WO2016050289A1 - Procédé, appareil et programme informatique d'aide à la mobilité d'équipement d'utilisateur - Google Patents

Procédé, appareil et programme informatique d'aide à la mobilité d'équipement d'utilisateur Download PDF

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Publication number
WO2016050289A1
WO2016050289A1 PCT/EP2014/071031 EP2014071031W WO2016050289A1 WO 2016050289 A1 WO2016050289 A1 WO 2016050289A1 EP 2014071031 W EP2014071031 W EP 2014071031W WO 2016050289 A1 WO2016050289 A1 WO 2016050289A1
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Prior art keywords
information
node
user equipment
set forth
measurement results
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PCT/EP2014/071031
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English (en)
Inventor
Ingo Viering
Patrick Marsch
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Nokia Solutions And Networks Oy
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Priority to PCT/EP2014/071031 priority Critical patent/WO2016050289A1/fr
Publication of WO2016050289A1 publication Critical patent/WO2016050289A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports

Definitions

  • the invention relates to a method, apparatus and computer program, and in particular but not exclusively to a method, apparatus and computer program for assisting user eguipment mobility.
  • a communication system can be seen as a facility that enables communication sessions between two or more entities such as fixed or mobile communication devices, base stations, servers and/or other communication nodes.
  • 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 communication devices can access the communication system and how various aspects of communication shall be implemented between communicating devices.
  • a communication can be carried on wired or wireless carriers. In a wireless communication system at least a part of the communication between at least two stations occurs over a wireless link.
  • 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 wireless system can be divided into cells, and hence these are often referred to as cellular systems.
  • a base station can serve one or more cells. Cells can have different shapes and sizes. Regardless of the shape and size of the cell providing access for a user equipment, such area can be called radio service area or access area. Neighbouring radio service areas typically overlap, and thus a communication in an area can listen to more than one base station.
  • 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 communication device is used for enabling receiving and transmission of communications such as speech and data.
  • 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 communication device may access a carrier provided by a station, for example a base station, and transmit and/or receive communications on the carrier.
  • Examples of communication systems attempting to satisfy the increased demands for capacity are architectures that are being standardized by the 3rd Generation Partnership Project (3GPP), such as the long-term evolution (LTE), or the Universal Mobile Telecommunications System (UMTS) radio-access technologies.
  • 3GPP 3rd Generation Partnership Project
  • LTE long-term evolution
  • UMTS Universal Mobile Telecommunications System
  • the LTE aims to achieve various improvements, for example reduced latency, higher user data rates, improved system capacity and coverage, reduced cost for the operator and so on.
  • LTE-Advanced A further development of the LTE is often referred to as LTE-Advanced.
  • the various development stages of the 3GPP LTE specifications are referred to as releases.
  • Fifth Generation (5G) radio systems may be commercially available around 2020, or sooner.
  • a method comprising: receiving, at a first node controlling a user equipment, information from at least one further node, said information comprising measurement results associated with said user equipment; and using said information at said first node for controlling mobility of said user equipment.
  • said method comprises sending a request to said at least one further node for said information.
  • said request comprises information for assisting said at least one further node to obtain said measurement results.
  • said information for assisting comprises at least one of: detected preamble information; synchronisation information; demodulation reference signal information; sounding signal information; detected data information.
  • said measurement results are received in terms of at least one of: power of a signal received by the at least one further node; quality of a signal received by the at least one further node; signal-to-interference plus noise ratio of a signal received by the at least one further node.
  • said method comprises selecting said at least one further node.
  • said method is initiated in response to a determination by said first node.
  • said determination by said first node comprises at least one of: a determination that the user equipment is transmitting sufficient signals; a determination that said at least one further node is available to assist; a determination that assistance is required; a determination that previous assistance was beneficial; a determination of a speed of movement of said user equipment.
  • the method comprises re-configuring a measurement and reporting schedule of said user equipment, in response to said received measurement results.
  • said first node is comprised in a serving cell, and said at least one further node is comprised in a cell neighbouring said serving cell.
  • said controlling mobility comprises one of: initiating a cell handover of said user equipment; initiating a cell re-selection of said user equipment; maintaining said first node as a controlling node.
  • the method comprises determining that measurement results are no longer required from the at least one further node, and sending a message to the at least one further node that measurement results are no longer required.
  • a computer program comprising computer executable instructions which when run on one or more processors performs the method of the first aspect.
