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WO2015065352A1 - Gestion de mobilité pour un déploiement de petites cellules dans un système d'évolution à long terme - Google Patents

Gestion de mobilité pour un déploiement de petites cellules dans un système d'évolution à long terme Download PDF

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Publication number
WO2015065352A1
WO2015065352A1 PCT/US2013/067402 US2013067402W WO2015065352A1 WO 2015065352 A1 WO2015065352 A1 WO 2015065352A1 US 2013067402 W US2013067402 W US 2013067402W WO 2015065352 A1 WO2015065352 A1 WO 2015065352A1
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WIPO (PCT)
Prior art keywords
cell
cells
target cell
target
controller
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Ceased
Application number
PCT/US2013/067402
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English (en)
Inventor
Amitav Mukherjee
Sudhanshu Gaur
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Hitachi Ltd
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Hitachi Ltd
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Filing date
Publication date
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Priority to PCT/US2013/067402 priority Critical patent/WO2015065352A1/fr
Publication of WO2015065352A1 publication Critical patent/WO2015065352A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0058—Transmission of hand-off measurement information, e.g. measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
    • H04W36/00692—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink using simultaneous multiple data streams, e.g. cooperative multipoint [CoMP], carrier aggregation [CA] or multiple input multiple output [MIMO]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
    • H04W56/0045—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by altering transmission time

