Method for controlling interference in femto cell deployments
Abstract
A method and system provide a plurality of femto cells that are deployed within a macro cell of cellular network. The femto cells improve cellular service inside structures, such as residential and commercial structures. Femto base stations convert signals between an airlink-interface and core network to enable data communication between the mobile terminal and an access network to occur through the Internet and a public switched telephone network. The femto base stations are independent of each other and the macro cell. The method and system provide the femto base stations with interference awareness and mitigation techniques to minimize interference with the cellular network.

Term
Projected expiry 24 March 2029.
- Priority
- Filed
- Granted
- Today
- Projected expiry
20 claims: 2 independent, 18 dependent
- 1Método de reduzir interferência entre uma célula femto e uma macrocélula em uma rede de comunicação sem fio, o método compreendendo:identificar uma pluralidade de portadoras de sinal sem fio préselecionadas com base em uma área geográfica predefinida;medir níveis de potência inicial para as portadoras de sinal sem fio fornecidas na área geográfica predefinida;selecionar uma das portadoras de sinal sem fio com base em critérios predefinidos associados com o nível de potência inicial medido;e ajustar um nível de potência de transmissão de um transmissor femto com base em uma comunicação colocada para um terminal móvel.
- 2Método de acordo com a reivindicação 1, em que identificar a pluralidade de portadoras de sinal sem fio pré-selecionadas é com base na localização da célula femto.
- 3Método de acordo com a reivindicação 1, em que medir os níveis de potência inicial para as portadoras de sinal sem fio inclui medir o indicador de intensidade de sinal recebido da pluralidade de portadoras de sinal sem fio pré-selecionadas.
- 4Método de acordo com a reivindicação 1, compreendendo adicionalmente classificar os níveis de potência inicial medidos para as portadoras de sinal sem fio.
- 5Método de acordo com a reivindicação 1, em que os critérios predefinidos associados com selecionar uma das portadoras de sinal sem fio incluem pelo menos um de suportar uma quantidade mais baixa de tráfego de terminal móvel e fornecer um nível de potência inicial mais alto.
- 6Método de acordo com a reivindicação 1, em que ajustar o nível de potência de transmissão do transmissor femto é determinado com base em:(Nível de Potência Inicial de Macrocélula Medido) - (Perda de Caminho Femto Esperado), em que o nível de potência inicial de macrocélula medido é um nível de potência inicial medido femto para a portadora de sinal sem fio selecionada e a perda de caminho femto esperada é variável predefinida com base em uma localização femto ou em um perfil para implementação.
- 7Método de acordo com a reivindicação 1, compreendendo adicionalmente solicitar uma medição periódica de intensidade piloto e reduzir a potência de transmissão se a medição de intensidade piloto estiver acima de um valor limiar.
- 8Método de acordo com a reivindicação 1, compreendendo adicionalmente solicitar uma medição periódica de intensidade piloto e manter a potência de transmissão se a medição de intensidade piloto estiver abaixo de um valor limiar.
- 9Método de acordo com a reivindicação 1, compreendendo adicionalmente obter pelo menos um de um valor de controle de taxa de dados médio e um valor de indicador de qualidade de sinal médio e reduzir a potência de transmissão se pelo menos um de o valor de controle de taxa de dados médio e o valor de indicador de qualidade de sinal médio estiver acima de um valor limiar.
- 10Método de acordo com a reivindicação 1, compreendendo adicionalmente obter pelo menos um de um valor de controle de taxa de dados médio e um valor de indicador de qualidade de sinal médio e manter a potência de transmissão se pelo menos um de o valor de controle de taxa de dados médio e o valor de indicador de qualidade de sinal médio estiver abaixo de um valor limiar.
- 11Sistema para reduzir interferência entre uma célula femto e uma macrocélula em uma rede de comunicação sem fio, o sistema compreendendo:um módulo de seleção de portadora, o módulo de seleção de portadora: identificando uma pluralidade de portadoras de sinal sem fio préselecionadas com base em uma área geográfica predefinida;medindo níveis de potência inicial para as portadoras de sinal sem fio fornecidas na área geográfica predefinida;e selecionando uma das portadoras de sinal sem fio com base em critérios predefinidos associados com o nível de potência inicial medido;e um módulo de sintonização fina, o módulo de sintonização fina ajustando um nível de potência de transmissão de um transmissor femto com base em uma comunicação enviada para um terminal móvel.
