WO2010105693A1 - Réduction des interférences entre une cellule de réseau local et une cellule de réseau longue distance - Google Patents

Réduction des interférences entre une cellule de réseau local et une cellule de réseau longue distance Download PDF

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Publication number
WO2010105693A1
WO2010105693A1 PCT/EP2009/053314 EP2009053314W WO2010105693A1 WO 2010105693 A1 WO2010105693 A1 WO 2010105693A1 EP 2009053314 W EP2009053314 W EP 2009053314W WO 2010105693 A1 WO2010105693 A1 WO 2010105693A1
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Prior art keywords
area cell
wide area
local area
communication resources
transmission
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PCT/EP2009/053314
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English (en)
Inventor
Mieszko Chmiel
Jürgen MICHEL
Agnieszka Szufarska
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Nokia Siemens Networks Oy
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Priority to PCT/EP2009/053314 priority Critical patent/WO2010105693A1/fr
Publication of WO2010105693A1 publication Critical patent/WO2010105693A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks
    • H04W16/16—Spectrum sharing arrangements between different networks for PBS [Private Base Station] arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H04W84/045—Public Land Mobile systems, e.g. cellular systems using private Base Stations, e.g. femto Base Stations, home Node B

Definitions

  • the present invention relates to an apparatus, method, system and computer program product for reducing interference between a local area cell and a wide area cell.
  • Prior art which is related to this technical field can e.g. be found by the technical specifications TS 36.211 (current version: 8.6.0), TR 25.820 (current version: 8.2.0) and TS 22.220 (current version: 1.0.1) of the 3GPP, by the contributions document R4-081345, document R4-0701494, and document R4-082338 of the working group 4 of the 3GPP related to radio access networks, and by the contribution document Rl-083661, and document Rl-084035 of the working group 1 of the 3GPP related to radio access networks.
  • BCCH Broadcast Control Channel
  • DMRS Demodulation Reference Signal
  • eNB Evolved NodeB
  • HeNB Home eNodeB
  • LA Local Area
  • LTE-A LTE-Advanced
  • OFDM Orthogonal Frequency-Division Multiplexing
  • PRACH Physical Random Access Channel
  • PRB Physical Resource Block
  • PUCCH Physical Uplink Control Channel
  • PUSCH Physical Uplink Shared Channel
  • SINR Signal-to-Noise Ratio
  • UE User Equipment
  • WCDMA Wideband Code Division Multiple Access
  • eNBs which in the following are called Home eNodeBs
  • Home eNodeBs these nodes can be operated at the same frequency layer, i.e. the same carrier frequency in the same frequency band, as a wide area eNB.
  • a similar situation is provided by general small nodes with local services and/or CSG applied, and which are under an overlay wide area macro network operated on the same frequency layer.
  • nodes such as these HeNBs that they are low cost and in general deployed in indoor environment. In terms of radio network planning, the deployment is in most cases uncoordinated so the exact position where the HeNBs are located is not known to the operator.
  • HeNBs may support either any nearby UE or only UEs belonging to a single closed subscriber group (CSG) . Therefore, HeNBs may be seen as additional interfering nodes with no possibility of handover for UEs not belonging to the supported CSG. This makes it reasonable to limit the HeNB transmission power to provide indoor coverage, which typically is 5, 10 MHz and 20 MHz for the LTE deployments with a transmission power smaller than or equal to 20 dBm.
  • the HeNB shall be able to use a range of frequency bands according to an operator's needs, and a relevant scenario for radio investigations there is that the frequency band of operation shall be different from the frequency band used by the macro layer. Though, this approach has one major disadvantage which is the need for an operator to have an additional band/frequency carrier for HeNB operation .
  • FIG. 1 A table with an example link budget for LA HeNB communication in a residential house located near the WA cell edge is shown below. As can be seen in the example, the scenario depicted in Fig. 1 results in an unacceptably low SINR at the LA HeNB due to the high interference of the visiting WA UE, which is not included in the HeNB CSG.