  • a method comprising: performing, at a first node, measurements associated with a user equipment in communication with said first node so as to obtain measurement results; sending information comprising said measurement results to a further node controlling said user equipment, for controlling mobility of said user equipment.
  • said method comprises receiving a request for said information.
  • the method comprises storing signal information from said user equipment prior to receiving said request.
  • said request comprises information for assisting said first node to obtain said measurement results.
  • said information for assisting comprises at least one of: detected preamble information; synchronisation information; demodulation reference signal information; sounding signal information; detected data information.
  • said measurement results are provided in terms of at least one of: power of a signal received by the first node; quality of a signal received by the first node; signal-to-interference plus noise ratio of a signal received by the first node.
  • said further node is comprised in a serving cell, and said first node is comprised in a cell neighbouring said serving cell.
  • the method comprises receiving a message that measurement results are no longer required.
  • a computer program comprising computer executable instructions which when run on one or more processors performs the method of the third aspect.
  • an apparatus comprising at least one processor; and at least one memory including computer program code; the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to: receive information from at least one node, said information comprising measurement results associated with user equipment controlled by said apparatus; and using said information at said apparatus for controlling mobility of said user equipment.
  • said apparatus is configured to send a request to said at least one node for said information.
  • said request comprises information for assisting said at least one node to obtain said measurement results.
  • said information for assisting comprises at least one of: detected preamble information; synchronisation information; demodulation reference signal information; sounding signal information; detected data information;
  • said measurement results are received in terms of at least one of: power of a signal received by the at least one further node; quality of a signal received by the at least one further node; signal-to-interference plus noise ratio of a signal received by the at least one further node.
  • the apparatus is configured to select said at least one further node.
  • said apparatus is configured to receive said measurement results in response to an initiation by said apparatus, said initiation in response to a determination by said apparatus.
  • said determination by said apparatus comprises at least one of: a determination that the user equipment is transmitting sufficient signals; a determination that said at least one node is available to assist; a determination that assistance is required; a determination that previous assistance was beneficial; a determination of a speed of movement of said user equipment.
  • the apparatus is configured to re-configure a measurement and reporting schedule of said user equipment, in response to said received measurement results.
  • said apparatus is comprised in a serving cell, and said at least one node is comprised in a cell neighbouring said serving cell.
  • said controlling mobility comprises one of: initiating a cell handover of said user equipment; initiating a cell re-selection of said user equipment; maintaining said first node as a controlling node.
  • the apparatus is configured to determine that measurement results are no longer required from the at least one further node, and to send a message to the at least one node that measurement results are no longer required.
  • an apparatus comprising means for receiving information from at least one node, said information comprising measurement results associated with user equipment controlled by said apparatus; and means for using said information at said apparatus for controlling mobility of said user equipment.
  • said apparatus comprises means for sending a request to said at least one node for said information.
  • said request comprises information for assisting said at least one node to obtain said measurement results.
  • said information for assisting comprises at least one of: detected preamble information; synchronisation information; demodulation reference signal information; sounding signal information; detected data information;
  • said measurement results are received in terms of at least one of: power of a signal received by the at least one further node; quality of a signal received by the at least one further node; signal-to-interference plus noise ratio of a signal received by the at least one further node.
  • the apparatus comprises means for selecting said at least one further node.
  • said apparatus is configured to receive said measurement results in response to an initiation by said apparatus, said initiation in response to a determination by said apparatus.
  • said determination by said apparatus comprises at least one of: a determination that the user equipment is transmitting sufficient signals; a determination that said at least one node is available to assist; a determination that assistance is required; a determination that previous assistance was beneficial; a determination of a speed of movement of said user equipment.
  • the apparatus comprises means for re- configuring a measurement and reporting schedule of said user equipment, in response to said received measurement results.
  • said apparatus is comprised in a serving cell, and said at least one node is comprised in a cell neighbouring said serving cell.
  • said controlling mobility comprises one of: initiating a cell handover of said user equipment; initiating a cell re-selection of said user equipment; maintaining said first node as a controlling node.
  • the apparatus comprises means for determining that measurement results are no longer required from the at least one further node, and mean for sending a message to the at least one node that measurement results are no longer required.
  • an apparatus comprising at least one processor; and at least one memory including computer program code; the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to: perform measurements associated with a user equipment in communication with said apparatus so as to obtain
  • said apparatus is configured to receive a 20 request for said information.
