Cooperative Components in a Wireless Feeder Network

• US 20130242899A1
• Filed: 03/01/2013
• Published: 09/19/2013
• Est. Priority Date: 03/13/2012
• Status: Active Grant

• Current Assignee: Airspan IP Holdco LLC (Airspan Networks Holdings, Inc.)
• Original Assignee: Airspan Networks Inc.
• Inventors: Lysejko, Martin, Logothetis, Andrew, Warman, David
• Granted Patent: US 9,560,676 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04L 1/004 by using forward error control H04L1/0618 takes precedence; coding, decoding or code conversion, for error detection or correction H03M13/00
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0035 Resource allocation in a cooperative multipoint environment
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04W 76/00 Connection management

Abstract

A wireless feeder network comprises feeder base stations coupled to the communications network and feeder terminals coupled to associated access base stations of the access network. A group of wireless network components form elements of a feeder cluster and the elements of the feeder cluster are connected by an additional communications resource configured to be operated in parallel with the wireless resource of the wireless feeder network. Both a primary and secondary element of the feeder cluster seek to decode at least one resource block allocated to the primary element for reception of data. Information derived from the secondary decoded data is transmitted from the secondary element to the primary element via the additional communications resource. The primary element then performs a revised decoding process additionally using the information received from said secondary element to improve its own decode probability.

Claims

1. A method of operating a wireless feeder network used to couple access base stations of an access network with a communications network, the wireless feeder network comprising a plurality of wireless feeder network components, the plurality of wireless feeder network components comprising a plurality of feeder base stations coupled to the communications network and a plurality of feeder terminals coupled to associated access base stations, each feeder terminal having a feeder link with a feeder base station, and the feeder links being established over a wireless resource comprising a plurality of resource blocks, the method comprising the steps of:

grouping a plurality of said wireless network components together as elements of a feeder cluster, said elements comprising a primary element and a secondary element;

providing connections between said elements of said feeder cluster, wherein said connections are mediated by an additional wired communications resource configured to be operated in parallel with said wireless resource;

in said primary element of said feeder cluster, receiving data transmitted via said wireless resource and performing a primary decoding process to seek to decode at least one resource block allocated for reception of data by said primary element and thereby generate primary decoded data;

in said secondary element of said feeder cluster, receiving said data transmitted via said wireless resource and performing a secondary decoding process to seek to decode said at least one resource block allocated for reception of data by said primary element and thereby generate secondary decoded data;

transmitting information derived from said secondary decoded data from said secondary element to said primary element via said additional wired communications resource; and

in said primary element of said feeder cluster, performing a revised primary decoding process additionally using said information derived from said secondary decoded data received from said secondary element to decode more reliably said at least one resource block allocated for reception of data by said primary element,

wherein said secondary decoding process comprises a linked sequence of decoding stages, wherein said secondary element stores said decoded data from each stage of said linked sequence of decoding stages, and said information derived from said secondary decoded data transmitted from said secondary element to said primary element via said additional wired communications resource comprises decoded data from a selected decoding stage.

2. The method of operating a wireless feeder network as claimed in claim 1, wherein said decoded data transmitted from said secondary element to said primary element via said additional wired communications resource is compressed by a compression process, wherein said compression process preferably comprises at least one of:

decimation of said decoded data; and

quantisation of said decoded data.

3. The method of operating a wireless feeder network as claimed in claim 1, comprising the further step, performed after performance of said primary decoding process, of:

transmitting a data request to said secondary element from said primary element via said additional wired communications resource,

said secondary element transmitting said information derived from said secondary decoded data in response to said data request, wherein said secondary element performs said secondary decoding process prior to receiving said data request from said primary element.

4. The method of operating a wireless feeder network as claimed in claim 3, wherein said decoded data transmitted from said secondary element to said primary element via said additional wired communications resource is compressed by a compression process, wherein said compression process preferably comprises at least one of:

decimation of said decoded data; and

quantisation of said decoded data,

wherein said data request specifies said selected decoding stage, and a type and a level of said compression process.

5. The method of operating a wireless feeder network as claimed in claim 3, comprising the further step, performed after performing said revised primary decoding process if said at least one resource block allocated for reception of data by said primary element has not yet been successfully decoded, of:

transmitting a further data request to said secondary element from said primary element, said further data request requesting further information derived from said secondary decoded data.

6. The method of operating a wireless feeder network as claimed in claim 1, wherein said secondary element performs said secondary decoding process and transmits said information derived from said secondary decoded data to said primary element unsolicited by said primary element.

