EP2772092A2 - Sélection de cellules basée sur la polarisation pour des équipements utilisateurs centrés sur les liaisons montantes - Google Patents

Sélection de cellules basée sur la polarisation pour des équipements utilisateurs centrés sur les liaisons montantes

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Publication number
EP2772092A2
EP2772092A2 EP12783179.0A EP12783179A EP2772092A2 EP 2772092 A2 EP2772092 A2 EP 2772092A2 EP 12783179 A EP12783179 A EP 12783179A EP 2772092 A2 EP2772092 A2 EP 2772092A2
Authority
EP
European Patent Office
Prior art keywords
cell
user equipment
uplink
biasing
biasing parameter
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP12783179.0A
Other languages
German (de)
English (en)
Inventor
Nitin MANGALVEDHE
Rapeepat Ratasuk
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia Solutions and Networks Oy
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
Publication of EP2772092A2 publication Critical patent/EP2772092A2/fr
Withdrawn legal-status Critical Current

Links

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
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/0085—Hand-off measurements
    • H04W36/0094—Definition of hand-off measurement parameters
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/302—Reselection being triggered by specific parameters by measured or perceived connection quality data due to low signal strength

Definitions

  • This invention relates generally to radio access networks and, more specifically, relates to cell selection in radio access networks.
  • zone eNB access points or remote radio units home eNBs, femto cells, pico-cells, remote radio heads, or additional names
  • a single controller which might be called zone eNB controller, central control unit, home eNB Gateway, eNB gateway, or additional names
  • a macro-cell might provide coverage based on a higher power output over a larger area, where there are multiple smaller cells (with correspondingly smaller power output) within this larger coverage area.
  • the smaller cells might be controlled by a single controller.
  • HetNet heterogeneous network
  • HetNet may also refer to any combination of larger and smaller cells with overlapping coverage.
  • users within the smaller cells share data resources amongst a smaller set of users and typically the HetNet configuration can provide higher capacity and a faster network overall.
  • cell selection process is in favor of the best downlink cell. That is, a user equipment (a wireless device) connected to the HetNet performs downlink measurements from the various cells within the HetNet and typically selects and attaches to the cell having the best downlink measurement. This typical scenario may not be the best scenario for all user equipment in the environment.
  • Similar problems may exist in wireless systems in general. For instance, if there is a mixture of macro- and micro- cells with different transmission powers, a user equipment will typically connect to the macro-cell based on the higher transmission power of the macro-cell. That is, the user equipment performs downlink measurements from the various micro-cells (and the macro cell) and selects and attaches to the cell having the best downlink measurement. The best measurement in many instances is the macro cell. This typical scenario may not be the best scenario for all user equipment in the environment.
  • a method includes communicating wirelessly from a cell to user equipment a biasing parameter to be used by the user equipment to select and attach to a cell for uplink-centric communications with the selected cell.
  • a further exemplary embodiment is a computer program comprising program code for executing the method of the previous paragraph.
  • Another exemplary embodiment is the computer program according to this paragraph, wherein the computer program is a computer program product comprising a computer-readable medium bearing computer program code embodied therein for use with a computer.
  • An exemplary apparatus includes one or more processors and one or more memories including computer program code.
  • the one or more memories and the computer program code are configured to, with the one or more processors, cause the apparatus to perform at least the following: communicating wirelessly from a cell to user equipment a biasing parameter to be used by the user equipment to select and attach to a cell for uplink-centric communications with the selected cell.
  • Another exemplary embodiment is an apparatus that comprises means for communicating wirelessly from a cell to user equipment a biasing parameter to be used by the user equipment to select and attach to a cell for uplink-centric communications with the selected cell.
  • An exemplary computer program product includes a computer-readable medium bearing computer program code embodied therein for use with a computer, the computer program code including: code for communicating wirelessly from a cell to user equipment a biasing parameter to be used by the user equipment to select and attach to a cell for uplink-centric communications with the selected cell.
