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WO2014066333A2 - Cellule composite - Google Patents

Cellule composite Download PDF

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Publication number
WO2014066333A2
WO2014066333A2 PCT/US2013/066096 US2013066096W WO2014066333A2 WO 2014066333 A2 WO2014066333 A2 WO 2014066333A2 US 2013066096 W US2013066096 W US 2013066096W WO 2014066333 A2 WO2014066333 A2 WO 2014066333A2
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WO
WIPO (PCT)
Prior art keywords
child
composite cell
femtocell
femtocells
cell
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.)
Ceased
Application number
PCT/US2013/066096
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English (en)
Other versions
WO2014066333A3 (fr
Inventor
Jung-Tao Liu
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ABLAZE WIRELESS Corp
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ABLAZE WIRELESS Corp
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Filing date
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Publication of WO2014066333A2 publication Critical patent/WO2014066333A2/fr
Anticipated expiration legal-status Critical
Publication of WO2014066333A3 publication Critical patent/WO2014066333A3/fr
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
    • 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
    • H04W16/24—Cell structures
    • H04W16/28—Cell structures using beam steering
    • 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
    • H04W36/247—Reselection being triggered by specific parameters by using coverage extension
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/143—Downlink power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/241—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account channel quality metrics, e.g. SIR, SNR, CIR or Eb/lo
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/30—Transmission power control [TPC] using constraints in the total amount of available transmission power
    • H04W52/32—TPC of broadcast or control channels
    • H04W52/322—Power control of broadcast channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/30—Transmission power control [TPC] using constraints in the total amount of available transmission power
    • H04W52/36—Transmission power control [TPC] using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • H04W52/367—Power values between minimum and maximum limits, e.g. dynamic range
    • 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 invention relates to femtocell (a.k.a. small cell); in particular, to a composite cell operated in a peer mode without any parent femtocell.
  • femtocell a.k.a. small cell
  • the invention can be easily applied to any type of cellular basestations.
  • beamforming techniques are divided into two main categories: fully adaptive (smart antenna) beamforming and fixed (a.k.a sectorized) Beamforming.
  • a fully adaptive beamforming for an FDD system, the mobile phone tries to estimate the radio channel's condition based on received signal; then feedback these information to the basestation; basestation then use this information to direct any dedicated data toward this particular mobile. This procedure is done for all mobile phones or a sub-set of handsets served by the basestation.
  • This is called smart antenna because the beamforming is done for each mobile phone and the basestation continuously adapt the beam direction according the latest feedback from the mobile phone.
  • the benefit of this approach is that the basestation only transmit signal in the direction of the mobile phone instead of radiating the signal all around it.
  • a basestation can perform adaptive beamforming without the help of mobile feedback since the system transmits and receives signal in the same frequency band. Instead of directing the signal to individual mobiles, fixed beamforming forms beams in fixed directions and use these beams to create virtual sectors. The more sectors are created, the better the improvement to the overall system capacity.
  • Sectorized beamforming is relatively easy to implement and does not rely on mobile to perform any extra work.
  • 3 GPP a couple of beamforming algorithms are adopted, which includes: CLTD, MIMO, PARC. All these methods are some kind of adaptive beamforming.
  • CLTD is a simplified adaptive beamforming, where the beam can only be adaptively points to a set of fixed directions.
  • MIMO is a smart antenna approach but each instead of finding one direction, the system tries to find two directions (or more) that are suitable for the mobiles, then each beam carries a different data stream to increase overall data throughput.
  • the invention provides a composite cell to solve the above-mentioned problems occurred in the prior arts.
  • a scope of the invention is to provide a beamforming assisted self-organizing network to make the basestation to use detected interference profile to adjust its antenna pattern on the downlink and the total transmit power to optimize the femtocell coverage and reduce the inter-cell interference.
  • Another scope of the invention is to provide a composite cell operated in a peer mode without any parent femtocell.
  • the child femtocells work together with the composite cell controller to provide services across the composite cell. It should be noticed that each child femtocell can have different coverage. Coverage of the child femtocell is optimized by using the beamforming assisted self-organizing network algorithm mentioned above.
  • a composite cell is operated in a peer mode without any parent femtocell and the composite cell includes a plurality of child femtocells and a composite cell controller.
  • the composite cell controller is coupled to the plurality of child femtocells and used for selecting a first child femtocell from the plurality of child femtocells as a system frame number (SFN) beacon and controlling the plurality of child femtocells other than the first child femtocell to be synchronized to the first child femtocell.
  • SFN system frame number
  • the plurality of child femtocells works together with the composite cell controller to provide services across the composite cell.