  • an apparatus comprising an identifying processor configured to identify a wide area cell of a wide area overlay macro communication network transmitting the highest signal strength, and to identify a communication resources configuration used in a transmission of the wide area cell; and a determining processor configured to determine a communication resources configuration for use in a local area cell using a same access protocol as the wide area cell, wherein the communication resources configuration for use in the local area cell is determined different from the communication resources configuration used in the transmission of the wide area cell such that interference between the transmission of the wide area cell and a transmission of the local area cell is reduced.
  • Modifications of the first aspect may be as follows.
  • the apparatus according to the first aspect may be configured to be suitable for reducing interference between a local area cell and a wide area cell.
  • the communication resources configuration for use in a local area cell can be an uplink communication resources configuration for use in a local area cell.
  • the apparatus may further comprise a transmission controller configured to control communication in the local area cell such that it is based on the communication resources configuration for use in the local area cell.
  • the apparatus may further comprise a set of hardware configured to provide a base station functionality for the local area cell.
  • the base station functionality can be provided by software run on a general purpose digital signal processor and/or application specific integrated circuits.
  • the base station functionality may provide the functionality of a Node B or an evolved Node B.
  • the identifying processor may be further configured to provide information on the identified wide area cell transmitting the highest signal strength and the communication resources configuration used in a transmission of the wide area cell for submission to a local area cell central element, and the determining processor may be further configured to provide the communication resources configuration for use in the local area cell for submission to the local area cell central element, and to receive an acknowledgement from the local area cell central element on the communication resources configuration for use in the local area cell.
  • the communication resources configuration used in a transmission of the wide area cell may comprise a wide area cell identity and an uplink reference signal configuration from a broadcast control channel of the transmission of the wide area cell, and the uplink reference signal configuration from a broadcast control channel may include one or more from the group comprising enabled group hopping, enabled sequence hopping, and a sequence shift pattern .
  • the communication resources configuration used in a transmission of the wide area cell may comprise resources used for a physical random access channel of the transmission of the wide area cell, and the communication resources configuration for use in the local area cell may comprise resources which are orthogonal to the resources used for a physical random access channel of the transmission of the wide area cell.
  • the communication resources configuration used in a transmission of the wide area cell may comprise resources used for a physical uplink control channel of the transmission of the wide area cell, and the communication resources configuration for use in the local area cell may comprise selection of physical resource blocks for a physical uplink control channel of a transmission of the local area cell over which the physical uplink control channel is not transmitted in the wide area cell.
  • the identifying processor may be further configured to identify the wide area cell of an wide area overlay macro communication network transmitting the highest signal strength, and to identify the communication resources configuration used in a transmission of the wide area cell based upon receipt of a high interference indicator informing on physical resource blocks scheduled for use in the wide area cell.
  • an apparatus comprising means for identifying a wide area cell of a wide area overlay macro communication network transmitting the highest signal strength, and for identifying a communication resources configuration used in a transmission of the wide area cell; and means for determining a communication resources configuration for use in a local area cell using a same access protocol as the wide area cell, wherein the communication resources configuration for use in the local area cell is determined different from the communication resources configuration used in the transmission of the wide area cell such that interference between the transmission of the wide area cell and a transmission of the local area cell is reduced.
  • Modifications of the second aspect may correspond to the modifications of the first aspect.
  • the above object is accomplished by a system, comprising the apparatus according to the first aspect modified by the identifying processor being further configured to provide information on the identified wide area cell transmitting the highest signal strength and the communication resources configuration used in a transmission of the wide area cell for submission to a local area cell central element, and the determining processor being further configured to provide the communication resources configuration for use in the local area cell for submission to the local area cell central element, and to receive an acknowledgement from the local area cell central element on the communication resources configuration for use in the local area cell; and the local area cell central element comprising a checking processor configured to acknowledge the communication resources configuration for use in the local area cell, and to reject the communication resources configuration for use in the local area cell.
