METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING INFORMATION IN WIRELESS DISTRIBUTED SYSTEM

• US 20160128044A9
• Filed: 05/06/2015
• Published: 05/05/2016
• Est. Priority Date: 05/02/2014
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: CHANG, Kapseok, KWAK, Byung-Jae
• Granted Patent: US 9,974,056 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 67/104 Peer-to-peer [P2P] networks
• CPC Class Codes: H04W 28/0215 based on user or device properties, e.g. MTC-capable devices services for machine-to-machine communication [M2M] or machine type communication [MTC] H04W4/70; wireless resource selection or allocation plan definition based on terminal or device properties H04W72/51
• CPC Class Codes: H04W 4/70 Services for machine-to-machine communication [M2M] or machine type communication [MTC]
• CPC Class Codes: H04W 4/80 Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
• CPC Class Codes: H04W 56/00 Synchronisation arrangements
• CPC Class Codes: H04W 56/001 Synchronization between nodes
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

When a transmitter transmits a first Timing Offset Indication iDentifier (TOID) of a plurality of TOIDs representing timing offset of a frame, the transmitter determines a first codeword corresponding to the first TOID of a plurality of codewords representing a subcarrier. The transmitter allocates a busy tone to a first subcarrier that the first codeword represents. The transmitter transmits the busy tone.

Claims

1. A transmitting method of a transmitter, the transmitting method comprising:

determining, when transmitting a first Timing Offset Indication iDentifier (TOID) of a plurality of TOIDs representing timing offset of a frame, a first codeword corresponding to the first TOID among a plurality of codewords representing a subcarrier;

allocating a busy tone to a first subcarrier that the first codeword represents; and

transmitting the busy tone.

2. The transmitting method of claim 1, further comprising transmitting a preamble, which is a timing reference signal in order to provide synchronization of the frame in a network in which an infrastructure does not exist,

wherein the transmitter is a terminal that is different from an Access Point (AP).

3. The transmitting method of claim 1, wherein the number of first subcarriers that the first codeword represents is one, and

the transmitting of the busy tone comprises allocating the entire or a portion of maximum power for one time domain symbol to the busy tone.

4. The transmitting method of claim 1, wherein the allocating of a busy tone comprises allocating the busy tone to the N (N is a natural number of 2 or more) number of first subcarriers that the N number of elements that are included in the first codeword represent,

the M (M is a natural number of 2 or more) number of subcarriers are formed into the N number of subcarrier groups, and

the N number of first subcarriers belong to the N number of subcarrier groups, respectively.

5. The transmitting method of claim 4, wherein a Hamming distance between the first codeword and the remaining codewords of the plurality of codewords is 2 or more.

6. The transmitting method of claim 5, wherein the transmitting of the busy tone comprises allocating 1/N of maximum power for one time domain symbol to each of busy tones that are allocated to the N number of first subcarriers.

7. The transmitting method of claim 4, wherein at least one of the N number of subcarrier groups corresponds to a first time domain symbol, and at least one thereof corresponds to a second time domain symbol.

8. The transmitting method of claim 2, wherein a synchronization slot that is included in the frame comprises:

a nulling segment that is located before the preamble and that reduces signal collision;

the preamble;

a Timing Offset Indication Field (TOIF) that is located after the preamble and that provides timing offset of the frame; and

a Contention-Window Indication Field (CWIF) that is located after the preamble and that provides a size of a contention window.

9. A transmitting method of a transmitter, comprising:

determining, when transmitting a first Contention Window Indication iDentifier (CWID) of a plurality of CWIDs representing a size of a contention window, a first codeword corresponding to the first CWID of a plurality of codewords representing a subcarrier;

allocating a busy tone to a first subcarrier that the first codeword represents; and

transmitting the busy tone.

10. The transmitting method of claim 9, wherein the allocating of a busy tone comprises allocating the busy tone to the N (N is a natural number) number of first subcarriers that the N number of elements that are included in the first codeword represent,

the M (M is a natural number of 2 or more) number of subcarriers are grouped into the N number of subcarrier groups, and

the N number of first subcarriers belong to the N number of subcarrier groups, respectively.

11. The transmitting method of claim 10, further comprising transmitting a preamble, which is a timing reference signal in order to provide synchronization of the frame in a network in which an infrastructure does not exist,

wherein the transmitter is a terminal instead of an Access Point (AP), and

a Hamming distance between the first codeword and the remaining codewords of the plurality of codewords is 2 or more, when the N is 2 or more.

12. The transmitting method of claim 11, wherein the transmitting of the busy tone comprises allocating 1/N of maximum power for one time domain symbol to each of the busy tones that are allocated to the N number of first subcarriers, when the N is 2 or more.

13. A transmitting method of a transmitter, the transmitting method comprising:

determining, when transmitting first information having a first value, a first sequence corresponding to the first value of a plurality of sequences representing a value of the first information;

allocating the first sequence to a plurality of feasible subcarriers; and

allocating power to the plurality of subcarriers.

14. The transmitting method of claim 13, further comprising transmitting a preamble, which is a timing reference signal in order to form synchronization of a frame in a network in which an infrastructure does not exist,

wherein the transmitter is a terminal instead of an Access Point (AP), and

the first information is one of timing offset information of the frame, contention window size information of the transmitter, and collision detection information.

15. The transmitting method of claim 14, wherein the allocating of power to the plurality of subcarriers comprises:

dividing maximum power for one time domain symbol by the number of the plurality of subcarriers; and

allocating the divided power to each of the plurality of subcarriers.

16. The transmitting method of claim 15, wherein the allocating of the first sequence to a plurality of subcarriers comprises allocating, when the first sequence is one, each element of the first sequence having a length corresponding to the number of the plurality of subcarriers to each of the plurality of subcarriers.

17. The transmitting method of claim 15, wherein the determining of a first sequence comprises:

determining a first codeword corresponding to the first value among a plurality of codewords; and

determining the N (N is a natural number of 2 or more) number of first sequences corresponding to the first codeword among the plurality of sequences,

wherein the allocating of the first sequence to a plurality of feasible subcarriers comprises allocating, when the plurality of feasible subcarriers are the M number (M is a natural number of 2 or more), each element belonging to each of the first sequences having a length of M/N to each of the M number of subcarriers.

18. The transmitting method of claim 17, wherein the allocating of each element comprises allocating, when N is 2, one of the two first sequences to odd-numbered subcarriers of the M number of subcarriers and allocating the remaining one of the two first sequences to even-numbered subcarriers of the M number of subcarriers.

19. The transmitting method of claim 17, wherein the allocating of each element comprises allocating, when N is 4, a second sequence of the four first sequences to a first subcarrier group among the M number of subcarriers, allocating a third sequence of the four first sequences to a second subcarrier group of the M number of subcarriers, allocating a fourth sequence of the four first sequences to a third subcarrier group of the M number of subcarriers, and allocating a fifth sequence of the four first sequences to a fourth subcarrier group of the M number of subcarriers.

20. The transmitting method of claim 19, wherein the third sequence is adjusted based on the second sequence, and

the fifth sequence is adjusted based on the fourth sequence.