- 12Sistema de acordo com a reivindicação 11, em que o módulo de seleção de portadora identifica a pluralidade de portadoras de sinal sem fio pré-selecionadas com base na localização da célula femto.
- 13Sistema de acordo com a reivindicação 11, em que o módulo de seleção de portadora mede os níveis de potência inicial para as portadoras de sinal sem fio ao medir o indicador de intensidade de sinal recebido da pluralidade de portadoras de sinal sem fio pré-selecionadas.
- 14Sistema de acordo com a reivindicação 11, em que o módulo de seleção de portadora classifica os níveis de potência inicial medidos para as portadoras de sinal sem fio.
- 15Sistema de acordo com a reivindicação 11, em que o módulo de seleção de portadora aplica critérios predefinidos para selecionar uma das portadoras de sinal sem fio incluindo pelo menos um de suportar uma quantidade mais baixa de tráfego de terminal móvel e fornecer um nível de potência inicial mais alto.
- 16Sistema de acordo com a reivindicação 11, compreendendo adicionalmente um módulo de controle de potência, o módulo de controle de potência ajustando o nível de potência de transmissão do transmissor femto com base em:(Nível de Potência Inicial de Macrocélula Medido) - (Perda de Caminho Femto Esperado), em que o nível de potência inicial de macrocélula medido é um nível de potência inicial medido femto para a portadora de sinal sem fio selecionada e a perda de caminho femto esperada é variável predefinida com base em uma localização femto ou em um perfil para implementação.
- 17Sistema de acordo com a reivindicação 11, em que o módulo de sintonização fina solicita uma medição periódica de intensidade piloto e reduz a potência de transmissão se a medição de intensidade piloto estiver acima de um valor limiar.
- 18Sistema de acordo com a reivindicação 11, em que o módulo de sintonização fina solicita uma medição periódica de intensidade piloto e 5 mantém a potência de transmissão se a medição de intensidade piloto estiver abaixo de um valor limiar.
- 19Sistema de acordo com a reivindicação 11, em que o módulo de sintonização fina obtém pelo menos um de um valor de controle de taxa de dados médio e um valor de indicador de qualidade de sinal médio e reduz 10 a potência de transmissão se pelo menos um de o valor de controle de taxa de dados médio e o valor de indicador de qualidade de sinal médio estiver acima de um valor limiar.
- 20Sistema de acordo com a reivindicação 11, em que o módulo de sintonização fina obtém pelo menos um de um valor de controle de taxa 15 de dados médio e um valor de indicador de qualidade de sinal médio e mantém a potência de transmissão se pelo menos um de o valor de controle de taxa de dados médio e o valor de indicador de qualidade de sinal médio estiver abaixo de um valor limiar.
Independent claims20
46 paragraphs, as filed
Descriptive Report of the Invention Patent for METHOD FOR CONTROLLING INTERFERENCE IN FEMTO CELL IMPLEMENTATIONS.
Field of Invention
The present invention relates to reducing interference between macrocells and femtocells that convert signals between an over-the-air link interface and a mainline, and more particularly to a method and system for controlling transmission power levels and providing optimal operating frequency selection algorithms for 10 base femto stations.
Background of the Invention
Wireless carriers employ cell towers to establish large cells to provide wireless communications to cover large physical areas, such as metropolitan or rural areas. Large cells, or macrocells, can cover areas from 1 km to 5 km in diameter. A cell tower broadcasts wireless signals throughout the macrocell to a large number of mobile phones.
Several buildings are typically located within the macrocell that obstruct, reflect, or otherwise interfere with wireless signals. For example, users typically attempt to use mobile devices inside homes or commercial establishments. These buildings may be constructed of high-loss materials, such as concrete or metal, which prevent wireless signals from entering the buildings. Poor wireless signal reception inside these buildings degrades service quality, resulting in unreliable mobile communications. A system and method are needed to improve cellular service inside buildings.