  • the system according to the third aspect may be configured to be suitable for reducing interference between a local area cell and a wide area cell.
  • the determining processor may be further configured to provide another communication resources configuration for use in the local area cell for submission to the local area cell central element, if no acknowledgement from the local area cell central element is received.
  • the local area cell central element may further comprise one of an operation and maintenance functionality and a gateway functionality.
  • an apparatus comprising a checking processor configured to acknowledge a communication resources configuration for use in a local area cell, and to reject the communication resources configuration for use in the local area cell.
  • Modifications of the fourth aspect may be as follows.
  • the apparatus according to the fourth aspect may be configured to be suitable for reducing interference between a local area cell and a wide area cell.
  • the apparatus may be implemented as a local area cell central element.
  • the apparatus or the local area cell central element may further comprise one of an operation and maintenance functionality and a gateway functionality.
  • an apparatus comprising a means for acknowledging a communication resources configuration for use in a local area cell, and means for rejecting the communication resources configuration for use in the local area cell.
  • Modifications of the fifth aspect may correspond to the modifications of the fourth aspect.
  • the above object is accomplished by a system, comprising the apparatus according to the second aspect modified by identifying means being further configured to provide information on the identified wide area cell transmitting the highest signal strength and the communication resources configuration used in a transmission of the wide area cell for submission to a local area cell central element, and determining means being further configured to provide the communication resources configuration for use in the local area cell for submission to the local area cell central element, and to receive an acknowledgement from the local area cell central element on the communication resources configuration for use in the local area cell; and the apparatus according to the fifth aspect or any of its modifications .
  • the above object is accomplished by a method, comprising identifying a wide area cell of an wide area overlay macro communication network transmitting the highest signal strength; identifying a communication resources configuration used in a transmission of the wide area cell; and determining a communication resources configuration for use in a local area cell using a same access protocol as the wide area cell, wherein the communication resources configuration for use in the local area cell is determined different from the communication resources configuration used in the transmission of the wide area cell such that interference between the transmission of the wide area cell and a transmission of the local area cell is reduced.
  • Modifications of the seventh aspect may be as follows.
  • the method according to the seventh aspect may be configured to be suitable of reducing interference between a local area cell and a wide area cell.
  • the identifying may be performed by an identifying processor and the determining may be performed by a determining processor.
  • the communication resources configuration for use in a local area cell may be an uplink communication resources configuration for use in a local area cell.
  • the method may further comprise controlling communication in the local area cell such that it is based on the communication resources configuration for use in the local area cell.
  • the controlling may be performed by a transmission controller .
  • the method may further comprise providing a base station functionality for the local area cell.
  • the base station functionality may be provided by a set of hardware. Alternatively or in combination, the base station functionality can be provided by software run on a general purpose digital signal processor and/or application specific integrated circuits.
  • the base station functionality may provide the functionality of a Node B or an evolved Node B.
  • the method may further comprise providing information on the identified wide area cell transmitting the highest signal strength and the communication resources configuration used in a transmission of the wide area cell for submission to a local area cell central element; providing the communication resources configuration for use in the local area cell for submission to the local area cell central element; and receiving an acknowledgement from the local area cell central element on the communication resources configuration for use in the local area cell.
  • the providing information may be performed by the identifying processor, and the providing the communication resources configuration and the receiving may be performed by the determining processor.
  • the communication resources configuration used in a transmission of the wide area cell may comprise a wide area cell identity and an uplink reference signal configuration from a broadcast control channel of the transmission of the wide area cell, and the uplink reference signal configuration from a broadcast control channel may include one or more from the group comprising enabled group hopping, enabled sequence hopping, and a sequence shift pattern .
  • the communication resources configuration used in a transmission of the wide area cell may comprise resources used for a physical random access channel of the transmission of the wide area cell, and the communication resources configuration for use in the local area cell may comprise resources which are orthogonal to the resources used for a physical random access channel of the transmission of the wide area cell.
