Patents by Inventor Kristina Zetterberg
Kristina Zetterberg has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Patent number: 8583104Abstract: A telecommunications system comprises a serving radio base station and a candidate radio base station which are different with respect to at least one of frequency and radio access technology. The serving radio base station comprises a radio base station to which a wireless mobile station provides measurement reports. A method comprises the serving radio base station allowing the mobile station to obtain information broadcasted by the candidate radio base station. The information is either information for locating Cell Global Identity (CGI) of the candidate radio base station or the Cell Global Identity (CGI) itself of the radio base station. The mobile station obtains the information from the candidate radio base station during at least one reading gap. The reading gap is a time period in which the mobile station does not receive information from the serving radio base station.Type: GrantFiled: October 26, 2011Date of Patent: November 12, 2013Assignee: Telefonaktiebolaget L M Ericsson (publ)Inventors: Mehdi Amirijoo, Pål Frenger, Fredrik Gunnarsson, Harald Kallin, Johan Moe, Kristina Zetterberg
-
Publication number: 20130115959Abstract: Handover (HO) statistics and handover issue events which are due to non-mobility causes are not included in the statistics fed into mobility robustness optimization (MRO). The non-mobility causes may include, e.g., load balancing, retracting users to prepare for cell maintenance or restart/reconfiguration and cell outage including compensation means. Radio link failure (RLF), handover failure (HOF), and handover oscillations (HOosc) that are due to non-mobility cause are excluded from the statistics upon which mobility robustness optimization is based. Non-mobility causes are also differentiated from mobility causes when reporting key performance indicators to an operator.Type: ApplicationFiled: March 22, 2012Publication date: May 9, 2013Inventors: Mehdi Amirijoo, Fredrik Gunnarsson, Birgitta Olin, Johan Moe, Kristina Zetterberg
-
Patent number: 8417244Abstract: A device detects poor coverage associated with a source radio access technology (RAT) with which the device is connected, and connects to a target RAT. The device also measures the source RAT for a time period after connecting to the target RAT, and sends, based on the measurements, one or more measurement reports to the target RAT, where the target RAT forwards the one or more measurement reports to the source RAT. Alternatively, or additionally, the target RAT may detect that the handover was triggered too early and may inform the source RAT or command the UE to return to the source RAT. The device further stops the measuring and the sending when the time period expires. In this way, IRAT handover parameters may be automatically or manually tuned to minimize the number of handovers triggered too early, which may result in a more efficient cell configuration.Type: GrantFiled: April 23, 2010Date of Patent: April 9, 2013Assignee: Telefonaktiebolaget L M Ericsson (publ)Inventors: Jose Alonso-Rubio, Kristina Zetterberg
-
Patent number: 8295848Abstract: The present invention relates to a method and a communication network node for automatically tuning a PRACH configuration parameter in a communication network system comprising radio base stations each serving at least one cell and with which user equipments are communicating on uplink and downlink channels. The PRACH configuration parameter is used for defining the division of uplink resource blocks between PRACH and PUSCH. Load statistics on RACH and PUSCH are collected used for determining a number of RACH opportunities required per time unit. Then a new PRACH configuration parameter having said required number of RACH opportunities per time unit is selected which is replacing the old PRACH configuration parameter.Type: GrantFiled: July 2, 2008Date of Patent: October 23, 2012Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Pål Frenger, Mehdi Amirijoo, Fredrik Gunnarsson, Kristina Zetterberg, Johan Moe
-
Patent number: 8238920Abstract: Automatic setting and/or adjusting of the threshold(s) for triggering measurements of signal strength/quality of other RATs that are needed for IRAT mobility is described. The setting and/or adjusting of the threshold(s) triggering IRAT measurements is automatically optimized and preferably performed for each BS. Initially, constraints on the optimization of the IRAT measurement triggering threshold(s) are set, and a start value for the optimization of the IRAT measurement triggering threshold(s) is provided or determined. Input information needed for the optimization of the IRAT measurement triggering threshold(s) are then collected, and new IRAT measurement triggering threshold(s) are determined and set or existing IRAT measurement triggering threshold(s) are adjusted if appropriate.Type: GrantFiled: January 20, 2010Date of Patent: August 7, 2012Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Kristina Zetterberg, Jose Alonso-Rubio
-
Publication number: 20120164955Abstract: In a method and an apparatus for determining when a cell of a cellular radio system can enter a discontinuous transmission mode is provided. By evaluating qualities from both the cell and neighboring cells for a number of positions and calculating a statistically expected quality distribution of the evaluated qualities conditioned on that certain cells are in discontinuous transmission mode it is possible to generate a distribution which can be compared with at least one requirement thresholds. Based on the comparison it is possible to determine if first cell can use discontinuous transmission mode and still fulfill the requirements.Type: ApplicationFiled: September 10, 2009Publication date: June 28, 2012Applicant: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)Inventors: Mehdi Amirijoo, Pål Frenger, Harald Kallin, Johan Moe, Kristina Zetterberg