Summary of the Invention
The invention advantageously provides a method and system having knowledge of interference and provides mitigation techniques for femto base stations to minimize interference with the cellular network. According to one embodiment, the invention provides a method of reducing interference between a femto cell and a macrocell in a wireless communication network. The method involves identifying a plurality of pre-selected wireless signal carriers based on a predefined geographic area and measuring initial power levels for the wireless signal carriers provided in the predefined geographic area. One of the wireless signal carriers is selected based on predefined criteria associated with the measured initial power level. The transmission power level of a femto transmitter is adjusted based on a communication established for a mobile terminal.
According to another aspect, the invention provides a system for reducing interference between a femtocell and a macrocell in a wireless communication network. The system includes a carrier selection module that identifies a plurality of pre-selected wireless signal carriers based on a predefined geographic area, measures initial power levels for the wireless signal carriers provided in the predefined geographic area, and selects one of the wireless signal carriers based on predefined criteria associated with the measured initial power level. A fine-tuning module is provided to adjust the transmission power level of a femto transmitter based on a communication placed to a mobile terminal.
Brief Description of the Drawings
A fuller understanding of the present invention and of the concomitant advantages and features thereof will be more readily attained by reference to the following detailed description when considered in conjunction with the accompanying drawings, in which:
Figure 1 is a block diagram of an exemplary network architecture for wireless access networks constructed according to the principles of the invention;
Figure 2 is a flowchart of a method for adjusting the power level of a femtocell base station for a 1xRTT network in accordance with the principles of the present invention;
Figure 3 is a flowchart of a method for adjusting the power level of a femtocell base station for a 1xEV-DO network in accordance with the principles of the present invention; and
Figure 4 is a flowchart of a method for adjusting the power level of a femtocell base station for a Long-Term Evolution network in accordance with the principles of the present invention. Detailed Description of the Invention
The invention provides femto base stations or expanded residential Node B to improve cellular service inside buildings, such as residential and commercial buildings, among others. The femto base stations can operate in the femto power range of approximately +15 dBm and can provide an operating range of approximately 50 meters. The femto base stations are connected to the Internet and access mobile networks via the public switched telephone network. Femto base stations can use existing broadband access infrastructure from matching buildings to access the public switched telephone network. For example, femto base stations can be connected to a digital subscriber line (DSL) to access the public switched telephone network.
According to one embodiment, the invention can operate with existing cellular networks, such as CDMA2000 1xRTT, Evolution-Optimized Data (EV-DO), and Long-Term Evolution (LTE) networks, among other cellular networks. For example, femto base stations or low-power consumer base transceiver stations (BTS) and integrated base station controllers (BSCs) can form femto cells to communicate with mobile terminals using CDMA technology. Femto base stations can communicate over the Internet using Session Initiation Protocol (SIP), among other signaling protocols. Femto base stations convert signals between the air interface and SIP to enable data communication between the mobile terminal and the Internet, thus providing uninterrupted service to wireless users.
The invention supports a plurality of femto cells that are implemented within a macrocell. Although the various femto base stations are components of the total communications network, each femto cell is separate from the existing macrocell and any adjacent femto cells. During mobility, the system passes the mobile terminal communication session from one femto cell to the macrocell, or vice versa, or from one femto cell to another femto cell.
According to one embodiment, macrocells and femtocells employ different mainnets, resulting in inter-cell transfer technology or vertical inter-cell transfers (VHO) between cells. VHOs are performed when mobile terminals move between different mainnets, including moving out of a preferred network or moving into a preferred network. Inter-cell transfer procedures can be initiated when signal strength measurements originating from the active network, such as the cellular network or femto network, fall below pre-selected threshold parameters. The mobile terminal can detect weak signal strength emanating from the active access network and can initiate a cell transfer to the idle access network, such as the femto base station network or the cellular network, which has a stronger signal strength, by reporting the weak signal to the active access network.
Alternatively, inter-cell transfer procedures can be initiated for off-load mobile terminal traffic from the cellular network to the femto base station network. The femto base station is a personal and dedicated base station for each corresponding building. The femto base stations and the cellular network supporting the macrocell independently support network traffic. Since the femto cells implemented within the macrocell operate independently within the cellular network, the system does not provide integrated interference management between the macrocells and the femto cells. If unregulated, the cellular network and the femto base station networks produce mutual interference that can degrade system quality of service. The invention provides femto base stations with interference knowledge and mitigation techniques to minimize interference with the cellular network.
