WO2014161840A1 - Comparaison de mesures de signaux de canal de liaison montante à partir d'un nœud de petite cellule et d'un nœud de grande cellule - Google Patents

Comparaison de mesures de signaux de canal de liaison montante à partir d'un nœud de petite cellule et d'un nœud de grande cellule Download PDF

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Publication number
WO2014161840A1
WO2014161840A1 PCT/EP2014/056503 EP2014056503W WO2014161840A1 WO 2014161840 A1 WO2014161840 A1 WO 2014161840A1 EP 2014056503 W EP2014056503 W EP 2014056503W WO 2014161840 A1 WO2014161840 A1 WO 2014161840A1
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Prior art keywords
cell node
uplink channel
large cell
channel signal
small cell
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PCT/EP2014/056503
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English (en)
Inventor
Amaanat ALI
Marcin RYBAKOWSKI
Michal PANEK
Karri Markus Ranta-Aho
Hans Thomas Hoehne
Ali YAVER
Seppo Olavi Hamalainen
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Nokia Solutions And Networks Oy
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Publication of WO2014161840A1 publication Critical patent/WO2014161840A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic

Definitions

  • a communication system can be seen as a facility that enables communication sessions between two or more nodes such as fixed or mobile devices, machine-type terminals, access nodes such as base stations, servers and so on.
  • a communication system and compatible communicating entities typically operate in accordance with a given standard or specification which sets out what the various entities associated with the system are permitted to do and how that should be achieved.
  • the standards, specifications and related protocols can define the manner how devices shall communicate, how various aspects of communications shall be implemented and how devices for use in the system shall be configured.
  • a user can access the communication system by means of an appropriate communication device.
  • a communication device of a user is often referred to as user equipment (UE) or terminal.
  • UE user equipment
  • a communication device is provided with an appropriate signal receiving and transmitting arrangement for enabling communications with other parties.
  • a device such as a user equipment is used for enabling receiving and transmission of communications such as speech and content data.
  • Wireless systems include public land mobile networks (PLMN) such as cellular networks, satellite based communication systems and different wireless local networks, for example wireless local area networks (WLAN).
  • PLMN public land mobile networks
  • WLAN wireless local area networks
  • a communication device provides a transceiver station that can communicate with another communication device such as e.g. a base station of an access network and/or another user equipment.
  • the two directions of communications between a base station and communication devices of users have been conventionally referred to as downlink and uplink.
  • Downlink (DL) can be understood as the direction from the base station to the communication device and uplink (UL) the direction from the communication device to the base station.
  • Some systems may have a number of small-cells overlying larger or macro-cells.
  • a method comprising: determining at least one UE operating within a large cell node region; transmitting at least one UE operational parameter associated with the at least one UE to a small cell node; receiving from the small cell node an uplink channel signal measurement; receiving from a large cell node an uplink channel signal measurement; and comparing the uplink channel signal measurements from the small cell node and the large cell node.
  • Determining at least one UE operating within a large cell node region may further comprise determining a location of the at least one UE operating within the large cell node region is proximate the small cell node region.
  • Determining a location of the at least one UE operating within the large cell node region is proximate the small cell node region comprises at least one of: determining the location of the UE relative to the large cell node by round trip time measurement;
  • Determining at least one UE operating within a large cell node region may comprise determining the at least one UE based on at least one large cell node active set list.
  • the method may further comprise generating the at least one large cell node active set list, wherein generating the at least one large cell active set list may comprise at least one of: determining at least one UE operating in at least one cell adjacent to the small cell node; and determining removing from the set of UE within the large cell node cell at least one UE operating in at least one cell distant from the small cell.
  • Comparing the uplink channel signal measurements from the small cell node and the large cell node may comprise: synchronising the uplink channel signal measurements from the small cell node and the large cell node; determining a difference between the uplink channel signal measurements from the small cell node and the large cell node; and comparing the difference between the uplink channel signal measurements from the small cell node and the large cell node and a threshold value.
  • the method may further comprise triggering an interference mitigation operation when the difference between the uplink channel signal measurements from the small cell node and the large cell node is less than a threshold value.
  • Triggering an interference mitigation operation may comprise at least one of: performing a radio resource management (RRM) operation; instructing the UE to perform an inter- frequency handover operation; and instructing the UE to perform an inter-frequency measurement.
  • RRM radio resource management
  • a method comprising: receiving at least one UE operational parameter associated with at least one UE operating within a large cell node region; synchronising to an uplink channel for the at least one UE operating within the large cell node region based on the at least one UE operational parameter; generating an uplink channel signal measurement from the at least one UE; and transmitting the uplink channel signal measurement to a network control entity.
  • the at least one UE operating within a large cell node region may be at least one UE operating in at least one cell adjacent to the small cell node but is a non-serving UE, wherein the at least one UE operational parameter may be a small cell node non-serving UE parameter.
  • Receiving at least one UE operational parameter associated with the at least one UE may comprise receiving at least one of: a large cell uplink scrambling code; a large cell to small cell chip distance; a relative UL timing difference between the large cell and the small cell; a large cell transmission to reception time difference; and a large cell downlink timing values.
  • Generating an uplink channel signal measurement from the at least one UE based on the at least one UE operational parameter may comprise: configuring the small cell node to measure the uplink channel signal from the at least one UE; and measuring the uplink channel signal from the at least one UE.
  • Transmitting the uplink channel signal measurement to a network control entity may comprise: determining a reporting criteria from the network control entity; comparing the uplink channel signal measurement from the at least one UE with the reporting criteria; and transmitting the uplink channel signal measurement to a network control entity when the uplink channel signal from the at least one UE meets the reporting criteria.
  • a method comprising: generating at a large cell node an uplink channel signal measurement from at least one UE operating within a large cell node region and proximate to a small cell node region; and transmitting the uplink channel signal measurement to a network control entity such that the uplink channel signal measurement from the large cell node can be compared with a uplink channel signal measurement from the small cell.
  • the method may further comprise: determining a reporting criteria from the network control entity; comparing the uplink channel signal measurement from the at least one UE with the reporting criteria; and transmitting the uplink channel signal measurement to a network control entity when the uplink channel signal from the at least one UE meets the reporting criteria.
  • an apparatus comprising: means for determining at least one UE operating within a large cell node region; means for transmitting at least one UE operational parameter associated with the at least one UE to a small cell node; means for receiving from the small cell node an uplink channel signal measurement; means for receiving from a large cell node an uplink channel signal measurement; and means for comparing the uplink channel signal measurements from the small cell node and the large cell node.
