Wireless device, beam recovery method and wireless system

1. A wireless device, comprising:

a transceiving circuit, configured to receive a plurality of beam performance parameters corresponding to a plurality of beams, wherein the plurality of beam performance parameters is generated by a user device;

a storage circuit, configured to store a table, wherein the table stores a relationship between the plurality of beams and the plurality of beam performance parameters; and

a processing circuit, configured to perform the following steps:

selecting a first beam according to the table, wherein the wireless device utilizes the first beam to perform data transmission;

determining whether a first beam performance value corresponding to the first beam is less than a threshold value, wherein the first beam performance value is related to at least a first beam performance parameter corresponding to the first beam; and

selecting a second beam according to the table when the first beam performance value is less than the threshold value, wherein the wireless device switches to the second beam to perform data transmission;

wherein the processing circuit further performs the following steps:

determining whether the first beam performance value corresponding to the first beam is greater than the threshold value when the wireless device utilizes the second beam to perform data transmission; and

re-selecting the first beam when the first beam performance value is greater than the threshold value, wherein the wireless device switches to the first beam to perform data transmission.

2. The wireless device of claim 1 , wherein the processing circuit performs the following steps, to select the first beam according to the table:

obtaining a plurality of beam performance indices corresponding to the plurality of beams according to the plurality of beam performance parameters;

performing a sorting operation on the plurality of beam performance indices, to form a beam performance index series; and

selecting the first beam according to the beam performance index series, wherein a first beam performance index corresponding to the first beam is a maximum among the plurality of beam performance indices.

3. The wireless device of claim 2 , wherein the processing circuit performs the following steps, to select the second beam according to the table:

selecting the second beam according to the beam performance index series, wherein a second beam performance index corresponding to the second beam is less than the maximum among the plurality of beam performance indices.

4. The wireless device of claim 3 , wherein the second beam performance index is a second maximum among the beam performance index series.

5. The wireless device of claim 1 , wherein the processing circuit further performs the following steps:

determining whether a second beam performance value corresponding to the second beam is less than the threshold value; and

selecting a third beam according to the table when the second beam performance value is less than the threshold value, wherein the wireless device switches to the third beam to perform data transmission.

6. The wireless device of claim 5 , wherein the processing circuit further performs the following steps:

determining whether the first beam performance value corresponding to the first beam is greater than the threshold value when the wireless device utilizes the third beam to perform data transmission; and

re-selecting the first beam when the first beam performance value is greater than the threshold value, wherein the wireless device switches to the first beam to perform data transmission.

7. The wireless device of claim 1 , wherein the transceiving circuit comprises:

a first antenna module, configured to receive a received signal;

a forwarding module, configured to generate a forward signal according to the received signal; and

a second antenna module, configured to forward the forward signal to the user device.

8. The wireless device of claim 7 , wherein the plurality of beams is formed between at least a station and the wireless device, the received signal is transmitted via the plurality of beams to the first antenna module, the user device generates the plurality of beam performance parameters corresponding to the plurality of beams according to the forward signal and sends the plurality of beam performance parameters back to the wireless device, and the second antenna module receives the plurality of beam performance parameters corresponding to the plurality of beams.

9. The wireless device of claim 7 , wherein the plurality of beams is formed between the wireless device and the user device, the forward signal is transmitted by the second antenna module via the plurality of beams to the user device, the user device generates the plurality of beam performance parameters corresponding to the plurality of beams according to the forward signal and sends the plurality of beam performance parameters back to the wireless device, and the second antenna module receives the plurality of beam performance parameters corresponding to the plurality of beams.

10. The wireless device of claim 7 , wherein the first antenna module is a millimeter wave (mmWave) antenna module.

11. The wireless device of claim 1 , wherein the at least a first beam performance parameter corresponding to the first beam is at least one of a throughput, a reference signal receiving quality (RSRQ) and a signal to interference plus noise ratio (SINK) corresponding to the first beam.

