Enhanced receiver configuration adaptive to cyclic prefix configuration

• US 9,331,827 B2
• Filed: 05/14/2013
• Issued: 05/03/2016
• Est. Priority Date: 05/14/2012
• Status: Expired due to Fees

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Siomina, Iana, Kazmi, Muhammad
• Primary Examiner(s): PHU, PHUONG M
• Application Number:
  US14/400,659
• Publication Number:
  US 20150131749A1
• Time in Patent Office: 1,085 Days
• Field of Search: 375/346, 375/260, 455/67.13, 455/456.1, 370/67.13
• US Class Current: 1/1
• CPC Class Codes: H04J 11/005 of intercell interference
• CPC Class Codes: H04L 27/2605 Symbol extensions, e.g. Zero Tail, Unique Word [UW]
• CPC Class Codes: H04L 27/2607 Cyclic extensions
• CPC Class Codes: H04L 27/2646 using feedback from receiver for adjusting OFDM transmission parameters, e.g. transmission timing or guard interval length
• CPC Class Codes: H04L 27/2647 Arrangements specific to the receiver only equalisation H04L27/01
• CPC Class Codes: H04L 27/2666 Acquisition of further OFDM parameters, e.g. bandwidth, subcarrier spacing, or guard interval length
• CPC Class Codes: H04L 5/0032 Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation

Abstract

A method in a first radio node is described for adapting a receiver type in the first radio node. The first radio node includes a first and a second receiver types. The first radio node is included in a wireless communications network, which further includes a second radio node and at least one third radio node. The method includes determining a Cyclic Prefix, CP, length of at least one radio signal transmitted by the second radio node, and a CP length of at least one radio signal transmitted by the at least one third radio node. The first node then adapts, the receiver type to be one of the first type and the second types. This is done based on a relation between the CP length of the radio signal transmitted by the second radio node, and the CP length of the radio signal transmitted by the third radio node.

Claims

1. A method in a first radio node for adapting a receiver type in the first radio node, the first radio node comprising a first receiver type and a second receiver type, the two receiver types being different, and the first radio node being comprised in a wireless communications network, the wireless communications network further comprising a second radio node and at least one third radio node, the method comprising:

determining a Cyclic Prefix, CP, length of at least one radio signal transmitted by the second radio node, and a CP length of at least one radio signal transmitted by the at least one third radio node; and

adapting in the first radio node, the receiver type to be one of the first receiver type and the second receiver type, based on a relation between the CP length of the radio signal transmitted by the second radio node and the CP length of the radio signal transmitted by the third radio node,

wherein the first radio node is unaware of the CP length of the at least one radio signal transmitted by the at least one third radio node when the first radio node receives the at least one radio signal from the second radio node,

wherein the first receiver type is a first type of enhanced receiver of the first radio node configured to utilize a first technique for mitigating interference of the wireless communication network, and

wherein the second receiver type is a second type of enhanced receiver of the first radio node configured to utilize a second technique, different from the first technique, for mitigating interference of the wireless communication network.

2. The method of claim 1, wherein the adapting is performed when the first radio node receives signals from the second radio node, wherein the signals are interfered by the at least one third radio node.

3. The method according to claim 1, wherein the at least one third radio node comprises an aggressor node that has not been searched and identified by the first radio node, wherein the determining the CP length of the at least one radio signal transmitted by the at least one third radio node is based on at least one of:

received information on the CP length of the at least one radio signal transmitted by the at least one third radio node, radio characteristics of the at least one third radio node, and radio measurements.

4. The method according to claim 1, wherein the first receiver type is not capable of mitigating interference caused by the at least one third radio node or is capable of mitigating the interference, provided the interference from the at least one third radio node is below a threshold, and the second receiver type is capable of mitigating interference caused by the at least one third radio node.

5. The method according to claim 1, further comprising:

selecting the second receiver type responsive to a determination that the CP length of the at least one radio signal transmitted by the at least one third radio node is smaller than the CI length of the at least one radio signal transmitted by the second radio node; and

selecting the second receiver type responsive to a determination that the CP length of the at least one radio signal transmitted by the at least one third radio node and the CP length of the at least one radio signal transmitted by the second radio node are the same.

6. The method according to claim 1, the method further comprising signalling to a node comprised in the wireless communications network, the node being different from the first radio node, at least one of:

information related to the determined CP length of the at least one radio signal transmitted by one of;

the at least one third radio node and the second radio node, and

a capability of the first radio node for adapting the receiver type depending on the CP length of the at least one radio signal transmitted by the second radio node and the CP length of the at least one radio signal transmitted by the at least one third radio node.