  • the means for determining at least one UE operating within a large cell node region may further comprise means for determining a location of the at least one UE operating within the large cell node region is proximate the small cell node region.
  • the means for determining a location of the at least one UE operating within the large cell node region is proximate the small cell node region may comprise at least one of: means for determining the location of the UE relative to the large cell node by round trip time measurement; means for determining the location of the UE relative to the large cell node by cell/sector identification; and means for determining the location of the UE by receiving at least one UE determined location estimate.
  • the means for determining at least one UE operating within a large cell node region may comprise means for determining the at least one UE based on at least one large cell node active set list.
  • the apparatus may further comprise means for generating the at least one large cell node active set list, wherein the means for generating the at least one large cell node active set list may comprise at least one of: means for determining at least one UE operating in at least one cell adjacent to the small cell node; and means for determining removing from the set of UE within the large cell node cell at least one UE operating in at least one cell distant from the small cell.
  • the means for transmitting at least one UE operational parameter associated with the at least one UE to a small cell node may comprise the at least one UE operational parameter being a large cell small cell node non-serving UE parameter.
  • the means for transmitting at least one UE operational parameter associated with the at least one UE to a small cell node may comprise means for transmitting to the small cell node at least one of: large cell uplink scrambling code; large cell to small cell chip distance; a relative UL timing difference between the large cell and the small cell; large cell transmission to reception time difference; and large cell downlink timing values.
  • the means for comparing the uplink channel signal measurements from the small cell node and the large cell node may comprise: means for synchronising the uplink channel signal measurements from the small cell node and the large cell node; means for determining a difference between the uplink channel signal measurements from the small cell node and the large cell node; and means for comparing the difference between the uplink channel signal measurements from the small cell node and the large cell node and a threshold value.
  • the apparatus may further comprise means for triggering an interference mitigation operation when the difference between the uplink channel signal measurements from the small cell node and the large cell node is less than a threshold value.
  • the means for triggering an interference mitigation operation may comprise at least one of: means for performing a radio resource management (RRM) operation; means for instructing the UE to perform an inter-frequency handover operation; and means for instructing the UE to perform an inter-frequency measurement.
  • RRM radio resource management
  • an apparatus comprising: means for receiving at least one UE operational parameter associated with at least one UE operating within a large cell node region; means for synchronising to an uplink channel for the at least one UE operating within the large cell node region based on the at least one UE operational parameter; means for generating an uplink channel signal measurement from the at least one UE based on the at least one UE operational parameter; and means for transmitting the uplink channel signal measurement to a network control entity.
  • the at least one UE operating within a large cell node region may be at least one UE operating in at least one cell adjacent to the small cell node but is a non-serving UE, wherein the at least one UE operational parameter may be a small cell node non-serving UE parameter.
  • the means for receiving at least one UE operational parameter associated with the at least one UE comprises means for receiving at least one of: a large cell uplink scrambling code; a large cell to small cell chip distance; a relative UL timing difference between the large cell and the small cell; a large cell transmission to reception time difference; and a large cell downlink timing values.
  • the means for generating an uplink channel signal measurement from the at least one UE based on the at least one UE operational parameter may comprise: means for configuring the small cell node to measure the uplink channel signal from the at least one UE; and means for measuring the uplink channel signal from the at least one UE.
  • the means for transmitting the uplink channel signal measurement to a network control entity may comprise: means for determining a reporting criteria value from the network control entity; means for comparing the uplink channel signal measurement from the at least one UE with the reporting criteria; means for transmitting the uplink channel signal measurement to a network control entity when the uplink channel signal from the at least one UE meets the reporting criteria.
  • an apparatus comprising: means for generating at a large cell node an uplink channel signal measurement from at least one UE operating within a large cell node region and proximate to a small cell node region; and means for transmitting the uplink channel signal measurement to a network control entity such that the uplink channel signal measurement from the large cell node can be compared with a uplink channel signal measurement from the small cell.
  • the apparatus may further comprise: means for determining a reporting criteria from the network control entity; means for comparing the uplink channel signal measurement from the at least one UE with the reporting criteria; means for transmitting the uplink channel signal measurement to a network control entity when the uplink channel signal from the at least one UE meets is greater than the reporting criteria.
  • an apparatus comprising at least one processor and at least one memory including computer code for one or more programs, the at least one memory and the computer code configured to with the at least one processor cause the apparatus to at least: determine at least one UE operating within a large cell node region; means for transmitting at least one UE operational parameter associated with the at least one UE to a small cell node; receive from the small cell node an uplink channel signal measurement; receive from a large cell node an uplink channel signal measurement; and compare the uplink channel signal measurements from the small cell node and the large cell node.
  • Determining at least one UE operating within a large cell node region may cause the apparatus to determine the at least one UE based on at least one large cell node active set list.
  • the apparatus may further be caused to generate the at least one large cell node active set list, wherein generating the at least one large cell node active set list may cause the apparatus to perform at least one of: determine at least one UE operating in at least one cell adjacent to the small cell node; and determine removing from the set of UE within the large cell node cell at least one UE operating in at least one cell distant from the small cell.
  • the at least one UE operational parameter associated with the at least one UE may comprise the at least one UE operational parameter being a large cell small cell node non- serving UE parameter.
  • Transmitting at least one UE operational parameter associated with the at least one UE to a small cell node may cause the apparatus to transmit to the small cell node at least one of: large cell uplink scrambling code; large cell to small cell chip distance; a relative UL timing difference between the large cell and the small cell; large cell transmission to reception time difference; and large cell downlink timing values.
  • Comparing the uplink channel signal measurements from the small cell node and the large cell node may cause the apparatus to: synchronise the uplink channel signal measurements from the small cell node and the large cell node; determine a difference between the uplink channel signal measurements from the small cell node and the large cell node; and compare the difference between the uplink channel signal measurements from the small cell node and the large cell node and a threshold value.
  • the apparatus may further be caused to trigger an interference mitigation operation when the difference between the uplink channel signal measurements from the small cell node and the large cell node is less than a threshold value.
  • Triggering an interference mitigation operation may cause the apparatus to perform at least one of: perform a radio resource management (RRM) operation; instruct the UE to perform an inter-frequency handover operation; and instruct the UE to perform an inter-frequency measurement.
