Stack signaling to application with lack of requested bandwidth

• US 8,189,621 B2
• Filed: 05/12/2006
• Issued: 05/29/2012
• Est. Priority Date: 05/12/2006
• Status: Expired due to Fees

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Corporation
• Inventors: Hassan, Amer A., Kuehnel, Thomas W., Wu, Deyun, Huitema, Christian, Frost, D. Gabriel
• Primary Examiner(s): Lee, Jae Y
• Application Number:
  US11/433,804
• Publication Number:
  US 20070263653A1
• Time in Patent Office: 2,209 Days
• Field of Search: 370/329, 370/343, 370/344, 370/461, 370/480
• US Class Current: 370/480
• CPC Class Codes: H03M 1/12 Analogue/digital converters H03M1/001 – H03M1/10 take precedence
• CPC Class Codes: H03M 9/00 Parallel/series conversion or vice versa digital stores in which the information is moved stepwise per se G11C19/00
• CPC Class Codes: H04L 27/18 Phase-modulated carrier systems, i.e. using phase-shift keying H04L27/32 takes precedence
• CPC Class Codes: H04L 27/2605 Symbol extensions, e.g. Zero Tail, Unique Word [UW]
• CPC Class Codes: H04L 27/2607 Cyclic extensions
• CPC Class Codes: H04L 27/34 Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling
• CPC Class Codes: H04L 5/0064 Rate requirement of the data, e.g. scalable bandwidth, data priority
• CPC Class Codes: H04L 5/1446 of transmission speed
• CPC Class Codes: H04L 65/61 for supporting one-way streaming services, e.g. Internet radio
• CPC Class Codes: H04L 65/80 Responding to QoS
• CPC Class Codes: H04W 28/0268 using specific QoS parameters for wireless networks, e.g. QoS class identifier [QCI] or guaranteed bit rate [GBR] negotiating SLA or negotiating QoS H04W28/24
• CPC Class Codes: H04W 28/24 Negotiating SLA [Service Level Agreement]; Negotiating QoS [Quality of Service]

Abstract

A system for signaling an application when a requested data rate and Quality of Service cannot be achieved using OFDM wireless data transmission, and the application proceeds by either renegotiating QoS and data rate, or waiting until they requested rate and QoS are met.

Claims

1. A method of operating a computer to initiate a communication at a performance level requested by an application executing on the computer in conjunction with an operating system of the computer, the application generating data for transmission, the method comprising:

operating the computer to perform the acts of;

a) receiving in a first component of the computer separate from the application a request from the application of the computer to initiate the communication at the performance level;

b) within the first component, mapping the requested performance level to a set of communications parameters, wherein the mapping comprises determining a noise level and a required number of subchannels that is required to meet the requested performance level;

c) within a second component of the computer, detecting an energy level on subchannels of the plurality of subchannels;

d) within a third component of the computer, determining whether a number of subchannels having an energy level below the noise level that are available is less than the required number of subchannels;

e) when the number of subchannels having the energy level below the noise level is less than the required number of subchannels, by the computer;

i) sending a signal to the application; and

ii) in response to the signal, increasing, by the application, compression used to generate the data; and

f) when the number of subchannels having the energy level below the noise level is not less than the required number of subchannels, communicating, by the computer, the data from the application using a set of subchannels of the plurality of subchannels, the set containing a number of subchannels selected based on the required number of subchannels, the number of subchannels contained in the set being less than the number of subchannels having the energy level below the noise level.

2. The method of claim 1, wherein the communication is wireless.

3. The method of claim 1, wherein the communication occurs over wires.

4. The method of claim 1, wherein the performance level consists of a data rate and a Quality of Service (QoS).

5. The method of claim 4, further comprising the act of selecting a lower data rate and repeating acts (a), (b), (c) and (d) prior to sending the signal in act (e) if the communication parameters are not available.

6. The method of claim 1, wherein the mapping comprises selecting subchannels from the plurality of subchannels.

7. The method of claim 1, wherein the communications parameters include a power level of transmission.

8. The method of claim 1, wherein the mapping in act (b) minimizes the required number of subchannels that is required to meet the requested performance level.