7. The method of claim 6, wherein the node is a positioning node.

8. The method of claim 2, wherein the signals from the second radio node are interfered by the at least one third radio node, and wherein the adapting is further based on at least one of:

type of the signals, whether the second radio node and the at least one third radio node are associated with serving cells of the first radio node, bandwidth of one of;

the second radio node and the third radio node, Multicast-Broadcast Single Frequency Network configuration of one of the second radio node and the at least one third radio node, measurement pattern for measurements in the second radio node, transmit pattern for one or more signals/channels transmitted in the at least one third radio node, pattern for short-range communication, low-activity state, level of synchronization between the second radio node and the at least one third radio node, interference conditions, and one of radio conditions and radio characteristics of the at least one third radio node.

9. The method of claim 1, wherein transmissions by the second radio node and transmissions by the at least one third radio node comprise a multi-leg transmission, wherein the multi-leg transmission comprises transmissions from multiple serving cells or radio links.

19. The method according to claim 4, wherein the radio signals transmitted by the second and third radio nodes do not overlap over a subset of frequency resources.

20. The method according to claim 19, wherein the second receiver type comprises one of a puncturing receiver and an inter-cell interference cancellation receiver having a higher power consumption than the first receiver type.

10. A first radio node for adapting a receiver type in the first radio node, the first radio node comprising a first receiver type and a second receiver typo, the two receiver types being different, and the first radio node being adapted to be comprised in a wireless communications network, the wireless communications network further being adapted to comprise a second radio node and at least one third radio node, the first radio node comprising:

a determining circuit configured to determine a Cyclic Prefix, CP, length of at least one radio signal to be transmitted by the second radio node, and a CP length of at least one radio signal to be transmitted by the at least one third radio node; and

an adapting circuit configured to adapt in the first radio node, the receiver type to be one of the first receiver type and the second receiver type, based on a relation between the CP length of the radio signal to be transmitted by the second radio node and the CP length of the radio signal to be transmitted by the third radio node,

wherein the CP length of the at least one radio signal transmitted by the at least one third radio node is not indicated to the first radio node when the first radio node receives the at least one radio signal transmitted by the second radio node,

wherein the first receiver type is a first type of enhanced receiver of the first radio node configured to utilize a first technique for mitigating interference of the wireless communication network, and

wherein the second receiver type is a second type of enhanced receiver of the first radio node configured to utilize a second technique, different from the first technique, for mitigating interference of the wireless communication network.

11. The first radio node of claim 10, wherein the adapting circuit is configured to adapt when the first radio node receives signals from the second radio node, wherein the signals are interfered by the at least one third radio node.

12. The first radio node of claim 10, wherein the at least one third radio node comprises an aggressor node that has not been searched and identified by the first radio node, and wherein the determining circuit is configured to determine based on at least one of received information on the CP length of the at least one radio signal to be transmitted by the at least one third radio node, radio characteristics of the at least one third radio node, and radio measurements.

13. The first radio node of claim 10, wherein the first receiver type is not capable of mitigating interference caused by the at least one third radio node or is capable of mitigating the interference, provided the interference from the at least one third radio node is below a threshold, and the second receiver type is capable of mitigating interference caused by the at least one third radio node.

14. The first radio node of claim 10, wherein the adapting circuit is further configured to:

select the second receiver type responsive to a determination that the CP length of the at least one radio signal to be transmitted by the at least one third radio node is smaller than the CP length of the at least one radio signal to be transmitted by the second radio node; and

select the second receiver type responsive to a determination that the CP length of the at least one radio signal to be transmitted by the at least one third radio node and the CP length of the at least one radio signal to be transmitted by the second radio node are the same.

15. The first radio node of claim 10, further comprising a signalling circuit configured to signal to a node adapted to be comprised in the wireless communications network, the node being different from the first radio node, at least one of:

information related to the determined CP length of the at least one radio signal to be transmitted by one of the at least one third radio node and the second radio node, and

a capability of the first radio node for adapting the receiver type depending on the CP length of the at least one radio signal to be transmitted by the second radio node and the CP length of the at least one radio signal to be transmitted by the at least one third radio node.

16. The first radio node of claim 10, wherein the node is a positioning node.

17. The first radio node of claim 11, wherein the adapting circuit is further configured to adapt, when the signals to be transmitted from the second radio node are interfered by the at least one third radio node, based on at least one of;

type of the signals, whether the second radio node and the at least one third radio node are associated with serving cells of the first radio node, bandwidth of one of the second radio node and the third radio node, Multicast-Broadcast Single Frequency Network configuration of one of;

the second radio node and the at least one third radio node, measurement pattern for measurements in the second radio node, transmit pattern for one or more signals/channels to be transmitted in the at least one third radio node, pattern for short-range communication, low-activity state, level of synchronization between the second radio node and the at least one third radio node, interference conditions, and one of radio conditions and radio characteristics of the at least one third radio node.

18. The first radio node of claim 10, wherein transmissions to be transmitted by the second radio node and transmissions to be transmitted by the at least one third radio node comprise a multi-leg transmission, wherein the multi-leg transmission comprises transmissions from multiple serving cells or radio links.