  • RRM radio resource management
  • an apparatus comprising at least one processor and at least one memory including computer code for one or more programs, the at least one memory and the computer code configured to with the at least one processor cause the apparatus to at least: receive at least one UE operational parameter associated with at least one UE operating within a large cell node region; synchronise to an uplink channel for the at least one UE operating within the large cell node region based on the at least one UE operational parameter;
  • the at least one UE operating within a large cell node region may be at least one UE operating in at least one cell adjacent to the small cell node but is a non-serving UE, wherein the at least one UE operational parameter may be a small cell node non-serving UE parameter.
  • Receiving at least one UE operational parameter associated with the at least one UE may cause the apparatus to receive at least one of: a large cell uplink scrambling code; a large cell to small cell chip distance; a relative UL timing difference between the large cell and the small cell; a large cell transmission to reception time difference; and a large cell downlink timing values.
  • Generating an uplink channel signal measurement from the at least one UE based on the at least one UE operational parameter may cause the apparatus to: configure the small cell node to measure the uplink channel signal from the at least one UE; and measure the uplink channel signal from the at least one UE.
  • Transmitting the uplink channel signal measurement to a network control entity may cause the apparatus to: determine a reporting criteria value from the network control entity; compare the uplink channel signal measurement from the at least one UE with the reporting criteria; and transmit the uplink channel signal measurement to a network control entity when the uplink channel signal from the at least one UE meets the reporting criteria.
  • an apparatus comprising at least one processor and at least one memory including computer code for one or more programs, the at least one memory and the computer code configured to with the at least one processor cause the apparatus to at least: generate at a large cell node an uplink channel signal measurement from at least one UE operating within a large cell node region and proximate to a small cell node region; and transmit the uplink channel signal measurement to a network control entity such that the uplink channel signal measurement from the large cell node can be compared with a uplink channel signal measurement from the small cell.
  • the apparatus may further be caused to: determine a reporting criteria from the network control entity; compare the uplink channel signal measurement from the at least one UE with the reporting criteria; and transmit the uplink channel signal measurement to a network control entity when the uplink channel signal from the at least one UE meets is greater than the reporting criteria.
  • an apparatus comprising: a user equipment determiner configured to determine at least one UE operating within a large cell node region; a transmitter configured to transmit at least one UE operational parameter associated with the at least one UE to a small cell node; a receiver configured to receive from the small cell node an uplink channel signal measurement; the receiver further configured to receive from a large cell node an uplink channel signal measurement; and a comparator configured to compare the uplink channel signal measurements from the small cell node and the large cell node.
  • the user equipment determiner may further comprise a user equipment locator configured to determine a location of the at least one UE operating within the large cell node region is proximate the small cell node region.
  • the user equipment locator configured to determining a location of the at least one UE operating within the large cell node region is proximate the small cell node region may comprise at least one of: a round trip locator configured to determine the location of the UE relative to the large cell node by round trip time measurement; a cell identification determiner configured to determine the location of the UE relative to the large cell node by cell/sector identification; and a location estimate receiver configured to determine the location of the UE by receiving at least one UE determined location estimate.
  • the user equipment locator configured to determine at least one UE operating within a large cell node region may be configured to determine the at least one UE based on at least one large cell node active set list.
  • the apparatus may further comprise a large cell node list generator configured to generate the at least one large cell node active set list, wherein the large cell node list generator may comprise at least one of: a neighbour cell identifier configured to determine at least one UE operating in at least one cell adjacent to the small cell node; and a remote cell determiner configured to remove from the set of UE within the large cell node cell at least one UE operating in at least one cell distant from the small cell.
  • a neighbour cell identifier configured to determine at least one UE operating in at least one cell adjacent to the small cell node
  • a remote cell determiner configured to remove from the set of UE within the large cell node cell at least one UE operating in at least one cell distant from the small cell.
  • the at least one UE operational parameter associated with the at least one UE may comprise the at least one UE operational parameter being a large cell small cell node non- serving UE parameter.
  • the transmitter may be configured to transmit to the small cell node at least one of: large cell uplink scrambling code; large cell to small cell chip distance; a relative UL timing difference between the large cell and the small cell; large cell transmission to reception time difference; and large cell downlink timing values.
  • the comparator may be configured to: synchronise the uplink channel signal measurements from the small cell node and the large cell node; determine a difference between the uplink channel signal measurements from the small cell node and the large cell node; and compare the difference between the uplink channel signal measurements from the small cell node and the large cell node and a threshold value.
  • the apparatus may further comprise an interference mitigation trigger configured to trigger an interference mitigation operation when the difference between the uplink channel signal measurements from the small cell node and the large cell node is less than a threshold value.
  • the interference mitigation trigger may be configured to perform at least one of: initiate a radio resource management (RRM) operation; instruct the UE to perform an inter-frequency handover operation; and instruct the UE to perform an inter-frequency measurement.
  • RRM radio resource management
  • an apparatus comprising: a receiver configured to receive at least one UE operational parameter associated with at least one UE operating within a large cell node region; a uplink synchroniser configured to synchronise to an uplink channel for the at least one UE operating within the large cell node region based on the at least one UE operational parameter;
  • an uplink measurer configured to generate an uplink channel signal measurement from the at least one UE based on the at least one UE operational parameter; and a transmitter configured to transmit the uplink channel signal measurement to a network control entity.
  • the at least one UE operating within a large cell node region may be at least one UE operating in at least one cell adjacent to the small cell node but is a non-serving UE, wherein the at least one UE operational parameter may be a small cell node non-serving UE parameter.
  • the receiver may be configured to receive at least one of: a large cell uplink scrambling code; a large cell to small cell chip distance; a relative UL timing difference between the large cell and the small cell; a large cell transmission to reception time difference; and a large cell downlink timing values.
  • the uplink measurer may be configured to: configure the small cell node to measure the uplink channel signal from the at least one UE; and measure the uplink channel signal from the at least one UE.
  • the transmitter may be configured to: determine a reporting criteria value from the network control entity; compare the uplink channel signal measurement from the at least one UE with the reporting criteria; and transmit the uplink channel signal measurement to the network control entity when the uplink channel signal from the at least one UE meets the reporting criteria.
  • an apparatus comprising: an uplink channel measurer configured to generate at a large cell node an uplink channel signal measurement from at least one UE operating within a large cell node region and proximate to a small cell node region; and a transmitter configured to transmit the uplink channel signal measurement to a network control entity such that the uplink channel signal measurement from the large cell node can be compared with a uplink channel signal measurement from the small cell.