9. A wireless transmission system for transmitting data in response to a request from an application to transmit at a data rate and Quality of Service (QoS), the wireless transmission system comprising:

a computer having a network interface, the computer comprising;

an operating system comprising a protocol stack coupling the application executed by the computer to the network interface, the protocol stack having a generic quality of service interface through which the application requests the data rate and the Quality of Service(QoS);

a subchannel/energy mapping module that determines a required number of subchannels from a plurality of subchannels and an energy threshold needed to meet the requested data rate and Quality of Service (QoS);

a noise detection module that detects an energy level on each available subchannel;

a signaling module that determines whether a number of subchannels having an energy level below a noise level is less than the required number of subchannels,

wherein the signaling module signals the application that the requested data rate and Quality of Service (QoS) are not available when it is determined that the number of subchannels from the plurality of subchannels having the energy level below the noise level is less than the required number of subchannels,

wherein the application is coupled to the signaling module through the protocol stack to receive a signal from the signaling module through the generic quality of service interface when the requested data rate and Quality of Service (QoS) are not available,

wherein the subchannel/energy mapping module and the signaling module are within the operating system.

10. The system of claim 9, wherein the application is a Voice-over-IP client, a streaming multimedia application, an Internet web browser, or an instant messenger client.

11. The system of claim 9, wherein:

the signaling module also signals the subchannel/energy mapping module when the requested data rate and Quality of Service (QoS) are not available; and

the subchannel/energy mapping module responds to a signal from the signaling module that the requested data rate and Quality of Service (QoS) are not available by selecting a higher noise level.

12. The system of claim 9, wherein the subchannel/energy mapping module also determines a power level for transmission.

13. The system of claim 9, wherein the application comprises a streaming multimedia application executing on the computer and the application increases the compression of a stream when the requested data rate and Quality of Service (QoS) are not available.

14. A computer storage device having stored thereon computer-readable instructions that, as a result of being executed by a computer having an operating system comprising a protocol stack, instruct the computer to perform a method of wireless communication, the method comprising:

a) receiving from a transmitting application executed by the computer a request for a data rate and Quality of Service (QoS) required to send data to a receiving application;

b) within the operating system of the computer, detecting an energy level on each of a plurality of subchannels;

c) within the operating system of the computer, attempting to select a number of subchannels from a plurality of subchannels having the energy level on the subchannels below a noise level that are available to meet the requested data rate and Quality of Service (QoS);

d) within the operating system of the computer, determining whether the number of subchannels having an energy level below the noise level that are available is sufficient to meet the requested data rate and Quality of Service (QoS);

e) when the number of subchannels having the energy level below the noise level is not sufficient to meet the requested data rate and Quality of Service (QoS), by the computer;

signaling to the transmitting application through the protocol stack that the number of subchannels having the energy level below the noise level is insufficient to achieve the requested data rate and Quality of Service (QoS);

signaling, by the transmitting application, to the receiving application to indicate that the requested Quality of Service (QoS) is not available; and

receiving from the receiving application, at the transmitting application, an indication that the receiving application accommodates a lower Quality of Service (QoS) to receive the data; and

communicating, from the transmitting application, with the receiving application using the lower Quality of Service (QoS);

f) when the number of subchannels having the energy level below the noise level is sufficient to meet the requested data rate and Quality of Service (QoS), by the computer;

communicating, from the transmitting application, with the receiving application using the Quality of Service (QoS) using a set containing a number of subchannels, the number of subchannels of the set being less than the number of subchannels having the energy level below the noise level, that is determined to be sufficient to meet the requested data rate and Quality of Service (QoS).

15. The computer storage device of claim 14, wherein the method further comprises selecting a power level for transmission.

16. The computer storage device of claim 15, wherein the selected power level is a minimum possible power level to successfully transmit at the requested data rate and Quality of Service (QoS).

17. The computer storage device of claim 14, wherein the selection of the number of subchannels below the noise level is done using feedback from a receiver.