Definitions

  • the present invention relates generally to wireless systems and, more particularly, to mobility management for small cell deployment in long term evolution (LTE) systems.
  • LTE long term evolution
  • a macro cell In a typical LTE/LTE-Advanced heterogeneous network, macro cells are deployed to provide the coverage and mobility management, while small cells are deployed to further enhance the user throughput.
  • a macro cell makes the handover decision based on the measurements of the signal strength from its neighboring macro cells only. This handover mechanism does not take the signal strength of small cells into account and thus may not be able to take fully advantage of small cell deployment.
  • a macro cell has a coverage range of up to 35 kilometers, while a small cell has a coverage range of 10 meters to 2 kilometers, which is about 1-3 orders of magnitude smaller than that of a macro cell.
  • FIG. 1 shows a conventional handover procedure between two macro eNBs in a LTE network. The following steps are expected: [0004] 1.
  • a UE user equipment or user
  • RSRP Reference Signal Received Power
  • the serving macro eNB also called source eNB decides to handover the UE to another macro eNB (called target eNB) based on the measurement reports. For example, the RSRP of the target eNB is greater than that of the source eNB. It sends a Handover (HO) preparation request to the target eNB.
  • HO Handover
  • the target macro eNB replies with a HO preparation request Acknowledgement (ACK).
  • ACK Acknowledgement
  • the source macro eNB sends a HO command to the UE and starts data forwarding to the target macro eNB.
  • the UE performs cell acquisition by sending a random access request to the target macro eNB.
  • the target macro eNB confirms the establishment of the connection by sending Uplink Grant (UG) and Timing Advance (TA).
  • UG Uplink Grant
  • TA Timing Advance
  • the UE sends the HO confirmation to the target macro eNB to complete the whole handover process.
  • LTE Rel-12 (Release 12)
  • dual connectivity is introduced which allows a UE to connect to two eNBs simultaneously.
  • a typical employment of dual connectivity is shown in FIG. 2, where a UE is connected to a macro eNB on frequency band F1 and a small cell eNB on frequency band F2 at the same time.
  • the macro eNB handles the mobility management and all control signaling (e.g., RRC (Radio Resource Control) signaling) for the UE, and acts as a mobility anchor.
  • RRC Radio Resource Control
  • packets are routed through this point for intra E-UTRAN mobility and mobility with other 3GPP technologies.
  • the data can come from both the macro eNB and small cell eNB to improve the UE throughput. Both the macro eNB and small cell eNB are considered as serving eNBs for the UE.
  • Exemplary embodiments of the invention provide two handover mechanisms for small cell deployment.
  • the first handover mechanism can improve the system throughput by triggering the handover based on the signal strength measurements from both macro cells and small cells.
  • the second handover mechanism can improve the control signaling reliability by allowing a small cell to be a temporary mobility anchor for a UE, which is used to handle all control signaling for the UE. This invention can be used to in a
  • LTE-A heterogeneous network to improve the throughput performance and reliability of control signaling, especially for dense small cell deployment.
  • An aspect of the present invention is directed to a cell in a communications system which includes a plurality of cells having one or more macro cells and one or more small cells, a user equipment (UE), and a network through which the cells and the UE communicate with each other.
  • a cell in a communications system which includes a plurality of cells having one or more macro cells and one or more small cells, a user equipment (UE), and a network through which the cells and the UE communicate with each other.
  • the cell comprises a memory and a controller.
  • the cell is a source cell that serves as a mobility anchor of the UE to handle all control signaling for the UE and receiving a measurement report from the UE.
  • the controller of the source cell is operable to: choose, based on the measurement report, a target cell from the plurality of cells as a new mobility anchor of the UE; send a handover preparation request to the target cell; receive a handover preparation request acknowledgement from the target cell; and send a handover preparation command to the UE and start data forwarding to the target cell.
  • the controller is operable to choose, ⁇ based on the measurement report, the target cell having a highest Reference
  • RSRP Signal Received Power
  • a communications system comprises: a plurality of cells including one or more macro cells and one or more small cells; a user equipment (UE); and a network through which the plurality of cells and the UE communicate with each other.
  • UE user equipment
  • One of the plurality of cells is a source cell that serves as a mobility anchor of the UE to handle all control signaling for the UE and receives a measurement report from the UE, the source cell including a memory and a controller, the controller of the source cell being operable to: choose, based on the measurement report, a target cell from the plurality of cells as a new mobility anchor of the UE; send a handover preparation request to the target cell; receive a handover preparation request acknowledgement from the target cell; and send a handover preparation command to the UE and start data forwarding to the target cell.