  • the apparatus is configured to store in said memory signal information from said user equipment prior to receiving said request.
  • said request comprises information for assisting said apparatus to obtain said measurement results.
  • said information for assisting comprises at least one of: detected preamble information; synchronisation information; demodulation reference signal information; sounding signal information; detected data information.
  • said apparatus is configured to provide said measurement results in terms of at least one of: power of a signal received by the apparatus; quality of a signal received by the apparatus; signal-to-interference plus noise ratio of a signal received by the apparatus.
  • said node is comprised in a serving cell
  • said apparatus is comprised in a cell neighbouring said serving cell
  • the apparatus is configured to receive a message that measurement results are no longer required.
  • an apparatus comprising means for performing measurements associated with a user equipment in communication with said apparatus so as to obtain measurement results; and means for sending information comprising said measurement results to a node controlling said user equipment, for controlling mobility of said user equipment.
  • said apparatus comprises means for receiving a request for said information.
  • the apparatus comprises means for storing signal information from said user equipment prior to receiving said request.
  • said request comprises information for assisting said apparatus to obtain said measurement results.
  • said information for assisting comprises at least one of: detected preamble information; synchronisation information; demodulation reference signal information; sounding signal information; detected data information.
  • said apparatus comprises means for providing said measurement results in terms of at least one of: power of a signal received by the apparatus; quality of a signal received by the apparatus; signal-to-interference plus noise ratio of a signal received by the apparatus.
  • said node is comprised in a serving cell
  • said apparatus is comprised in a cell neighbouring said serving cell
  • the apparatus comprises means for receiving a message that measurement results are no longer required.
  • Figure 1 shows a schematic diagram of a network according to some embodiments
  • Figure 2 shows a schematic diagram of a communication device according to some embodiments
  • Figure 3 shows a schematic diagram of a control apparatus according to some embodiments
  • Figure 4 shows a user equipment in communication with a serving cell and a neighbouring cell
  • Figure 5 shows another example of a user equipment in communication with a serving cell and a neighbouring cell
  • Figure 6 shows architecture of a 5G system
  • Figure 7 shows a user equipment in communication with a serving cell and a neighbouring cell according to an embodiment
  • Figure 8 is a flow chart according to an embodiment.
  • a communication device or user equipment 101 , 1 02, 103, 104 is typically provided wireless access via at least one base station or similar wireless transmitter and/or receiver node of an access system.
  • five neighbouring and overlapping cells 100, 1 10, 1 1 5, 1 17 and 1 19 are shown being provided by base stations 106, 107, 1 16, 1 18 and 120 respectively.
  • An access system can be provided by a cell of a cellular system or another system enabling a communication device to access a communication system.
  • a base station site 106, 107, 1 16, 1 18 and 120 can provide one or more cells.
  • a radio link within a cell can be identified by a single logical identification belonging to that cell.
  • a base station can provide one or more radio service areas.
  • Each communication device 1 02, 103 and 105, and base station 1 06, 107, 1 16, 1 18 and 120 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.
  • Base stations 106 and 107 are typically controlled by at least one appropriate controller apparatus 108, 109 so as to enable operation thereof and management of communication devices 102, 103, 105 in communication with the base stations 106, 107, 1 16, 1 18 and 120.
  • the control apparatus 1 08, 109 can be interconnected with other control entities.
  • the control apparatus 109 can typically be provided with memory capacity 301 and at least one data processor 302.
  • the control apparatus 109 and functions may be distributed between a plurality of control units.
  • each base station 106, 1 07, 1 16, 1 18 and 120 can comprise a control apparatus 108, 109.
  • Figure 1 depicts two wide area base stations 106, 107, which can be macro-eNBs 106, 107 in an LTE system.
  • the macro-eNBs 106, 107 transmit and receive data over the entire coverage of the cells 100 and 1 10 respectively.
  • Figure 1 also shows a smaller area base station or access point which in some embodiments can be a pico, a femto or Home eNB 120.
  • the coverage of the smaller area base station 120 is generally smaller than the coverage of the wide area base stations 106, 107.
  • the coverage provided by the smaller area node 120 overlaps with the coverage provided by the macro-eNBs 1 06, 1 07.
  • Pico eNBs can be used to extend coverage of the macro-eNBs 106, 1 07 outside the original cell coverage 100, 1 10 of the macro-eNBs 106, 107.