  • a method in another exemplary embodiment, includes receiving wirelessly at a user equipment a biasing parameter for uplink-centric
  • An additional exemplary embodiment is a computer program comprising program code for executing the method of the previous paragraph.
  • Another exemplary embodiment is the computer program according to this paragraph, wherein the computer program is a computer program product comprising a computer-readable medium bearing computer program code embodied therein for use with a computer.
  • An exemplary apparatus includes one or more processors and one or more memories including computer program code.
  • the one or more memories and the computer program code are configured to, with the one or more processors, cause the apparatus to perform at least the following: receiving wirelessly at a user equipment a biasing parameter for uplink-centric communications from individual ones of a plurality of cells; and selecting and attaching to one of the plurality of cells for uplink-centric communications based on the received biasing parameter.
  • An exemplary computer program product includes a computer-readable medium bearing computer program code embodied therein for use with a computer, the computer program code including: code for receiving wirelessly at a user equipment a biasing parameter for uplink-centric communications from individual ones of a plurality of cells; and code for selecting and attaching to one of the plurality of cells for uplink-centric communications based on the received biasing parameter.
  • Yet another exemplary embodiment is a method comprising: determining, at a cell able to wirelessly communicate with user equipment, user equipment that have uplink-centric communications; calculating a biasing parameter for uplink-centric communications; sending the calculated biasing parameter to one or more neighbor cells; receiving a corresponding biasing parameter from each of the one or more neighbor cells; and for the user equipment that were determined to have uplink-centric communications, handing over the user equipment from the cell to one of the one or more neighbor cells based on at least the calculated biasing parameter, the received biasing parameters, and handover measurement reports from the user equipment for each of the cell and the one or more neighbor cells.
  • a further exemplary embodiment is a computer program comprising program code for executing the method of the previous paragraph.
  • Another exemplary embodiment is the computer program according to this paragraph, wherein the computer program is a computer program product comprising a computer-readable medium bearing computer program code embodied therein for use with a computer.
  • An exemplary apparatus includes one or more processors and one or more memories including computer program code.
  • the one or more memories and the computer program code are configured to, with the one or more processors, cause the apparatus to perform at least the following: determining, at a cell able to wirelessly communicate with user equipment, user equipment that have uplink-centric
  • An exemplary computer program product includes a computer-readable medium bearing computer program code embodied therein for use with a computer, the computer program code including: determining, at a cell able to wirelessly communicate with user equipment, user equipment that have uplink-centric communications; calculating a biasing parameter for uplink-centric communications; sending the calculated biasing parameter to one or more neighbor cells; receiving a corresponding biasing parameter from each of the one or more neighbor cells; and for the user equipment that were determined to have uplink-centric communications, handing over the user equipment from the cell to one of the one or more neighbor cells based on at least the calculated biasing parameter, the received biasing parameters, and handover measurement reports from the user equipment for each of the cell and the one or more neighbor cells.
  • FIG. 1 is a diagram of a heterogeneous network (HetNet) used to illustrate cell selection.
  • HetNet heterogeneous network
  • FIG. 2 is a block diagram of an exemplary system in which the exemplary embodiments may be practiced.
  • FIG. 3 is a table of exemplary uplink user throughput gain for configuration
  • FIG. 4 is a table of exemplary uplink user throughput gain for configuration
  • FIG. 5 is an exemplary method performed by a cell (e.g., performed by a base station such as an eNB in the cell) for cell selection based on biasing for uplink- centric user equipment.
  • FIG. 6 is an exemplary method performed by a user equipment for cell selection based on biasing for uplink-centric user equipment.
  • FIG. 7 is another exemplary method performed by a cell (e.g., performed by a base station such as an eNB in the cell) for cell selection based on biasing for uplink- centric user equipment.
  • a cell e.g., performed by a base station such as an eNB in the cell
  • E-UTRAN also referred to as UTRAN-LTE, universal terrestrial radio access network-long term evolution, or as E-UTRA
  • 3GPP third generation partnership project