  • the UE has a UE memory and a UE controller which is operable to perform cell acquisition by sending a random access request to the target cell.
  • the target cell has a memory and a controller which is operable to confirm establishment of a connection with the UE by sending an Uplink Grant (UG) and a Timing Advance (TA).
  • the UE controller is operable to send a handover confirmation to the target cell.
  • the controller of the source cell is operable to choose, based on the measurement report, the target cell having a highest Reference Signal Received Power (RSRP) to the UE among the plurality of cells.
  • RSRP Reference Signal Received Power
  • Another aspect of this invention is directed to a computer program for mobility management in a communications system which has a plurality of cells including one or more macro cells and one or more small cells, a user equipment (UE), and a network through which the plurality of cells and the UE communicate with each other, wherein one of the plurality of cells is a source cell that serves as a mobility anchor of the UE to handle all control signaling for the UE and receives a measurement report from the UE.
  • the source cell includes a memory and a controller.
  • the computer program comprises: code for choosing by the source cell, based on the measurement report, a target cell from the plurality of cells as a new mobility anchor of the UE; code for sending by the source cell a handover preparation request to the target cell; code for receiving by the source cell a handover preparation request acknowledgement from the target cell; and code for sending by the source cell a handover preparation command to the UE and start data forwarding to the target cell.
  • the computer program further comprises code for performing cell acquisition by sending a random access request from the UE to the target cell.
  • the computer program further comprises code for confirming by the target cell establishment of a connection with the UE by sending an Uplink Grant (UG) and a Timing Advance (TA).
  • UG Uplink Grant
  • TA Timing Advance
  • the computer program according to claim 13, further comprises code for sending by the UE a handover confirmation to the target cell.
  • the code for choosing the target cell comprises code for choosing by the source cell, based on the
  • the target cell having a highest Reference Signal Received Power (RSRP) to the UE among the plurality of cells.
  • RSRP Reference Signal Received Power
  • Another aspect of this invention is directed to a non-transient computer readable storage medium storing a plurality of instructions for controlling a data processor to provide mobility management in a
  • the communications system which has a plurality of cells including one or more macro cells and one or more small cells, a user equipment (UE), and a network through which the plurality of cells and the UE communicate with each other, wherein one of the plurality of cells is a source cell that serves as a mobility anchor of the UE to handle all control signaling for the UE and receives a measurement report from the UE.
  • the source cell includes a memory and the data processor.
  • the plurality of instructions comprise: instructions that cause the data processor to choose, based on the measurement report, a target cell from the plurality of cells as a new mobility anchor of the UE; instructions that cause the data processor to send a handover preparation request to the target cell; instructions that cause the data processor to receive a handover preparation request acknowledgement from the target cell; and instructions that cause the data processor to send a handover preparation command to the UE and start data forwarding to the target cell.
  • FIG. 1 shows a conventional handover procedure between two macro eNBs in a LTE network.
  • FIG. 2 shows a typical employment of dual connectivity in a LTE network.
  • FIG. 3 is a block diagram showing an example of the primary eNB modules involved in the proposed solutions.
  • FIG. 4 shows an example of the mobility management module illustrating the internal processing thereof.
  • FIG. 5 shows an example of a small cell dense deployment scenario.
  • FIG. 6 is a diagram illustrating an example of the handover procedure for throughput improvement.
  • FIG. 7 shows another example of a small cell dense deployment scenario involving Coordinated Multi-Point (CoMP) transmission.
  • CoMP Coordinated Multi-Point
  • FIG. 8 is a diagram illustrating an example of the handover procedure for throughput improvement involving CoMP transmission.
  • FIG. 9 is a diagram illustrating an example of the handover procedure to improve control signaling reliability.
  • FIG. 10 shows an example of small cell dense deployment illustrating the proposed handover procedure to improve control signaling reliability.
  • processing can include the actions and processes of a computer system or other information processing device that manipulates and transforms data represented as physical (electronic) quantities within the computer system's registers and memories into other data similarly represented as physical quantities within the computer system's memories or registers or other information storage, transmission or display devices.
  • the present invention also relates to an apparatus for performing the operations herein.
  • This apparatus may be specially constructed for the required purposes, or it may include one or more general- purpose computers selectively activated or reconfigured by one or more computer programs.
