Claims:We claim:
1. A method for performing Handover (HO) in a Long-Range Land-To-Sea (LRLS) wireless network, comprising:
receiving, by a HO management system of a Customer Premise Equipment (CPE), one or more configuration parameters from the CPE, wherein the CPE comprises an active AA communicating with a Base Transceiver Station (BTS) and one or more inactive AAs;
retrieving, by the HO management system, based on data traffic between the CPE and the BTS, at least one of,
Signal to Noise Ratio (SNR) values on uplink and downlink corresponding to the active AA and at least one adjacent neighbor AA of the active AA, wherein the SNR values are retrieved by scanning at least one adjacent neighbor AA of the active AA based on the configuration parameters, and
Modulation and Coding Scheme (MCS) throughput values on the uplink and the downlink corresponding to the active AA and immediate neighbor AA pair of the active AA, wherein the MCS throughput values are retrieved by dwelling on each of the immediate neighbor AA pair of the active AA based on the configuration parameters;
determining, by the HO management system, a target AA based on one of the SNR values and the MCS throughput values on the uplink and the downlink; and
initiating, by the HO management system, a HO from active AA to the determined target AA, for performing an inter-AA HO.

2. The method as claimed in claim 1, wherein the active AA has a pre-defined signal link strength for communicating with the BTS and is in Line of Sight (LoS) with the BTS, and the inactive AAs are neighbors of the active AA.

3. The method as claimed in claim 1, wherein the one or more configuration parameters comprises AA periodic scan interval for retrieval of SNR values (TSS), AA periodic scan interval for retrieval of MCS throughput values (TSF), AA dwell time for retrieval of SNR values (TDS), AA dwell time for retrieval of MCS throughput values (TDF), SNR expiry time (TSNR), and MCS expiry time (TMCS).

4. The method as claimed in claim 1, wherein the CPE signals the BTS for entering a scanning mode.

5. The method as claimed in claim 1, wherein the at least one adjacent neighbor AA of the active AA is scanned for a pre-defined scan interval based on AA dwell time for retrieval of SNR values (TDS) for retrieving the SNR values and each of the at least one adjacent neighbor AA of the active AA is scanned using a pre-defined scan order.

6. The method as claimed in claim 5, wherein the SNR values are computed and retrieved based on a stats frame mechanism, wherein the CPE and the BTS alternate stats frames in the uplink and the downlink, and wherein each of the stats frames comprises a corresponding SNR value.

7. The method as claimed in claim 1, wherein processing the SNR values for determining the target AA comprises:
storing, by the HO management system, the SNR values retrieved on the uplink and the downlink in SNR uplink circular buffers and SNR downlink circular buffers;
determining, by the HO management system, a confidence percentage for each of the at least one adjacent neighbor AA of the active AA and the active AA based on the SNR uplink circular buffers and the SNR downlink circular buffers, wherein the confidence percentage indicates a percentage of highest SNR values obtained for the active AA and each of the at least one adjacent neighbor AA of the active AA; and
comparing, by the HO management system, the confidence percentage of each of the at least one adjacent neighbor AA of the active AA and the active AA with a first threshold value, for determining the target AA.
8. The method as claimed in claim 7, wherein the SNR values in the SNR uplink circular buffers and the SNR downlink circular buffers are purged out after a period of SNR expiry time (TSNR).

9. The method as claimed in claim 1, wherein the MCS throughput values are retrieved by switching from the active AA to each of the immediate neighbor AA pair of the active AA for a pre-defined AA dwell time for retrieval of MCS throughput values (TDF).

10. The method as claimed in claim 1, wherein processing the MCS throughput values for determining the target AA comprises:
storing, by the HO management system, the MCS throughput values retrieved on the uplink and the downlink in MCS uplink circular buffers and MCS downlink circular buffers;
determining, by the HO management system, a confidence percentage for each of the immediate neighbor AA pair of the active AA and the active AA based on the MCS uplink circular buffers and the MCS downlink circular buffers, wherein the confidence percentage indicates a percentage of highest MCS throughput values obtained for each of the immediate neighbor AA pair of the active AA and the active AA; and
comparing, by the HO management system, the confidence percentage of each of the immediate neighbor AA pair of the active AA and the active AA with a second threshold value, for determining the target AA.
11. The method as claimed in claim 10, wherein the MCS throughput values in the MCS uplink circular buffers and the MCS downlink circular buffers are purged out after a period of MCS expiry time (TMCS).