  • the pico eNB can also be used to provide cell coverage in "gaps" or "shadows" where there is no coverage within the existing cells 100, 1 1 0 and/or may serve "hot spots".
  • the smaller area node can be a femto or Home eNB which can provide coverage for a relatively small area such as the home. Some environments may have both pico and femto cells.
  • the radio service areas can overlap.
  • signals transmitted in an area can interfere with communications in another area (macro to macro, pico/femto to either one or both of the macro cells, and/or pico/femto to pico/femto).
  • the communication devices 102, 1 03, 105 can 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 examples include time division multiple access (TDMA), frequency division multiple access (FDMA) and various schemes thereof such as the interleaved frequency division multiple access (IFDMA), 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
  • IFDMA interleaved frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SDMA space division multiple access
  • LTE long-term evolution
  • UMTS Universal Mobile Telecommunications System
  • Non-limiting examples of appropriate access nodes are a base station of a cellular system, for example what is known as NodeB (NB) in the vocabulary of the 3GPP specifications.
  • the LTE employs a mobile architecture known as the Evolved Universal Terrestrial Radio Access Network (E-UTRAN).
  • Base stations of such systems are known as evolved Node Bs (eNBs) and may provide E-UTRAN features such as user plane Radio Link Control/Medium Access Control/Physical layer protocol (RLC/MAC/PHY) and control plane Radio Resource Control (RRC) protocol terminations towards the user devices.
  • RLC/MAC/PHY Radio Link Control/Medium Access Control/Physical layer protocol
  • RRC Radio Resource Control
  • Other examples of radio access systems 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).
  • Fifth Generation (5G) radio systems may be commercially available around 2020.
  • the base stations 106, 107, 1 16, 1 18 and 120of the access systems can be connected to a wider communications network 1 13.
  • a controller apparatus 107, 109 may be provided for coordinating the operation of the access systems.
  • a gateway function 1 12 may also be provided to connect to another network via the network 1 13.
  • the smaller area base station 1 18 can also be connected to the other network by a separate gateway function 1 1 1 .
  • the base stations 106, 1 07, 1 1 6, 1 1 8 and 120 can be connected to each other by a communication link for sending and receiving data.
  • the communication link can be any suitable means for sending and receiving data between the base stations 106, 1 07, 1 16, 1 1 8 and 120 and in some embodiments the communication link is an X2 link.
  • the other network may be any appropriate network.
  • a wider communication system may thus be provided by one or more interconnected networks and the elements thereof, and one or more gateways may be provided for interconnecting various networks.
  • FIG. 2 shows a schematic, partially sectioned view of a communication device 200 that a user can use for communication.
  • a communication device is often referred to as user equipment (UE) or terminal.
  • An appropriate communication device may be provided by any device capable of sending and receiving radio signals.
  • the communication device may be mobile or may be generally stationary. Non-limiting examples include a mobile station (MS) such as a mobile phone or what is known as a 'smart phone', a portable computer provided with a wireless interface card or other wireless interface facility, personal data assistant (PDA) provided with wireless communication capabilities, a computer or any combinations of these or the like.
  • MS mobile station
  • PDA personal data assistant
  • a 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 device 200 may receive signals over an air interface 207 via appropriate apparatus for receiving and may transmit signals via appropriate apparatus for transmitting radio signals.
  • transceiver apparatus is designated schematically by block 206.
  • the transceiver apparatus 206 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 communication device.
  • the communication device is also typically provided with at least one data processing entity 201 , at least one memory 202 and other possible components 203 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 i o relevant control apparatus can be provided on an appropriate circuit board and/or in chipsets. This feature is denoted by reference 204.
  • the user may control the operation of the communication device by means of a suitable user interface such as key pad 205, voice commands, touch sensitive 15 screen or pad, combinations thereof or the like.
  • a display 208, a speaker and a microphone can be also provided.
  • a 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.
  • FIG. 3 shows an example of a control apparatus 300 for a communication system, for example to be coupled to and/or for controlling a station of an access system.
  • the base stations 106, 107, 1 16, 1 18 and 120 comprise a control apparatus 300.
  • each base station will have a control apparatus.
  • the control apparatus can be
  • the control apparatus 300 can be arranged to provide control of communications by communication devices that are in the service area of the system.