  • the communication resources configuration used in a transmission of the wide area cell may comprise resources used for a physical uplink control channel of the transmission of the wide area cell, and the communication resources configuration for use in the local area cell may comprise selection of physical resource blocks for a physical uplink control channel of a transmission of the local area cell over which the physical uplink control channel is not transmitted in the wide area cell.
  • the method may further comprise identifying the wide area cell of an wide area overlay macro communication network transmitting the highest signal strength; and identifying the communication resources configuration used in a transmission of the wide area cell based upon receipt of a high interference indicator informing on physical resource blocks scheduled for use in the wide area cell. Both identifying may be performed by the identifying processor .
  • the method may further comprise acknowledging or rejecting the communication resources configuration for use in the local area cell by the local area cell central element.
  • the method may further comprise providing another communication resources configuration for use in the local area cell for submission to the local area cell central element, if no acknowledgement from the local area cell central element is received.
  • the providing may be performed by the determining processor .
  • the method may further comprise providing one of an operation and maintenance functionality and a gateway functionality by the local area cell central element.
  • the above object is accomplished by a computer program product comprising computer-executable components which perform, when the program is run on a computer identifying a wide area cell of an wide area overlay macro communication network transmitting the highest signal strength; identifying a communication resources configuration used in a transmission of the wide area cell; and determining a communication resources configuration for use in a local area cell using a same access protocol as the wide area cell, wherein the communication resources configuration for use in the local area cell is determined different from the communication resources configuration used in a transmission of the wide area cell such that interference between a transmission of the wide area cell and a transmission of the local area cell is reduced.
  • the computer program product according to the eighth aspect may be configured to be suitable for reducing interference between a local area cell and a wide area cell.
  • the computer program product according to the eighth aspect may be embodied as a computer-readable storage medium.
  • modifications of the eighth aspect may correspond to the modifications of the seventh aspect. It is to be understood that any of the above modifications can be applied singly or in combination to the respective aspects to which they refer, unless they are explicitly stated as excluding alternatives.
  • Fig. 1 shows uplink interference at a home evolved Node B which is located close to a wide area cell edge;
  • Fig. 2 shows an example for the signaling flow according to certain embodiments of the present invention
  • Fig. 3 shows the usage of PUCCH parameters for normal cyclic prefix according to document Rl-083661;
  • Fig. 4 shows a PUCCH resource partitioning for a wide area and local area co-channel case according to certain embodiments of the present invention;
  • Fig. 5 shows a principle configuration of an apparatus according to certain embodiments of the present invention.
  • Fig. 6 shows a principle flowchart of a method according to certain embodiments of the present invention.
  • interference reduction between a 3GPP LTE overlay wide area macro network and a 3GPP LTE local area network is described.
  • these exemplary embodiments are not limited for use among these particular types of wireless communication systems, and according to further exemplary embodiments, the present invention can be applied also to other types of communication systems and access networks such as e.g. to WLAN (wireless local area network) and WIMAX (worldwide interoperability for microwave access) techniques and standards.
  • WLAN wireless local area network
  • WIMAX worldwide interoperability for microwave access
  • certain embodiments of the present invention are related to auto-configuration of small hotspots and low transmission power eNBs which are in the following called Home eNodeBs (HeNBs) and the case where these nodes are operated at the same frequency layer, i.e. at the same carrier frequency in the same frequency band, as the wide area eNBs .
  • HeNBs Home eNodeBs
  • the present invention is not limited to HeNB, but other embodiments of the present invention are related to general small nodes with local services and/or CSG applied, and which are under an overlay wide area macro network operated on the same frequency layer .
