Arrangements for beam refinement in a wireless network
View Patent ↗A beamforming method is disclosed that includes performing sequential beam transmissions in multiple directions and receiving replies to the transmissions (i.e. a sector search). The received transmissions can include information or channel parameters such as direction of arrival, signal to noise ratio, signal strength, etc., for each sector. Utilizing the parameters transmitted or fed back by the receiver, the transmitter can store control vectors that dictate a beam that can be utilized to commence a beam refinement procedure. In addition, the parameters can be utilized to select and implement a custom sequence to refine the communication channel between the device and the controller. The custom sequence can significantly reduce the time required to create a channel with acceptable qualities such that efficient high speed network communications can be conducted. Other embodiments are also disclosed.
1. A beam forming method comprising:
performing, by a first station, a sector sweep to determine location relationships between a device and a controller followed by a beam refinement process wherein the sector sweep includes sequential omni-directional transmissions;
receiving, by the first station, at least one reply to the sequential Omni-directional transmissions;
acquiring, by the first station, at least one channel parameter based on the sequential omni-directional transmissions; and
selecting, by the first station, a beam training sequence based on an acquired at least one channel parameter, wherein selecting the beam training sequence based on an acquired at least one channel parameter comprises selecting the beam training sequence with a length based on a quality of a channel.
2. The method of claim 1 , wherein:
the method further comprises comparing the at least one acquired channel parameter to a predetermined metric; and
the selecting is performed based on results of the comparing.
3. The method of claim 1 , further comprising acquiring additional parameters and selecting a different beam training sequence based on the additional parameters.
4. The method of claim 1 , wherein the at least one channel parameter relates to a signal to noise ratio or a signal to interference plus noise ratio.
5. The method of claim 1 , wherein the at least one channel parameter relates to channel gain.
6. The method of claim 1 , wherein the at least one channel parameter relates to a calibration of an antenna array.
7. The method of claim 1 , further comprising performing channel estimation to determine a signal to noise ratio or a signal to interference plus noise ratio.
8. The method of claim 1 , wherein the training sequence comprises transmitting a series of symbols.
9. The method of claim 8 , wherein the series of symbols comprise a PN sequence.
10. The method of claim 1 , comprising performing sequential omni-directional transmissions until a signal to noise ratio (SNR) parameter or a signal to interference plus noise ratio (SINR) parameter has a positive value.
11. The method of claim 1 , wherein the sequential omni-directional transmissions are performed utilizing frequencies above the 50 GHz range.
12. A system comprising:
a configuration module of a first station to control a beam forming process, wherein the beam forming includes a sector sweep followed by a beam refinement process;
a beam controller of the first station to adjust a beam during the beam forming process;
a sensor of the first station to sense at least one channel parameter during the beam forming process; and
a compare module of the first station to compare the at least one channel parameter to a predetermined parameter to determine whether quality communication parameters exist in a channel and produce an output in response to the comparison, the configuration module to provide a beam training sequence in response to the output, wherein the configuration module is configured to select the beam training sequence with a length based on whether quality communication parameters exist in the channel.
13. The system of claim 12 , further comprising a transceiver and an antenna array coupled to the beam controller.
14. The system of claim 12 , wherein the sensor is a signal to noise sensor or a signal to interference plus noise sensor.
15. The system of claim 12 , wherein the beam forming process comprises sending and receiving symbols.
16. A computer including a computer readable storage medium and a processor, wherein the computer readable storage medium is not a transitory signal, the computer readable storage medium including instructions that, when executed by the processor cause the computer to:
perform a beam forming process, comprising a sector sweep followed by a beam refinement process, the sector sweep further including:
performing sequential beam transmissions in more than one direction;
receiving at least one reply to the sequential beam transmissions; and
acquiring at least one channel parameter based on the sequential beam transmissions; and
adjust a beam training sequence based on the acquired at least one channel parameter, wherein adjustment of the beam training sequence comprises determination of the beam training sequence with a length based upon a quality of a channel.
17. The computer of claim 16 that, when the instructions are executed by the processor, cause the computer to compare the at least one acquired channel parameter to a predetermined metric and to adjust the beam training sequence in response to the comparison.
18. The computer of claim 16 that, when the instructions are executed by the processor, cause the computer to adjust the beam training sequence by performing a specific variable training sequence.
19. The computer of claim 16 that, when the instructions are executed by the processor, cause the computer to acquire one of a signal to noise ratio or signal to interference plus noise ratio, beam forming gain, or the presence of a calibrated antenna array.
20. The computer of claim 16 that, when the instructions are executed by the processor, cause the computer to estimate a signal to noise ratio.