12. A method for performing Handover (HO) in a Long-Range Land-To-Sea (LRLS) wireless network, comprising:
retrieving, by the HO management system, one of SNR values and MCS throughput values on uplink and downlink corresponding to a target AA based on data traffic between a Customer Premise Equipment (CPE) and a Base Transceiver Station (BTS);
storing, by the HO management system, the SNR values retrieved on the uplink and the downlink in the SNR uplink circular buffers and the SNR downlink circular buffers and the MCS throughput values retrieved on the uplink and the downlink in MCS uplink circular buffers and the MCS downlink circular buffers, wherein each of the SNR values are subjected to weighting to obtain corresponding Aggregate Weighted SNR (AWSNR) values;
identifying, by the HO management system, one of:
AWSNR values less than a third threshold value on the SNR uplink circular buffers and the SNR downlink circular buffers; and
the MCS throughput values less than a fourth threshold value on the MCS uplink circular buffers and the MCS downlink circular buffers;
determining, by the HO management system, one of:
a confidence percentage for the uplink and the downlink based on the identification of the AWSNR values, wherein the confidence percentage is a percentage ratio of number of AWSNR values identified and total number of the AWSNR values in the SNR uplink circular buffers and the SNR downlink circular buffers; and
a confidence percentage for the uplink and the downlink based on the identification of the MCS throughput values, wherein the confidence percentage is a percentage ratio of number of the MCS throughput values identified and total number of the MCS throughput values in the MCS uplink circular buffers and the MCS downlink circular buffers; and
performing, by the HO management system, HO to Very Small Aperture Terminal (VSAT) network from the target AA, when the confidence percentage of one of the uplink and the downlink determined based on the AWSNR values and the MCS throughput values is greater than a fifth threshold value and sixth threshold value.
13. The method as claimed in 12, further comprising:
retrieving, by the HO management system of CPE, one of SNR values and MCS throughput values on the uplink and the downlink corresponding to a new target AA determined by the CPE after HO to VSAT has been performed, wherein each of the SNR values are subjected to weighting to obtain corresponding AWSNR values;
storing, by the HO management system of CPE, the SNR values retrieved on the uplink and the downlink in the SNR uplink circular buffers and the SNR downlink circular buffers and the MCS throughput values retrieved on the uplink and the downlink in the MCS uplink circular buffers and the MCS downlink circular buffers;
identifying, by the HO management system, one of:
the AWSNR values greater than and equal to a seventh threshold value on the SNR uplink circular buffers and the SNR downlink circular buffers; and
the MCS throughput values greater than and equal to an eighth threshold value on the MCS uplink and downlink circular buffers;
determining, by the HO management system, one of:
a confidence percentage for the uplink and the downlink based on the identification of the AWSNR values, wherein the confidence percentage is a percentage ratio of number of AWSNR values identified and total number of AWSNR values in the SNR uplink circular buffers and the SNR downlink circular buffers; and
a confidence percentage for the uplink and the downlink based on the identification of the MCS throughput values, wherein the confidence percentage is a percentage ratio of number of MCS throughput values identified and total number of MCS throughput values in the MCS uplink circular buffers and the MCS downlink circular buffers; and
performing, by the HO management system, a network re-entry to the LRLS network by initiating HO to the new target AA of the LRLS network from the VSAT network, if the confidence percentage on both the uplink and the downlink determined based on the AWSNR values and the MCS throughput values is greater than a ninth threshold value and tenth threshold value.
14. A Handover (HO) management system of a Customer Premise Equipment (CPE) for performing HO in a Long-Range Land-To-Sea (LRLS) wireless network, the HO management system comprising:
a processor; and
a memory, communicatively coupled with the processor, storing processor executable instructions, which, on execution causes the processor to:
receive, one or more configuration parameters from the CPE, wherein the CPE comprises an active AA communicating with a Base Transceiver Station (BTS) and one or more inactive AAs;
retrieve, based on data traffic between the CPE and the BTS, at least one of,
Signal to Noise Ratio (SNR) values on uplink and downlink corresponding to the active AA and at least one adjacent neighbor AA of the active AA, wherein the SNR values are retrieved by scanning at least one adjacent neighbor AA of the active AA based on the configuration parameters, and
Modulation and Coding Scheme (MCS) throughput values on the uplink and the downlink corresponding to the active AA and immediate neighbor AA pair of the active AA, wherein the MCS throughput values are retrieved by dwelling on each of the immediate neighbor AA pair of the active AA based on the configuration parameters;
determine, a target AA based on one of the SNR values and the MCS throughput values on the uplink and the downlink; and
initiate, a HO from active AA to the determined target AA, for performing an inter-AA HO.