  • the plurality of child femtocells broadcast with the same cell ID, the same broadcast channel (BCH), and the same primary common control physical channel (PCCPCH).
  • the composite cell controller decides that a primary scrambling code or a secondary scrambling code is assigned to one of the plurality of child femtocells for dedicated channel (DCH) or high speed downlink shared channel (HS-DSCH).
  • DCH dedicated channel
  • HS-DSCH high speed downlink shared channel
  • the plurality of child femtocells use a beamforming assisted self-organizing network to optimize broadcast and common channel coverage of the composite cell.
  • the broadcast and common channel coverage of the composite cell is optimized according to a perceived interference profile from a sniffer, a maximum power limit, and a maximum signal to interference plus noise ratio (SINR).
  • SINR signal to interference plus noise ratio
  • the composite cell controller selects a new primary synchronization channel (PSC) for the new composite cell and then the composite cell controller selects at least one child femtocell to the new composite cell and informs the selected at least one child femtocell the new primary synchronization channel (PSC), a new broadcast channel (BCH), and an exact system frame number (SFN) to switch, and then the selected at least one child femtocell performs the switch after receiving a command from the composite cell controller and starts to talk to a new composite cell controller of the new composite cell.
  • PSC primary synchronization channel
  • BCH new broadcast channel
  • SFN exact system frame number
  • the composite cell of the invention has advantages of: (1) Low interference;
  • the user equipment location polling provides better location information for the user equipment in the composite cell.
  • the composite cell of the invention can be widely used at public indoor (e.g., shopping mall, train station, hotel, restaurant), public outdoor (e.g., stadium, urban streets, hotspots), and enterprise and enable new applications such as location based services, hotel check-in and check-out, and restaurant food ordering and payment.
  • public indoor e.g., shopping mall, train station, hotel, restaurant
  • public outdoor e.g., stadium, urban streets, hotspots
  • enterprise e.g., a new applications such as location based services, hotel check-in and check-out, and restaurant food ordering and payment.
  • the composite cell is operated in the peer mode, since no parent femtocell is needed, there will be no impact to the existed macro cell. It is self-organized, and more child femtocells can be quickly added to the composite cell. Multiple composite cells can be automatically merged into one when they make contact. It has beam forming assisted coverage planning
  • FIG. 1 shows a flowchart of a method of operating a beamforming assisted self- organizing network.
  • FIG. 2 shows a basestation periodically scanning the environment using the directional beam pattern.
  • FIG. 3 shows a structure of a two- antenna beamforming assisted self-organizing network.
  • FIG. 4 shows a structure of a three-antenna beamforming assisted self-organizing network.
  • FIG. 5 shows an embodiment of excessive signaling.
  • FIG. 6 shows an embodiment of the pure HNS implementation of a composite cell.
  • FIG. 7 shows an embodiment of a composite cell is implemented in the hybrid mode (HNS+RNS).
  • FIG. 8 shows the timing synchronization between the patent femtocell and the child femtocell in the composite cell.
  • FIG. 9 shows the relationships among the different time delays.
  • FIG. 10A shows the normal mode of the composite cell.
  • FIG. 10B shows the peer mode of the composite cell.
  • FIG. 11 shows an embodiment of the peer mode of the composite cell.
  • FIG. 12 shows an embodiment of the broadcast and common channel coverage optimization for composite cell in the peer mode.
  • FIG. 13A shows coverage optimization with maximum interference.
  • FIG. 13B shows coverage optimization without maximum interference.
  • FIG. 14A and FIG. 14B show the secondary scrambling code coverage optimization of the composite cell in the peer mode.
  • FIG. 15 shows two composite cells coupled to the controller.
  • FIG. 16 shows that two composite cells are contacted through one of their child femtocells.
  • FIG. 17 shows that the merging of the two composite cells is done.
  • a goal of the invention is provide a beamforming assisted self-organizing network to make the basestation to use detected interference profile to adjust its antenna pattern on downlink and the total transmit power to optimize the femtocell coverage and reduce the inter-cell interference.
  • the algorithm proposed jointly optimized the transmit power and antenna pattern; then iteratively adjust them according to the interference which is periodically monitors by the basestation.
  • FIG. 1 shows a flowchart of a method of operating a beamforming assisted self-organizing network.
  • the method collects an interference profile; in the step SI 2, the method uses the interference profile to optimize a downlink transmit power and an antenna pattern; in the step S14, the method adjusts the downlink transmit power and the antenna pattern to avoid the inter-cell interference.
  • the beamforming assisted self-organizing network works as follows:
  • the basestation tunes its network monitor to the same frequency band as the one it is transmitting.