  • 3GPP TS technical standard 36.300, V8.12.0 (2010-04), "3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Access Network (E-UTRAN); Overall description; Stage 2 (Release 8).
  • LTE Rel-8 This system may be referred to for convenience as LTE Rel-8 (which also contains 3G HSPA, third generation high speed packet access, and its improvements).
  • 3GPP TS 36.xyz e.g., 36.21 1 , 36.31 1 , 36.312, etc.
  • Release 9 (Rel-9) versions of these specifications have been published, including 3GPP TS 36.300, V9.7.0 (201 1 -3).
  • Release 10 (Rel-10) versions of these specifications have also been published, including 3GPP TS 36.300, V10.4.0 (201 1-06). Work on Rel- 1 1 is ongoing and should be finished sometime in 2012 for RAN1 (physical layer).
  • Rel-12 work has not started as of the drafting of this disclosure, but studies are currently proceeding for what will be included in Rel-12.
  • communication systems for user equipment e.g., wireless devices communicating at least over cellular frequencies
  • these releases contain describe implementation details for user equipment and the communication systems.
  • Machine-type communications are also referred to as Machine-to-Machine (M2M) communications.
  • M2M Machine-to-Machine
  • One characteristic of machine-to-machine (M2M) UEs is that traffic is mostly in the uplink direction.
  • the best downlink cell may not be the best uplink cell. It is proposed herein that a biasing parameter to be used for MTC UEs in order to be attached to the best uplink cell for those UEs.
  • a mixture of, e.g., macro- cells, pico-cells, femto-cells, and relay cells are deployed.
  • the macro-cell enjoys a 25-30 dB gain in downlink (DL, from a base station to a user equipment) signal strength (e.g., RSRP, reference symbol received power) compared to the DL signal strength of a low-power node such as pico-cell, femto-cell, or relay cell for the same path loss, due to the high transmit power and antenna gain of the macro-cell.
  • RSRP reference symbol received power
  • a user equipment (UE) will attach to the best DL cell.
  • the best DL cell may not be the best UL (uplink, from a user equipment to a base station) cell due to the power bias toward the macro-cell (as described in more detail below).
  • M2M Machine-to-Machine
  • MTC machine-type communication
  • traffic is mostly in the uplink direction.
  • MTC UE examples include UEs for video surveillance, traffic monitoring, and real-time sensing.
  • MTC communication can require high uplink data rate and generally smaller downlink data rate compared to the uplink data rate.
  • FIG. 1 shows a typical heterogeneous deployment with an overlay macro- cell 230-1 (a coverage area created, e.g., by eNB 220-1 shown in FIG. 2) and underlay pico-cell (a coverage area created, e.g., by eNB 220-2 shown in FIG. 2).
  • the power of the macro-cell is 46 dBm (decibels (dB) of measured power referenced to one milliwatt (mW)) with an antenna gain of 17 dBi (decibel isotropic), while the pico-cell transmission power is only 30 dBm with antenna gain of 5 dBi.
  • dB decibels
  • mW milliwatt
  • uplink-centric herein
  • uplink performance is degraded due to the larger path loss to the macro-cell.
  • the UE will generate large amount of interference to the pico-cell.
  • FIG. 2 shows a block diagram of an exemplary system in which the exemplary embodiments may be practiced.
  • a UE 1 10 is in wireless communication with a radio network 100.
  • the user equipment 1 10 includes one or more processors 120, one or more memories 125, and one or more transceivers 130 interconnected through one or more buses 127.
  • the one or more transceivers 130 are connected to one or more antennas 128.
  • the one or more memories 125 include computer program code 123.
  • the one or more memories 125 and the computer program code 123 are configured to, with the one or more processors 120, cause the user equipment 1 10 to perform one or more of the operations as described herein.
  • the UE 1 10 communicates with eNB 220-1 via link A (e.g., eNB 220-1 could be the base station for the macro-cell 230-1 in FIG. 1 ) and communicates with eNB 220-2 via link B (e.g., eNB 220-2 could be the base station for the pico-cell 230-2 shown in FIG. 1 ).
  • link A e.g., eNB 220-1 could be the base station for the macro-cell 230-1 in FIG. 1
  • link B e.g., eNB 220-2 could be the base station for the pico-cell 230-2 shown in FIG. 1
  • FIG. 2 only two base stations are shown in FIG. 2, this is merely exemplary, and more than two base stations may suitably be used.
  • the radio network 100 includes two eNBs 220-1 , 220-2 in this example.
  • Each eNB 220 includes one or more processors 150, one or more memories 155, one or more network interfaces (N/W l/F(s)) 161 , and one or more transceivers 160
  • the one or more transceivers 160 are connected to one or more antennas 158.
  • the one or more memories 155 include computer program code 153.
  • the one or more memories 155 and the computer program code 153 are configured to, with the one or more processors 150, cause a corresponding one of the eNBs 220 to perform one or more of the operations as described herein.