  • Fig. 5 shows a principle configuration of an apparatus according to certain embodiments of the present invention. That is, as shown in Fig. 5, an apparatus comprises an identifying processor 51 configured to identify a wide area cell of a wide area overlay macro communication network transmitting the highest signal strength, and to identify a communication resources configuration used in a transmission of the wide area cell; and a determining processor 52 configured to determine a communication resources configuration for use in a local area cell using a same access protocol as the wide area cell, wherein the communication resources configuration for use in the local area cell is determined different from the communication resources configuration used in the transmission of the wide area cell such that interference between the transmission of the wide area cell and a transmission of the local area cell is reduced.
  • an identifying processor 51 configured to identify a wide area cell of a wide area overlay macro communication network transmitting the highest signal strength, and to identify a communication resources configuration used in a transmission of the wide area cell
  • a determining processor 52 configured to determine a communication resources configuration for use in a local area cell using a same access protocol as the wide area
  • a method comprises identifying 61 a wide area cell of an wide area overlay macro communication network transmitting the highest signal strength; identifying 62 a communication resources configuration used in a transmission of the wide area cell; and determining 63 a communication resources configuration for use in a local area cell using a same access protocol as the wide area cell, wherein the communication resources configuration for use in the local area cell is determined different from the communication resources configuration used in the transmission of the wide area cell such that interference between the transmission of the wide area cell and a transmission of the local area cell is reduced.
  • the identifying a wide area cell transmitting a highest signal strength and the identifying a communication resources configuration used in a transmission of the wide area cell can be performed by the identifying processor 51 shown in Fig. 5, while the determining a different communication resources configuration for use in a local area cell can be performed by the determining processor shown in Fig . 5.
  • Fig. 2 shows an example for the signaling flow in case a centralized network element for HeNB parameter management is available.
  • the uplink reference symbols are distributed in time and take consecutive resource elements in the frequency domain.
  • UL RS uplink reference symbols
  • DMRS Demodulation reference signal
  • SRS Sounding Reference Signal
  • the UL RS as currently specified by the 3GPP, is defined by a cyclic shift of one of 30 base sequence groups. Each group contains one or two base sequences depending on the allocated UL PRBs (c.f. document TS 36.211) .
  • the UL RS sequences to be used in a cell are defined by:
  • a group hopping pattern which depends on the cell ID; there are 17 such patterns (derived from the cell ID) and this hopping can be enabled or disabled by higher layers on a cell basis.
  • a sequence shift pattern there are 30 such patterns derived from the cell ID for PUCCH DMRS and for the PUSCH DMRS. This pattern can be additionally offset by higher layers.
  • a base sequence within a group can hop according to sequence hopping. This hopping is enabled or disabled by higher layers signaling and can be used only if group hopping is disabled (the base sequence hopping pattern is linked to the cell ID and PUSCH DMRS configuration) .
  • the HeNB is enabled by a corresponding configuration of one or more of its components to listen to a BCCH of a wide area call, to identify the wide area cell's UL RS configuration, and to autonomously or in coordination with other local area cells via apparatuses such as a femto gateway or a central parameter management network element select its UL RS configuration so that its base sequence group hopping pattern (if enabled) and/or sequence shift pattern (and sequence hopping pattern if applied) will differ compared to the corresponding configuration of the WA eNB.
  • apparatuses such as a femto gateway or a central parameter management network element select its UL RS configuration so that its base sequence group hopping pattern (if enabled) and/or sequence shift pattern (and sequence hopping pattern if applied) will differ compared to the corresponding configuration of the WA eNB.
  • a typical procedure comprises one or more of the following processes :
  • a UE receiver which may be either camped/connected to a certain HeNB or integrated with a certain HeNB listens and identifies the strongest WA cell.
  • the WA cell ID and the UL RS configuration are identified from the BCCH (Group-hopping-enabled, ⁇ ss , Sequence-Hopping Enabled, ⁇ DMRS r see document TS 36.211) .
  • the HeNB determines its own cell ID (and ⁇ S s, DMRS ) and assures that WA and LA base sequence group hopping patterns and/or sequence shift pattern and/or sequence hopping pattern are different, thus minimizing the mutual UL RS cross-correlation and interference.
