WO2014090283A1 - Liaison radio à petite cellule liquide dans le dl pour le multiflux avec des réseaux hetnet - Google Patents

Liaison radio à petite cellule liquide dans le dl pour le multiflux avec des réseaux hetnet Download PDF

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Publication number
WO2014090283A1
WO2014090283A1 PCT/EP2012/075036 EP2012075036W WO2014090283A1 WO 2014090283 A1 WO2014090283 A1 WO 2014090283A1 EP 2012075036 W EP2012075036 W EP 2012075036W WO 2014090283 A1 WO2014090283 A1 WO 2014090283A1
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WO
WIPO (PCT)
Prior art keywords
cell
type cell
user equipment
network control
control element
Prior art date
Application number
PCT/EP2012/075036
Other languages
English (en)
Inventor
Subramanya C
Amaanat ALI
Matthias HESSE
Karol Drazynski
Original Assignee
Nokia Solutions And Networks Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nokia Solutions And Networks Oy filed Critical Nokia Solutions And Networks Oy
Priority to PCT/EP2012/075036 priority Critical patent/WO2014090283A1/fr
Publication of WO2014090283A1 publication Critical patent/WO2014090283A1/fr

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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
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0027—Control or signalling for completing the hand-off for data sessions of end-to-end connection for a plurality of data sessions of end-to-end connections, e.g. multi-call or multi-bearer end-to-end data connections
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/04—Reselecting a cell layer in multi-layered cells
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/15—Setup of multiple wireless link connections