7. The method of operating a wireless feeder network as claimed in claim 6, wherein said secondary element performs said secondary decoding process and transmits said information derived from said secondary decoded data to said primary element in dependence on at least one of:

a resource block usage schedule associated with said primary element; and

at least one predetermined rule.

8. The method of operating a wireless feeder network as claimed in claim 7, wherein said at least one predetermined rule specifies at least one of:

a decimation level;

a quantisation level;

a signal-to-noise ratio dependency;

a modulation and coding scheme dependency;

a multiple-input multiple-output mode dependency;

a resource block dependency;

a primary element dependency; and

a selected decoding stage.

9. The method of operating a wireless feeder network as claimed in claim 7, wherein said secondary element selectively transmits said information derived from said secondary decoded data to said primary element in dependence on a plurality of predetermined rules, and wherein said secondary element is configured to select said decoded data for transmission to said primary element in accordance with the rule which results in a minimum size of said information derived from said secondary decoded data.

10. The method of operating a wireless feeder network as claimed in claim 1, comprising the further steps, performed in said secondary element of said feeder cluster after performing said secondary decoding process, of:

determining decode quality information indicative of said secondary element'"'"'s ability to decode said at least one resource block; and

transmitting said decode quality information from said secondary element to said primary element via said additional wired communications resource.

11. The method of operating a wireless feeder network as claimed in claim 10, wherein said decode quality information comprises at least one of:

signal-to-noise-ratio information; and

an indication of decoding success.

12. The method of operating a wireless feeder network as claimed in claim 10, comprising the further step, performed after performance of said primary decoding process, of:

transmitting an information request to said secondary element from said primary element via said additional wired communications resource,

said secondary element performing said further steps of determining and transmitting in response to said information request.

13. The method of operating a wireless feeder network as claimed in claim 12, wherein said information request specifies at least one of:

a selected resource block;

a modulation coding scheme;

a MIMO mode;

a transmission pre-coding matrix; and

a reception pre-coding matrix.

14. The method of operating a wireless feeder network as claimed in claim 12, wherein said information request is configured to cause said secondary element to continue performing said further steps of determining and transmitting without being requested to do so by said primary element.

15. The method of operating a wireless feeder network as claimed in claim 12, wherein said information request further includes information derived from said primary decoding process.

16. The method of operating a wireless feeder network as claimed in claim 10, comprising the further step, performed after performance of said primary decoding process, of:

transmitting a data request to said secondary element from said primary element via said additional wired communications resource,

said secondary element transmitting said information derived from said secondary decoded data in response to said data request, wherein said secondary element performs said secondary decoding process prior to receiving said data request from said primary element,

wherein said data request transmitted to said secondary element from said primary element via said additional wired communications resource is configured in dependence on said decode quality information received from said secondary element.

17. The method of operating a wireless feeder network as claimed in claim 16, wherein said data request transmitted to said secondary element from said primary element is configured to minimise data transmission via said additional wired communications resource.

18. The method of operating a wireless feeder network as claimed in claim 1, wherein said feeder cluster comprises a plurality of secondary elements, and comprising the further step, performed after receipt of said decode quality information, of:

transmitting a further information request from said primary element to a different secondary element in said feeder cluster, said further information request requesting further decode quality information indicative of said different secondary element'"'"'s ability to decode said at least one resource block.

19. The method of operating a wireless feeder network as claimed in claim 18, wherein said primary element transmits said further information request as a result of a determination that said decode quality information indicates that said secondary decoded data alone will be insufficient to enable said primary element to decode said at least one resource block.

20. The method of operating a wireless feeder network as claimed in claim 18, wherein each of said plurality of secondary elements:

receives said data transmitted via said wireless resource;

performs said secondary decoding process to seek to decode said at least one resource block allocated for reception of data by said primary element and thereby generates said secondary decoded data; and

transmits said information derived from said secondary decoded data to said primary element via said additional wired communications resource.

21. The method of operating a wireless feeder network as claimed in claim 18, comprising the further steps, performed after performance of said primary decoding process, of:

transmitting a data request to said secondary element from said primary element via said additional wired communications resource,

said secondary element transmitting said information derived from said secondary decoded data in response to said data request, wherein said secondary element performs said secondary decoding process prior to receiving said data request from said primary element; and

after performing said revised primary decoding process, if said at least one resource block allocated for reception of data by said primary element has not yet been successfully decoded, transmitting a further data request from said primary element to a different secondary element in said feeder cluster, said further data request requesting further information derived from said secondary decoded data.

22. The method of operating a wireless feeder network as claimed in claim 18, wherein information requests and/or data requests are transmitted to said plurality of secondary elements in turn, in a ranked order of expected ability to decode said at least one resource block based on prior decoding history.

