Methods for synchronous access of unlicensed medium by grouping small cells in licensed assisted access (LAA) networks

• US 10,237,745 B2
• Filed: 09/29/2015
• Issued: 03/19/2019
• Est. Priority Date: 09/29/2015
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Salem, Mohamed Adel, Maaref, Amine
• Primary Examiner(s): Skripnikov, Alex
• Assistant Examiner(s): Chowdhury, Sharmin
• Application Number:
  US14/869,617
• Publication Number:
  US 20170094584A1
• Time in Patent Office: 1,267 Days
• CPC Class Codes: H04W 16/10 Dynamic resource partitioning
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 48/18 Selecting a network or a communication service

Abstract

Methods and systems for managing access of a communication resource in a licensed assisted access (LAA) network. Each transmission point (TP) of a plurality of TPs provides a first set of information indicative of expected usage of a first communication resource by each TP. Information is transmitted to the TPs to cause each TP to align usage or reservation of the first communication resource with any other TP belonging to a first radio access cluster (RAC) to which the given TP belongs, the first RAC being one in a first set of one or more RACs, wherein each of the plurality of TPs belongs to a respective RAC in the first set of RACs and each RAC in the first set of RACs contains one or more TPs.

Claims

1. A method for managing access of a communication resource in a network, the method comprising:

receiving, from a plurality of transmission points (TPs), a first set of information indicative of expected usage of a first communication resource by each TP;

in accordance with the first set of information, defining, based on calculation of a soft airtime (SAT) share, a first set of one or more radio access clusters (RACs) to manage the expected usage of the first communication resource, each RAC including a respective set of one or more TPs of the plurality of TPs, wherein the SAT share is proportional to a served load and is inversely proportional to a coexisting load, the served load representing usage of the first communication resource by a RAC, and the coexisting load representing usage of the first communication resource by one or more coexisting networks in an area of influence impacted by usage of the first communication resource by the RAC;

wherein a first RAC in the first set of RACs is defined to include a first TP when a merged SAT share, calculated for the first TP grouped together with the first RAC, is greater than or equal to a first SAT share, calculated for the first RAC without the first TP; and

transmitting timing information to the plurality of TPs to cause each given TP to align timing of usage or reservation of the first communication resource with any other TP belonging to a same RAC to which the given TP belongs, and wherein causing each given TP to align timing further causes each given TP to have a common airtime share of the first communication resource to access the first communication resource simultaneously with any other TP belonging to the same RAC.

2. The method of claim 1, further comprising:

receiving a second set of information indicative of expected usage of a second communication resource by each TP;

in accordance with the second set of information, defining a second set of one or more RACs to manage the expected usage of the second communication resource; and

transmitting the timing information to the plurality of TPs to cause each given TP to align timing of usage or reservation of the second communication resource with any other TP belonging to a same RAC, of the second set of RACs, to which the given TP belongs, and wherein causing each given TP to align timing further causes each given TP to have a common airtime share of the second communication resource to access the second communication resource simultaneously with any other TP belonging to the same RAC of the second set of RACs.

3. The method of claim 1, wherein the received first set of information comprises information about a coexisting load impacted by transmission by each TP and served load of each TP.

4. The method of claim 1, further comprising:

transmitting information to the plurality of TPs to cause each TP belonging to a given RAC to synchronize sensing of availability of the first communication resource with any other TP belonging to the given RAC.

5. The method of claim 4, further comprising:

receiving a third set of information from the plurality of TPs, the third set of information including information about the availability of the first communication resource for access by the TPs;

wherein the timing information transmitted to the plurality of TPs includes information to cause each TP belonging to the given RAC to align timing of usage or reservation of the first communication resource with any other TP belonging to the given RAC within an access window determined in accordance with the third set of information.

6. The method of claim 1, performed by a server associated with the plurality of TPs, wherein the first set of information is received from the plurality of TPs in response to a request for information sent from the server to the TPs.