  • the transmitter may further be configured to: determine a reporting criteria from the network control entity; compare the uplink channel signal measurement from the at least one UE with the reporting criteria; and transmit the uplink channel signal measurement to a network control entity when the uplink channel signal from the at least one UE meets is greater than the reporting criteria.
  • a method comprising: determining at least one UE operating within a large cell node region; transmitting at least one UE operational parameter associated with the at least one UE operating within a large cell node region to a small cell node; receiving at the small cell node at least one UE operational parameter associated with at least one UE operating within a large cell node region; synchronising a small cell node to an uplink channel for the at least one UE operating within the large cell node region based on the at least one UE operational parameter; generating at a small cell node an uplink channel signal measurement from the at least one UE; transmitting the uplink channel signal measurement from the small cell node to a network control entity; receiving at the network control entity from the small cell node the uplink channel signal measurement; receiving at the network control entity from a large cell node an uplink channel signal measurement; and comparing the uplink channel signal measurements from the small cell node and the large cell node.
  • a fourteenth aspect there is provided a system comprising: a network controller; at least one large cell node; and at least one small cell node, wherein the network controller is configured to: determine at least one UE operating within a large cell node region; and transmit at least one UE operational parameter associated with the at least one UE operating within the large cell node region to a small cell node, the small cell node is configured to receive the at least one UE operational parameter associated with at least one UE operating within a large cell node region; synchronise to an uplink channel for the at least one UE operating within the large cell node region based on the at least one UE operational parameter; and generate an uplink channel signal measurement from the at least one UE based on the at least one UE operational parameter; and transmit the uplink channel signal measurement to a network controller, the network controller being further configured to receive from the small cell node the uplink channel signal measurement; and further receive from a large cell node an uplink channel signal measurement; and compare the uplink channel signal measurements from the
  • the large cell node may be at least one of: a macro base station; and a node B.
  • the small cell node is a low power node.
  • the uplink channel signal measurement may be at least one of: a signal to interference plus noise (SINR) measurement for the uplink channel; a signal to interference plus noise (SINR) measurement for a Macro UL DPCCH channel.
  • SINR signal to interference plus noise
  • Figure 1 shows a schematic diagram of a communication system comprising a base station and a plurality of communication devices
  • Figure 2 shows a schematic diagram of a mobile communication device according to some embodiments
  • Figure 3 shows a schematic diagram of a base station apparatus according to some embodiments
  • Figure 4 shows a schematic diagram of a control node apparatus according to some embodiments
  • Figure 5 shows a flow diagram showing a method performed according to some embodiments
  • Figure 6 shows a flow diagram showing a further method performed according to some embodiments
  • Figure 7 shows an example HSUPA UPH measurement graph
  • Figure 8 shows schematically an example location reporting example for determining a UE location according to some embodiments
  • Figure 9 shows schematically downlink and uplink propagation delays
  • Figure 10 shows an example flow diagram of the generation of a measurement report according to some embodiments
  • Figure 1 1 shows an example flow diagram of the alignment of the measurement report as generated in Figure 10 according to some embodiments
  • Figure 12 shows an example HetNet Deployment
  • Figure 13 shows example uplink and downlink cell boundaries in the macro and low power mode nodes
  • Figure 14 shows a further example of a HetNet Deployment with multichannel operation
  • Figure 15 shows an example flow diagram of the low power node listening mode of macro node based user equipment uplink operations
  • Figure 16 shows an example flow diagram of an offload decision process with location services enabled according to some embodiments.
  • certain exemplifying embodiments are explained with reference to a wireless or mobile communication system serving mobile communication devices.
  • certain general principles of a wireless communication system and mobile communication devices are briefly explained with reference to Figures 1 to 4 to assist in understanding the technology underlying the described examples.
  • a wireless communication system mobile communication devices or user equipment (UE) 2 are provided wireless access via at least one base station or similar wireless transmitting and/or receiving node or point.
  • UE user equipment
  • Figure 1 an example of two overlapping access systems or radio service areas of a cellular system macro cell A and macro cell B provided by base stations 3a and 3b and two smaller radio service areas provided by an example pico/micro cell base station 7a and a low power node (LPN) base station 7b as shown.
  • Each mobile communication device and base station/RRH may have one or more radio channels open at the same time and may send signals to and/or receive signals from more than one source. It is noted that the radio service area borders or edges are schematically shown for illustration purposes only in Figure 1 .
  • a base station site can provide one or more cells.
  • a base station can also provide a plurality of sectors, for example three radio sectors, each sector providing a cell or a subarea of a cell. All sectors within a cell may be served by the same base station.
  • Base stations are typically controlled by at least one appropriate controller apparatus so as to enable operation thereof and management of mobile communication devices in communication with the base stations.
  • radio network control apparatus 4 is shown to control the respective macro level base stations 3a and 3b.
  • the control apparatus of a base station can be interconnected with other control entities.
  • the control apparatus 4 is typically provided with memory capacity and at least one data processor.
  • the control apparatus and functions may be distributed between a plurality of control units. In some systems, the control apparatus may additionally or alternatively be provided in a radio network controller.
  • base stations 3a and 3b are shown as connected to a wider communications network (CN) 5.
  • a further gateway function may be provided to connect to another network.
  • the pico cell base station 7a and a low power node (LPN) 7b are connected to radio network controller (RNC) 4 via a suitable gateway such as the low power node gateway (LPN-GW) 6 or RNC in case of 3G networks.
  • RNC radio network controller
  • LPN-GW low power node gateway
  • a possible mobile communication device will now be described in more detail with reference to Figure 2 showing a schematic, partially sectioned view of a communication device 2.
  • UE user equipment
  • An appropriate mobile communication device may be provided by any device capable of sending and receiving radio signals.
  • Non-limiting examples include a mobile station (MS) or mobile device such as a mobile phone or what is known as a 'smart phone', a computer provided with a wireless interface card or other wireless interface facility, personal data assistant (PDA) provided with wireless communication capabilities, or any combinations of these or the like.
  • a mobile communication device may provide, for example, communication of data for carrying communications such as voice, electronic mail (email), text message, multimedia and so on. Users may thus be offered and provided numerous services via their communication devices. Non-limiting examples of these services include two-way or multi- way calls, data communication or multimedia services or simply an access to a data communications network system, such as the Internet. Users may also be provided broadcast or multicast data.