Definitions

  • the present invention relates to an apparatus, a method and a computer program product for optimizing multiflow configuration in a heterogeneous network.
  • Some embodiments of the present invention relate to multiflow in heterogenous networks, i.e., in networks in which macro cells (having a large coverage area) and small cells (having a small coverage are) are present.
  • 3GPP has currently an ongoing Rel 11 work item called "HSDPA Multiflow Tx" (later in the document referred to as “multiflow”), where the cell edge users' burst rates are improved by instantaneously receiving transmissions also from neighbouring cells.
  • HSDPA Multiflow Tx an ongoing Rel 11 work item
  • multiflow the cell edge users' burst rates are improved by instantaneously receiving transmissions also from neighbouring cells.
  • Multiflow can be configured in heterogeneous networks (HetNets).
  • HetNets heterogeneous networks
  • a certain macro cell can be paired with a small cell like pico or micro cell in a multiflow configuration.
  • an apparatus which comprises a connection unit configured to provide a connection to a communication network, and a processor configured to control a plurality of network control elements comprising at least a first network control element controlling a first type cell and a second network control element controlling a second type cell, the second type cell having a smaller coverage area than the first type cell, to configure the first network control element to operate the first type cell as a serving cell in a multiflow configuration with respect to a user equipment, and to configure the second network control element to operate the second type cell exclusively as an assisting cell in the multiflow configuration with respect to the user equipment.
  • an apparatus which comprises a connection unit configured to provide a connection to a communication network, and a processor configured to serve a second type cell, the second type cell having a smaller coverage area than a first type cell, wherein a multiflow configuration is applied in which the first type cell operates as a serving cell, and to operate the second type cell exclusively as an assisting cell in the multiflow configuration with respect to the user equipment.
  • a method is provided which comprises
  • controlling a plurality of network control elements comprising at least a first network control element controlling a first type cell and a second network control element controlling a second type cell, the second type cell having a smaller coverage area than the first type cell,
  • the first network control element configuring the first network control element to operate the first type cell as a serving cell in a multiflow configuration with respect to a user equipment
  • the second network control element configuring the second network control element to operate the second type cell exclusively as an assisting cell in the multiflow configuration with respect to the user equipment.
  • a method which comprises
  • the second type cell having a smaller coverage area than a first type cell, wherein a multiflow configuration is applied in which the first type cell operates as a serving cell, and
  • a computer program product comprising code means for performing a method according to any one of the third and fourth aspects or their modifications when run on a processing means or module.
  • the computer program product may be embodied on a computer-readable medium.
  • an optimization of a multiflow configuration in a heterogenous network scenario is achieved, so that handovers to small cell are reduced and the DL throughput boost provided by multiflow is leveraged.
  • Fig. 1 shows an exemplary HetNet scenario with a moving UE and current multiflow re-configuration points
  • Fig. 2 illustrates a simplified structures of an RNC and Node Bs involved in a multiflow configuration according to an embodiment of the present invention
  • Fig. 3 shows an exemplary HetNet scenario with a moving UE and reconfigurations happening according to an algorithm according to an embodiment of the present invention.
  • Mobility procedure execution requirements are designed for macro cell scenarios. For small cells, procedure execution time requirements are shorter (the reason being the quite small radius of a small cell compared to macro inter site distance e.g. 40-60 m to 1000 m respectively). General requirement on mobility procedure execution for small cells are approximately 10 times higher than the macro cells. If the density of small cells is large, then this has huge counter productive impacts to RAN performance and KPIs (this may also cause failed handovers and call drops). Hence, handover procedure execution times (including measurement at UE and serving cell change from RAN) should meet the stringent delay requirements when looked at from the small cell perspective.
  • Fig. 1 shows an exemplary HetNet scenario with a moving UE and current Multiflow re-configuration points.
  • the scenario comprises a first macro cell (Macro 1) and a second macro cell (Macro 2).
  • a pico cell Within an overlapping area of the two macro cells, a pico cell (Pico) is provided.
  • UE user equipment
  • Procedure to reconfigure the small cell as the serving cell and the macro cell as assisting cell (when small cell Ec/No becomes better and better and the macro cell signal level drops as UE moves along the drawn arrow). This is the situation at point 2 in Fig. 1.
  • the signaling and reconfiguration amount is very high and can be optimized by means of this invention.
  • the high signaling load generated by those frequent reconfigurations would be very problematic in real networks with widely deployed small cells and hundreds of UEs. It is the outcome of Multiflow procedures being designed to serve reconfigurations between Macro cells only and not with HetNet deployments in mind.
  • the small cells are not optimized for DL throughput and some of their potential may be wasted.
  • the load on the small cells is not minimized to allow sufficient room for non-multiflow users who have small cell as HSPA serving cell.
  • Fig. 2 shows an RNC 21 controlling two Node Bs 22 and 23, of which the Node Bs 22 serves a macro cell and the Node B 23 serves a small cell.
  • Fig. 2 shows an RNC 21 as an example for an apparatus applying an embodiment of the present invention.
  • the RNC is only an example, and also other suitable network elements could be applied.
  • the apparatus may also be only a part of the network element such as the RNC.
  • the RNC 21 comprises a processor 211 and a connection unit 212.