  • the HeNB uses (controls) the chosen UL RS configurations for UL transmission of its UEs.
  • the HeNB may report to a central element, e.g. an O&M center or a femto gateway, the strongest measured WA cell (e.g. physical cell ID) together with a proposal for its own cell ID and a proposal for its UL RS configuration, and gets an acknowledgement (ACK) from the central element.
  • a central element e.g. an O&M center or a femto gateway
  • the strongest measured WA cell e.g. physical cell ID
  • ACK acknowledgement
  • the HeNB suggests new and different values for its own physical cell ID and the UL RS configuration, or the central element signals appropriate values.
  • the physical random access channel is transmitted over six resource blocks in a sub-frame or set of sub-frames reserved for random access preamble transmissions as described e.g. in document TS 36.211.
  • the PRACH frequency allocation (the first PRB of the six PRACH PRBs) is adjustable and signaled over the BCCH by each cell (the n ⁇ ⁇ et parameter in document TS 36.211) .
  • the PRACH can carry a lot of energy, especially at the WA cell edge due to open loop power control. This particular effect may significantly lower the HeNB performance.
  • the HeNB obtains the WA PRACH location and chooses a different, non-overlapping location for its own PRACH transmissions.
  • the HeNB obtains the time domain configuration of the WA eNB and selects a different, non-overlapping time domain PRACH configuration. It is to be noted that in a high UL WA interference case, the interference mitigation procedure by selecting different PRACH preamble sequence parameters like an orthogonal cyclic shift or a different Zadoff-Chu root sequence index might be not sufficient due to the high dynamic range between the interferer and the wanted signal.
  • a typical procedure comprises one or more of the following processes :
  • a UE receiver which may be either camped/connected to a certain HeNB or integrated with a certain HeNB listens and identifies the strongest WA cell and its resources used for PRACH .
  • the HeNB autonomously chooses own orthogonal (in time or frequency) PRACH resources as described above.
  • a UE trying to access WA and LA in the same geographical area transmits (is controlled to transmit) the PRACH over different orthogonal resources.
  • the HeNB may report to a central element such as e.g. an O&M center or a femto gateway the strongest measured WA cell (e.g. physical cell ID) and its PRACH allocation as well as the own cell ID and the chosen PRACH allocation, and then gets an acknowledgement (ACK) from the central element.
  • ACK acknowledgement
  • the HeNB can suggest new and different values or the central element can signal appropriate values.
  • the PUCCH is located at band edges, but the exact configuration of these regions may differ for different base stations. If both WA UEs and LA UEs use the same physical resource blocks for PUCCH transmissions it is likely that a HeNB located near to a WA cell edge is not able to decode the content properly.
  • a mechanism for reducing adjacent channel interference due to PUCCH transmission has already been proposed e.g. in documents Rl-083661 and Rl-084035, and is referred to as PUCCH blanking or over-provisioning.
  • this concept is modified to avoid co-channel PUCCH interference.
  • the HeNB could signal that more PRBs are allocated for PUCCH, but schedule (allow) PUCCH transmissions only over resources which are not used by WA UEs for PUCCH transmission.
  • Fig. 3 shows the usage of PUCCH parameters for normal cyclic prefix according to document Rl-083661.
  • N ⁇ denotes the number of RBs that are reserved for CQI transmission
  • PUCCH denotes a dedicated CQI resource in terms of CS for a UE
  • N ⁇ denotes the number of CS used for SRI /HARQ-ACK in a mixed RB, where CQI and SRI /HARQ-ACK are transmitted;
  • Npucc H denotes the offset value in terms of indices of the reserved resources for SRI/HARQ-ACK
  • PUCCH denotes a dedicated resource index of SRI/HARQ- ACK for a UE
  • ⁇ TM denotes the separation between adjacent resources of SRI/HARQ-ACK in terms of CS.
