Link adaptation in coordinated multipoint system

• US 9,398,559 B2
• Filed: 03/29/2012
• Issued: 07/19/2016
• Est. Priority Date: 11/04/2011
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Intel Corporation
• Inventors: Davydov, Alexei Vladimirovich, Morozov, Gregory Vladimirovich, Maltsev, Alexander Alexandrovich, Bolotin, Ilya Alexandrovich, Sergeyev, Vadim Sergeyevich
• Primary Examiner(s): Elallam, Ahmed
• Application Number:
  US13/976,370
• Publication Number:
  US 20130336269A1
• Time in Patent Office: 1,573 Days
• US Class Current: 1/1
• CPC Class Codes: H04B 7/024 Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
• CPC Class Codes: H04B 7/0456 Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04J 11/00 Orthogonal multiplex systems, e.g. using WALSH codesH04J13/00 takes precedence
• CPC Class Codes: H04J 3/12 Arrangements providing for calling or supervisory signals
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0077 Cooperative coding
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• 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 27/2662 Symbol synchronisation
• CPC Class Codes: H04L 27/2675 Pilot or known symbols
• CPC Class Codes: H04L 5/0035 Resource allocation in a cooperative multipoint environment
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04L 5/0078 Timing of allocation
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 4/06 Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
• CPC Class Codes: H04W 4/70 Services for machine-to-machine communication [M2M] or machine type communication [MTC]
• CPC Class Codes: H04W 52/0206 in access points, e.g. base stations access point devices per se H04W88/08
• CPC Class Codes: H04W 52/146 : Uplink power control
• CPC Class Codes: H04W 52/242 : taking into account path loss
• CPC Class Codes: H04W 52/244 : Interferences in heterogeneous networks, e.g. among macro and femto or pico cells or other sector / system interference [OSI]
• CPC Class Codes: H04W 52/34 : TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
• CPC Class Codes: H04W 56/0015 : one node acting as a reference for the others
• CPC Class Codes: H04W 68/02 : Arrangements for increasing efficiency of notification or paging channel
• CPC Class Codes: H04W 72/02 : Selection of wireless resources by user or terminal
• CPC Class Codes: H04W 72/0446 : Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/12 : Wireless traffic scheduling
• CPC Class Codes: H04W 72/21 : in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/23 : in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 72/542 : using measured or perceived quality
• CPC Class Codes: H04W 76/11 : Allocation or use of connection identifiers
• CPC Class Codes: H04W 76/40 : for selective distribution or broadcast
• CPC Class Codes: H04W 84/14 : WLL [Wireless Local Loop]; RLL [Radio Local Loop]
• CPC Class Codes: H04W 88/02 : Terminal devices
• CPC Class Codes: H04W 88/08 : Access point devices
• CPC Class Codes: Y02D 30/70 : in wireless communication networks

Abstract

Embodiments of the present disclosure describe devices, methods, computer-readable media and systems configurations for link adaptation within coordinated multipoint systems. In various embodiments, a mobile terminal may determine link adaptation feedback information and feed back the information to a base station. The base station may adjust a channel quality indicator of the link adaptation feedback information based on loading of nodes within a coordinated multipoint measurement set. Other embodiments may be described and/or claimed.

Claims

1. An apparatus comprising:

a channel interference module, at least partially implemented in hardware, to;

receive, from a user equipment (UE), reference signal receive power (RSRP) information associated with a cooperating node of a coordinated multipoint (CoMP) measurement set, the cooperating node to coordinate with a serving node of the CoMP measurement set to facilitate wireless communication with the UE;

receive, from the UE, a channel quality indicator (CQI); and

determine an adjusted CQI based on the RSRP information and the CQI; and

a link adaptation module, at least partially implemented in hardware, to adapt transmission parameters of a communication link associated with the cooperating node or the serving node based on the adjusted CQI.

2. The apparatus of claim 1, wherein the channel interference module is to:

receive, from the UE, a received signal strength indicator (RSSI) that indicates a measured signal power of a muted resource of a sector of the serving node; and

determine the adjusted CQI based further on the RSSI.

3. The apparatus of claim 1, wherein the CQI and the communication link are associated with the cooperating node.

4. The apparatus of claim 3, wherein the cooperating node is a first cooperating node of the CoMP measurement set, and the link adaptation module is to further adapt transmission parameters of a communication link associated with a second cooperating node of the CoMP measurement set based on the adjusted CQI.

5. The apparatus of claim 1, wherein the CQI and the communication link are associated with the serving node.

6. The apparatus of claim 1, wherein the channel interference module is to receive the RSRP information as part of a radio resource management (RRM) message.