15. The HO management system as claimed in claim 14, wherein the active AA has a pre-defined signal link strength for communicating with the BTS and is in Line of Sight (LoS) with the BTS, and the inactive AAs are neighbors of the active AA.

16. The HO management system as claimed in claim 14, wherein the one or more configuration parameters comprises AA periodic scan interval for retrieval of SNR values (TSS), AA periodic scan interval for retrieval of MCS throughput values (TSF), AA dwell time for retrieval of SNR values (TDS), AA dwell time for retrieval of MCS throughput values (TDF), SNR expiry time (TSNR), and MCS expiry time (TMCS).

17. The HO management system as claimed in claim 14, wherein the CPE signals the BTS for entering a scanning mode.

18. The HO management system as claimed in claim 14, wherein the at least one adjacent neighbor AA of the active AA is scanned for a pre-defined scan interval based on AA dwell time for retrieval of SNR values (TDS) for retrieving the SNR values and each of the at least one adjacent neighbor AA of the active AA is scanned using a pre-defined scan order.

19. The HO management system as claimed in claim 18, wherein the SNR values are computed and retrieved based on a stats frame mechanism, wherein the CPE and the BTS alternate stats frames in the uplink and the downlink, and wherein each of the stats frames comprises a corresponding SNR value.

20. The HO management system as claimed in claim 14, wherein processing of the SNR values for determining the target AA comprises:
storing, the SNR values retrieved on the uplink and the downlink in SNR uplink circular buffers and SNR downlink circular buffers;
determining, a confidence percentage for each of the at least one adjacent neighbor AA of the active AA and the active AA based on the SNR uplink circular buffers and the SNR downlink circular buffers, wherein the confidence percentage indicates a percentage of highest SNR values obtained for the active AA and each of the at least one adjacent neighbor AA of the active AA; and
comparing, the confidence percentage of each of the at least one adjacent neighbor AA of the active AA and the active AA with a first threshold value, for determining the target AA.
21. The HO management system as claimed in claim 20, wherein the SNR values in the SNR uplink circular buffers and the SNR downlink circular buffers are purged out after a period of SNR expiry time (TSNR).

22. The HO management system as claimed in claim 14, wherein the MCS throughput values are retrieved by switching from the active AA to each of the immediate neighbor AA pair of the active AA for a pre-defined AA dwell time for retrieval of MCS throughput values (TDF).

23. The HO management system as claimed in claim 14, wherein processing of the MCS throughput values for determining the target AA comprises:
storing the MCS throughput values retrieved on the uplink and the downlink in MCS uplink circular buffers and MCS downlink circular buffers;
determining a confidence percentage for each of the immediate neighbor AA pair of the active AA and the active AA based on the MCS uplink circular buffers and the MCS downlink circular buffers, wherein the confidence percentage indicates a percentage of highest MCS throughput values obtained for each of the immediate neighbor AA pair of the active AA and the active AA; and
comparing the confidence percentage of each of the immediate neighbor AA pair of the active AA and the active AA with a second threshold value, for determining the target AA.
24. The HO management system as claimed in claim 23, wherein the MCS throughput values in the MCS uplink circular buffers and the MCS downlink circular buffers are purged out after a period of MCS expiry time (TMCS).

