Supported, self-optimizing wireless networks, optimized with respect to energy, mobility, and capacity

• US 9,125,091 B2
• Filed: 01/04/2013
• Issued: 09/01/2015
• Est. Priority Date: 04/13/2012
• Status: Expired due to Fees

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Heo, Youn Hyoung, Zhang, Yujian, Niu, Huaning, Zhu, Yuan, Chatterjee, Debdeep, Fwu, Jong-Kae, Yin, Hujun
• Primary Examiner(s): WILSON, ROBERT W
• Application Number:
  US13/734,380
• Publication Number:
  US 20130272132A1
• Time in Patent Office: 970 Days
• US Class Current: 1/1
• CPC Class Codes: H04L 12/189 in combination with wireless systems selective distribution or broadcast in wireless communication networks H04W4/06
• CPC Class Codes: H04L 5/0001 Arrangements for dividing the transmission path duplexing H04L5/14; multiplexing of different sources on one path H04J
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0037 Inter-user or inter-terminal allocation
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0064 Rate requirement of the data, e.g. scalable bandwidth, data priority
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated
• 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 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 28/02 Traffic management, e.g. flow control or congestion control
• CPC Class Codes: H04W 28/0226 based on location or mobility handoff or reselection H04W36/00; mobile application services making use of the location of users or terminals H04W4/02
• CPC Class Codes: H04W 28/0268 using specific QoS parameters for wireless networks, e.g. QoS class identifier [QCI] or guaranteed bit rate [GBR] negotiating SLA or negotiating QoS H04W28/24
• CPC Class Codes: H04W 36/0016 Hand-off preparation specially adapted for end-to-end data sessions
• CPC Class Codes: H04W 36/08 Reselecting an access point
• 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 72/04 Wireless resource allocation
• CPC Class Codes: H04W 72/20 : Control channels or signalling for resource management
• 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 74/0808 : using carrier sensing, e.g. carrier sense multiple access [CSMA]
• CPC Class Codes: H04W 74/0833 : Random access procedures, e.g. with 4-step access
• CPC Class Codes: H04W 76/10 : Connection setup
• CPC Class Codes: H04W 76/19 : Connection re-establishment
• CPC Class Codes: Y02D 30/70 : in wireless communication networks

Abstract

Technology is discussed for self-optimization approaches within wireless networks to optimize networks for energy efficiency, load capacity, and/or mobility, together with new, supporting channel state measurements and handover techniques. New, Channel State Information-Reference Signals (CSI-RSs) for yet-to-be-configured Cell-IDentifications (Cell-IDs) can be used to determine whether adjacent transmission cells can provide coverage for transmission cells that can be switched off for energy efficiency during formation of a Single Frequency Network (SFN). New approaches are also discussed to facilitate mobility within such a network. The new CSI-RSs and mobility approaches can also be used to split up such a SFN when changing load demands so require. Additionally, such new approaches can be used to create a SFN with a common Cell-ID where high mobility is required, such as near a roadway, and to break it up where high capacity is required, such as during a period of traffic congestion.

Claims

1. A device for balancing mobility overhead and load requirements on a wireless communication system, residing on at least one of an evolved Node B (eNodeB) or an Operation &

Maintenance (O&

M) module located within an Evolved Packet Core (EPC), said device comprising;

a selection module configured to select, for a set of transmission cells, one of a high mobility Cell-IDentification (Cell-ID) configuration and a high load capacity Cell-ID configuration, wherein the selection module is comprised of code that is stored in one or more digital memory devices to be executed by one or more processors or the selection module is implemented in a first hardware circuit; and

a configuration module, in communication with the selection module, wherein the configuration module is comprised of code that is stored in the one or more digital memory devices to be executed by the one or more processors or the configuration module is implemented in a second hardware circuit, and wherein the configuration module is configured to;

configure the set of transmission cells to operate in the high mobility Cell-ID configuration, the high mobility Cell-ID configuration comprising a Single Frequency Network (SFN) with a common Cell-ID to reduce mobility overhead, and

configure the set of transmission cells to operate in the high load capacity configuration, the high load capacity configuration having multiple transmission cells with different cell-IDs, to allow increased spectral efficiency for an increased load.

2. The device of claim 1, further comprising a speed measurement module, wherein the speed measurement module is comprised of code that is stored in the one or more digital memory devices to be executed by the one or more processors or the speed measurement module is implemented in a third hardware circuit, and wherein the speed measurement module is in communication with the selection module, the speed measurement module configured to:

perform at least one speed measurement for a set of User Equipments (UEs) within the selected coverage area for the set of transmission cells; and

communicate the at least one speed measurement to the selection module.