  • the control apparatus 300 can be configured to provide control functions in association with generation and communication of transmission patterns and other related information by means of the data processing facility in
  • control apparatus 300 comprises at least one memory 301 , at least one data processing unit 302, 303 and an input/output interface 304. Via the interface the control apparatus can be coupled to a receiver and a transmitter of the base station.
  • the control apparatus 300 can be configured to execute an appropriate software code to provide the control functions.
  • UEs by virtue of their portable nature, need to be able to change cells during movement of the UE.
  • those cell changes are typically referred to as “handovers”.
  • handovers In idle mode where the UE is not directly connected to the network those cell changes are called “cell re-selection”.
  • mobility also comprises the addition of cells to and removal of cells from an "active set". This is already used for soft-handover in 3G, and for CoMP (co-ordinated multi-point) methods in LTE.
  • Handover and re-selection decisions are based on measurements. Typically the measurements are carried out by the UEs using "reference signals" emitted by the base stations. If the decisions are made at the base station (handover, removal/addition to active set), the measurements have to be signalled to the base station from the UE. These signalled measurements are known as "measurement reports”.
  • FIG. 4 shows a UE 403 under the control of a serving cell 417.
  • Cell 419 neighbours the serving cell 417.
  • Base station 418 is located in serving cell 417 and base station 420 is located in neighbour cell 41 9.
  • Downlink reference signals illustrated by the dashed lines, are transmitted from the base stations 418 and 420 and received at the UE 403.
  • the UE processes these reference signals (e.g. takes measurements), and sends a measurement report (shown by the solid line) to the serving cell base station 418.
  • This method requires UE complexity to execute the measurements, and uplink capacity to report the measurements. Therefore there is a trade-off.
  • regular measurement taking and reporting of those measurements may help make optimal mobility decisions. Any delay of the measurement reports may cause mobility problems.
  • the minimization of measurement reports saves uplink resources and terminal power.
  • Attempts to overcome this trade-off have been made by using "smart trigger” conditions for measurement reports. For instance, intra-frequency handovers in LTE are typically triggered through the "A3" condition which requires the measurement of a neighbor cell to be better than the same measurement of the serving cell, for handover to be triggered.
  • the trigger conditions are further subject to reliability filters (time to trigger and averaging) to make sure that a short-term / random outlier does not cause a trigger condition.
  • this method aims to ensure that a measurement report is only carried out when required.
  • this method has at least the following problems. First, it requires a careful configuration of the trigger conditions (thresholds, etc.). Secondly, the availability of measurements is relatively sparse. If measurements are used for location information for example ("RF fingerprint”), more measurements are required. Thirdly, measurements inherently suffer some delay caused by the averaging filters as well as the time to triggers.
  • periodic measurements can be configured. This increases terminal complexity and the required uplink capacity. The inherent delay through averaging and time to trigger also remains.
  • Channel reciprocity is known. In channel reciprocity, instead of UEs carrying out measurements on downlink reference signals, the measurements can be taken directly by the base stations based on uplink signals from the UE.
  • FIG. 5 shows a UE 503 under the control of a serving cell 51 7.
  • Cell 51 9 neighbours the serving cell 51 7.
  • Base station 51 8 is located in serving cell 517 and base station 520 is located in neighbour cell 519.
  • Uplink signals are sent from the UE to the base stations 518 and 520. These signals may comprise, for example, sounding signals, random access channel (RACH) signals, UL control signals etc.
  • the base stations 518 and 520 receive and process these signals, and take measurements.
  • the base station can only carry out measurements when the terminal is transmitting sufficient signals.
  • a contradicting design target is the power consumption of the UE which requires economic UE transmission methods (control channels, sounding signals, data, etc.).
  • measurements are typically needed at the serving cell (cell 517 in Figure 5).
  • the serving cell 517 can only measure the channel between the UE 503 and the serving cell itself.
  • the other channels e.g. the channel between UE 503 and base station 520
  • a problem is that the neighboring cell 519 must then be able to measure the UE 503 at all times, i.e. it has to have sufficient knowledge of the signals to be measured.
  • signalling between base stations may be used to enable the measurements and mobility decisions at the serving cell.
  • a possible exception to this is where a UE is moving inside a RAN cloud with centralized L2 or L3 processing, where all measurements are available to the same node which potentially makes explicit inter-node signalling redundant (it can be replaced by internal interfaces / buses).