  • N ⁇ indicates the reserved RBs for CQI
  • the reserved RBs can be used by PRACH and/or PUSCH based on current agreements.
  • a typical procedure comprises one or more of the following processes :
  • a UE receiver which may be either camped/connected to a certain HeNB or integrated with a certain HeNB listens and identifies the strongest WA cell as well as resources used for PUCCH by this cell (e.g. the N ⁇ , defined in document TS 36.211) .
  • the HeNB autonomously chooses its own PUCCH resources. A wider margin compared to an overlay WA cell is reserved for PUCCH transmissions (set by the N ⁇ parameter) . Only PRBs over which a WA PUCCH is not transmitted are used for the LA PUCCH (selected by the 4 UCCH ) •
  • a UE connected to WA and LA in the same geographical area transmits PUCCCH over different frequency resources thus avoiding a PUCCH co-channel interference.
  • a HeNB may report to a central element such as e.g. an O&M center or a femto gateway the strongest measured WA cell (e.g. physical cell ID) and its PUCCH configuration as well as its own cell ID and a PUCCH configuration, and then gets an acknowledgement (ACK) from the central element.
  • a central element such as e.g. an O&M center or a femto gateway the strongest measured WA cell (e.g. physical cell ID) and its PUCCH configuration as well as its own cell ID and a PUCCH configuration
  • ACK acknowledgement
  • the HeNB can suggest a new and different value or the central element can signal an appropriate value.
  • PUCCH resource partitioning An example for PUCCH resource partitioning is shown in Fig. 4.
  • the H(e)NB uses only PUCCH blocks closer to the center of the band and utilizes/needs only e.g. PUCCH 10 and PUCH 11 due to the smaller number of users in LA compared to WA.
  • WA uses PUCCH 0-7, and optionally e.g. PUCCH 8 and PUCCH 9 is utilized as guard band so that the HeNB can filter out high interference from WA PUCCH 0-7 by an appropriate band of the filter. Though, this is optional, since even with the same band of the LA filter exclusive PUCCH resources for LA and WA will bring significant reduction of PUCCH-to-PUCCH interference.
  • the WA-to-LA interference to the LA' s PUSCH may not be considered as a critical issue because the HeNB can rely on UL HARQ retransmissions and UL sounding with UL frequency domain packet scheduling to overcome or avoid interference.
  • the interference issue in this connection can be further mitigated.
  • HII high interference indicator
  • this mechanism is enhanced to inform the HeNBs about the high interference UL PRBS of its WA cell. Because there is no X2 interface between LA and WA, the WA cell sends the HIIs not (only) on the X2 interface, but also on the radio interface, e.g. on the BCCH, or emulates X2 interface via Sl connection, so that the HeNB can listen to the WA' s HII, identify the PRBs on which high interference can be injected from the WA cell and avoid data/control transmission on these PRBs to mitigate the interference.
  • the interference indicator enables time domain coordination between WA and LA (compared to frequency domain coordination by the HHI according to Rel-8) .
  • it is e.g. indicated to the HeNB in which frames/subframes of the WA system high interference can occur.
  • high WA interference can occur, but not during other SFNs. It is to be understood that this can be applied on the subframe level as well, e.g. subframes # ⁇ 1, 3, 5, 7, 9 ⁇ can be marked as HII by the WA cell.
  • HeNBs are synchronized to their WA overlay cell (strongest received WA cell) , and that the SFN timing difference of HeNB to WA NB is known.
  • certain embodiments of the present invention can advantageously be applied to 3GPP based environments such as a LTE compliant HeNB product and local area eNBs with CSG capability.
  • exemplary embodiments of the present invention provide, for example from the perspective of a network element such as a home evolved Node B, or a component thereof, an apparatus embodying the same, a method for controlling and/or operating the same, and computer program (s) controlling and/or operating the same as well as mediums carrying such computer program (s) and forming computer program product (s) .
  • apparatuses, methods and computer program products capable of providing reduced interference between a local area cell and a wide area cell.
