocks of elements in the first and/or the last column, wherein k is the number of blocks of redundancy bits in the subsequence.

30. The terminal device of claim 20, wherein the terminal device is a cellular terminal device or a Device-to-Device (D2D) terminal device.

31. (canceled)

32. A communication device in an Orthogonal Frequency Division Multiplexing (OFDM) based radio communication network, comprising:

a transceiver configured to receive a radio subframe from a cellular terminal device or a Device-to-Device (D2D) terminal device, wherein the radio subframe carries redundancy bits in a head and a tail of the first and/or the last OFDM symbols of the radio subframe; and

a puncturing component configured to puncture bits in the radio subframe which correspond to the head and the tail of at least one of the first and the last OFDM symbols, wherein the at least one of the first and the last OFDM symbols is subject to interference.

33. The communication device of claim 32, further comprising:

a demodulator configured to demodulate the radio subframe to obtain a sequence of demodulated bits, wherein said puncturing is performed on some of the demodulated bits which correspond to the head and the tail of the at least one of the first and the last OFDM symbols.

34. The communication device of claim 32, further comprising:

an interfered symbol determination component configured to determine which of the first and the last OFDM symbols of the radio subframe is/are subject to interference.

35. The communication device of claim 34, wherein

the interfered symbol determination component is further configured to determine a length of an interfered part of the interfered OFDM symbol(s), and

the puncturing component is further configured to puncture bits in the subframe which correspond to the interfered part of the interfered OFDM symbol(s).

36. The communication device of claim 32, further comprising:

an interference calculator configured to calculate an amount of interference leaking to all bits in the radio subframe which correspond to the interfered OFDM symbol(s), the interference being caused by a windowing operation performed in frequency domain for selecting resource blocks allocated to the cellular terminal device or the D2D terminal device, and

an interference suppressor configured to, based on the calculated amount of interference, suppress the interference leaking to all the bits corresponding to the interfered OFDM symbol(s).

37. The communication device of claim 32, wherein the communication device is a Radio Base Station (RBS) or a Device-to-Device (D2D) terminal device.

38-42. -42. (canceled)