3. The device of claim 2, wherein the selection module uses at least one of the at least one speed measurement and load information to select, for the set of transmission cells, one of the high mobility Cell-ID configuration and the high load capacity Cell-ID configuration.

4. The device of claim 3, wherein the selection module selects, for the set of transmission cells, one of the high mobility Cell-ID configuration and the high load capacity Cell-ID configuration based on a combined value relative to a configuration threshold wherein:

the combined value includes weighted speed values and weighted load values;

higher weighted speed values push the combined value toward values relative to the configuration threshold indicative of the high mobility Cell-ID configuration; and

higher weighted load values push the combined value toward values relative to the configuration threshold indicative of the high load capacity Cell-ID configuration.

5. The device of claim 1, wherein a selected coverage area for the set of transmission cells spans a length of a thoroughfare designated for at least one of vehicular traffic and railway traffic.

6. The device of claim 1, wherein the selection module uses at least one of time of day information, day of week information, holiday information, and event information to select one of the high mobility Cell-ID configuration and the high load capacity Cell-ID configuration.

7. The device of claim 1, further comprising a formation module, wherein the formation module is comprised of code that is stored in the one or more digital memory devices to be executed by the one or more processors or the formation module is implemented in a third hardware circuit, and wherein the formation module is configured to:

receive at least one of load information and at least one speed measurement from multiple transmission cells; and

compile the set of transmission cells by including a given transmission cell in the set of transmission cells where the given transmission cell is adjacent to a transmission cell already included in the set of transmission cells and at least one of load information and the at least one speed measurement has a corresponding set of values within a value range predefined for the set of transmission cells.

8. The device of claim 1, further comprising a measurement module, wherein the measurement module is comprised of code that is stored in the one or more digital memory devices to be executed by the one or more processors or the measurement module is implemented in a third hardware circuit, and wherein the measurement module is configured to:

send a set of Channel State Information-Reference Signals (CSI-RSs) for yet-to-be-configured Cell-IDs to a plurality of User Equipments (UE) within a selected coverage area of the set of transmission cells; and

receive a set of measurements from the plurality of UEs based on the set of CSI-RSs, the set of measurements to be used to assist in handover of the plurality of UEs where the selection module changes a selection from a high mobility Cell-ID configuration to a high load capacity Cell-ID configuration.

9. At least one non-transitory machine readable storage medium storing instructions which when executed by a processor perform the following:

receiving, at an evolved Node B (eNodeB) in a Packet Core Network, load information for a set of transmission cells within a selected coverage area;

selecting a reduced set of transmission cells in a Radio Access Network (RAN) operable to provide coverage to the selected coverage area based on the load information; and

reconfiguring the reduced set of transmission cells in the RAN into a Single Frequency Network (SFN) with a common Cell IDentification (Cell-ID) to extend a coverage area of the reduced set of transmission cells to cover the selected coverage area with fewer transmission cells.

10. The at least one non-transitory machine readable storage medium of claim 9, further comprising instructions which when executed by the processor perform the following:

sending a Channel State Information-Reference Signal (CSI-RS) for a yet-to-be-configured common Cell-ID to a plurality of User Equipments (UEs) within the selected coverage area;

receiving a set of measurements from the plurality of UEs based on the CSI-RS; and

using the set of measurements to select the reduced set of transmission cells and to determine that the reduced set of transmission cells will maintain coverage for the selected coverage area after being configured with the common Cell-ID.

11. The at least one non-transitory machine readable storage medium of claim 9, further comprising instructions which when executed by the processor perform the following:

first compiling the set of transmission cells by including adjacent transmission cells with a light traffic load in the set of transmission cells.

12. The at least one non-transitory machine readable storage medium of claim 9, wherein the load information is acquired from one of at least one of an S1 transport network layer load and at least one Relative Narrowband Transmission Power (RNTP) message, the RNTP message communicated via an X2 connection between transmission cells.

13. The at least one non-transitory machine readable storage medium of claim 9, further comprising instructions which when executed by the processor perform the following:

adjusting antenna tilting to optimize coverage for a resultant coverage scenario arising after reconfiguring the remaining set of transmission cells into the SFN with the common Cell-ID.

14. The at least one non-transitory machine readable storage medium of claim 9, further comprising instructions which when executed by the processor perform the following:

determining, based on the load information, that at least one additional transmission cell would improve handling of an increased traffic load within the selected coverage area by increasing spectral efficiency for the increased traffic load;

reconfiguring the at least one additional transmission cell with at least one new Cell-ID;

performing a reassignment for at least one UE to the at least one additional transmission cell.