  • Non-limiting examples of the content include downloads, television and radio programs, videos, advertisements, various alerts and other information.
  • the mobile device 2 may receive signals over an air interface via appropriate apparatus for receiving and may transmit signals via appropriate apparatus for transmitting radio signals.
  • RF interface or transceiver apparatus is designated schematically by block 205.
  • the RF interface or transceiver apparatus 205 may be provided for example by means of a radio part and associated antenna arrangement.
  • the antenna arrangement may be arranged internally or externally to the mobile device.
  • a wireless communication device can be provided with a Multiple Input / Multiple Output (MIMO) antenna system.
  • MIMO arrangements as such are known. MIMO systems use multiple antennas at the transmitter and receiver along with advanced digital signal processing to improve link quality and capacity.
  • multiple antennas can be provided, for example at base stations and mobile stations, and the RF interface or transceiver apparatus 205 of Figure 2 can provide a plurality of antenna ports. More data can be received and/or sent where there are more antenna elements.
  • a station may comprise an array of multiple antennas. Signalling and muting patterns can be associated with TX antenna numbers or port numbers of MIMO arrangements.
  • a mobile device is typically provided with at least one data processing entity 203, at least one memory 217 and other possible components 209 for use in software and hardware aided execution of tasks it is designed to perform, including control of access to and communications with access systems and other communication devices.
  • the data processing, storage and other relevant control apparatus can be provided on an appropriate circuit board and/or in chipsets. This feature is denoted by reference 219.
  • the user may control the operation of the mobile device by means of a suitable user interface 201 such as key pad, voice commands, touch sensitive screen or pad, combinations thereof or the like.
  • a display, a speaker and a microphone can be also provided a represented by user output interface block 215.
  • a mobile communication device may comprise appropriate connectors (either wired or wireless) to other devices and/or for connecting external accessories, for example hands-free equipment, thereto.
  • Figure 3 shows an example of a base station or node for a communication system, for to be coupled to a radio network controller 4 or gateway and further to communicate with the user equipment 2 and/or for controlling a station of an access system, such as a base station 3, 7.
  • base stations 3, 7 comprise a separate control apparatus.
  • each base station 3, 7 may have such a control apparatus as well as a control apparatus being provided in a radio network controller 4.
  • the base station or node 3, 7 can comprise at least one memory 307, at least one data processing unit 304 and an input/output interface 309.
  • the base station or node can be coupled to a control apparatus such as the radio network controller 4. Furthermore the base station or node 3, 7 can comprise appropriate apparatus for transmitting/receiving radio signals.
  • RF interface or transceiver apparatus is designated schematically by block 303.
  • the RF interface or transceiver apparatus 303 may be provided for example by means of a radio part and associated antenna arrangement 301.
  • the antenna arrangement 301 may be arranged internally or externally to the base station or node.
  • the base station or node such as shown herein can be provided with a Multiple Input / Multiple Output (MIMO) antenna system 301.
  • MIMO Multiple Input / Multiple Output
  • MIMO arrangements as such are known.
  • Ml MO systems use multiple antennas at the transmitter and receiver along with advanced digital signal processing to improve link quality and capacity.
  • control apparatus 109 can be configured to execute an appropriate software code to provide the control functions.
  • Figure 4 shows an example of a control apparatus such as the RNC 4 or gateway such as the LPN GW 6, to be coupled to a suitable base station 3 or LPN 7.
  • the control apparatus can be arranged to provide control on communications in the service area of the system.
  • the control apparatus 4 comprises at least one memory 402, at least one data processing unit 404 and an input/output interface 406. Via the interface the control apparatus can be coupled to a receiver and a transmitter of the base station 3 or LPN 7.
  • the control apparatus 4 or LPN GW 6 can be configured to execute an appropriate software code to provide the control functions.
  • the communication device 2 may access the communication system based on various access techniques, such as code division multiple access (CDMA), or wideband CDMA (WCDMA).
  • CDMA code division multiple access
  • WCDMA wideband CDMA
  • Other non-limiting examples comprise time division multiple access (TDMA), frequency division multiple access (FDMA) and various schemes thereof such as the interleaved frequency division multiple access (I FDMA), single carrier frequency division multiple access (SC-FDMA) and orthogonal frequency division multiple access (OFDMA), space division multiple access (SDMA) and so on.
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • I FDMA interleaved frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SDMA space division multiple access
  • NBs Node Bs
  • RLC/MAC/PHY Radio Link Control/Medium Access Control/Physical layer protocol
  • RRC Radio Resource Control
  • Other examples of radio access system include those provided by base stations of systems that are based on technologies such as wireless local area network (WLAN) and/or WiMax (Worldwide Interoperability for Microwave Access).
  • WLAN wireless local area network
  • WiMax Worldwide Interoperability for Microwave Access
  • other examples of radio access systems include LTE (or LTE-Advanced) deployment of macro enhanced node B (eNBs).
  • W-CDMA Wideband Code Division Multiple Access
  • UMTS Universal Mobile Telecommunications System
  • co-channel cells These can be implemented by low power node B (LPN) or low power BTS and create 'small cells' where 'small cells' are cells located within or overlapping partially 'large cells' in the form of macro cells.. These small cells are also known as micro, pico or femto cells.
  • LPN low power node B
  • the small cells and/or relay stations may be in communication with a macro BTS.
  • One example of such a deployment is a co-channel HetNet (heterogeneous networks) scenario. This may arise where more than one transmitter is using the same channel or frequency.
  • HetNets heterogeneous networks inter-cell interference
  • the Macro BTS 3 has a coverage area 1 101 using a carrier F1 and the LPN 7 has a coverage area 1 103 within the macro cell coverage area 1 101.
  • the LPNs may be deployed on the same macro carrier frequency or a totally different set of frequencies. In other words there can be co-channel deployments and dedicated channel deployments. In the embodiments described herein the example implement co-channel deployments.
  • FIG. 13 shows the macro BTS 3 and the small cell (LPN) 7 up-link (UL) and down-link (DL) coverage boundaries in a co-channel deployment.
  • the up- link coverage boundaries are affected by the macro and small cell receiver noise factors, the noise rise of macro and small cells and the uplink path loss.
  • the down-link coverage boundaries are affected by the macro and small cell transmission power, the cell reselection parameters and the downlink path loss.
