SIMULTANEOUS SENSING AND DATA TRANSMISSION

• US 20080165754A1
• Filed: 12/28/2007
• Published: 07/10/2008
• Est. Priority Date: 01/09/2007
• Status: Active Grant

• Current Assignee: STMicroelectronics International N.V. (STMicroelectronics NV)
• Original Assignee: STMicroelectronics Incorporated (STMicroelectronics NV)
• Inventors: Hu, Wendong
• Granted Patent: US 8,687,563 B2
• Time in Patent Office: Days
• US Class Current: 370/342
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 72/541 using the level of interference
• CPC Class Codes: H04W 72/542 using measured or perceived quality

Abstract

In order to satisfy the conflicting requirements for spectrum sensing and QoS of data transmission, it is highly desirable for a cognitive radio system, e.g. IEEE 802.22 WRAN, to perform spectrum sensing and data transmission simultaneously. Embodiments of the invention address critical issues of self-interference generated from a transmission unit to the co-located sensing unit when the simultaneous sensing and data transmission technique is applied. A number of interference mitigation techniques are described and analyses are given.

Claims

1. A method for use in wireless regional area network (WRAN) systems, comprising:

providing a WRAN cell operated by a base station to wirelessly communicate with at least one consumer premise equipment;

operating the base station to determine a channel available for use;

initializing the channel to provide an in-band channel for data transmission; and

simultaneously performing spectrum management and spectrum sensing on a plurality of out-of-band channels and data transmission on the in-band channel.

2. The method of claim 1, wherein the spectrum management comprises treating out-of-band channel conditions.

3. The method of claim 1, wherein the spectrum sensing comprises at least one of match filtering, energy detection, and cyclostationary feature detection.

4. The method of claim 1, further comprising interference mitigation techniques on the base station and consumer premise equipment.

5. The method of claim 4, wherein the interference mitigation techniques include at least one of an out-of-band emission mask, a transmission power control of the transmitter, an output filter of the transmitter, an input filter of a sensing receiver, an antenna side lobe suppression, an antenna polarization, an adaptive antenna, and optimization of antenna positioning.

6. A method for use in wireless regional area network (WRAN) systems, comprising:

providing a WRAN cell operated by a base station to wirelessly communicate with at least one consumer premise equipment;

operating the base station to determine a channel available for use;

initializing the channel to provide an in-band channel for data transmission; and

simultaneously performing spectrum management, spectrum sensing on a plurality of out-of-band channels, and data transmission on the in-band channel, wherein the simultaneous performance of spectrum management, spectrum sensing on a plurality of out-of-band channels, and data transmission is capable of operating at an interference below about −

116 dBm with interference mitigation techniques.

7. The method of claim 6, wherein the interference mitigation techniques include at least one of an out-of-band emission mask, a transmission power control of the transmitter, an output filter of the transmitter, an input filter of a sensing receiver, an antenna side lobe suppression, an antenna polarization, an adaptive antenna, and optimization of antenna positioning.

8. A system for simultaneous data transmission, spectrum sensing, and spectrum management, comprising:

a base station; and

at least one user transceiver coupled to the base station by a radio air interface, wherein the base station and at least one user transceiver include interference mitigation techniques and wherein the system is capable of operating at an interference below about −

116 dBm during the simultaneous data transmission, spectrum sensing, and spectrum management.

9. The system of claim 8, wherein the interference mitigation techniques include at least one of an out-of-band emission mask, a transmission power control of the transmitter, an output filter of the transmitter, an input filter of a sensing receiver, an antenna side lobe suppression, an antenna polarization, an adaptive antenna, and optimization of antenna positioning.