  • the basestation BS periodically scans the environment using the network monitor and the directional beam pattern as shown in FIG. 2.
  • the basestation scans the environment for SINR of the pilot signals of its neighboring basestations. (4) The basestation scans for the RSSI (Received Signal Strength Indicator) or the surroundings and forms an interference profile Vietnamese ⁇ 4 I, wherein D is the number of directions scanned.
  • RSSI Receiveived Signal Strength Indicator
  • the basestation do so only for the frequency band it is transmitting.
  • the basestation scans at least 8 different directions to form a complete interference profile.
  • the basestation use the following algorithm to determine the antenna pattern and its power:
  • V w*X + Cl *rand*(G b est-X) + C2*rand*(P best -X)
  • V velocity
  • X position
  • parameter CI and C2 are selected to be inverse proportional to the interference profile 3 ⁇ 4 ., ⁇ . 3 ⁇ 4 ]
  • x x+v
  • a total power P is selected using a table look up that is inversely proportional to R.
  • FIG. 3 shows a structure of a two-antenna beamforming assisted self-organizing network having a beamforming module BF and two antennas Anl ⁇ An2.
  • FIG. 4 shows a structure of a three-antenna beamforming assisted self-organizing network having a beamforming module BF and three antennas Anl ⁇ An3.
  • the WCDMA sniffer WCDMA1 is beam formed as well when performing in-band sniffing; for out of band sniffing and GSM sniffing, beam forming should be turned off for the WCDMA sniffer WCDMA2.
  • Composite cell is a femtocell deployment methodology that aiming to relief excessive signaling caused the handover between femtocells, and the deterioration of the quality of service caused by mobile hopping between femtocells. It has the following benefits:
  • ISD inter-site distance
  • composite cell can reduce the number of handovers back to two handovers for one user equipment. It does not reduce network side traffic but it does help receive handovers on the mobile (user equipment) side. Similar number for cell reselection applies to regular femtocell deployment when the user equipment is in the idle mode. Composite cell requires NO cell reselection.
  • the composite cell In a nutshell, the composite cell combines concepts of SFN, SDMA, SSC (Secondary Scrambling Code), DAS, ICIC, and SON.
  • the parent femtocell monitors the departure of the child femtocells.
  • the child femtocell can send request to the parent femtocell to join the composite cell.
  • the composite cell introduces new concepts of DSPS (distributed signal processing system), IaCIC (Intra-cell interference coordination), NodeB assisted intra-cell handover, and user equipment location polling.
  • DSPS distributed signal processing system
  • IaCIC Intelligent-cell interference coordination
  • NodeB assisted intra-cell handover the intra-cell handover is defined as any handover occurred inside the composite cell.
  • parent can "ping" the user equipment within the composite cell in order to find out the location of user equipment. The location of user equipment is calculated by the parent w/o the user equipment knowing it. Even when the user equipment is in the idle mode, the user equipment location polling can still work.
  • SFN can be applied to P- CCPCH and P-CPICH. It can make homogeneous BCH by converting >20% interfering FAP power into constructive signal enhancement to the parent femtocell. It can reduce the number of cell reselection by the user equipment, the number of neighbor cell measurement performed by the user equipment, and the downlink "dead-zone" created by the femtocell to the nearby macro user equipment. IaCIC used on S-CCPCH can enhance FACH and PCH performance.
  • the parent femtocell coordinates S-CCPCH & PICH transmission, and the child femtocells are group into spatially independent groups. It jointly optimizes intra-cell paging area and S-CCPCH broadcast area. S-CCPCH & PICH transmissions are synchronized in each broadcast group and paging area. There are some features of the composite cell as follows:
  • Child femtocells use secondary scrambling codes for HSDPA & DPCH. It can also reduce UL interference to the macro cell.
  • Parent femtocell maintains the neighboring information of the child femtocells in a centralized fashion.
  • Neighboring cell Information list on BCH is the same for all femtocells in the composite cell containing only other non composite cell information. It eliminates need for child femtocells to maintain individual neighboring cell information list.
  • a composite cell controller is responsible for the followings: responding to new request-to-joint message from femtocell; synchronizing BCH information; administrating procedure to determine child femtocell neighbor information; optimizing S-CCPCH broadcast area and Paging area; coordinating FACH and PCH transmissions; determining intra-cell handover directions; commanding child femtocell to handover user equipment to another child femtocell (or the parent femtocell), and managing the child femtocell secondary scrambling code assignment.
  • the parent femtocell is responsible for the followings: updating the uplink user equipment scrambling code list to the composite cell controller; receiving FACH and PCH information from the composite cell controller and broadcasting them; serving the user equipment in the composite cell not served by the child femtocell, so that HSDPA and DPCH are over the primary scrambling code.