  • Figure 6 shows several architecture options for a 5G system. It has been observed that within a cloud (scenario B shown in block 602) the measurements would be centrally available. However, there still needs to be an option for mobility between the clouds, or between standalone base stations.
  • neighbour cell A is x dB stronger or y dB weaker. This may enable the above mentioned problem of lack of knowledge of actual UE power being circumvented.
  • the UE could use a fixed transmit power (which may lead to dynamic range problems), or the UE has to convey information regarding its current transmit power.
  • base stations that neighbour a serving base station are used to take measurements of a mobile that is connected to the serving base station (which may be in response to receiving a request from the serving base station). Then, the neighbouring base stations provide these extra measurements to the serving base station, which in turn can then take any necessary mobility actions (e.g. handover, cell-re-selection etc.). Therefore embodiments exploit channel reciprocity as a way to increase the number of measurements and thus acquire an improved picture of the state of the channel, in order to assist with mobility.
  • the measurements received at the serving cell from the neighbouring cell may be in addition to measurements received at the serving cell directly from the UE in question.
  • the measurement results may be, for example, power, quality, SINR, or something else.
  • the neighbouring base station may need some information in order to be able to assist with obtaining the measurement results. These may be details on UE signals which are not known a priori.
  • the information required by the neighbouring base station may be included in the request from the serving base station for the measurement results, and the information may include for example information about a detected preamble, sounding reference signals etc.
  • Figure 7 shows a UE 703 under the control of a serving cell 717.
  • Cell 719 neighbours the serving cell 717.
  • Base station 718 is located in serving cell 717 and base station 720 is located in neighbour cell 719.
  • Uplink signals shown by the solid arrows, are sent from the UE to the base stations 718 and 720. These signals may comprise, for example, sounding signals, random access channel (RACH) signals, UL control signals etc.
  • RACH random access channel
  • the base stations 718 and 720 receive and process these signals, and take measurements.
  • base station 718 in serving cell 717 determines whether channel reciprocity can be used and whether it would be helpful in the given situation.
  • This is step 801 in Figure 8.
  • This may be a vendor-specific step. That is vendors can define under what conditions channel reciprocity is to be used for mobility purposes. For instance, it may be considered that channel reciprocity will be useful if a UE is determined to be transmitting sufficient signals to obtain a good picture of the channel, or if it is determined that location information is needed. It may also be determined that channel reciprocity is useful when it is determined that at least one neighbouring base station is available to assist; or a determination that assistance is required; or a determination of a speed of movement of the UE. The determination of the speed of movement of the UE may comprise determining that the UE is moving above a certain threshold speed i.e. that it is "fast-moving".
  • the base station 718 determines which cells should be measuring the UE. These may be cells neighbouring the serving cell. This could be either based on classical UE measurement reports, or it could be done "blindly” by configuring a certain neighbourhood. This is shown as step 802 in Figure 8.
  • the base station 718 of the serving cell contacts the base stations in the selected neighbouring cell(s) (e.g. base station 720 of neighbour cell 719) and asks them for assistance.
  • This request may contain information about the signals to be measured. This is shown as step 803 in Figure 8.
  • the base station of the assisting cell measures the UE using information from the UE.
  • Such information can be, for example: detected preamble information; synchronisation information; demodulation reference signal (DRS) information; sounding signal information; detected data information.
  • the measurements may also relate to, for example: quality of a signal received by the base station 720; SINR (signal to interference plus noise ratio) of a signal received by the base station 720 (where the signal received by the base station could for example be a RACH signal).
  • SINR signal to interference plus noise ratio
  • the base station 720 of the neighbouring cell then sends the determined measurement information or measurement results to the base station 718 of the serving cell. This is shown as step 805 in Figure 8.
  • the serving cell will only realize the need for assistance after the UE signal has already been transmitted.
  • the base station 720 of neighbouring cell 719 may store all the received signals for a certain amount of time, such that the signal information is still available for measurement when receiving the corresponding request for assistance. In such embodiments this step of storing may be considered as a precursor to step 801 .
  • the serving base station 718 collects the measurement results from the assisting neighbours (for example base station 720). This is shown as step 806 in Figure 8.
  • the serving base station 718 may also store these measurements in its memory.
  • the base station Based upon the received measurements, the base station makes a mobility decision. This is shown as step 807 in Figure 8.