  • the connection unit 212 is configured to provide a connection to a communication network.
  • the processor 211 is configured to control a plurality of network control elements comprising at least a first network control element (e.g., Node B 22) controlling a first type cell (e.g., a macro cell) and a second network control element (e.g., Node B 23) controlling a second type cell (e.g., a small cell), the second type cell having a smaller coverage area than the first type cell, to configure the first network control element to operate the first type cell as a serving cell in a multiflow configuration with respect to a user equipment, and to configure the second network control element to operate the second type cell exclusively as an assisting cell in the multiflow configuration with respect to the user equipment.
  • a first network control element e.g., Node B 22
  • a second network control element e.g., Node B 23
  • a second type cell e
  • the Node B 23 is an example for an apparatus serving a second type cell (e.g., a small cell) according to an embodiment of the present invention. Similar as in case of the RNC, the Node B 23 is also only an example, and can be replaced by another suitable network control element. In particular, the apparatus may only be a part of the Node B 23.
  • the Node B 23 comprises a processor 231 and connection unit 232.
  • the connection unit 232 is configured to provide a connection to a communication network.
  • the processor 231 is configured to serve a second type cell (e.g., a small cell), the small cell having a smaller coverage area than the first type cell, wherein a multiflow configuration is applied in which the first type cell operates as a serving cell, and to operate the second type cell exclusively as an assisting cell in the multiflow configuration with respect to the user equipment.
  • a second type cell e.g., a small cell
  • the Node B 22 is an example for an apparatus serving a first type cell (e.g., a macro cell) according to an embodiment of the present invention. Similar as in case of the RNC, the Node B 22 is also only an example, and can be replaced by another suitable network control element. In particular, the apparatus may only be a part of the Node B 22.
  • the Node B 22 comprises a processor 221 and connection unit 222.
  • the connection unit 222 is configured to provide a connection to a communication network.
  • the processor 221 is configured to serve a first type cell, to operate the first type cell as a serving cell in a multiflow configuration with respect to a user equipment, wherein a second type cell (e.g., a small cell) is also involved in the multiflo configuration, wherein the second type cell operates exclusively as a assisting cell in the multiflow configuration and has a smaller coverage area than the first type cell.
  • a second type cell e.g., a small cell
  • the RNC 21, the Node B 22 and the Node B23 respectively may further comprise memories 213, 223 and 233 for storing data and programs, by means of which the respective processors 211, 221 and 231 may carry out their corresponding functions.
  • the second type cell (the small cell) is always operated as an assisting cell. In this way, any signaling re-configurations can be avoided which would be necessary when the the second type cell would also be operated as a serving cell in the multiflow configuration.
  • the multiflow configuration is a configuration in which transmission of data to the user equipment is carried out by multiple cells, possibly including the macro cell and the small cell.
  • the second type cell (e.g., the small cell) has a smaller coverage area than the first type cell (e.g., the macro cell), as mentioned above, and may be located fully or partly within the first type cell.
  • the small cell described above can be a pico or micro cell, for example.
  • the serving cell in a multiflow configuration means, for example, a cell holding the HS-DSCH serving cell role for the user equipment, whereas the assisting cell is a cell in the same frequency, where the UE is configured to simultaneously monitor a HS-SCCH set and receive HS- DSCH if it is scheduled in that cell.
  • the small cell shall always be configured as a multiflow assisting cell throughout the area where a multiflow connection can be maintained.
  • the small cell is never reconfigured from its multiflow assisting role in any of the following conditions:
  • the multiflow serving cell role is passed from one macro cell to other, when serving cell role needs to be changed.
  • the small cell shall never take the role of the serving cell, not even for a short period of time.
  • a handover to a small cell is done only when no macro cell is available for the serving cell role and current macro serving cell radio link is lost. That is, a handover to a small cell is only carried out as failsafe measure when the radio connection of the user equipment could be lost.
  • a small cell should not be considered for serving cell role (the macro cell is always the anchor). That is, the RRM algorithm in RNC shall ensure that a current multiflow macro serving cell shall retain its serving role even if the UE reports the small cell with a better Ec/No, for example.
  • Periodic/event triggered measurement reports have to be monitored to check if any macro cell has replaced the current multiflow serving cell as the second best cell.
  • the multiflow serving cell role of a macro cell is changed when another macro becomes the second best cell. This is performed even if the small cell is the best cell according to the measurement report.
  • Control of whether a handover is allowed or not can be performed by the RNC.
  • the above algorithm is not used if the UE goes out of the small cell coverage. That is, the algorithm is only applied when the UE is in the coverage area of a small cell or a small cell becomes available.
  • Fig. 3 illustrates an exemplary HetNet scenario with a moving UE and re-configurations happening according to the algorithm according to the present embodiment.
  • the basic scenario is similar as in Fig. 1 described above, that is, the movement of an UE from a first macro cell (served, e.g., by Node B 22 shown in Fig. 2) to a second macro cell (served, e.g., by a Node B similar to Node B 22 of Fig. 2) via a pico cell (served, e.g., by Node B 23 shown in Fig. 2) is considered.
  • a pico cell servinged, e.g., by Node B 23 shown in Fig. 2
  • the above described algorithm according to the present embodiment is applied.