  • the one or more network interfaces 161 communicate over a network such as the network 175.
  • the eNBs 220 communicate using, e.g., network 175.
  • the network 175 may be wired or wireless or both and may implement, e.g., an X2 interface.
  • the computer readable memories 125 and 155 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, flash memory, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory.
  • the processors 120 and 150 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) and processors based on a multi-core processor architecture, as non- limiting examples.
  • the various embodiments of the user equipment 1 10 can include, but are not limited to, cellular telephones such as smart phones, personal digital assistants (PDAs) having wireless communication capabilities, portable computers having wireless communication capabilities, image capture devices such as digital cameras having wireless communication capabilities, gaming devices having wireless
  • cellular telephones such as smart phones
  • PDAs personal digital assistants
  • portable computers having wireless communication capabilities
  • image capture devices such as digital cameras having wireless communication capabilities
  • gaming devices having wireless
  • music storage and playback appliances having wireless communication capabilities
  • Internet appliances permitting wireless Internet access and browsing, tablets with wireless communication capabilities, as well as portable units or terminals that incorporate combinations of such functions.
  • MTC UEs and other uplink-centric UEs traffic is mostly in the uplink direction with very little downlink traffic.
  • downlink traffic in general is addressed to a group of MTC UEs and may be best served using broadcast services (e.g., using MBSFN, multi-media broadcast over a single frequency network, transmissions).
  • MBSFN multi-media broadcast over a single frequency network, transmissions.
  • MTC UEs and other uplink-centric UEs
  • MTC UEs may not be best served when they connect to the strongest downlink cell. Instead, the MTC UEs should attach to the best uplink cell. This can be performed in several ways:
  • a biasing parameter is implemented on the cells for MTC UEs. This is similar to the factor being introduced to offload UEs from the over-lay to the under-lay and also for UEs to attach to relay cells. However, in this case, the biasing parameter is used for MTC UEs to attach to the best cell in terms of uplink performance. This will require some knowledge of the power and gain difference between cells which can be obtained as part of network planning or higher-layer self-optimization procedure.
  • the serving cell can compute the pathloss and received power difference between the serving cell and neighboring cells as reported by the UEs as part of handover measurement.
  • the serving cells can then handoff the MTC UEs to the best uplink cells. This will require some knowledge of the power and gain difference between cells which can be obtained as part of network planning or higher-layer self-optimization procedure. This procedure will incur some overhead as handovers are needed. Since MTC UEs will generally be in an idle state and will perform cell selection as part of connection establishment every time uplink data are sent, this can introduce significant overhead and delay.
  • the UEs will attach to the best uplink cell. However, the UE will need knowledge of the power and gain difference between cells. This is not possible prior to attachment unless this knowledge is provided or preconfigured in the UEs as part of an advanced network planning.
  • MTC UEs are preconfigured to attach only to certain cells. This requires extensive planning and does not guarantee attachment to the best uplink serving cell. Furthermore, for MTC UEs with mobility (e.g., vehicular telemetry), this will not work.
  • a biasing parameter be implemented on the cells for MTC UEs due to the simplicity in implementation of the biasing parameter and having the network in control of the process.
  • Rel-12 and pre-Rel-12 (e.g., Rel-8/9) communications are handled differently.
  • the biasing parameter could be part of a PHY broadcast parameter, similar to the factor being used to offload traffic or for relay attachment.
  • the biasing factor will typically only apply to MTC UEs (i.e., UEs that are preconfigured to apply this factor).
  • MTC UEs On the UE side, MTC UEs will be preconfigured to receive this parameter and thus would be required to apply this parameter in the cell selection procedure.
  • Non- MTC UEs can choose to ignore this parameter but may take the parameter into consideration in the cell selection procedure as well.
  • each cell broadcasts an MTC selection biasing parameter, T-II M2M, for MTC user equipment.
  • T-II M2M MTC selection biasing parameter
  • an MTC UE adds a value of the biasing parameter from each cell to its DL measurements and attaches to the cell with the highest adjusted value.
  • the biasing parameter is determined to adjust the relative bias for selection of cells so that MTC UEs select a cell having a better pathloss in uplink for data transmissions than the pathloss for other potential cells.