  • the macro cell downlink coverage boundary is greater than the macro cell uplink coverage and the small cell downlink coverage boundary is greater than the small cell uplink coverage which causes a UL/DL imbalance.
  • the difference in Macro and LPN P-CPICH powers creates an UL/DL power imbalance problem, which originates from the fact that DL and UL cell boundaries between Macro and LPN as seen from the UE are not balanced.
  • the situation is shown in the Figure 13 where the DL boundary (marked C in Figure 13) 1205 of the LPN is smaller than UE UL boundary 1201 (marked A in Figure 13) and the DL boundary (marked D in Figure 13) 1207 of the macro BTS is smaller than UE UL boundary 1203 (marked B in Figure 13).
  • a UE connected to the macro cell could generate severe UL interference to the LPN (since the UE's UL transmission is power adjusted to meet only Macro requirements).
  • the LPN is unable to react to those interfering conditions since the UE is outside of its influence area (in other words the UE is not within LPN DL coverage area). So, in comparison to a macro only RAN deployment where all cells had the similar UL and DL boundaries where a UE is creating interference with its UL transmission to the other cell, the UE was also in the DL coverage area of the interfered (other) cell (in other words both cells are in active set) which enabled the second cell to act and send "power-down" commands and eventually mitigate this issue. However, in this example as the UL & DL boundaries are not aligned this problem persists.
  • CIO Cell Individual Offset
  • a cell level parameter that allows a UE to report that cell more or less favourably depending on the value sent by network in this parameter, and desensitization helps in balancing LPN DL and UL links
  • these methods have also drawbacks.
  • CIO and desensitization cannot be aligned to have almost ideal link balance for all cases and network parameters, and especially with LPN that have very low maximum DL power (for example 30 and 24 dBm).
  • the UL interference level could be especially high and be a significant part of LPN Noise Rise level when many UEs with high throughput UL services are located in the mentioned zone between boundaries E 1209 and C 1205.
  • LPN Noise Rise due to non-serving Macro UEs could even exceed target Noise Rise of LPN which in effect blocks serving LPN UEs.
  • the concept of the following embodiments is to acquire the UEs UL channels with a goal to detect, measure and report the dedicated channels transmitted by the UE.
  • the acquired UE UL channel information can be used to compare the UE UL towards both the macro and small cell. The comparison can then be used to determine when a threshold is reached then action can be taken to mitigate any possible interference.
  • the comparison of the UE UL towards both the macro and the small cell is compared and determined to have equal SINR towards both the macro and small cell then action can be triggered.
  • the comparison information can be applied to indicate that that the UE is entering or leaving an imbalance zone which could be used by a radio resource management (RRM) entity or algorithm.
  • RRM radio resource management
  • the use of this information enables a UE to be handed- over to a different frequency layer as part of Multi-band load balancing algorithm.
  • entities and methods for triggering the reaction are required before applying any of them.
  • the radio access network is configured to be able to recognize and identify when the point is reached.
  • the RNC provides to the LPN the served by Macro UE UL Scrambling Code and required parameters related to UE UL timing, the LPN synchronizes to the UL link of Macro UE so to acquire the UEs UL channels and enable the LPN to measure a SINR of UL DPCCH channel and the LPN sends the measurements results to RNC.
  • the radio network controller 4 can comprise a UE location or position estimator or suitable means for estimating the UE location or position.
  • the network can be able to roughly estimate the UE position and furthermore to prevent unnecessary signalling and processing only a selection of all of the Macro UEs are monitored.
  • the RNC may limit the list of UEs that the LPN is supposed to measure in UL based on the active set cell list of the UEs. For instance, a UE which has in its active set a cell which is known to be far away from the LPN does not need to be measured by the LPN.
  • the RNC 4 can be configured to transmit to the UE within the range of the Macro BTS a neighbouring cell list (NCL) containing the low power nodes (LPNs) that the UE is to monitor and report.
  • NCL neighbouring cell list
  • LPNs low power nodes
  • the UE 2 can be configured to on determining the NCL the LPNs send the measurements back to the RNC 4 via a RRC Measurement Control message. These reports are sent by the UE based on triggering parameters set by the RNC for the active set of cells for the UEs and in some embodiments additionally determine measurement parameters for a set of cells to be monitored and additionally reported.
  • the measured CPICH Ec/lo of these LPNs can be much lower than -24 dB, the minimum level of CPICH Ec/lo reported by the UE in the RRC measurement control message then the UE can be controlled to reports Neighbour LPN cells with CPICH Ec/lo values below this (in other words before reaching the same UL SINR).
  • the exact value of CPICH Ec/lo is defined before the reporting occurs.
  • the CPICH Ec/lo value before reporting threshold is determined or measure by simulation study and/or practical measurement.
  • the UPH (uplink power headroom) values can be optionally reported by the macro BTS 3 to be passed to the RNC 4.
  • This value can in some embodiments provide an indication of the geometry of the reception boundaries as seen by the UE. (For example for the R99 standard defined channels the RNC relies on periodical Ec/lo measurements only)
  • DCH dedicated transport channel
  • DCH dedicated transport channel
  • the UPH is defined as the ratio of the maximum UE transmission power and the corresponding DPCCH code power).
  • An example of UPH values is shown in Figure 7 which shows the range of reported UPH from low to high as the geometry increases from OdB to 12dB.
  • the location or position estimation can be determined by means other than monitoring the RRC measurement control message information.
  • the location estimate information can be provided by the UE transmitting an exact location reports assisted by GPS or any other suitable beacon based estimation.
  • the macro BTS is configured to further refine the position determination by using an Angle of Arrival estimation on transmissions received by the macro BTS.
  • the RNC can be configured to determine a position or location estimation taking into account the non line of sight (LOS) path distance to arrive further at a precise location.
  • the location reporting can be refined by using round time trip (RTT) reports.
  • RTT measurement as shown in Figure 8 can cover the time of the transmission from the BTS to UE and the time of the reception from the UE to BTS.
  • the measurement can in some embodiments be used to evaluate the distance between UE and BTS.
  • the position or location of the UE can be located to a defined circle (for an omni-cell) or arc (for a sector cell). This in turn can be improved by combining the RTT measurement with an angle of arrival (AoA) estimate.
  • AoA angle of arrival
  • RTT cab be reported in the node B application port (NBAP) from LPN to RNC: DEDICATED MEASUREMENT INITIATION RESPONSE: RoundTripTime, when the Location Request is activated from the core network (CN).