  • the pico cell will be configured as assisting cell, while the first macro cell (Macro 1) still keeps the role of the serving cell.
  • the pico cell is still configured as the assisting cell, while now the second macro cell (Macro 2) will be configured as the serving cell (replacing the first macro cell).
  • Multiflow signalling is optimized in the given deployment scenario.
  • RAN processing and air interface resources are saved e.g. savings in hardware processing resources in RNC/BTS/UE, air interface capacity benefit etc. For instance, signaling savings of at least 50% could be appreciated in the scenarios depicted above, as instead of two reconfigurations only one is carried out (only macro- > macro reconfiguration, instead of macro- >small + small->macro).
  • the solution according to the above embodiments can be applied in all variants of Multiflow and HetNet deployments, e.g., DF-DC, SF-DC etc.
  • the solution according to the above embodiments will provide more benefits in a DF-DC kind of environment where multiflow is configured for macro and small cell with different frequencies.
  • the near-far effect - the need for the UE to be heard by the far-away macro while not drowning the UL of the small cell in interference - for intra-frequency configurations will limit the scenarios where a complete HO to the small cell can be avoided.
  • Certain range-extension methods are being considered in other work, which would increase the share of UEs that can benefit from simultaneous links to a small and a macro cell.
  • the small cell may not be configured as serving cell in any multiflow configuration where there is also a macro cell, the actual scheduling taking place in the small cell may prioritize the multiflow users to leverage the better radio conditions in the small cell.
  • the RNC can get aware of whether a cell should be treated as small cell or macro cell for example by including corresponding information as a part of cell setup.
  • the RNC is a separate element which controls the different Node Bs.
  • the RNC is a separate element which controls the different Node Bs.
  • a configuration is possible in which one of the Node Bs involved carries out the function of the RNC.
  • a pico cell was described.
  • any kind of small cell such as pico or micro cell or the like
  • any kind of small cell can be applied, as long as the coverage area thereof is smaller than that of the macro cell and is within the macro cell.
  • the multiflow configuration includes one macro cell as the serving cell and one pico cell as the assisting cell.
  • a plurality of assisting cell which may be small cells but may also include macro cells.
  • the user equipment using the multiflow configuration is prioritized over a user equipment not using a multiflow configuration within the small cell (second type cell).
  • the RNC RRM it was described that, when a user equipment is handed over to a small cell (when the radio link might get lost), the user equipment using the multiflow configuration is prioritized over a user equipment not using a multiflow configuration within the small cell (second type cell).
  • an apparatus which comprises
  • means for controlling a plurality of network control elements comprising at least a first network control element controlling a first type cell and a second network control element controlling a second type cell, the second type cell having a smaller coverage area than the first type cell,
  • an apparatus which comprises
  • an access technology via which signaling is transferred to and from a network element may be any technology by means of which a network element or sensor node can access another network element or node (e.g. via a base station or generally an access node).
  • Any present or future technology such as WLAN (Wireless Local Access Network), WiMAX (Worldwide Interoperability for Microwave Access), LTE, LTE-A, Bluetooth, Infrared, and the like may be used; although the above technologies are mostly wireless access technologies, e.g. in different radio spectra, access technology in the sense of the present invention implies also wired technologies, e.g. IP based access technologies like cable networks or fixed lines but also circuit switched access technologies; access technologies may be distinguishable in at least two categories or access domains such as packet switched and circuit switched, but the existence of more than two access domains does not impede the invention being applied thereto,
  • stations and transmission nodes may be or comprise any device, apparatus, unit or means by which a station, entity or other user equipment may connect to and/or utilize services offered by the access network; such services include, among others, data and/or (audio-) visual communication, data download etc. ;
  • a user equipment or communication network element may be any device, apparatus, unit or means by which a system user or subscriber may experience services from an access network, such as a mobile phone or smart phone, a personal digital assistant PDA, or computer, or a device having a corresponding functionality, such as a modem chipset, a chip, a module etc., which can also be part of a UE or attached as a separate element to a UE, or the like;
  • any method step is suitable to be implemented as software or by hardware without changing the idea of the invention in terms of the functionality implemented;
  • MOS Metal Oxide Semiconductor
  • CMOS Complementary MOS
  • BiMOS Bipolar MOS
  • BiCMOS Bipolar CMOS
  • ECL emitter Coupled Logic
  • TTL Transistor-Transistor Logic
  • ASIC Application Specific IC
  • FPGA Field-programmable Gate Arrays
  • CPLD Complex Programmable Logic Device
  • DSP Digital Signal Processor
  • - devices, units or means can be implemented as individual devices, units or means, but this does not exclude that they are implemented in a distributed fashion throughout the system, as long as the functionality of the device, unit or means is preserved;
  • an apparatus may be represented by a semiconductor chip, a chipset, or a (hardware) module comprising such chip or chipset; this, however, does not exclude the possibility that a functionality of an apparatus or module, instead of being hardware implemented, be implemented as software in a (software) module such as a computer program or a computer program product comprising executable software code portions for execution/being run on a processor;
  • a device may be regarded as an apparatus or as an assembly of more than one apparatus, whether functionally in cooperation with each other or functionally independently of each other but in a same device housing, for example.

