METHODS FOR BANDWIDTH EFFICIENT OPERATIONS IN WIRELESS LOCAL AREA NETWORKS

• US 20150373587A1
• Filed: 05/01/2015
• Published: 12/24/2015
• Est. Priority Date: 06/19/2014
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Taori, Rakesh, Josiam, Kaushik M.
• Granted Patent: US 9,681,335 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0028 Variable division signaling therefor H04L5/0092
• CPC Class Codes: H04L 5/0041 Frequency-non-contiguous
• CPC Class Codes: H04L 5/0064 Rate requirement of the data, e.g. scalable bandwidth, data priority
• CPC Class Codes: H04L 5/0092 Indication of how the channel is divided
• CPC Class Codes: H04W 28/20 Negotiating bandwidth
• CPC Class Codes: H04W 48/12 using downlink control channel
• CPC Class Codes: H04W 74/002 Transmission of channel access control information
• CPC Class Codes: H04W 74/0816 with collision avoidance
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

A method of establishing a data transmission bandwidth between a transmitting node and a receiving node is provided. The method includes sending a request to send (RTS) message from a transmitting node to a receiving node, the RTS message indicating a data transmission bandwidth to be considered for use in subsequent data transmission and establishing a negotiated data transmission bandwidth comprising multiple channels, wherein each channel comprises a 20 MHz bandwidth, and wherein the multiple channels are at least one of contiguous and non-contiguous in frequency.

Claims

1. An apparatus capable of establishing a data transmission bandwidth between a transmitting node and a receiving node, the apparatus comprising:

one or more antenna configured to communicate data; and

processing circuitry configured to;

sense one or more free channels within a data transmission bandwidth comprising multiple channels;

establish a negotiated data transmission bandwidth using at least one of the one or more free channels irrespective of continuity of frequency of the one or more free channels.

2. The apparatus of claim 1, wherein the processing circuitry is configured to negotiate the data transmission bandwidth by sending a request to send (RTS) message to a receiving node, the RTS message indicating the data transmission bandwidth to be considered for use in subsequent data transmission.

3. The apparatus of claim 2, wherein the indicating the data transmission bandwidth comprises utilizing a subset of a seven bit scrambling sequence initialization, wherein the subset is configured to indicate at least one of:

a size of the data bandwidth or a location of the free channels.

4. The apparatus of claim 3, wherein at least one of:

the first three bits of the scrambling sequence initialization comprise a two bit indicator adapted to indicate one of four different bandwidth choices and a one bit indicator adapted to indicate whether the indicated bandwidth is fixed for a static mode or a variable for a dynamic mode;

the last four bits of the scrambling sequence initialization are adapted to indicate a subset of the bandwidth indicated in the said two bit indicator, and wherein

all seven bits of the scrambling sequence initialization are used as a bitmap to indicate which seven 20 MHz segments are to be used, and wherein

all 20 MHz segments refer to channels other than a primary 20 MHz channel;

wherein the RTS is duplicated on the channels indicated by the two bit indicator;

or

the RTS is duplicated only on the channels selected for a data transmission.

5. The apparatus of claim 2, wherein the processing circuitry is configured to, in response to sending the RTS message, receive a clear to send (CTS) message from the receiving node, the CTS message configured to indicate the channel bandwidth considered for use in data transmission.

6. The apparatus of claim 5, wherein at least one of:

a bandwidth indicator of the CTS message indicates a smaller channel bandwidth than the bandwidth indicated by the RTS message;

a bandwidth indicator transmitted indicates a subset of the bands indicated by the RTS message;

a bit bitmap associated with the CTS message indicates 20 MHz segments other than a primary 20 MHz channel;

or

the CTS message is duplicated only on the channels selected for data transmission.

7. The apparatus of claim 6, wherein the processing circuitry is configured to, in response to sending the RTS message, after receiving the CTS message, begin data transmission on the channels indicated in the CTS message.

8. An apparatus comprising:

one or more antenna configured to communicate data; and

processing circuitry configured to;

indicate an aggregation level to all nodes capable of transmitting and receiving data, and

at least one of;

use the aggregation level to indicate a minimum bandwidth segment that should be individually indicated when negotiating a channel bandwidth;

or indicate the aggregation level along with positions of secondary channels relative to a primary channel.

9. The apparatus of claim 8, wherein the processing circuitry is configured to transmit, via the one or more antenna, a request to send (RTS) message, the RTS message comprising the aggregation level set by the processing circuitry to indicate a portion of data transmission bandwidth comprising multiple channels is clear and available to be used for transmission.

10. The apparatus of claim 8, wherein, when the aggregation level is set at 20 MHz, at least one field in the RTS includes a first bitmap, the first bitmap comprising an M=[X/20] bit bitmap is used to indicate availability of the channels in 20 MHz increments.

11. The apparatus of claim 8, wherein, in response to transmitting the RTS, the processing circuitry receives a clear to send (CTS) message, the CTS message comprising a second bitmap configured to indicate a subset of the bandwidths indicated by the RTS that are available to be used for the transmission when dynamic bandwidth selection is allowed.

12. The apparatus of claim 11, wherein at least one of:

a bandwidth indicator of the CTS message indicates a smaller channel bandwidth than the bandwidth indicated by the RTS message;

a bandwidth indicator transmitted indicates a subset of the bands indicated by the RTS message;

a bit bitmap associated with the CTS message indicates 20 MHz segments other than a primary 20 MHz channel;

or

the CTS message is duplicated only on the channels selected for data transmission.

13. The apparatus of claim 11, wherein the processing circuitry is configured to, in response to sending the RTS message, after receiving the CTS message, begin data transmission on the channels indicated in the CTS message.

14. The apparatus of claim 11, wherein relative positions of a secondary channel with respect to a primary channel are set based on one of:

a convention other conventions with different levels of channel aggregation, and

15. The apparatus of claim 14, wherein the processing circuitry is configured to at least one of:

transmit, via the one or more antenna, a beacon comprising an advertisement of relative positions of the secondary channel with respect to the primary channel and the aggregation level, allowing for more dynamic configuration of the secondary channels with respect to the primary channels;

modify the aggregation level in each advertisement;

or

indicate when 40 MHz channels are treated as a single channel or are signaled separately as individual 20 MHz channels.

16. An apparatus comprising:

one or more antenna configured to communicate data; and

processing circuitry configured to;

in response to completing a negotiation for a data transmission bandwidth comprising a plurality of channels, select a subset of one or more channels sensed as free within the data transmission bandwidth, and

apply a transmission mask configured to enable transmission on of the data on the selected subset and not transmit data on a portion of the one or more channels sensed as free that is not within the subset.

17. The apparatus of claim 16, wherein the processing circuitry is configured to apply the transmission mask by nulling the data transmission on at least one sub-carrier.

18. The apparatus of claim 16, wherein the processing circuitry is configured to apply the transmission mask by transmitting portions of the data over different antenna.

19. The apparatus of claim 18, wherein the processing circuitry is configured to transmit a first portion of the data over a first antenna and a second portion of the data is transmitted over a second antenna.

20. The apparatus of claim 16, wherein the processing circuitry is configured to transmit the data after a transmission of a clear to send (CTS) message, the CTS message configured to indicate the channel bandwidth considered for use in data transmission and transmitted in response to receiving a request to send (RTS) message, the RTS message indicating the data transmission bandwidth to be considered for use in subsequent data transmission.