  • the biasing parameter, T-II M2M is determined from several factors and can be updated slowly. As an example, the biasing parameter may be determined and updated based on one or more of the following system parameters:
  • the biasing parameter is determined to adjust the relative bias for selection of cells so that MTC UEs select a cell having a better pathloss in uplink for data transmissions than the pathloss for other potential cells.
  • the downlink EI RP difference may be between a measured EIRP of a cell and a reference value, e.g., set by an operator and sent to/received by an eNB.
  • the biasing parameter may be adjusted, e.g., inversely proportional to the difference in downlink EIRP.
  • the reference value is the EI RP of the macro-cell
  • the EI RP of a pico-cell would be lower than the reference value, which means the difference between the EI RP of the pico-cell and the reference value would be negative.
  • Resource utilization factor e.g. the average percentage of resource blocks being used over time
  • bias is inversely proportional to resource utilization factor; the higher the resource utilization, the lower the bias.
  • MTC traffic priority - bias is used to balance MTC traffic with other types of traffic (e.g., voice over Internet protocol, VoIP; file transfer protocol, FTP; hypertext transfer protocol, HTTP); if the bias is increased, then MTC traffic is emphasized.
  • voice over Internet protocol VoIP
  • file transfer protocol FTP
  • hypertext transfer protocol HTTP
  • System load e.g., number of active M2M and other UEs
  • bias is inversely proportional to the system load; the higher the system load, the lower the bias.
  • Average MCS (modulation and coding scheme) level - bias is proportional to the average UL MCS level for all UEs in the cell.
  • the biasing parameter can be initialized as follows:
  • T-II M2M 0 for macro-cell
  • T-II M 2M 0 for pico-cell
  • ⁇ l M2M,k(i+1 ) ai M 2M,k(i) + $II *MI N(1 , ain3 ⁇ 4,n*(3 ⁇ 4,n-$IWn)) dB (decibels),
  • a k,n are weighting factors
  • ⁇ - ⁇ ⁇ represents summation over n terms
  • ⁇ - ⁇ is an adaptation step-size parameter.
  • the ⁇ - ⁇ is what is often called a step-size parameter.
  • This parameter limits the change in biasing parameter, i.e., the step-size parameter determines the maximum step size. If it is desirable to have the biasing parameter react slowly to the system changes, then the step-size parameter can be set to a small value.
  • the MI N() function also helps to limit the change in biasing parameter per iteration.
  • macro-cells and pico-cells are described above, there may be other adjustments for other cells.
  • femto-cells may have an initialization different from (or the same as) the macro-cells and pico-cells and their own set of relevant system parameters.
  • the relevant system parameters may vary between cells (e.g., a macro-cell may implement different relevant system
  • each pico-cell independently calculates and updates the biasing parameter according to the exemplary equation given above. Note that all the factors in the equation pertain to that cell alone.
  • This biasing parameter is broadcast to M2M UEs, which incorporate the parameters into their measurements when determining to which cell to attach. There is no need for cells to share this biasing parameter or coordinate in any manner, although sharing the parameter is not restricted.
  • Uplink performance results using 3GPP Case 1 and heterogeneous simulation configurations 4a and 4b are shown in FIGS. 3 and 4, respectively, using simulation assumptions in 3GPP TR 36.814, "E-UTRA; Further Advancements for E- UTRA Physical Layer Aspects", v9.0.0, 2010-03.
  • Configurations 4a and 4b are UE dropping configurations specified for system simulations. These are described in Table A.2.1.1.2-4 of TR 36.814. Pages 59-69 of 3GPP TR 36.814 include Tables A.2.1.2-1 through A.2.1.2-8.
  • 3GPP Case 1 is 500m (meters) ISD (inter-site distance), 30 MTC UEs per macro-cell, with two UEs placed near each pico-cell, and the remaining UEs placed randomly within the macro-cell.
  • 3GPP Case 1 is 500m ISD, 30 MTC UEs per macro-cell, with 20 UEs placed near pico-cells, and 10 UEs placed randomly within the macro-cell. From the results, it is seen that the gain increases as the number of pico-cells increases due to more users being attached to the pico-cells.
  • FIG. 5 this figure is an exemplary method performed by a cell 230 (e.g., performed by a base station such as an eNB 220 in the cell 230) for cell selection based on biasing for uplink-centric user equipment.
  • eNB 220-1 in FIG. 2 may perform the blocks of FIG. 5 by executing computer program code 153-1 on processor(s) 150-1 , which causes the eNB 220-1 to perform the blocks.
  • the cell 230 calculates a biasing parameter for uplink-centric communications.
  • Uplink-centric communications are those that are primarily uplink-based (e.g., relative to downlink communications). More specifically, the following are several examples one can use to define uplink-centric communications (or correspondingly an uplink-centric UE):