12. A beam recovery method, applied in a wireless device, the beam recovery method comprising:

receiving a plurality of beam performance parameters corresponding to a plurality of beams, wherein the plurality of beam performance parameters is generated by a user device;

forming a table according to a relationship between the plurality of beams and the plurality of beam performance parameters, and store the table in a storage circuit of the wireless device;

selecting a first beam according to the table, wherein the wireless device utilizes the first beam to perform data transmission;

determining whether a first beam performance value corresponding to the first beam is less than a threshold value, wherein the first beam performance value is related to at least a first beam performance parameter corresponding to the first beam; and

selecting a second beam according to the table when the first beam performance value is less than the threshold value, wherein the wireless device switches to the second beam to perform data transmissions;

wherein the beam recovery method further comprises:

determining whether the first beam performance value corresponding to the first beam is greater than the threshold value when the wireless device utilizes the second beam to perform data transmission; and

re-selecting the first beam when the first beam performance value is greater than the threshold value, wherein the wireless device switches to the first beam to perform data transmission.

13. The beam recovery method of claim 12 , wherein the step of selecting the first beam according to the table comprises:

obtaining a plurality of beam performance indices corresponding to the plurality of beams according to the plurality of beam performance parameters;

performing a sorting operation on the plurality of beam performance indices, to form a beam performance index series; and

selecting the first beam according to the beam performance index series, wherein a first beam performance index corresponding to the first beam is a maximum among the plurality of beam performance indices.

14. The beam recovery method of claim 13 , wherein the step of selecting the second beam according to the table comprises:

selecting the second beam according to the beam performance index series, wherein a second beam performance index corresponding to the second beam is less than the maximum among the plurality of beam performance indices.

15. The beam recovery method of claim 14 , wherein the second beam performance index is a second maximum among the beam performance index series.

16. The beam recovery method of claim 12 , further comprising:

determining whether a second beam performance value corresponding to the second beam is less than the threshold value; and

selecting a third beam according to the table when the second beam performance value is less than the threshold value, wherein the wireless device switches to the third beam to perform data transmission.

17. The beam recovery method of claim 16 , further comprising:

determining whether the first beam performance value corresponding to the first beam is greater than the threshold value when the wireless device utilizes the third beam to perform data transmission; and

re-selecting the first beam when the first beam performance value is greater than the threshold value, wherein the wireless device switches to the first beam to perform data transmission.

18. A wireless system, comprising:

a wireless device, comprising:

a transceiving circuit, configured to receive a plurality of beam performance parameters corresponding to a plurality of beams;

a storage circuit, configured to store a table, wherein the table stores a relationship between the plurality of beams and the plurality of beam performance parameters; and

a processing circuit, configured to perform the following steps:

selecting a first beam according to the table, wherein the wireless device utilizes the first beam to perform data transmission;

determining whether a first beam performance value corresponding to the first beam is less than a threshold value, wherein the first beam performance value is related to at least a first beam performance parameter corresponding to the first beam; and

selecting a second beam according to the table when the first beam performance value is less than the threshold value, wherein the wireless device switches to the second beam to perform data transmission; and

a user device, configured to generate the plurality of beam performance parameters, and send the plurality of beam performance parameters to the wireless device;

wherein the processing circuit further performs the following steps:

determining whether the first beam performance value corresponding to the first beam is greater than the threshold value when the wireless device utilizes the second beam to perform data transmission; and

re-selecting the first beam when the first beam performance value is greater than the threshold value, wherein the wireless device switches to the first beam to perform data transmission.

19. The wireless system of claim 18 , wherein the transceiving circuit receives a received signal from at least a station, the received signal is transmitted via the plurality of beams to the transceiving circuit; the wireless device generates a forward signal according to the received signal and forwards the forward signal to the user device; the user device generates the plurality of beam performance parameters corresponding to the plurality of beams according to the forward signal and sends the plurality of beam performance parameters back to the wireless device; and the plurality of beams is formed between the at least a station and the wireless device.

20. The wireless system of claim 18 , wherein the plurality of beams is formed between the wireless device and the user device, the wireless device sends a forward signal to the user device, and the user device generates the plurality of beam performance parameters corresponding to the plurality of beams according to the forward signal and sends the plurality of beam performance parameters back to the wireless device.