7. The apparatus of claim 1, wherein the channel interference module is to:

receive RSRP information for a plurality of nodes of CoMP measurement set;

determine instantaneous loading of physical downlink shared channel (PDSCH) for the plurality of nodes; and

determine cooperating node interference of the plurality of nodes based on received RSRP information and instantaneous loading.

8. The apparatus of claim 7, wherein the channel interference module is to:

determine total interference power on the PDSCH;

determine correction coefficient based on determined total interference power and cooperating node interference power; and

determine the adjusted CQI based on the CQI and the correction coefficient.

9. The apparatus of claim 7, wherein the plurality of nodes includes all nodes of the CoMP measurement set except for the serving node.

10. The apparatus of claim 7, wherein the channel interference module is to:

receive scheduling reports from one or more schedulers of the CoMP measurement set; and

determine the instantaneous loading based on scheduling reports.

11. The apparatus of claim 10, wherein the one or more schedulers comprise a plurality of schedulers respectively disposed on the plurality of nodes and the channel interference module is to:

receive scheduling reports from the plurality of schedulers via one or more backhaul connections with the plurality of nodes.

12. The apparatus of claim 1, wherein the adjusted CQI is a first adjusted CQI, the CQI is a first CQI associated with the cooperating node and the channel interference module is further configured to:

receive, from the UE, a second CQI associated with the serving node; and

determine a second adjusted CQI based on the RSRP information and the second CQI.

13. The apparatus of claim 12, wherein the channel interference module is to determine the first and second adjusted CQI based on a correction coefficient.

14. The apparatus of claim 1, comprising a base station to operate as the serving node.

15. An apparatus comprising:

a channel measurement module, at least partially implemented in hardware, to;

receive a channel state information reference signal (CSI-RS) transmitted by a cooperating node of a coordinated multipoint (CoMP) measurement set; and

determine a reference signal receive power (RSRP) measurement for the cooperating node based on the CSI-RS; and

a feedback module, at least partially implemented in hardware, to feed back the RSRP measurement to a serving node of the CoMP measurement set as part of a radio resource management (RRM) measurement report.

16. The apparatus of claim 15, wherein CSI-RS is a first CSI-RS and the channel measurement module is to:

determine a first channel quality indicator (CQI) based on the first CSI-RS; and

receive a second CSI-RS, transmitted by the serving node, and determine a second (CQI) based on the second CSI-RS.

17. The apparatus of claim 16, wherein the feedback module is to feed back the first and second CQIs to the serving node.

18. The apparatus of claim 17, wherein the feedback module is to feed back the first and second CQIs separately from the RSRP measurement.

19. The apparatus of claim 15, wherein:

the CSI-RS is to be received over one or more resource elements of a physical downlink shared channel (PDSCH);

the cooperating node is associated with a first sector of the CoMP measurement; and

sectors of the CoMP measurement set other than the first sector are to include muted resources that correspond to the one or more resources elements.

20. The apparatus of claim 15, wherein the apparatus is disposed in a first sector of the CoMP measurement set and the channel measurement module is to:

measure received signal strength on one or more resource elements of a physical downlink shared channel (PDSCH) that are muted in the first sector to determine a received signal strength indicator (RSSI).

21. The apparatus of claim 20, wherein the feedback module is to feed back the RSSI to the serving node.

22. The apparatus of claim 15, comprising a user equipment.

23. One or more non-transitory computer readable media having instructions that, when executed, cause a device to:

determine cooperating node interference power associated with one or more cooperating nodes of a coordinated multipoint (CoMP) measurement set;

determine total interference power on a physical downlink shared channel (PDSCH);

determine a correction coefficient based on the cooperating node interference power and the total interference power; and

determine one or more adjusted channel quality indicators (CQIs) based on the correction coefficient and one or more reported CQIs.

24. The one or more non-transitory computer readable media of claim 23, wherein the instructions further cause the device to:

determine cooperating node interference power based on reference signal receive power (RSRP) report received from a user equipment.

25. The one or more non-transitory computer readable media of claim 24, wherein the instructions further cause the device to:

determine cooperating node interference power based on instantaneous loading of the PDSCH.

26. The one or more non-transitory computer readable media of claim 25, wherein the instructions further cause the device to:

determine instantaneous loading of the PDSCH based on scheduling reports from one or more schedulers.

27. The one or more non-transitory computer readable media of claim 23, wherein the one or more CQIs include a first CQI associated with a serving node of the CoMP measurement set and a second CQI associated with a cooperating node of the CoMP measurement set.