7. The method of claim 1, performed by a first server associated with the plurality of TPs, further comprising:

receiving, from a second server associated with a different plurality of TPs, aggregated information indicative of expected usage of the first communication resource by the different plurality of TPs; and

in accordance with the aggregated information, transmitting information to the second server and to at least one first TP associated with the first server and belonging to a cross-server RAC to cause the at least one first TP and at least one second TP associated with the second server and belonging to the cross-server RAC to align timing of usage of the first communication resource with each other.

8. The method of claim 7, further comprising:

for the cross-server RAC;

transmitting information to the second server and to the at least one first TP to cause the TPs belonging to the cross-server RAC to synchronize sensing of availability of the first communication resource;

for other RACs;

transmitting information to the one or more TPs belonging to the RAC to cause the one or more TPs belonging to the RAC to synchronize sensing of availability of the first communication resource; and

receiving a second set of information from the plurality of TPs and from the second server, the second set of information including information about the availability of the first communication resource for access by the TPs, including TPs belonging to the cross-server RAC;

wherein the information transmitted to the plurality of TPs and to the second server includes information to cause each TP belonging to each given RAC to align timing of usage or reservation of the first communication resource with any other TP belonging to the given RAC within an access window determined in accordance with the second set of information.

22. The method of claim 1 wherein each given TP is caused to align timing of usage or reservation of the first communication resource for each upcoming frame.

9. A system for managing access of a communication resource in a network, the system comprising a processor configured to execute instructions that cause the system to:

receive, from a plurality of transmission points (TPs) associated with the system, a first set of information indicative of expected usage of a first communication resource by each TP;

in accordance with the first set of information, define, based on calculation of a soft airtime (SAT) share, a first set of one or more radio access clusters (RACs) to manage the expected usage of the first communication resource, each RAC including a respective set of one or more TPs of the plurality of TPs, wherein the SAT share is proportional to a served load and is inversely proportional to a coexisting load, the served load representing usage of the first communication resource by a RAC, and the coexisting load representing usage of the first communication resource by one or more coexisting networks in an area of influence impacted by usage of the first communication resource by the RAC;

wherein a first RAC in the first set of RACs is defined to include a first TP when a merged SAT share, calculated for the first TP grouped together with the first RAC, is greater than or equal to a first SAT share, calculated for the first RAC without the first TP; and

transmit timing information to the plurality of TPs to cause each given TP to align timing of usage or reservation of the first communication resource with any other TP belonging to a same RAC to which the given TP belongs, and wherein causing each given TP to align timing further causes each given TP to have a common airtime share of the first communication resource to access the first communication resource simultaneously with any other TP belonging to the same RAC.

10. The system of claim 9, wherein the processor is configured to execute instructions that further cause the system to:

receive a second set of information indicative of expected usage of a second communication resource by each TP;

in accordance with the second set of information, define a second set of one or more RACs to manage the expected usage of the second communication resource; and

transmit the timing information to the plurality of TPs to cause each given TP to align timing of usage or reservation of the second communication resource with any other TP belonging to a same RAC, of the second set of RACs, to which the given TP belongs, and wherein causing each given TP to align timing further causes each given TP to have a common airtime share of the second communication resource to access the second communication resource simultaneously with any other TP belonging to the same RAC of the second set of RACs.

11. The system of claim 9, wherein the received first set of information comprises information about a coexisting load impacted by transmission by each TP and served load of each TP.

12. The system of claim 9, wherein the processor is configured to execute instructions that further cause the system to:

transmit information to the plurality of TPs to cause each TP belonging to a given RAC to synchronize sensing of availability of the first communication resource with any other TP belonging to the given RAC.

13. The system of claim 12, wherein the processor is configured to execute instructions that further cause the system to:

receive a third set of information from the plurality of TPs, the third set of information including information about the availability of the first communication resource for access by the TPs;

wherein the timing information transmitted to the plurality of TPs includes information to cause each TP belonging to the given RAC to align timing of usage or reservation of the first communication resource with any other TP belonging to the given RAC within an access window determined in accordance with the second set of information.

14. The system of claim 9, wherein the first set of information is received from the plurality of TPs in response to a request for information sent from the system to the TPs.