  • the mobility decision may be for example to handover or re-select the UE to another cell. Alternatively the decision may be for the UE to remain in the same serving cell.
  • Base station 718 may also reconfigure the UE to perform more or fewer measurements and to send more or fewer measurement reports, based upon the measurements collected from the neighbouring cells. This is shown as step 808 in Figure 8.
  • the dashed arrow in Figure 7 represents a reconfiguration request being sent from the base station 718 to the UE 703. If base station 718 of the serving cell detects that neighbour assistance is no longer helpful (e.g. not enough uplink activity, no useful measurements received from neighbours, UE moves inside a cloud), the base station may de-configure the neighbour assistance.
  • FIG. 7 shows one UE 703 operating with one serving cell 717 and one neighboring cell 719 for the purposes of explanation, there may of course be many more UEs and neighboring cells in practice.
  • a cell When a cell detects a RACH it can provide the detected information (e.g. preamble, sync information) to the neighbours and ask them to analyse the same signal using the detected information. As discussed above, this may require the neighbour to store information of a signal for a certain amount of time given by the processing delay and the delay of the interface between the cells.
  • Embodiments may be applicable to users who are transmitting regularly. For instance, in an embodiment of a user with a video upstream, measurements could be taken based on dedicated demodulation reference signals, if available. Measurements could also be taken based on the detected data when the neighbours store the signals for later analysis as already assumed for RACH assistance.
  • the classical measurement reports may even be entirely de-configured, as decisions on cell handover and reselection could be based solely on measurements performed by the serving and supporting base stations
  • so-called sounding reference signals (SRS) are configured in the uplink to obtain channel state information in the serving cells. If those are configured, the serving cell can provide the SRS pattern to the neighbour and measurements can be based on SRS.
  • Embodiments may improve UE mobility. Furthermore, embodiments may increase the availability of measurements in general, wherever they are needed. For instance, location information can be updated more frequently.
  • uplink capacity is saved since fewer measurement reports may be required (although more measurements can be made available if demanded). Measurement delays may also be minimized, since the base station has ready access to the raw measurements. Furthermore embodiments do not require the UE to be forced to transmit permanently.
  • Some embodiments may find utility in a 5G system.
  • the required data processing apparatus and functions of a base station apparatus, a communication device and any other appropriate station may be provided by means of one or more data processors.
  • the described functions at each end may be provided by separate processors or by an integrated processor.
  • 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.
  • Some embodiments may be implemented by computer software executable by a data processor of the communication device, such as in the processor entity, or by hardware, or by a combination of software and hardware.
  • any blocks of the logic flow as in the Figures may represent program steps, or interconnected logic circuits, blocks and functions, or a combination of program steps and logic circuits, blocks and functions.
  • 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.
  • the memory 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.
  • 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.

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

Abstract

L'invention concerne un procédé comprenant les étapes suivantes : recevoir, au niveau d'un premier nœud assurant la commande d'un équipement d'utilisateur, des informations provenant d'au moins un autre nœud, lesdites informations comprenant des résultats de mesure associés audit équipement d'utilisateur; et utiliser lesdites informations au niveau dudit premier nœud pour assurer la commande de la mobilité dudit équipement d'utilisateur.
PCT/EP2014/071031 2014-10-01 2014-10-01 Procédé, appareil et programme informatique d'aide à la mobilité d'équipement d'utilisateur WO2016050289A1 (fr)

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Citations (3)

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EP1740007A1 (fr) * 2005-06-27 2007-01-03 Samsung Electronics Co., Ltd. Méthode et système de determination de transfert dans un dans un système de communication mobile
US20110103282A1 (en) * 2008-06-30 2011-05-05 Samsung Electronics Co., Ltd. Method and device for controlling hand-over message transmission power in a mobile communications system
US20130308473A1 (en) * 2012-05-17 2013-11-21 Ying Sun Signaling support for multi sector deployment in cellular communications

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EP1740007A1 (fr) * 2005-06-27 2007-01-03 Samsung Electronics Co., Ltd. Méthode et système de determination de transfert dans un dans un système de communication mobile
US20110103282A1 (en) * 2008-06-30 2011-05-05 Samsung Electronics Co., Ltd. Method and device for controlling hand-over message transmission power in a mobile communications system
US20130308473A1 (en) * 2012-05-17 2013-11-21 Ying Sun Signaling support for multi sector deployment in cellular communications

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