  • the parent femtocell is responsible for inter-cell handover from other cell (hand-in) and inter-cell hand out.
  • the child femtocell is responsible for the followings: powering on search for the parent femtocell to issue request-to-join message to the parent femtocell; framing synchronize to the parent femtocell; obtaining the BCH information from the parent femtocell and broadcasting it (or optionally from the composite cell controller); decoding RACH preamble and message; transmitting AICH of the corresponding RACH message; relaying RACH message to the parent femtocell; receiving FACH and PCH information from the composite cell controller and broadcasting them; serving HSDPA and DPCH of the associated user equipment over the secondary scrambling code; serving HSUPA and DPCH of the associated user equipment on the uplink; relaying the user equipment uplink information to the parent femtocell.
  • the inter-cell hand out is an independent decision by each child femtocell.
  • composite cell requires a parent femtocell overlooking a bunch of child femtocells.
  • the implementation can be done in different ways.
  • the composite cell controller can be an integrated part of either the parent femtocell or the femto gateway. Or it can be implemented as an independent element in the network.
  • the parent femtocell is from the RNS architecture.
  • the composite cell controller needs to be able to exchange at least the following information with the SRNC of the parent cell:
  • FIG. 8 shows the timing synchronization between the patent femtocell PF and the child femtocell CF in the composite cell.
  • FIG. 9 shows the relationships among the different time delays. Child femtocell synchronization requires:
  • T CU For a child femtocell ranges ⁇ 1km, T CU is ⁇ 12 chips. (3) Assuming T pc ⁇ ⁇ ⁇ , ⁇ , T err is approximately equal to the user equipment multipath search window UESW shown in FIG. 9. The user equipment is required to support delay spread up to 20,000 nsec. 15-20 chips is sufficient for cell range ⁇ 1km, and T err should be less than 3-8 chips under these assumptions.
  • (4) Frame synchronization to within a few chips is a must.
  • An example of the Layer 1 synchronization procedures are provided as follows: Parent femtocell identity is confirmed by the core network; Child femtocell performs slot and frame synchronization against P-Sync and S-Sync channel of the parent femtocell; Child femtocell aligns internal clock of the parent femtocell' s frame timing; Child femtocell starts sniffing BCH information from the parent femtocell; Child femtocell aligns system frame number (SFN) to the parent femtocell; Child femtocell starts broadcasting the same information; Child femtocell continuously tracks the parent femtocell timing.
  • SFN system frame number
  • a composite cell can be deployed without a parent femtocell. This is called the peer mode of the composite cell.
  • the peer mode of the composite cell When the composite cell is operated in the peer mode, child femtocells work together with the composite cell controller to provide services across the composite cell. It should be noticed that each child femtocell can have different coverage.
  • FIG. 10A and FIG. 10B FIG. 10A shows the normal mode of the composite cell 10A.
  • FIG. 10B shows the peer mode of the composite cell 10B. As shown in FIG. 10B, there is no parent femtocell in the composite cell 10B and the coverage of one child femtocell contacts with that of another child femtocell.
  • Coverage of the child femtocell CF is optimized by using the beamforming assisted self-organizing network algorithm mentioned above. Since there is no parent femtocell, a child femtocell is selected as SFN (System Frame Number) beacon and start transmitting downlink right away after power on in order for all other child femtocells to perform SN synchronization. All child femtocells should be synchronized to the PSC of the other child femtocells. Only when a child femtocell can hear another child femtocell and achieve synchronization can it be counted as part of the composite cell.
  • SFN System Frame Number
  • child femtocells can be pre-identified to belong to a particular composite cell. All child femtocells capable of hearing macro basestation or other non composite cell member basestations should synchronize and lock on their oscillator to those basestations.
  • FIG. 11 shows an embodiment of the peer mode of the composite cell.
  • the peer mode of the composite cell 11 can be provided as follows: (1) All child femtocells CF broadcast with the same Cell ID, BCH, PCCPCH, and primary scrambling code.
  • the composite cell controller CCC decides which scrambling code is assigned to which child femtocell CF for DCH and HS-DSCH. Unlike in the normal mode, both primary scrambling code and secondary scrambling code can be assigned for DCH and HS-DSCH in the peer mode. The primary scrambling code is assigned to more critical child femtocells CF.
  • the composite cell controller CCC coordinates DPCH across child femtocells CF.
  • the primary scrambling code can be used as much as possible. For example, CoMP is possible.
  • Each child femtocell CF is assigned a group of OVSF codes mutually exclusive to its neighbor child femtocells.