  • [0049] Based on the number of scheduled subframes. For a given time period, divide the number of scheduled new uplink subframes by the number of new downlink subframes. If the ratio is greater than a threshold (e.g., 4.0), then declare the UE as uplink-centric and its communications as uplink-centric.
  • a threshold e.g., 4.0
  • the eNB Based on the number of data requests (e.g., initiations) by the UE.
  • the eNB has information about whether the UE or the network is initiating transmission and can collect this information.
  • uplink-centric Based on explicit classification by the operator.
  • the operator can just classify some UEs as uplink-centric (similar to how MTC/M2M UEs will be classified).
  • uplink-centric is circumvented and it will be up to the operator to use the operator's own criteria.
  • the biasing parameter is to be used by user equipment 1 10 having uplink- centric communications to select and attach to a cell 230 for communications with the selected cell.
  • the uplink-centric user equipment are those supporting machine-type communications and, e.g., especially those specifically preconfigured to use the biasing parameter and to have uplink-centric communications (e.g., machine-type
  • the cell wirelessly communicates the biasing parameter for the uplink-centric communications to the uplink-centric user equipment 1 10.
  • the communication includes broadcasting the biasing parameter (e.g., such that all user equipment in the cell receive the biasing parameter).
  • FIG. 6 is an exemplary method performed by a user equipment 1 10 for cell selection based on biasing for uplink-centric user equipment.
  • the user equipment 1 10 may perform the actions in FIG. 6 by executing the computer program code 123 on the processor(s) 120.
  • the user equipment 1 10 receives an indication of a biasing parameter for uplink-centric communications from individual ones of a multitude of cells 230.
  • the user equipment 1 10 can receive the biasing parameter from each of the eN Bs 220 (each of which creates a suitable cell 230).
  • the user equipment 1 10 selects and attaches to one of the multitude of cells 230 for uplink-centric
  • the user equipment 1 10 can apply the received biasing parameter to
  • the biasing parameter T-II M2 M is calculated by each cell and exchanged to other neighbor cells in, e.g., a neighbor list.
  • Each cell will implement the bias internally and handoff uplink-centric (e.g., MTC) UEs with uplink-heavy traffic to another cell based on UE handover measurement reports and the known internal biases of nearby cells.
  • uplink-centric e.g., MTC
  • a macro-cell maintains ⁇ - ⁇ ⁇ 2 ⁇ , ⁇ , T-II M2M , 2 , T-II M2M ,3 for 3 pico-cells in the area. Together with UE RSRP measurements from those cells, the macro-cell decides whether to handoff to pico-cells. Each pico-cell also does the same calculation so UEs are not handed back to the macro-cell. That is, a cell adds a value of the biasing parameter for itself and its neighbor cells to UE RSRP measurements and selects the cell with the highest adjusted value. The cell then hands off the UE to the selected cell (if the selected cell is not the cell performing the addition and selection).
  • Biasing parameter adaptation may be performed as previously described.
  • Whether a UE is uplink-centric may be identified based on, e.g., a unique ID (identification) provisioned by the operators (e.g., operators may be told the M2M IDs so the operators know which UEs are M2M, or the operators can reserve a certain block of IDs for M2M UEs), or a traffic pattern observed by a scheduler at the eNB of that user equipment's traffic pattern (e.g., larger uplink traffic than downlink traffic).
  • the term "uplink-centric" is used herein to mean that a UE has mostly uplink data to transmit.
  • the amount of uplink data compared to the amount of downlink data may be used as criteria to determine an uplink-centric UE, as can, e.g., the number of uplink data packets compared to downlink data packets.
  • an uplink-centric UE will have significantly more uplink than downlink transmission.
  • FIG. 7 is another exemplary method performed by a cell (e.g., performed by a base station such as an eNB in the cell) for cell selection based on biasing for uplink-centric user equipment.
  • the example of FIG. 7 is performed, e.g., by a base station such as an eNB 220.
  • the base station determines user equipment that have uplink-centric communications. Such a determination could be performed, as described above, by using a unique ID identifying a user equipment 1 10 as an MTC user equipment, or by examining uplink and downlink traffic patterns for a user equipment and making the uplink-centric communication determination based thereon.
  • the base station calculates a biasing parameter for uplink-centric
  • Blocks 730-740 are an example of an exchanging process, where the cell and its cells (e.g., in a neighbor cell list for the cell) exchange calculated bias parameters.
  • the base station sends the calculated biasing parameter to one or more neighbor cells.