15. The at least one non-transitory machine readable storage medium of claim 14, further comprising instructions which when executed by the processor perform the following:

requesting at least one CSI-RS based measurement to determine the at least one additional transmission cell, where a CSI-RS for the at least one CSI-RS based measurement carries information that can be correlated to a yet-to-be configured Cell-ID; and

requesting at least one CSI-RS based measurement after the at least one additional transmission cell has been reconfigured with at least one new Cell-ID to provide channel information for the at least one new Cell-ID.

16. A method for implementing Channel State Information-Reference Signals (CSI-RSs) for yet-to-be-configured Cell-IDentifications (Cell-IDs), said method comprising:

providing, to a set of User Equipments (UEs), identification information for a CSI-RS for a yet-to-be-configured Cell-ID to be shared by a set of transmission cells, using one or more processors of an evolved node B (eNodeB);

embedding the CSI-RS with the identification information to allow a measurement of the CSI-RS by at least one UE from the set of UEs to be identified with the yet-to-be-configured Cell-ID and the set of transmission cells, using the one or more processors of the eNodeB; and

performing a reconfiguration action on the set of transmission cells based on the measurement, using the one or more processors of the eNodeB.

17. The method of claim 16, wherein performing the reconfiguration action further comprises:

receiving measurements from the set of UEs; and

estimating a potential coverage area, based on the set of measurements, for a potential new Single Frequency Network (SFN) with a common Cell-ID, where at least a subset of the set of transmission cells has been designated for the potential new SFN.

18. The method of claim 16, wherein performing the reconfiguration action further comprises:

receiving measurements from the set of UEs; and

determining, based on the measurements, at least one target transmission cell within the set of transmission cells for at least one new Cell-ID.

19. The method of claim 16, wherein embedding the CSI-RS with the identification information further comprises:

assigning an identification value to the yet-to-be-configured Cell-ID; and

replacing a Cell-ID value with the identification value to generate a pseudo random sequence for the CSI-RS that can identify the yet-to-be-configured Cell-ID.

20. The method of claim 16, wherein the identification information is embedded in an initializing portion of the CSI-RS.

21. The method of claim 16, wherein providing a set of UEs with identification information further comprises broadcasting the identification information via Remote Radio Control (RRC) broadcasting to a geographic area covered by the yet-to-be-configured Cell-ID.

22. An evolved Node B (eNodeB) operable to connect User Equipments (UEs) to a set of transmission cells to be reconfigured with a new Cell-IDentification (Cell-ID), said eNodeB comprising:

first circuitry configured to select a set of transmission cells to reconfigure to share a new Cell-ID; and

second circuitry configured to send a reconfiguration message to a plurality of UEs associated with the set of transmission cells to reduce overhead used by the plurality of UEs to connect to the set of transmission cells when the set of transmissions cells are reconfigured with the new Cell-ID, the reconfiguration message carrying information to allow the plurality of UEs to connect to the set of transmission cells with the new Cell-ID by one of a process without a handover procedure and a process of a group handover procedure.

23. The eNodeB of claim 22, wherein the reconfiguration message comprises:

an indication for the plurality of UEs to stop transmission;

a value of the new Cell-ID; and

a corresponding time when the new Cell-ID will be operational,

to enable the plurality of UEs receiving the reconfiguration message to stop receiving and transmitting data until a time when the new Cell-ID is operational and it is possible for the plurality of UEs to reconnect to the set of transmission cells with the new Cell-ID.

24. The eNodeB of claim 22, wherein the reconfiguration message comprises a common handover command message sent to the plurality of UEs via multicast signaling, the common handover command providing parameters that are used to perform a handover for the plurality of UEs to the reconfigured set of transmission cells with the new Cell-ID.

25. The eNodeB of claim 24, wherein the second circuitry is further configured to send a different handover command to specify a handover delay for the plurality of UEs associated with the set of transmission cells.

26. The eNodeB of claim 24, wherein the same handover command message comprises at least one Cell-Radio Network Temporary Identifier (C-RNTI) and at least one target transmission cell security algorithm identifier.

27. The eNodeB of claim 24, wherein the common handover command message comprises at least one of a dedicated Radio Access CHannel (RACH) and target eNodeB system information.

28. The eNodeB of claim 22, wherein the second circuitry is further configured to provide a notification message to at least one neighbor transmission cell adjacent to a reconfigured transmission cell within the set of transmission cells, the notification message comprising:

an original Cell-ID;

a reconfigured Cell-ID; and

information about when the reconfigured Cell-ID will be operable for the reconfigured transmission cell.

29. The eNodeB of claim 22, wherein the reconfiguration message indicates a time when the common Cell-ID will be operational is in a next System Information Block (SIB) modification period.