  • NBAP node B application port
  • RESPONSE RoundTripTime
  • the positioning is determined by the Operations and maintenance [or operations and management] (O&M) centre.
  • the low power nodes LPNs measure and report the Load situation to the O&M centre.
  • the low power nodes LPNs can be configured to monitor such parameters as Noise Rise, UE SIR error statistics.
  • the Macro cell BTS can be configured to perform a signalling trace for example by using a suitable network tool for all Macro UEs.
  • the O&M centre estimates if a UE is nearby a LPN.
  • the UE is configured to report the CPICH level from the LPN. The operation of estimating the UE position is shown in Figure 5 by step 401.
  • the RNC uses the CPICH Ec/lo values reported by the UE in Step 401 to determine the subset of small cells that are probable candidates in UL reception range.
  • CPICH Ec/lo value is non line of sight (LOS) distance
  • LOS line of sight
  • the operation of determining at the RNC the LPN cells in the UL reception range of the MUE is shown in Figure 10 by step 903.
  • the RNC can be configured to correlate the received RRC measurement control message information with the other positional or location information as discussed herein to improve the UE selection and to update the LPN list.
  • the operation of selecting the UEs for UL monitoring in the LPN is shown in Figure 5 by step 402.
  • the RNC is configured to determine or collect any UE radio link information required to synchronization with Macro UL DPCCH channel to be used by the LPN for UL monitoring the UE.
  • the parameters include the following:
  • the RNC can be configured to determine or collect the Scrambling Code which is currently use by particular UE in Uplink.
  • the RNC can be configured to determine or collect the difference in chip level between Macro and LPN computed from timing offset used in Macro and LPN. In some embodiments the RNC can be configured to determine or collect the Macro DL Tx received by UE (after some propagation delay say X chips) after adding that
  • the UL Tx of the UE starts exactly after 1024 chips from first path received on DL (DL first path start from frame beginning is offset by XDPCH.n OR XF-DPCH, p )-
  • the UE Tx hence reaches the macro cell somewhere after (1024 + X + Y) chips; Y being the UL propagation delay of the UE UL Tx transmission.
  • the LPN is provided parameters to enable synchronisation with the Macro UE.
  • the LPN can be provided with the UE UL Scrambling code and the value of XDPCH.n (OR XF-DPCH, )-
  • the LPN is provided with the estimated values of X+Y.
  • the LPN is configured to receive the T_dpch so that the LPN can match the LPN DL dedicated channel timing to the Macro DL dedicated channel timing from which the UL timing can be derived in the LPN
  • the RNC can then in some embodiments be configured to send a RADIO LINK SETUP REQUEST message to a particular LPN with the determined synchronisation parameters and flag indicating that LPN should setup an only UL Radio Link for monitoring DPCCH channel. It would be understood that this requires modification of RADIO LINK SETUP REQUEST in 3GPP specification (as expressed in TS 25.433 UTRAN lub interface Node B Application Part (NBAP) signalling).
  • NBAP Node B Application Part
  • the LPN can then be configured, based on the information in the RADIO LINK SETUP REQUEST to synchronize to the Macro UE UL DPCCH channel.
  • the LPN can be configured to send a RADIO LINK SETUP RESPONSE to the RNC after competition of RL setup.
  • the LPN can then be configured to determine an UL DPCCH SINR estimate, and further time stamp the UL DPCCH SINR (in some embodiments the LPN can time stamp the estimate with LPN SFN).
  • the Macro cell can be configured to perform a UL DPCCH power estimate and also time stamp the UL DPCCH power estimate (with the Macro cell SFN).
  • the RNC is configured to send a DEDICATED MEASUREMENT INITIATION REQUEST to LPN for starting measurement reporting of this UL link (the same RL ID as in RL setup procedure).
  • the LPN answers with a DEDICATED MEASUREMENT INITIATION RESPONSE to which is sent to the RNC.
  • the LPN may provide measurements to the RNC only if the measurements reach a threshold configured by the RNC. This in some embodiments can be understood to be an example of a reporting criteria being determined and transmitted from the RNC.
  • the reporting criteria can be received by the LPN and/or the Macro Node B and when the reporting criteria is met then the LPN and/or the Macro Node B can be configured to transmit the measurement report.
  • the LPN performs a SINR measurement for the particular Macro UL DPCCH channel and sends the DEDICATED MEASUREMENT REPORT.
  • the results of the measurements are those indicated in Dedicated Measurement Value/SIR value field.
  • the operation of measuring the UL of the MUE at the LPN is shown in Figure 10 by step 913.
  • step 404 The operation of performing a LPN measurement setup and reporting is shown in Figure 5 by step 404.
  • the base station of NB performs a SINR measurement for the particular Macro UL DPCCH channel and sends the DEDICATED MEASUREMENT REPORT.
  • the results of the measurements are those indicated in Dedicated Measurement Value/SIR value field.
  • step 917 The operation of measuring the UL of the Macro UE at the NB is shown in Figure 10 by step 917.
  • the RNC can be configured to receive reports from Macro about SINR of the same UL DPCCH channel from particular UE.
  • the reports are received on a regular basis.
  • the reports from the Macro and LPN are compared with the correct time reference.
  • trigger point of threshold which may cause other actions to be performed.
  • the RRM can then be configured on receipt of this information to perform suitable actions to minimize the interference.
  • Figure 6 differs from the operations shown with respect to Figure 5 in that having aligned measurement reports from the LPN and NB in the correct time reference and compared the SINR LPN to the SINR NB, when the comparison is determined to enable a suitable load balancing action to be performed, for example when the SINR LPN > SINR NB for the determined time period then the RNC is configured to transmit a request to the UE in question to perform inter-frequency measurements.
  • step 506 The operation of asking the UE to perform inter-frequency measurements is shown in Figure 6 by step 506.
  • Figure 15 shows for example a similar inter-frequency measurement interference mitigation based method similar to Figure 6.
  • the RNC first requests from the Macro BTS or Node B the RTT measurements to enable UE location estimation.
  • the request for RTT measurements is shown in Figure 15 by step 1301 .
  • the Node B is then configured in such embodiments to obtain the RTT measurements and pass the measurement information back to the RNC to analyse the measurements and determine the location of the UE.
  • the performing of the RTT measurements is shown in Figure 15 by step 1302.