  • Such computer programs may be stored in a computer- readable storage medium, such as, but not limited to optical disks, magnetic disks, read-only memories, random access memories, solid state devices and drives, or any other types of media suitable for storing electronic information.
  • the algorithms and displays presented herein are not inherently related to any particular computer or other apparatus.
  • Various general-purpose systems may be used with programs and modules in accordance with the teachings herein, or it may prove convenient to construct a more specialized apparatus to perform desired method steps.
  • the present invention is not described with reference to any particular programming language. It will be appreciated that a variety of programming languages may be used to implement the teachings of the invention as described herein.
  • the instructions of the programming language(s) may be executed by one or more processing devices, e.g., central processing units (CPUs), processors, or controllers.
  • Exemplary embodiments of the invention provide apparatuses, methods and computer programs for mobility management for small cell deployment in LTE systems.
  • the mobility management is performed in the macro layer, i.e., the handovers only occur between two macro eNBs. More particularly, a macro cell makes the handover decision based on the measurements of the signal strength from its neighboring macro cells only. This handover mechanism does not take the signal strength of small cells into account and thus may not be able to take fully advantage of small cell deployment.
  • the proposed solutions are intended to address the above issues.
  • FIG. 3 is a block diagram showing an example of the primary eNB modules involved in the proposed solutions.
  • FIG. 3 shows the small cell/macro eNB modules and high-level inter-eNB interactions.
  • the eNBs (eNB 1 and eNB 2) each have a mobility management module, a signal processor, and a memory.
  • the inventive step features the mobility management module that is integrated into each eNB (macro and small cell).
  • Each eNB has a controller which operates the signal processor and mobility management module.
  • the information to be processed is stored in and retrieved from the memory.
  • a process initialization message originates from one of the eNBs, followed by subsequent information exchange and conclusion of mobility management reconfiguration.
  • the inter- eNB messaging is done via X2/Xn interfaces over backhaul links.
  • the internal processing of the mobility management module is depicted in FIG. 4. For example, they include receiving UE measurements, performing comparisons to determine optimal mobility anchor, initiating communication with neighbor eNB(s), mobility anchor transfer, and data transmission point transfer (if needed).
  • FIG. 6 receives UE measurements
  • FIG. 8 receives UE measurements
  • FIG. 9 receives UE measurements
  • FIG. 9 receives UE measurements
  • FIG. 8 performs a comparison between UE measurements from a mobile device
  • FIG. 9 for several specific network scenarios and applications.
  • FIG. 5 shows an example of a small cell dense deployment scenario, where a large number of small cells are deployed in the coverage of macro cells.
  • a UE has the capability of dual connectivity defined as follows: 1) the UE can connect to a macro eNB and a small cell eNB simultaneously, 2) the macro eNB handles the mobility management and all control signaling aspects while the small cell eNB is only used for data transmission, and 3) the downlink data from the core network first reaches the macro eNB and then are forwarded to the small cell eNB via the backhaul link.
  • FIG. 6 is a diagram illustrating an example of the handover procedure for throughput improvement as follows.
  • a UE sends measurement reports including the
  • RSRP Reference Signal Received Power
  • the serving macro eNB makes handover decision based on the measurement reports from the UE as follows. If the RSRP of a small cell eNB is larger than the RSRP of the serving small cell eNB, the serving macro eNB consider the small cell eNB with the larger RSRP as the new serving small cell eNB and hands over the UE to the target macro eNB (associated with the new serving small cell eNB), which is supposed to forward the data to the new serving small cell eNB. The serving macro eNB sends a HO preparation request to the target macro eNB.
  • the target macro eNB replies with a HO preparation request Acknowledgement (ACK).
  • ACK Acknowledgement
  • the source macro eNB sends a HO command to the UE and starts data forwarding to the target macro eNB.
  • the UE performs cell acquisition by sending a random access request to the target macro eNB.
  • the target macro eNB confirms the establishment of the connection by sending Uplink Grant (UG) and Timing Advance (TA).
  • UG Uplink Grant
  • TA Timing Advance
  • the UE sends the HO confirmation to the target macro eNB.
  • the UE sends the measurement reports including the Reference Signal Received Power (RSRP) from its serving eNBs and neighboring eNBs.
  • RSRP Reference Signal Received Power
  • the target macro eNB informs the UE of the new serving small cell via RRC signaling based on the received measurement reports, such that the UE can establish the connection to the small cell.
  • the proposed handover procedure can ensure that a dual- connectivity UE can always connect to a small cell which has the highest RSRP. Thus, the overall system throughput can be improved.
  • the UE is initially connected to macro eNB1 and small eNB1. If macro eNB1 figures out that the RSPR of small eNB2 is higher than that of small eNB1 based on the received measurement report, it will hand over the UE to macro eNB2, which is configured to forward downlink data form core network to small eNB2. After the UE is handed over to macro eNB2, macro eNB2 will instruct the UE to establish connection to small eNB2 via RRC signaling.