15. The system of claim 9, wherein the system is a first system associated with the plurality of TPs, wherein the processor is configured to execute instructions that further cause the system to:

receive, from a second system associated with a different plurality of TPs, aggregated information indicative of expected usage of a first communication resource by the different plurality of TPs; and

in accordance with the aggregated information, transmit information to the second system and to at least one first TP associated with the first system and belonging to a cross-server RAC to cause the at least one first TP and at least one second TP associated with the second system and belonging to the cross-server RAC to align timing of usage of the first communication resource with each other.

16. The system of claim 15, wherein the processor is configured to execute instructions that further cause the system to:

for the cross-server RAC;

transmit information to the second server and to the at least one first TP to cause the TPs belonging to the cross-server RAC to synchronize sensing of availability of the first communication resource;

for other RACs;

transmit information to the one or more TPs belonging to the RAC to cause the one or more TPs belonging to the RAC to synchronize sensing of availability of the first communication resource; and

receive a second set of information from the plurality of TPs and from the second server, the second set of information including information about the availability of the first communication resource for access by the TPs, including TPs belonging to the cross-server RAC;

wherein the information transmitted to the plurality of TPs and to the second server includes information to cause each TP belonging to each given RAC to align timing of usage or reservation of the first communication resource with any other TP belonging to the given RAC within an access window determined in accordance with the second set of information.

17. A method, by a transmission point (TP), for accessing a communication resource in a network, the method comprising:

transmitting, to a central server, a first set of information indicative of expected usage of a first communication resource by the TP, the first set of information including information about a first coexisting load, the first coexisting load representing usage of the first communication resource by one or more coexisting networks in an area of influence impacted by usage of the first communication resource by the TP, and also including information about a first served load of the TP, the first served load representing usage of the first communication resource by the TP;

receiving information from the central server about a radio access cluster (RAC) to which the TP belongs, the information including timing information for accessing the first communication resource, the timing information causing the TP to align timing of usage or reservation of the first communication resource with any other TP belonging to the RAC, and the timing information further causing the TP to have a common airtime share of the first communication resource to access the first communication resource simultaneously with any other TP belonging to the RAC;

receiving information from the central server to cause the TP to perform synchronized sensing of availability of the first communication resource with other TPs belonging to the RAC; and

accessing or reserving the first communication resource in accordance with the timing information;

wherein the RAC is defined, by the central server, based on calculation of a soft airtime (SAT) share, wherein the SAT share is proportional to a served load and is inversely proportional to a coexisting load, the served load representing usage of the first communication resource by the RAC, and the coexisting load representing usage of the first communication resource by one or more coexisting networks in an area of influence impacted by usage of the first communication resource by the RAC; and

wherein the RAC is defined, by the central server, to include the TP when a merged SAT share, calculated for the TP grouped together with the RAC, is greater than or equal to a first SAT share, calculated for the RAC without the TP.

18. The method of claim 17, further comprising:

transmitting, to the central server, a second set of information indicative of expected usage of a second communication resource by the TP, the second set of information including information about a second coexisting load, the second coexisting load representing usage of the second communication resource by one or more coexisting networks in an area of influence impacted by usage of the second communication resource by the TP, and also including information about a second served load of the TP, the second served load representing usage of the second communication resource by the TP;

receiving information from the central server about a different RAC to which the TP belongs, the different RAC being used for the second communication resource, the information including timing information for accessing the second communication resource, the timing information causing the TP to align timing of usage or reservation of the second communication resource with any other TP belonging to the different RAC, and causing the TP to have a common airtime share of the second communication resource to access the second communication resource simultaneously with any other TP belonging to the different RAC;

receiving information from the central server to cause the TP to perform synchronized sensing of availability of the second communication resource with other TPs belonging to the different RAC; and

accessing or reserving the second communication resource in accordance with the timing information.

19. The method of claim 17, further comprising:

transmitting, to the central server, a third set of information, the third set of information including information about the availability of the first communication resource for access by the TP;

wherein the timing information received from the central server includes information to cause the TP to align timing of usage or reservation of the first communication resource with any other TP belonging to the RAC within an access window.

20. The method of claim 17, wherein the first set of information is transmitted in response to a request for information sent from the central server to the TP.

21. The method of claim 17, wherein the first set of information is transmitted in response to detection of a trigger condition at the TP.