  • a wide area cell of a wide area overlay macro communication network transmitting the highest signal strength is identified.
  • a communication resources configuration used in a transmission of the wide area cell is identified.
  • a communication resources configuration for use in a local area cell using a same access protocol as the wide area cell can then be determined such that it is determined different from the communication resources configuration used in the transmission of the wide area cell so that interference between the transmission of the wide area cell and a transmission of the local area cell is reduced.
  • Implementations of any of the above described blocks, apparatuses, systems, techniques or methods include, as non limiting examples, implementations as hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.

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  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un appareil, un procédé, un système et un produit-programme d'ordinateur qui sont aptes à réduire des interférences entre une cellule de réseau local et une cellule de réseau longue distance. Une cellule de réseau de communication longue distance d'un réseau de communication longue distance à macro recouvrement qui transmet le signal ayant la plus forte intensité est identifiée. Par ailleurs, une configuration de ressources de communication utilisées dans une transmission de la cellule de réseau longue distance est identifiée. Sur la base de ces éléments, une configuration de ressources de communication destinée à un usage dans une cellule de réseau local utilisant le même protocole d'accès que la cellule de réseau longue distance peut alors être déterminée. Cette configuration est déterminée comme étant différente de la configuration de ressources de communication utilisée dans la transmission de la cellule de réseau longue distance; et ceci permet de réduire des interférences entre la transmission de la cellule de réseau longue distance et une transmission de la cellule de réseau local.
PCT/EP2009/053314 2009-03-20 2009-03-20 Réduction des interférences entre une cellule de réseau local et une cellule de réseau longue distance WO2010105693A1 (fr)

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PCT/EP2009/053314 WO2010105693A1 (fr) 2009-03-20 2009-03-20 Réduction des interférences entre une cellule de réseau local et une cellule de réseau longue distance

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PCT/EP2009/053314 WO2010105693A1 (fr) 2009-03-20 2009-03-20 Réduction des interférences entre une cellule de réseau local et une cellule de réseau longue distance

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WO2012107106A1 (fr) * 2011-02-11 2012-08-16 Nokia Siemens Networks Oy Signalisation d'un modèle silencieux à un équipement d'utilisateur pour une coordination améliorée des interférences intercellulaires du domaine temporel
WO2013173978A1 (fr) * 2012-05-22 2013-11-28 Nokia Corporation Procédé et appareil pour des transmissions de signalisation
EP2775771A1 (fr) * 2011-11-29 2014-09-10 Huawei Technologies Co., Ltd. Procédé et dispositif pour une transmission de données sur un canal physique de commande sur la liaison montante
US9584281B2 (en) 2012-01-04 2017-02-28 Qualcomm Incorporated Position based signaling for short packets with minimal interference to the macro

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Publication number Priority date Publication date Assignee Title
WO2012107106A1 (fr) * 2011-02-11 2012-08-16 Nokia Siemens Networks Oy Signalisation d'un modèle silencieux à un équipement d'utilisateur pour une coordination améliorée des interférences intercellulaires du domaine temporel
CN103460776A (zh) * 2011-02-11 2013-12-18 诺基亚西门子网络公司 针对时域增强小区间干扰协调向用户设备传送静音模式
EP2775771A1 (fr) * 2011-11-29 2014-09-10 Huawei Technologies Co., Ltd. Procédé et dispositif pour une transmission de données sur un canal physique de commande sur la liaison montante
EP2775771A4 (fr) * 2011-11-29 2014-10-29 Huawei Tech Co Ltd Procédé et dispositif pour une transmission de données sur un canal physique de commande sur la liaison montante
US9584281B2 (en) 2012-01-04 2017-02-28 Qualcomm Incorporated Position based signaling for short packets with minimal interference to the macro
WO2013173978A1 (fr) * 2012-05-22 2013-11-28 Nokia Corporation Procédé et appareil pour des transmissions de signalisation

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