Referring now to figures in which identical reference designators refer to identical elements, Figure 1 illustrates an exemplary block diagram of a system generally designated as 100 that enables mobile terminals 105a-105n (referred to collectively in this document as mobile terminals 105) to communicate with the expanded Node B (eNB) 110 using a first access network 115 or second access networks 120a-120n (referred to collectively in this document as second access networks 120) in accordance with the principles of the invention. The eNB 110 may include servers, transceivers for transmitting and receiving radio signals, and antennas. The eNB 110 may include bidirectional transceivers that broadcast data to the surrounding environment and typically act as mediators between wired and wireless networks.
Mobile terminals 105 may include a wide range of portable electronic devices, including but not limited to mobile phones, personal digital assistants (PDAs) and similar devices, which use various communication technologies such as Advanced Mobile Telephone System (AMPS), Time Division Multiple Access (TDMA), Code Division Multiple Access (CDMA), Global System for Mobile Communications (GSM), General Packet Radio Service (GPRS), 1x optimized data evolution (abbreviated as EV-DO or 1xEV-DO) and universal mobile telecommunications system (UMTS). The 105 mobile terminals also include hardware and software suitable for supporting the control plane functions required for wireless communication with the eNB 110 and femto base stations 125. Such hardware may include a receiver, transmitter, central processing unit, storage in the form of volatile and non-volatile memory, and input/output devices, among other hardware.
The first access network 115 may include a CDMA 1xRTT network, an EV-DA network, or an LTE network, among other access networks. The second access networks 120 may include femto base stations 125a-125n (referred to collectively in this document as femto base stations 125) that are connected to a public switched telephone network (PST) 130 via a local area network 132, such as the Internet, and an Internet Service Provider (ISP) router 134. The PST 130 network can be connected to a cellular base transceiver station (BTS) 140, which is connected to the eNB 110. The system 100 coordinates transfer between cells of the mobile terminals 105 between the first access network 115 and the second access networks 120.
The cellular network operates in a conventional manner, controlling the first access network or macrocell 115 to cooperate efficiently with adjacent macrocells. For example, the cellular network can adjust characteristics such as transmission power or noise level, among other features.
The invention is directed towards managing secondary access networks 120. Secondary access networks 120 can be provided to operate inside corresponding buildings 145a-145n (referred to collectively in this document as buildings 145). Buildings 145 may include residential or commercial buildings, among other buildings. Buildings 145 may be constructed of high-loss materials such as concrete, brick, or metal, among other high-loss materials that prevent wireless signals from penetrating the buildings 145. As a result, any communication signals broadcast by the eNB 110 may not be received inside the buildings 145. Similarly, any communication signals broadcast by femto base stations 125 may not be transmitted outside buildings 145. Likewise, any communication signals broadcast by mobile terminals 105 while located inside buildings 145 may not be received by the eNB 110. Any communication signals broadcast by mobile terminals 105 while located outside buildings 145 may not be received at femto base stations 125.
Secondary access networks 120 are localized networks that are established by users to provide communication signals within the corresponding buildings 145. A decision to initiate transfer between mobile terminal cells 105 between the primary access network
115 and the secondary access networks 120 can occur when the active access network determines that the relevant mobile terminal 105 will be better served by the idle access network. Criteria for initiating an inter-cell transfer between the primary access network 115 and the secondary access networks 120 include preventing mobile terminals 105 from leaving the active access network or relieving load conditions on the active access network, among other criteria. In this respect, femto cells 120 can be configured to concurrently support multiple terminal devices 105. Any terminal devices 105 that are supported by the second access network, via the femto base station 125, are routed to the cellular base transceiver station 140 via the network 132. Thus, these mobile devices 105 do not use resources from the first access network 115. However, implementing a large number of femto-active cells 120 within a macrocell 115 can increase the likelihood of overloading cellular network resources, such as overloading the macrocell's uplink and degrading/increasing interference levels for mobile devices 105 on the downlink, among other ways of overloading cellular network resources. Overloading cellular network resources limits the coverage area and capacity of the macrocell.
Femto 125 base stations may include a central processing unit (CPU), transmitter, receiver, input/output devices, and storage, such as volatile and non-volatile memory, to implement the functions described in this document. Femto 125 base stations may communicate with 105 mobile terminals via a radio interface.