  • FIG. 7 A second example of a potential network scenario involving Coordinated Multi-Point (CoMP) transmission is shown in FIG. 7. It is assumed that the UE is capable of receiving data jointly from two serving cells, and that neighboring small cells have direct links to the core network to obtain UE downlink data from. Joint transmission is chosen as a non-limiting example, with other forms of CoMP transmission such as Dynamic Point Selection also being applicable.
  • FIG. 8 is a diagram illustrating an example of the handover procedure for throughput improvement involving CoMP transmission as follows.
  • a UE sends measurement reports including the
  • the neighboring eNBs include all macro eNBs and small cell eNBs in the neighborhood.
  • the serving macro eNB makes handover decision based on the measurement reports from the UE as follows. If the data rate achievable with joint transmission from neighboring small cell eNBs exceeds the current throughput of the serving small cell eNB by at least a predetermined threshold a, the serving macro eNB designates one of the neighbor small cell eNBs of the potential CoMP set as new serving small cell eNB and hands over the UE to the target macro eNB (associated with the new serving small cell eNBs), which acts as the new mobility anchor. The serving macro eNB sends a HO preparation request to the target macro eNB.
  • the target macro eNB replies with a HO preparation request Acknowledgement (ACK).
  • ACK Acknowledgement
  • the source macro eNB sends a HO command to the UE and starts data forwarding to the target macro eNB.
  • the UE performs cell acquisition by sending a random access request to the target macro eNB.
  • the target macro eNB confirms the establishment of the connection by sending Uplink Grant (UG) and Timing Advance (TA).
  • UG Uplink Grant
  • TA Timing Advance
  • the UE sends the HO confirmation to the target macro eNB.
  • the UE sends the measurement reports including the Reference Signal Received Power (RSRP) from its serving eNBs and neighboring eNBs.
  • RSRP Reference Signal Received Power
  • the target macro eNB informs the UE of the new serving small cell via RRC signaling based on the received measurement reports, such that the UE can establish the connection to the small cells.
  • the proposed handover procedure can ensure that a dual- connectivity UE can always transition to a transmission mode which has the highest throughput.
  • FIG. 9 is a diagram illustrating an example of the handover procedure to improve control signaling reliability as follows.
  • the basic idea of the proposed solution is to always choose the eNB with the highest RSRP as the mobility anchor, regardless of whether it is a macro eNB or small cell eNB.
  • a UE sends measurement reports to its serving eNB that serves as the mobility anchor.
  • the serving eNB chooses the mobility anchor based on the received measurement report. For example, it chooses the target eNB with the highest RSRP as the mobility anchor. It sends a Handover (HO) preparation request to the target eNB.
  • HO Handover
  • the target eNB replies with a HO preparation request Acknowledgement (ACK).
  • ACK Acknowledgement
  • the source eNB sends a HO command to the UE and starts data forwarding to the target eNB.
  • the UE performs cell acquisition by sending a random access request to the target eNB.
  • the target eNB confirms the establishment of the connection by sending Uplink Grant (UG) and Timing Advance (TA).
  • UG Uplink Grant
  • TA Timing Advance
  • the UE sends the HO confirmation to the target eNB to complete the whole handover process.
  • FIG. 10 shows an example of small cell dense deployment illustrating the proposed handover procedure to improve control signaling reliability.
  • a UE is moving from macro eNB1 towards macro eNB2.
  • Macro eNB1 , small eNB2, and macro eNB2 will be chosen as the mobility anchor in steps 1-3, respectively, based on the instantaneous RSRP values of those three cells, as the UE moves from macro eNB1 towards small eNB2 and then towards macro eNB2.
  • the communications system shown in FIGS. 5 and 7 and the functional block diagram illustrated in FIG. 3 are purely exemplary of systems in which the present invention may be implemented, and the invention is not limited to a particular hardware or software configuration.
  • the computers and storage systems implementing the invention can also have known I/O devices (e.g., CD and DVD drives, floppy disk drives, hard drives, etc.) which can store and read the modules, programs and data structures used to implement the above-described invention. These modules, programs and data structures can be encoded on such computer-readable media.
  • the data structures of the invention can be stored on computer- readable media independently of one or more computer-readable media on which reside the programs used in the invention.
  • the components of the system can be interconnected by any form or medium of digital data communication, e.g., a communication network. Examples of communication networks include local area networks, wide area networks, e.g., the Internet, wireless networks, storage area networks, and the like.
  • the methods When performed by software, the methods may be executed by a processor, such as a general purpose computer, based on instructions stored on a computer-readable medium. If desired, the instructions can be stored on the medium in a compressed and/or encrypted format.