23. The method of operating a wireless feeder network as claimed in claim 1, wherein, if said revised primary decoding process does not successfully decode said at least one resource block, said primary element is configured to issue a retransmission request for said data transmitted via said wireless resource using said at least one resource block, wherein said retransmission request comprises an indication of extent of decoding achieved by said revised primary decoding process.

24. The method of operating a wireless feeder network as claimed in claim 1, wherein said wireless network further comprises a feeder network controller, said feeder network controller determines said elements of a feeder cluster in dependence on a sounding procedure previously carried out in said wireless feeder network.

25. The method of operating a wireless feeder network as claimed in claim 24, wherein said feeder network controller determines a schedule for use of said resource blocks in dependence on results of said sounding procedure.

26. The method of operating a wireless feeder network as claimed in claim 25, wherein said feeder network controller adjusts said schedule in dependence on a decoding improvement resulting from using said information derived from said secondary decoded data in said revised primary decoding process.

27. The method of operating a wireless feeder network as claimed in claim 25, wherein said plurality of said wireless network components are configured to perform said grouping step with reference to said schedule.

28. A wireless feeder network controller configured to control a wireless feeder network used to couple access base stations of an access network with a communications network, the wireless feeder network comprising a plurality of wireless feeder network components, the plurality of wireless feeder network components comprising a plurality of feeder base stations coupled to the communications network and a plurality of feeder terminals coupled to associated access base stations, each feeder terminal having a feeder link with a feeder base station, and the feeder links being established over a wireless resource comprising a plurality of resource blocks, the wireless feeder network controller configured to:

group a plurality of said wireless network components together as elements of a feeder cluster, said elements comprising a primary element and a secondary element, wherein connections between said elements of said feeder cluster are mediated by an additional wired communications resource configured to be operated in parallel with said wireless resource;

cause said primary element of said feeder cluster to receive data transmitted via said wireless resource and to perform a primary decoding process to seek to decode at least one resource block allocated for reception of data by said primary element and thereby generate primary decoded data;

cause said secondary element of said feeder cluster to receive said data transmitted via said wireless resource and to perform a secondary decoding process to seek to decode said at least one resource block allocated for reception of data by said primary element and thereby generate secondary decoded data;

cause said secondary element to transmit information derived from said secondary decoded data from said secondary element to said primary element via said additional wired communications resource; and

cause said primary element of said feeder cluster to perform a revised primary decoding process additionally using said information derived from said secondary decoded data received from said secondary element to decode more reliably said at least one resource block allocated for reception of data by said primary element,

wherein said secondary decoding process comprises a linked sequence of decoding stages, wherein said secondary element stores said decoded data from each stage of said linked sequence of decoding stages, and said information derived from said secondary decoded data transmitted from said secondary element to said primary element via said additional wired communications resource comprises decoded data from a selected decoding stage.

29. A wireless feeder network configured to couple access base stations of an access network with a communications network, the wireless feeder network comprising a plurality of wireless feeder network components, the plurality of wireless feeder network components comprising a plurality of feeder base stations coupled to the communications network and a plurality of feeder terminals coupled to associated access base stations, each feeder terminal having a feeder link with a feeder base station, and the feeder links being established over a wireless resource comprising a plurality of resource blocks, wherein:

a plurality of said wireless network components are configured to be grouped together as elements of a feeder cluster, said elements comprising a primary element and a secondary element;

said elements of said feeder cluster are configured to be interconnected by connections, wherein said connections are mediated by an additional wired communications resource configured to be operated in parallel with said wireless resource;

said primary element of said feeder cluster is configured to receive data transmitted via said wireless resource and to perform a primary decoding process to seek to decode at least one resource block allocated for reception of data by said primary element and thereby generate primary decoded data;

said secondary element of said feeder cluster is configured to receive said data transmitted via said wireless resource and to perform a secondary decoding process to seek to decode said at least one resource block allocated for reception of data by said primary element and thereby generate secondary decoded data;

said secondary element is configured to transmit information derived from said secondary decoded data from said secondary element to said primary element via said additional wired communications resource; and

said primary element of said feeder cluster is configured to perform a revised primary decoding process additionally using said information derived from said secondary decoded data received from said secondary element to decode more reliably said at least one resource block allocated for reception of data by said primary element,

wherein said secondary decoding process comprises a linked sequence of decoding stages, wherein said secondary element is configured to store said decoded data from each stage of said linked sequence of decoding stages, and said information derived from said secondary decoded data transmitted from said secondary element to said primary element via said additional wired communications resource comprises decoded data from a selected decoding stage.