The femto 125 base station can be of modular construction to facilitate adding, deleting, upgrading, and/or splicing modules within the same module and/or features within modules. Modules may include a mobility management module 150, a radio access network (RAN) module 152, a carrier selection module 154, a power control module 156, and a fine-tuning module 158, among other modules. The mobility management module 150 manages the transfer between cells of mobile terminals 105 between macrocell 115 and femtocell 120, performs authentication of mobile terminals 105, and provides supplementary services. The RAN module 152 performs an air interface for SIP translation and converts between the first access network protocol and the second access network protocol and vice versa. For example, the RAN 152 module can provide conversion between CDMA/3GPP communications over the air and SIP communications via media for broadband Internet access.
During an initialization period, the carrier selection module 154 can access a memory structure to obtain a list of available wireless carriers and their corresponding frequency bands. For example, the carrier selection module 154 can access a database to obtain a list of wireless carriers that are available for a predefined geographic area. Geographic area information can be obtained manually by requesting information from the user or automatically through a global positioning system, or other techniques. The carrier selection module 154 can activate a CDMA transmit link receiver to measure the initial power level (l<sub>0</sub>) or Received Signal Strength Indication (RSSI) within a selected bandwidth to identify the input signal strength. The carrier selection module 154 can classify the information l<sub>0</sub> or RSSI according to predefined criteria. Predefined criteria may include, for example, power level or amount of loading, among other predefined criteria. The 154 carrier selection module can select a wireless carrier by selecting a frequency that is unoccupied, free from interference, or that contains a minimum amount of power. Systems that generate high power readings typically include high traffic volume.
Alternatively, the carrier selection module 154 can include an operations administrator that removes any unused CDMA carriers from the list of available carriers. Any unused CDMA carriers can be preserved for future expansion opportunities.
After selecting a wireless carrier, the power control module 156 can perform a coarse power adjustment of a transmitter that is associated with the femto base station 125. The power control module 156 can be configured to set a limit for the femto cells 120 that remain within the corresponding building 145. Otherwise, if the 120 femto cell is not managed to operate within the corresponding 145 building, then the transmission power of the 125 femto base station may negatively impact the performance of the macrocell uplink or downlink. A formula to adjust the power level might include: (Measured Initial Macrocell Power Level) - (Expected Femto Path Loss) = Initial Femto Transmission. The measured initial macrocell power level is a measured initial femto power level for the selected wireless signal carrier. The expected femto path loss is a predefined variable based on a femto location or a profile for implementation. The expected femto path loss can be obtained by requesting information from users during an initial setup procedure.
During initial setup, the user may be prompted to enter a description of the intended environment for the femto 125 base station. The description may include a building type, such as an apartment, a single-family home, a warehouse, and an approximate measurement in square meters (square feet). The apartment can be defined to include a cell radius of 10 m, with an expected path loss of 39 dB (for 1 m at 1900 Hz) and +30 dB for every 10X the distance.
In addition to interfering with the macrocell, a femtocell can also interfere with adjacent femtocells. For example, the 120a femtocell can interfere with the adjacent 120n femtocell. The invention is directed towards minimizing interference between the macrocell and associated femtocells that are implemented on the same radiofrequency (RF) carriers. To minimize interference between adjacent femtocells, the carrier selection module 154 can select a wireless carrier for a femtocell that is initialized second in time that is different from a femtocell that is initialized first in time. The 154 carrier selection module can activate a CDMA transmit link receiver to measure the initial power level (Io) or Received Signal Strength Indication (RSSI) within a selected bandwidth to identify the incoming signal strength. The 154 carrier selection module can classify the information l<sub>0</sub> or RSSI according to predefined criteria. Predefined criteria may include, for example, power level or charging quantity, among other predefined criteria.
After establishing the initial power transmission level, fine-tuning module 158 can initiate a call to target mobile terminal 105. Fine-tuning module 158 sends a message to target mobile terminal 105, such as an IS-2000/IS-856 message, requesting periodic pilot intensity measurements. Fine-tuning module 158 compares the received pilot intensity measurement with the predefined threshold. If the pilot intensity measurement exceeds the preset threshold value, then the transmission power is reduced and the reception attenuation is increased by a pre-selected amount, such as 1 dB or another amount. The fine-tuning module 158 repeats the process of decreasing the transmission power until the pilot intensity measurement falls below the preset threshold value.