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

Abstract

Un système de communication comprend une pluralité de cellules ayant une ou plusieurs macrocellules et une ou plusieurs petites cellules, un équipement d'utilisateur (UE), et un réseau via lequel les cellules et l'UE communiquent entre eux. Une cellule de la pluralité de cellules comprend une mémoire et un contrôleur, la cellule étant une cellule source qui sert de point d'ancrage de mobilité de l'UE pour gérer tous les signaux de commande de l'UE et recevoir un rapport de mesurage de l'UE. Le contrôleur de la cellule source peut être utilisé pour : choisir, d'après le rapport de mesurage, une cellule cible parmi la pluralité de cellules comme nouveau point d'ancrage de mobilité de l'UE ; envoyer une demande de préparation de transfert à la cellule cible ; recevoir un accusé de réception de demande de préparation de transfert, de la cellule cible ; et envoyer une commande de préparation de transfert à l'UE et débuter le transfert de données à la cellule cible.
PCT/US2013/067402 2013-10-30 2013-10-30 Gestion de mobilité pour un déploiement de petites cellules dans un système d'évolution à long terme Ceased WO2015065352A1 (fr)

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Cited By (3)

* Cited by examiner, † Cited by third party
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US20150289172A1 (en) * 2014-04-03 2015-10-08 Electronics And Telecommunications Research Institute Method and apparatus for transmitting data in heterogeneous network
CN107734574A (zh) * 2016-08-12 2018-02-23 华为技术有限公司 小区间切换的方法和控制器
CN109275158A (zh) * 2018-09-10 2019-01-25 中国联合网络通信集团有限公司 密集组网的方法及装置

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Publication number Priority date Publication date Assignee Title
US20110207485A1 (en) * 2010-02-22 2011-08-25 Konstantinos Dimou User Equipment, Radio Base Station and Methods Therein
US20120129522A1 (en) * 2010-11-24 2012-05-24 Sang Gook Kim Method of communicating data based on an unlicensed band in a wireless communication system
WO2012106798A1 (fr) * 2011-02-11 2012-08-16 Research In Motion Limited Transmission de canal d'accès aléatoire d'avance temporelle

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Publication number Priority date Publication date Assignee Title
US20110207485A1 (en) * 2010-02-22 2011-08-25 Konstantinos Dimou User Equipment, Radio Base Station and Methods Therein
US20120129522A1 (en) * 2010-11-24 2012-05-24 Sang Gook Kim Method of communicating data based on an unlicensed band in a wireless communication system
WO2012106798A1 (fr) * 2011-02-11 2012-08-16 Research In Motion Limited Transmission de canal d'accès aléatoire d'avance temporelle

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150289172A1 (en) * 2014-04-03 2015-10-08 Electronics And Telecommunications Research Institute Method and apparatus for transmitting data in heterogeneous network
CN107734574A (zh) * 2016-08-12 2018-02-23 华为技术有限公司 小区间切换的方法和控制器
CN107734574B (zh) * 2016-08-12 2020-12-01 华为技术有限公司 小区间切换的方法和控制器
US10917821B2 (en) 2016-08-12 2021-02-09 Huawei Technologies Co., Ltd. Inter-cell handover method and controller
CN109275158A (zh) * 2018-09-10 2019-01-25 中国联合网络通信集团有限公司 密集组网的方法及装置
CN109275158B (zh) * 2018-09-10 2021-09-14 中国联合网络通信集团有限公司 密集组网的方法及装置

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