  • the secondary scrambling code can be assigned. For example, SHO is possible.
  • FIG. 12 shows an embodiment of the broadcast and common channel coverage optimization for composite cell in the peer mode.
  • broadcast and common channel coverage can be optimized as follows:
  • All child femtocells optimize broadcast and common channels by using beamforming assisted self-organizing network.
  • CPICH and PCCPCH overlap provides rich multipath to enhance performance.
  • All FACH are coordinated.
  • broadcast and common channel can be optimized similar to DCH and HS without benefit of CoMP.
  • Broadcast and common channel coverage is optimized according to perceived interference profile from the sniffer, maximum power limit, and maximum SINR. And, an effective cell range of the composite cell is shown in FIG. 12.
  • FIG. 13A For broadcast and common channel coverage optimization, a maximum interference is introduced as show in FIG. 13A to avoid the beam pattern points BP extending too far into the neighboring child femtocells CF.
  • FIG. 13B shows coverage optimization without maximum interference. Therefore, the beam pattern points BP extends too far into the neighboring child femtocells CF in FIG. 13B.
  • Each child femtocell use different scrambling code from its neighboring child femtocells.
  • Controller starts sequentially and iteratively optimizes the downlink antenna pattern and power according to the beamforming assisted self-organizing network.
  • FIG. 14A and FIG. 14B show the secondary scrambling code coverage optimization of the composite cell in the peer mode.
  • FIG. B after the secondary scrambling code coverage optimization of the composite cell is done, the coverage of the child femtocell will become irregular shape from the cycle shown in FIG. 14 A.
  • Frame synchronization between the child femtocells is done as follows:
  • a beacon child femtocell is selected to start downlink transmission.
  • FIG. 15 shows two composite cells CCl and CC2 coupled to the composite cell controller CCC.
  • FIG. 16 shows that two composite cells CCl and CC2 are contacted through their child femtocells CF1 and CF2.
  • FIG. 17 shows that the two composite cells CCl and CC2 are merged into a combined composite cell CC by the composite cell controller CCC and all child femtocells in the combined composite cell CC will transmit the same PSC and BCH.
  • a composite cell split is also possible, for example, when there are too many child femtocells in the composite cell.
  • the process of splitting the composite cell is straight forward.
  • the composite cell controller selects a new primary synchronization channel (PSC) for the new composite cell and then the composite cell controller selects at least one child femtocell to the new composite cell and informs the selected at least one child femtocell the new primary synchronization channel (PSC), a new broadcast channel (BCH), and an exact system frame number (SFN) to switch, and then the selected at least one child femtocell performs the switch after receiving a command from the composite cell controller and starts to talk to a new composite cell controller of the new composite cell.
  • PSC primary synchronization channel
  • BCH new broadcast channel
  • SFN exact system frame number
  • the composite cell of the invention has advantages of: (1) Low interference;
  • the user equipment location polling provides better location information for the user equipment in the composite cell.
  • the composite cell of the invention can be widely used at public indoor (e.g., shopping mall, train station, hotel, restaurant), public outdoor (e.g., stadium, urban streets, hotspots), and enterprise and enable new applications such as location based services, hotel check-in and check-out, and restaurant food ordering and payment.
  • public indoor e.g., shopping mall, train station, hotel, restaurant
  • public outdoor e.g., stadium, urban streets, hotspots
  • the composite cell When the composite cell is operated in the peer mode, since no parent femtocell is needed, there will be no impact to the existed macro cell. It is self-organized, and more child femtocells can be quickly added to the composite cell. Multiple composite cells can be automatically merged into one when they make contact. It has beam forming assisted coverage planning and network assisted HO inside the composite cell. The broadcast and common channel performance of the composite cell can be enhanced by single frequency network. It connects to FGW and composite cell controller and independent from RNS architecture.

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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 une cellule composite qui fonctionne dans un mode de pair à pair sans femtocellule parente. La cellule composite comprend une pluralité de femtocellules filles et un contrôleur de cellule composite. Le contrôleur de cellule composite est couplé à la pluralité de femtocellules filles et utilisé pour choisir une première femtocellule fille parmi la pluralité de femtocellules filles en tant que balise de numéro de trame système (SFN) et commander la pluralité de femtocellules filles autres que la première femtocellule fille de façon à se synchroniser à la première femtocellule fille. La pluralité de femtocellules filles travaillent ensemble avec le contrôleur de cellule composite pour fournir des services sur la cellule composite.
PCT/US2013/066096 2012-10-22 2013-10-22 Cellule composite Ceased WO2014066333A2 (fr)

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