  • the RNC in such embodiments can be configured to determine from the RTT information whether the UE is within a defined location (the RTT is true) and if so send the UE UL SC and macro LPN timing difference information to the LPN.
  • the UE location determination and sending the UE UL SC and macro LPN timing difference information to the LPN is shown in Figure 15 by step 1303.
  • the LPN can then in some embodiments be configured to synchronise the DPCCG and perform a SINR measurement.
  • the operation of performing a DPCCH synchronization and a SINR measurement is shown in Figure 15 by step 1304.
  • the LPN can then in such embodiments be configured to transmit the DPCCH SINR measurement results to the RNC.
  • the RNC can then be configured to compare the DPCCH SINR measurement results from the LPN against similar measurements from the NB. Where the comparison has a suitable trigger range or value to enable load balancing action to be performed, for example when the SINR LPN > SINR NB for a determined time period then the RNC is configured to transmit a request to the UE (via the NB) to perform inter-frequency (IF) measurements.
  • IF inter-frequency
  • Figure 16 shows a further example embodiment where the IF measurements are used to offload the UE.
  • the RNC or suitable network control entity can be configured to determine that LPN requires an offloading of at least one UE.
  • the operation of determining a need to offload is shown in Figure 16 by step 1501.
  • the RNC or suitable network control entity can then in some embodiments be configured to identify a suitable UE within the macro UE area.
  • the UE can be identified for example by the RTT measurements and the UE identified from the active set.
  • the RNC or suitable network control entity can then in some embodiments be configured to check whether a match has been found from the identification of the UE operation.
  • the operation of checking whether a match is found is shown in Figure 16 by step 1505.
  • the RNC or suitable network control entity can then in some embodiments if it fails to identify a match loop back to the need to offload step as shown in Figure 16 by step 1501.
  • the RNC or suitable network control entity can furthermore in some embodiments be configured to send the UL scrambling code and timing differences to the LPN with respect to the identified match UE.
  • the LPN can then in some embodiments be configured to measure the UE's UL SINR. Furthermore the LPN can in some embodiments pass the measurement of the UE's UL SINR to the RNC.
  • the operation of measurement of the UE's UL SINR is shown in Figure 16 by step 1509.
  • the RNC or suitable network control entity can then in some embodiments be configured to compare the UE UL SINR measurements from the LPN measurement and the macro base station measurement. When the trigger region or threshold for the comparison is reached then the RNC can be configured to trigger an IF measurement.
  • the operation of triggering the IF measurement is shown in Figure 16 by step 151 1 .
  • the UE can then in some embodiments be configured to start IF measurements.
  • the RNC or suitable network control entity can then in some embodiments be configured to then use the IF measurements to perform an IF handover (IFHO).
  • IFHO IF handover
  • step 1521 The operation of performing an IFHO is shown in Figure 16 by step 1521 .
  • the RNC can be configured to check whether a listening timer has expired.
  • the listening timer check is shown in Figure 16 by step 1515.
  • the RNC is configure to turn off the LPN listening mode and the operation is configured to pass back to the operation of attempting to identify a suitable UE.
  • the operation of turning off the LPN listening mode is shown in Figure 16 by step 1519.
  • the RNC is configured to check whether the RTT has changed.
  • the RNC or suitable network control entity can where the RTT is changed be configured to then in some embodiments be configured to pass back to the operation of attempting to identify a suitable UE.
  • the RNC or suitable network control entity can where the RTT has not changed be configured to, in some embodiments, pass back to the operation of instructing the LPN to measure the UE's UL SINR.
  • the above described exemplary implementation of the invention enables the network to mitigate the negative effect of UL/DL imbalance using currently deployed UEs. This is possible due to performing related activities and running described algorithms on the network side while utilizing legacy UE measurement capabilities. As such, it is possible in some embodiments to enable the mitigation of UL/DL power imbalance, which is a severe problem in deploying a Heterogeneous Network, by finding out the mostly interfering terminals even before network solutions can start working.
  • the "macro-cell” may alternatively be any cell which is larger than the one or more small (or smaller) cells which at least partially overlap the large (or larger) cell.
  • Some embodiments have been described in relation to small cells as LPN. Alternatively or additionally some embodiments may be used with small cells such as micro and/or pico and/or femto cells or the like.
  • the data processors may be of any type suitable to the local technical environment, and may include one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs), application specific integrated circuits (ASIC), gate level circuits and processors based on multi core processor architecture, as non-limiting examples.
  • the data processing may be distributed across several data processing modules.
  • a data processor may be provided by means of, for example, at least one chip. Appropriate memory capacity can also be provided in the relevant devices.
  • the memory or memories may be of any type suitable to the local technical environment and may be implemented using any suitable data storage technology, such as semiconductor based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory.
  • the various embodiments may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects of the invention may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device, although the invention is not limited thereto. While various aspects of the invention may be illustrated and described as block diagrams, flow charts, or using some other pictorial representation, it is well understood that these blocks, apparatus, systems, techniques or methods described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
  • the software may be stored on such physical media as memory chips, or memory blocks implemented within the processor, magnetic media such as hard disk or floppy disks, and optical media such as for example DVD and the data variants thereof, CD.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé et un appareil comportant un module de détermination d'équipement utilisateur configuré pour déterminer au moins un équipement utilisateur fonctionnant à l'intérieur d'une zone de nœud de grande cellule; un émetteur configuré pour transmettre au moins un paramètre opérationnel d'équipement utilisateur associé au dit au moins un équipement utilisateur vers un nœud de petite cellule; un récepteur configuré pour recevoir depuis le nœud de petite cellule une mesure de signaux de canal de liaison montante; le récepteur est également configuré pour recevoir depuis un nœud de grande cellule une mesure de signaux de canal de liaison montante; et un comparateur configuré pour comparer les mesures de signaux de canal de liaison montante depuis le nœud de petite cellule et le nœud de grande cellule.
PCT/EP2014/056503 2013-04-05 2014-04-01 Comparaison de mesures de signaux de canal de liaison montante à partir d'un nœud de petite cellule et d'un nœud de grande cellule WO2014161840A1 (fr)

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Citations (2)

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US20100093358A1 (en) * 2008-10-13 2010-04-15 Samsung Electronics Co. Ltd. Wireless communication system and handover method therein
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US20100093358A1 (en) * 2008-10-13 2010-04-15 Samsung Electronics Co. Ltd. Wireless communication system and handover method therein
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