  • the eNB 220-1 could send its calculated biasing parameter to eNB 220-2.
  • the base station receives a corresponding biasing parameter from each of the one or more neighbor cells.
  • the eNB 220-1 could receive a calculated biasing parameter from eNB 220-2.
  • the base station for the user equipment that were determined to have uplink-centric communications, hands over the user equipment from the cell to one of the one or more neighbor cells based on at least the calculated biasing parameter and the received biasing parameters.
  • the base station can apply the received biasing parameter to corresponding ones of handover measurement reports (made by the user equipment and sent to the base station) for neighbor cells 230 and compare these adjusted values with a value of its calculated biasing parameter and its handover measurement report (made by the user equipment and sent to the base station). If one of the adjusted values from the neighbor cells is greater than the adjusted value from the base station, the base station then selects the neighbor cell 230 having the highest adjusted value and hands off the user equipment 1 10 to that neighbor cell 230.
  • a method including: communicating wirelessly from a cell to uplink-centric user equipment a biasing parameter to be used by the uplink-centric user equipment to select and attach to a cell for uplink-centric communications with the selected cell.
  • N N system metrics of the cell
  • a n weighting factors
  • ⁇ - ⁇ ⁇ represents summation over n terms
  • ⁇ - ⁇ is an adaptation step-size parameter
  • N is one or more.
  • preconfigured to use the biasing parameter are not uplink-centric user equipment and do not use the biasing parameter to select and attach to a cell.
  • communicating wirelessly further comprises broadcasting the biasing parameter to the uplink-centric user equipment.
  • a method comprising: receiving wirelessly at an uplink-centric user equipment a biasing parameter for uplink-centric communications from individual ones of a plurality of cells; and selecting and attaching to one of the plurality of cells for uplink- centric communications based on the received biasing parameters.
  • selecting further comprises: for each of the plurality of cells, adding a corresponding biasing parameter to a value of a corresponding downlink measurement for the cell to create an adjusted value; and selecting a cell based on which one of the plurality of cells has a corresponding highest adjusted value; and attaching further comprises attaching to the selected cell.
  • a method comprising:
  • handing over further comprises handing over user equipment from the cell to one of the one or more neighbor cells based on at least the calculated biasing parameter, the received biasing parameters, and handover measurement reports from the user equipment for each of the cell and the one or more neighbor cells.
  • corresponding biasing parameter to a value of a corresponding handover measurement report for the cell to create an adjusted value; selecting a cell based on which one of the plurality of cells has a corresponding highest adjusted value; and in response to the selected cell being one of the one or more neighbor cells, handing over the user equipment from the cell to the selected one of the one or more neighbor cells.
  • determining user equipment that have uplink-centric communications further comprises determining the user equipment have uplink-centric communications based on unique identification provided for the user equipment.
  • determining user equipment that have uplink-centric communications further comprises determining the user equipment have uplink-centric communications based on traffic patterns of the user equipment.
  • determining the traffic patterns of the user equipment further comprise a predetermined significantly higher amount of uplink traffic as compared to downlink traffic for the user equipment determined to have uplink- centric communications.
  • Embodiments herein may be implemented in software (executed by one or more processors), hardware (e.g., an application specific integrated circuit), or a combination of software and hardware.
  • the software e.g., application logic, an instruction set
  • a "computer-readable medium” may be any media or means that can contain, store, communicate, propagate or transport the instructions for use by or in connection with an instruction execution system, apparatus, or device, such as a computer, with one example of a computer described and depicted, e.g., in FIG. 2.
  • a computer-readable medium may comprise a computer- readable storage medium (e.g., memories 125, 155 or other device) that may be any media or means that can contain or store the instructions for use by or in connection with an instruction execution system, apparatus, or device, such as a computer.
  • a computer- readable storage medium e.g., memories 125, 155 or other device
  • the different functions discussed herein may be performed in a different order and/or concurrently with each other. Furthermore, if desired, one or more of the above-described functions may be optional or may be combined.

