Communication method and apparatus in a wireless communication system supporting multiple OFDM parameters sets

Patent metadata

Field	Value
Publication number	US-9001918-B2
Application number	US-201213594370-A
Country	US
Kind code	B2
Filing date	Aug 24, 2012
Priority date	Aug 25, 2011
Publication date	Apr 7, 2015
Grant date	Apr 7, 2015

Abstract

A communication apparatus and method in a wireless communication system that support multiple Orthogonal Frequency Division Multiplexing (OFDM) parameter sets. A method includes determining a respective OFDM parameter set for each of multiple Radio Frequency (RF) chains; and processing an OFDM signal in each of the multiple RF chains based on a parameter value defined in the respective OFDM parameter set.

First claim

What is claimed is:

1. A communication method of a Base Station (BS) in a wireless communication system, the communication method comprising:
transmitting, to at least one Mobile Station (MS) from the BS, information of all supported Orthogonal Frequency Division Multiplexing (OFDM) parameter sets in a cell from among a plurality of OFDM parameter sets, using a default OFDM parameter set;
selecting, by the BS, at least one OFDM parameter set for the at least one MS, from among the supported OFDM parameter sets, based on one of a channel state and a mobility of the at least one MS responsive to the default OFDM parameter set communication; and
performing, by the BS, data communication with the at least one MS through the at least one selected OFDM parameter set,
wherein each of the plurality of OFDM parameter sets comprises a different combination of parameter values representing an Inverse Fast Fourier Transform (IFFT) size, a Cyclic Prefix (CP) length, a subcarrier spacing, and a symbol duration, and
wherein the default OFDM parameter set has a greatest subcarrier spacing among the plurality of OFDM parameter sets.

2. The communication method of claim 1 , wherein transmitting the information of the supported OFDM parameter sets further comprises:
broadcasting the information of the supported OFDM parameter sets over a broadcast channel to the at least one MS.

3. The communication method of claim 1 , wherein transmitting the information of the supported OFDM parameter sets further comprises:
transmitting the information of the supported OFDM parameter sets to the at least one MS through basic capability support negotiation during a network entry.

4. The communication method of claim 1 , further comprising:
determining whether a change of an OFDM parameter set is necessary, based on one of the channel state and the mobility of the at least one MS; and
transmitting, to the at least one MS, information of a changed OFDM parameter set.

5. The communication method of claim 1 , further comprising:
receiving an OFDM parameter set change request from the at least one MS;
determining a changed OFDM parameter set to be used by the at least one MS; and
transmitting the changed OFDM parameter set to the at least one MS.

6. The communication method of claim 1 , wherein selecting the at least one OFDM parameter set further comprises:
if the at least one MS includes a plurality of radio frequency (RF) chains, selecting multiple OFDM parameter sets for the at least one MS, each of the multiple OFDM parameter sets corresponding to a respective one of the plurality of RF chains; and
if the at least one MS includes one RF chain, selecting one OFDM parameter set for the at least one MS.

7. A communication method of a Mobile Station (MS) in a wireless communication system, the communication method comprising:
receiving, from a Base Station (BS) at the MS, information of all supported Orthogonal Frequency Division Multiplexing (OFDM) parameter sets in a cell from among a plurality of OFDM parameter sets, using a default OFDM parameter set; and
performing, by the MS, data communication with the BS through at least one OFDM parameter set selected from the supported OFDM parameter sets based on one of a channel state and a mobility of the MS responsive to the default OFDM parameter set communication,
wherein each of the plurality of OFDM parameter sets comprises a different combination of parameter values representing an Inverse Fast Fourier Transform (IFFT) size, a Cyclic Prefix (CP) length, a subcarrier spacing, and a symbol duration, and
wherein the default OFDM parameter set has a greatest subcarrier spacing among the plurality of OFDM parameter sets.

8. The communication method of claim 7 , wherein receiving the information of the supported OFDM parameter sets further comprises:
receiving the information of the supported OFDM parameter sets from the BS over a broadcast channel.

9. The communication method of claim 7 , wherein receiving the information of the supported OFDM parameter sets further comprises:
receiving the information of the supported OFDM parameter sets from the BS through basic capability support negotiation during a network entry.

10. The communication method of claim 7 , further comprising selecting the at least one OFDM parameter set from among the supported OFDM parameter sets,
wherein selecting the at least one OFDM parameter set comprises:
if the MS includes a plurality of radio frequency (RF) chains, selecting multiple OFDM parameter sets from among the supported OFDM parameter sets, each of the multiple OFDM parameter sets corresponding to a respective one of the plurality of RF chains; and
if the MS includes one RF chain, selecting one OFDM parameter set from among the supported OFDM parameter sets.

11. The communication method of claim 7 , further comprising:
receiving, from the BS, information of a changed OFDM parameter set; and
communicating with the BS through the changed OFDM parameter set.

12. The communication method of claim 7 , further comprising:
transmitting an OFDM parameter set change request to the BS;
receiving, from the BS, information of a changed OFDM parameter set; and
communicating with the BS through the changed OFDM parameter set.

13. A communication apparatus of a Base Station (BS) in a wireless communication system, the communication apparatus comprising:
a controller configured to select all supported Orthogonal Frequency Division Multiplexing (OFDM) parameter sets of a cell from among a plurality of OFDM parameter sets communicated via a default OFDM parameter set, and the controller is further configured to subsequently select at least one OFDM parameter set for at least one Mobile Station (MS), from among the supported OFDM parameter sets, based on one of a channel state and a mobility of the at least one MS responsive to the default OFDM parameter set; and
a transceiver configured to transmit, to the at least one MS, information of the supported OFDM parameter sets of the cell, using the default OFDM parameter set, and perform data communication with the at least one MS through the subsequently selected at least one OFDM parameter set,
wherein each of the plurality of OFDM parameter sets comprises a different combination of parameter values representing an Inverse Fast Fourier Transform (IFFT) size, a Cyclic Prefix (CP) length, a subcarrier spacing, and a symbol duration, and
wherein the default OFDM parameter set has a greatest subcarrier spacing among the plurality of OFDM parameter sets.

14. The communication apparatus of claim 13 , wherein the transceiver is further configured to transmit the information of the supported OFDM parameter sets to the at least one MS by broadcasting the information of the supported OFDM parameter sets over a broadcast channel.

15. The communication apparatus of claim 13 , wherein the transceiver is further configured to transmit the information of the supported OFDM parameter sets to the at least one MS by transmitting the information of the supported OFDM parameter sets to the at least one MS through basic capability support negotiation during a network entry.

16. The communication apparatus of claim 13 , wherein the controller is further configured to:
if the at least one MS includes a plurality of radio frequency (RF) chains, select multiple OFDM parameter sets for the at least one MS, each of the multiple OFDM parameter sets corresponding to a respective one of the plurality of RF chains; and
if the at least one MS includes one RF chain, select one OFDM parameter set for the at

Assignees

• Taori Rakesh
• Han Shuangfeng
• Samsung Electronics Co Ltd

Inventors

• Taori Rakesh
• Han Shuangfeng

Classifications

• H04L27/2601

  Multicarrier modulation systems · CPC title

• H04L27/2646 Primary

  using feedback from receiver for adjusting OFDM transmission parameters, e.g. transmission timing or guard interval length · CPC title

• H04W72/04

  Wireless resource allocation · CPC title

• H04L69/24

  Negotiation of communication capabilities · CPC title

• H04L27/2605

  Symbol extensions, e.g. Zero Tail, Unique Word [UW] · CPC title