An exemplary power tuning algorithm for the femto 125 base station operating on the 1xRTT network is discussed with reference to Figure 2. In step S202, during initialization, an operations administrator provides a list of valid wireless carriers that are authorized for a pre-selected region. The initial power level (l<sub>0</sub>The Received Signal Strength Indication (RSSI) is measured within a selected bandwidth to identify the input signal strength (step S204). In step S206, the RSSI is ranked from lowest to highest. A wireless carrier is selected from the highest-ranked RSSI (step S208). In step S210, a rough adjustment of the transmission power level is performed. The network initiates a call to the mobile terminal (step S212). A periodic pilot intensity measurement is requested (step S214). In step S216, a determination is made to verify if any macrocell private network (PN) is reported. The process is terminated when a macrocell PN is reported (step S218). If a PN is not reported, then a threshold value comparison is performed (step S220). If a ratio of a received pilot energy value to the total received energy value (Ec/I) is used, the process is completed.<sub>the</sub>If the ratio Ec/I is below a threshold value, then the process is terminated (step S222). Otherwise, if the ratio Ec/I<sub>the</sub> If the transmission power is above a predefined threshold value, then the transmission power is reduced (step S224). Steps S214-S224 are repeated until the macrocell PN is reported and terminated in step S218, or the Ec/Io ratio is below a threshold value and the process is terminated in step S222.
System 100 allows setting adjustable parameters for the 1xRTT network to optimize the power adjustment algorithm of the femto 125 base station. Adjustable parameters may include power levels (e.g., Ec/Io threshold), inter-cell transfer settings (e.g., T-Add, T-Drop, T-Comp thresholds), pilot intensity measurement message periodicity (PPSMM), search windows, filtering constant (e.g., Ec/Io measurements and femto power control step), among other parameters.
An exemplary power adjustment algorithm for the femto 125 base station operating on the 1xEV-DA network is discussed with reference to Figure 3. At initialization, an operations administrator provides a list of valid wireless carriers that are authorized for a pre-selected region (step S302). In step S304, the initial power level (Io) or Received Signal Strength Indication (RSSI) is measured within a selected bandwidth to identify the input signal strength. The RSSI is ranked from lowest to highest (step S306). A wireless carrier is selected from the highest-ranked RSSI (step S308). A rough adjustment of the transmission power level is performed (step S310). In step S312, the network initiates a call to the mobile terminal. A data rate control average (DRC) is evaluated (step S314). In step S316, a determination is made to verify if the DRC is below a threshold. In step S318, the process is terminated when the DRC is below a threshold. If the DRC is not below a threshold, then the transmission power is reduced (step S320). Steps S314-S320 are repeated until the DRC falls below the threshold, and the process is terminated in step S318.
The 100 system allows setting adjustable parameters for the 1xEV-DA network to optimize the power adjustment algorithm of the femto 125 base station. Adjustable parameters can include a DRC threshold and filtering constants for DRC measurements, among other parameters.
An exemplary power adjustment algorithm for the femto 125 base station operating on the 3GPP (LTE) network is discussed with reference to Figure 4. At initialization, an operations administrator provides a list of valid wireless carriers that are authorized for a pre-selected region (step S402). In step S404, the initial power level (Io) or Received Signal Strength Indication (RSSI) is measured within a selected bandwidth to identify the input signal strength. The RSSI is ranked from lowest to highest (step S406). A wireless carrier is selected from the highest-ranked RSSI (step S408). A rough adjustment of the transmission power level is performed (step S410). In step S412, the network initiates a call to the mobile terminal. An average signal quality indicator (CQI) is evaluated (step S414). In step S416, a determination is made to verify if the CQI is below a threshold. In step S418, the process is terminated when the CQI is below a threshold. If the CQI is not below a threshold, then the transmission power is reduced (step S420). Steps S414-S420 are repeated until the CQI falls below the threshold, and the process is terminated at step S418.
The 100 system allows setting adjustable parameters for the 3GPP (LTE) network to optimize the power adjustment algorithm of the femto 125 base station. Adjustable parameters can include a CQI threshold and filtering constants for CQI measurements, among other parameters.
It should be understood that, although the invention is described with reference to the 1xRTT network and EV-DA, the principles of the invention can be adapted by those skilled in the art to migrate between any networks, including other networks such as LTE networks, UMTS networks, WiMAX (802.16) networks, other CDMA2000 networks, and any other networks known in the art or developed later.
