METHOD TO IMPROVE THE PERFORMANCE IN CELL RANGE EXPANSION USING LOCATION BASED CODEBOOK SUBSET RESTRICTION

• US 20160353290A1
• Filed: 05/27/2015
• Published: 12/01/2016
• Est. Priority Date: 05/27/2015
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Cismasu, Marius, Nammi, Sairamesh, Gransson, Bo
• Granted Patent: US 9,615,263 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04B 7/0478 Special codebook structures directed to feedback optimisation
• CPC Class Codes: H04B 7/0482 Adaptive codebooks
• CPC Class Codes: H04B 7/0658 Feedback reduction
• CPC Class Codes: H04L 5/0073 Allocation arrangements that take into account other cell interferences for intercell interference mitigation or co-ordination in orthogonal multiplex systems H04J11/005
• CPC Class Codes: H04W 16/26 Cell enhancers or enhancement, e.g. for tunnels, building shadow
• CPC Class Codes: H04W 16/32 Hierarchical cell structures
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 4/021 Services related to particular areas, e.g. point of interest [POI] services, venue services or geofences
• CPC Class Codes: H04W 64/003 locating network equipment
• CPC Class Codes: H04W 84/042 Public Land Mobile systems, e.g. cellular systems
• CPC Class Codes: H04W 88/08 Access point devices
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Systems and methods are disclosed for providing location-based codebook subset restriction. In some embodiments, location-based codebook subset restriction is provided in such a manner as to mitigate co-channel interference from a macro base station to User Equipment devices (UEs) in a cell range expansion zone of a Low Power Node (LPN) within a coverage area of the macro base station. In this manner, performance of the UEs in the cell range expansion zone is improved.

Claims

1. A method of operation of a network node in a cellular communications network, comprising:

determining a codebook subset restriction for a wireless device based on a location of the wireless device within a serving cell of the wireless device; and

sending an indication of the codebook subset restriction to the wireless device.

2. The method of claim 1 wherein determining the codebook subset restriction for the wireless device based on the location of the wireless device within the serving cell of the wireless device comprises:

determining whether the wireless device is a cell edge wireless device based on the location of the wireless device within the serving cell of the wireless device; and

if the wireless device is a cell edge wireless device, selecting the codebook subset restriction such that the codebook subset restriction mitigates co-channel interference to other wireless devices.

3. The method of claim 2 wherein:

the other wireless devices to which the codebook subset restriction mitigates co-channel interference comprise wireless devices in a cell range expansion area of a low power node.

4. The method of claim 3 wherein the other wireless devices to which the codebook subset restriction mitigates co-channel interference further comprise cell edge wireless devices.

5. The method of claim 2 wherein determining the codebook subset restriction for the wireless device based on the location of the wireless device within the serving cell of the wireless device further comprises using no codebook subset restriction if the wireless device is not a cell edge wireless device.

6. The method of claim 2 wherein the codebook subset restriction that mitigates co-channel interference to other wireless devices is dynamic.

7. The method of claim 2 wherein selecting the codebook subset restriction that mitigates co-channel interference to other wireless devices as the codebook subset restriction for the wireless device comprises selecting the codebook subset restriction that mitigates co-channel interference to other wireless devices based on one or more dynamic criteria.

8. The method of claim 7 wherein the one or more dynamic criteria comprise at least one of a group consisting of:

which transmit antennas are active for downlink transmission in the serving cell of the wireless device and the location of the wireless device within the serving cell of the wireless device.

9. The method of claim 1 further comprising determining the location of the wireless device within the serving cell of the wireless device based on at least one of a group consisting of:

measurements from a positioning system, one or more Channel Quality Information, CQI, reports from the wireless device, one or more mobility measurement reports from the wireless device, and a size of a neighbor cell list for the wireless device.

10. The method of claim 1 wherein the cellular communications network is a Long Term Evolution, LTE, network.

11. The method of claim 1 wherein the cellular communications network is a High Speed Packet Access, HSPA, network.

12. The method of claim 1 wherein the network node is a base station controlling the serving cell of the wireless device.

13. A network node for operation in a cellular communications network, comprising:

one or more processors; and

memory containing instructions executable by the one or more processors whereby the network node is operative to;

determine a codebook subset restriction for a wireless device based on a location of the wireless device within a serving cell of the wireless device; and

send an indication of the codebook subset restriction to the wireless device.

14. The network node of claim 13 wherein, in order to determine the codebook subset restriction for the wireless device based on the location of the wireless device within the serving cell of the wireless device, the network node is operative to:

determine whether the wireless device is a cell edge wireless device based on the location of the wireless device within the serving cell of the wireless device; and

if the wireless device is a cell edge wireless device, select the codebook subset restriction such that the codebook subset restriction mitigates co-channel interference to other wireless devices.

15. The network node of claim 14 wherein:

the other wireless devices to which the codebook subset restriction mitigates co-channel interference comprise wireless devices in a cell range expansion area of a low power node.

16. The network node of claim 15 wherein the other wireless devices to which the codebook subset restriction mitigates co-channel interference further comprise cell edge wireless devices.

17. The network node of claim 14 wherein, in order to determine the codebook subset restriction for the wireless device based on the location of the wireless device within the serving cell of the wireless device, the network node is further operative to use no codebook subset restriction if the wireless device is not a cell edge wireless device.

18. The network node of claim 14 wherein the codebook subset restriction that mitigates co-channel interference to other wireless devices is dynamic.

19. The network node of claim 14 wherein the wireless device selects the codebook subset restriction that mitigates co-channel interference to other wireless devices based on one or more dynamic criteria.

20. The network node of claim 19 wherein the one or more dynamic criteria comprise at least one of a group consisting of:

which transmit antennas are active for downlink transmission in the serving cell of the wireless device and the location of the wireless device within the serving cell of the wireless device.

21. The network node of claim 13 wherein the cellular communications network is one of a group consisting of:

a Long Term Evolution, LTE, network and a High Speed Packet Access, HSPA, network.

22. The network node of claim 13 wherein the network node is a base station controlling the serving cell of the wireless device.