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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 appareil et un procédé, selon lesquels une pluralité d'éléments de commande de réseau sont commandés comprenant au moins un premier élément de commande de réseau commandant une cellule d'un premier type et un second élément de commande de réseau commandant une cellule d'un second type, la cellule du second type ayant une aire de couverture inférieure à celle de la cellule du premier type, le premier élément de commande de réseau est configuré pour actionner la cellule du premier type comme cellule serveuse dans une configuration multiflux par rapport à un équipement utilisateur, et le second élément de commande de réseau est configuré pour actionner la cellule de second type exclusivement comme cellule assistante dans la configuration multiflux par rapport à l'équipement utilisateur.
PCT/EP2012/075036 2012-12-11 2012-12-11 Liaison radio à petite cellule liquide dans le dl pour le multiflux avec des réseaux hetnet WO2014090283A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2012/075036 WO2014090283A1 (fr) 2012-12-11 2012-12-11 Liaison radio à petite cellule liquide dans le dl pour le multiflux avec des réseaux hetnet

Applications Claiming Priority (1)

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PCT/EP2012/075036 WO2014090283A1 (fr) 2012-12-11 2012-12-11 Liaison radio à petite cellule liquide dans le dl pour le multiflux avec des réseaux hetnet

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WO2014090283A1 true WO2014090283A1 (fr) 2014-06-19

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CN108353332A (zh) * 2015-11-04 2018-07-31 三菱电机株式会社 通信系统
US10667208B2 (en) 2015-12-23 2020-05-26 Huawei Technologies Co., Ltd. Communication method and device

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Publication number Priority date Publication date Assignee Title
CN108353332A (zh) * 2015-11-04 2018-07-31 三菱电机株式会社 通信系统
JPWO2017078057A1 (ja) * 2015-11-04 2018-08-23 三菱電機株式会社 通信システム
EP3373651A4 (fr) * 2015-11-04 2019-05-29 Mitsubishi Electric Corporation Système de communication
US10624002B2 (en) 2015-11-04 2020-04-14 Mitsubishi Electric Corporation Communication system
CN108353332B (zh) * 2015-11-04 2021-08-10 三菱电机株式会社 通信系统
US10667208B2 (en) 2015-12-23 2020-05-26 Huawei Technologies Co., Ltd. Communication method and device

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