The present invention can be implemented in hardware, software, or a combination of hardware and software. Any type of computing system, or other apparatus adapted to perform the methods described in this document, is suitable for performing the functions described in this document.
A typical combination of hardware and software might be a specialized computer system having one or more processing elements and a computer program stored on a storage medium that, when loaded and executed, controls the computer system in such a way that it performs the methods described in this document. The present invention can also be incorporated into a computer program product, which comprises all the features enabling the implementation of the methods described in this document, and which, when loaded into a computer system, is capable of executing these methods. Storage media refers to any volatile or non-volatile storage device.
In the present context, a computer program or application means any expression, in any language, code or notation, of a set of instructions intended to cause a system having an information processing capability to perform a particular function directly or after one or the other or both of the following: a) conversion to another language, code or notation; b) reproduction in a different material form.
Furthermore, unless previously stated otherwise, it should be noted that all attached drawings are out of scale. Significantly, this invention can be incorporated into other specific forms without diverging from its spirit or essential attributes, and in this way, reference should be made to the following claims, rather than to the preceding descriptive report, as indicating the scope of the invention. It will be perceived by those skilled in the art that the present invention is not limited to what has been specifically shown and described above in this document. Furthermore, unless previously stated otherwise, it should be noted that all accompanying drawings are not to scale. A variety of modifications and variations are possible considering the foregoing precepts without departing from the scope and spirit of the invention, which is limited only by the following claims.
4 sheets
Sheet 1 Sheet 2 Sheet 3 Sheet 4
23 members in 7 offices
Priority claims3
| Document | Office | Kind | Date |
|---|---|---|---|
| 61039176 | United States of America | – | |
| 3917608 | United States of America | P | |
| 2009038094 | United States of America | W |
Members23
| Document | Office | Kind | |
|---|---|---|---|
| WO2009120689A2 | World Intellectual Property Organization (WIPO) | A2 | |
| WO2009120689A3 | World Intellectual Property Organization (WIPO) | A3 | |
| EP2260586A2 | European Patent Office (EPO) | A2 | |
| US2011003597A1 | United States of America | A1 | |
| KR20110005686A | Republic of Korea | A | |
| CN101981829A | China | A | |
| JP2011517893A | Japan | A | |
| US8532666B2 | United States of America | B2 | |
| US2014011511A1 | United States of America | A1 | |
| EP2260586A4 | European Patent Office (EPO) | A4 | |
| JP5555687B2 | Japan | B2 | |
| US8818382B2 | United States of America | B2 | |
| JP2014187707A | Japan | A | |
| US2014308969A1 | United States of America | A1 | |
| US9077507B2 | United States of America | B2 | |
| BRPI0908970A2This record | Brazil | A2 | |
| JP5893674B2 | Japan | B2 | |
| KR101607167B1 | Republic of Korea | B1 | |
| JP2016119714A | Japan | A | |
| CN105744612A | China | A | |
| BRPI0908970A8 | Brazil | A8 | |
| EP2260586B1 | European Patent Office (EPO) | B1 | |
| CN105744612B | China | B |
6 legal events, as the office reported them to INPADOC
Over the term
Point at a mark for the eventEvents
| Event | Code | |
|---|---|---|
| Appeal against refusal [chapter 12.2 patent gazette]AppealB12B | B12B | |
| Patent application refused [chapter 9.2 patent gazette]B09B | B09B | |
| Application suspended after technical examination (opinion) [chapter 7.1 patent gazette]B07A | B07A | |
| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]B06U | B06U | |
| Others concerning applications: alteration of classificationA CLASSIFICACAO ANTERIOR ERA: H04B 7/216B15K | B15K | |
| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]B06F | B06F |
Numbers
- Publication
- PI0908970
- Application
- 9089705
Titles2
- Portuguese
- MÉTODO PARA CONTROLAR INTERFERÊNCIA EM IMPLEMENTAÇÃO DE CÉLULA FEMTO
- English
- Method to control interference in femto cell implementation
Classification
- CPC, 8
- H04W52/143
- H04L5/0073
- H04W52/244
- H04W52/243
- H04W52/242
- H04W24/04
- H04W84/045
- H04W72/542
- IPC, 2
- H04B7 216
- H04W72 54