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

Abstract

La présente invention concerne un procédé consistant à communiquer, à partir d'une cellule, à des équipements utilisateurs, un paramètre de polarisation devant être utilisé par les équipements utilisateurs pour sélectionner et se rattacher à une cellule pour des communications centrées sur les liaisons montantes avec la cellule sélectionnée. Les équipements utilisateurs qui reçoivent le paramètre de polarisation peuvent (par exemple, s'ils sont préconfigurés pour utiliser le paramètre) sélectionner et se rattacher à l'une d'un certain nombre de cellules pour des communications centrées sur les liaisons montantes sur la base du paramètre de polarisation. Un autre procédé consiste à déterminer, au niveau d'une cellule, les équipements utilisateurs ayant des communications centrées sur les liaisons montantes, calculer un paramètre de polarisation pour les communications centrées sur les liaisons montantes, envoyer le paramètre de polarisation calculé à la (aux) cellule(s) voisine(s), et recevoir un paramètre de polarisation correspondant de chacune de la ou des cellules voisines. Pour les équipements utilisateurs qui ont été déterminés comme ayant des communications centrées sur les liaisons montantes, les équipements utilisateurs sont transférés à partir de la cellule vers l'une de la ou des cellules voisines sur la base des paramètres de polarisation calculés et reçus. L'invention concerne également des dispositifs, des logiciels et des produits de programmes.
EP12783179.0A 2011-10-26 2012-10-26 Sélection de cellules basée sur la polarisation pour des équipements utilisateurs centrés sur les liaisons montantes Withdrawn EP2772092A2 (fr)

Applications Claiming Priority (2)

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US201161551611P 2011-10-26 2011-10-26
PCT/EP2012/071199 WO2013060807A2 (fr) 2011-10-26 2012-10-26 Sélection de cellules basée sur la polarisation pour des équipements utilisateurs centrés sur les liaisons montantes

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EP2772092A2 true EP2772092A2 (fr) 2014-09-03

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Publication number Priority date Publication date Assignee Title
US20140302853A1 (en) * 2012-11-30 2014-10-09 Telefonaktiebolaget L M Ericsson (Publ) Network node, user equipment, methods therein, computer programs and computer-readable storage mediums to expand or shrink a coverage area of a cell
US9374774B2 (en) * 2012-12-18 2016-06-21 Qualcomm Incorporated WAN-WLAN cell selection in UEs
CN106717072B (zh) 2014-09-02 2019-10-22 华为技术有限公司 无线网络中小区选择的方法、基站和用户设备
US10038544B2 (en) 2015-12-09 2018-07-31 Qualcomm Incorporated Multiple access for users with different modes in a common uplink burst in a time division duplex subframe structure

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090286563A1 (en) * 2008-05-15 2009-11-19 Qualcomm Incorporated Method and apparatus for using virtual noise figure in a wireless communication network
WO2011044945A1 (fr) * 2009-10-16 2011-04-21 Nokia Siemens Networks Oy Procédé d'équilibrage des charges dans un système de communication radio et appareil associé

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2397469B (en) * 2003-01-20 2006-05-17 Motorola, Inc Method and apparatus for cell biasing in a cellular communication system
US8185060B2 (en) * 2008-04-22 2012-05-22 Qualcomm Incorporated Serving base station selection using backhaul quality information
US20100267386A1 (en) * 2009-04-17 2010-10-21 Qualcomm Incorporated Methods and apparatus for facilitating handoff between a femtocell base station and a cellular base station
WO2011123755A1 (fr) * 2010-04-02 2011-10-06 Interdigital Patent Holdings, Inc. Procédures de groupe pour dispositifs de communication du type machine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090286563A1 (en) * 2008-05-15 2009-11-19 Qualcomm Incorporated Method and apparatus for using virtual noise figure in a wireless communication network
WO2011044945A1 (fr) * 2009-10-16 2011-04-21 Nokia Siemens Networks Oy Procédé d'équilibrage des charges dans un système de communication radio et appareil associé

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2013060807A2 *

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