25. A Handover (HO) management system of a Customer Premise Equipment (CPE) for performing HO in a Long-Range Land-To-Sea (LRLS) wireless network, the HO management system comprising:
a processor; and
a memory, communicatively coupled with the processor, storing processor executable instructions, which, on execution causes the processor to:
retrieve, one of SNR values and MCS throughput values on uplink and downlink corresponding to a target AA based on data traffic between a Customer Premise Equipment (CPE) and a Base Transceiver Station (BTS);
storing the SNR values retrieved on the uplink and the downlink in the SNR uplink circular buffers and the SNR downlink circular buffers and the MCS throughput values retrieved on the uplink and the downlink in MCS uplink circular buffers and the MCS downlink circular buffers, wherein each of the SNR values are subjected to weighting to obtain corresponding Aggregate Weighted SNR (AWSNR) values;
identify, one of:
AWSNR values less than a third threshold value on the SNR uplink circular buffers and the SNR downlink circular buffers; and
the MCS throughput values less than a fourth threshold value on the MCS uplink circular buffers and the MCS downlink circular buffers;
determine, one of:
a confidence percentage for the uplink and the downlink based on the identification of the AWSNR values, wherein the confidence percentage is a percentage ratio of number of AWSNR values identified and total number of the AWSNR values in the SNR uplink circular buffers and the SNR downlink circular buffers; and
a confidence percentage for the uplink and the downlink based on the identification of the MCS throughput values, wherein the confidence percentage is a percentage ratio of number of the MCS throughput values identified and total number of the MCS throughput values in the MCS uplink circular buffers and the MCS downlink circular buffers; and
perform, HO to Very Small Aperture Terminal (VSAT) network from the target AA, when the confidence percentage of one of the uplink and the downlink determined based on the AWSNR values and the MCS throughput values is greater than a fifth threshold value and sixth threshold value.
26. The HO management system as claimed in claim 25, wherein performing HO in LRLS network further comprises:
retrieving, one of SNR values and MCS throughput values on the uplink and the downlink corresponding to a new target AA determined by the CPE after HO to VSAT has been performed, wherein each of the SNR values are subjected to weighting to obtain corresponding AWSNR values;
storing the SNR values retrieved on the uplink and the downlink in the SNR uplink circular buffers and the SNR downlink circular buffers and the MCS throughput values retrieved on the uplink and the downlink in the MCS uplink circular buffers and the MCS downlink circular buffers;
identifying, one of:
the AWSNR values greater than and equal to a seventh threshold value on the SNR uplink circular buffers and the SNR downlink circular buffers; and
the MCS throughput values greater than and equal to an eighth threshold value on the MCS uplink and downlink circular buffers;
determining, one of:
a confidence percentage for the uplink and the downlink based on the identification of the AWSNR values, wherein the confidence percentage is a percentage ratio of number of AWSNR values identified and total number of AWSNR values in the SNR uplink circular buffers and the SNR downlink circular buffers; and
a confidence percentage for the uplink and the downlink based on the identification of the MCS throughput values, wherein the confidence percentage is a percentage ratio of number of MCS throughput values identified and total number of MCS throughput values in the MCS uplink circular buffers and the MCS downlink circular buffers; and

performing, a network re-entry to the LRLS network by initiating HO to the new target AA of the LRLS network from the VSAT network, if the confidence percentage on both the uplink and the downlink determined based on the AWSNR values and the MCS throughput values is greater than a ninth threshold value and tenth threshold value.
Dated this 9th day of April, 2018

R Ramya Rao
Of K&S Partners
Agent for the Applicant
IN/PA-1607
, Description:TECHNICAL FIELD

The present subject matter is related, in general, to a long range wireless communication, and more particularly, but not exclusively, to a method and system for performing Handover (HO) in a Long-Range Land-to-Sea (LRLS) wireless network.