-
Publication number: 20120163238Abstract: In a cellular radio system a message indicating a change of cell size can be transmitted to a number of affected cells, in particular, neighboring cells. The affected cells receiving such a message can be adapted to use the information in the message when determining self-optimization parameters used for control purposes. Hereby, better response times can be achieved without reducing noise sensitivity.Type: ApplicationFiled: September 9, 2009Publication date: June 28, 2012Applicant: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)Inventors: Fredrik Gunnarsson, Mehdi Amirijoo, Pal Frenger, Johan Moe, Kristina Zetterberg
-
Publication number: 20120064897Abstract: A telecommunications system comprises a serving radio base station and a candidate radio base station which are different with respect to at least one of frequency and radio access technology. The serving radio base station comprises a radio base station to which a wireless mobile station provides measurement reports. A method comprises the serving radio base station allowing the mobile station to obtain information broadcasted by the candidate radio base station. The information is either information for locating Cell Global Identity (CGI) of the candidate radio base station or the Cell Global Identity (CGI) itself of the radio base station. The mobile station obtains the information from the candidate radio base station during at least one reading gap. The reading gap is a time period in which the mobile station does not receive information from the serving radio base station.Type: ApplicationFiled: October 26, 2011Publication date: March 15, 2012Applicant: Telefonaktiebolaget LM Ericsson (publ)Inventors: Mehdi Amirijoo, Pål Frenger, Fredrik Gunnarsson, Harald Kallin, Johan Moe, Kristina Zetterberg
-
Patent number: 8107950Abstract: In one of its aspects the technology concerns a method of operating a telecommunications system comprising a serving radio base station and a candidate radio base station. The serving radio base station comprises a radio base station to which a wireless mobile station provides measurement reports. The serving radio base station and the candidate radio base station are different with respect to at least one of frequency and radio access technology. The method comprises the serving radio base station allowing the mobile station to obtain information broadcasted by the candidate radio base station. The information is either information for locating Cell Global Identity (CGI) of the candidate radio base station or the Cell Global Identity (CGI) itself of the radio base station. The mobile station obtains the information from the candidate radio base station during at least one reading gap.Type: GrantFiled: December 10, 2008Date of Patent: January 31, 2012Assignee: Telefonaktiebolaget LM Ericsson (Publ)Inventors: Mehdi Amirijoo, Pål Frenger, Fredrik Gunnarsson, Harald Kallin, Johan Moe, Kristina Zetterberg
-
Patent number: 8095143Abstract: A device obtains a service change associated with a cell in a radio network, and identifies helper cells in the radio network that need new random access channel (RACH) parameters due to the service change. The device also determines a RACH parameters configuration for the helper cells, and configures the helper cells with the determined RACH parameters configuration.Type: GrantFiled: February 13, 2009Date of Patent: January 10, 2012Assignee: Telefonaktiebolaget L M EricssonInventors: Mehdi Amirijoo, Pål Frenger, Fredrik Gunnarsson, Johan Moe, Kristina Zetterberg
-
Publication number: 20110263255Abstract: A device detects poor coverage associated with a source radio access technology (RAT) with which the device is connected, and connects to a target RAT. The device also measures the source RAT for a time period after connecting to the target RAT, and sends, based on the measurements, one or more measurement reports to the target RAT, where the target RAT forwards the one or more measurement reports to the source RAT. Alternatively, or additionally, the target RAT may detect that the handover was triggered too early and may inform the source RAT or command the UE to return to the source RAT. The device further stops the measuring and the sending when the time period expires. In this way, IRAT handover parameters may be automatically or manually tuned to minimize the number of handovers triggered too early, which may result in a more efficient cell configuration.Type: ApplicationFiled: April 23, 2010Publication date: October 27, 2011Applicant: TELEFONAKTIEBOLAGET LM ERICSSONInventors: Jose ALONSO-RUBIO, Kristina ZETTERBERG
-
Publication number: 20110235529Abstract: The present invention relates to a method and a communication network node for enabling automatic optimization of a random access preamble format usage in a communication network system. The network comprises the communication network node serving at least one cell to which user equipments are accessing. A random access preamble format is set for each cell and comprises a random access sequence length, TSEQ, and a random access preamble cyclic prefix length, TCP. First, the random access sequence length, TSEQ is selected and then the random access preamble cyclic prefix length, T CP is selected. Based on the selected random access sequence length, T SEQ and random access preamble cyclic prefix length, TCP, which random access preamble format to use in said cell is selected.Type: ApplicationFiled: December 5, 2008Publication date: September 29, 2011Applicant: Telefonaktiebolaget L M Ericsson (publ)Inventors: Kristina Zetterberg, Mehdi Amirijoo, Pal Frenger, Fredrik Gunnarsson, Johan Moe
-
Publication number: 20110176430Abstract: Automatic setting and/or adjusting of the threshold(s) for triggering measurements of signal strength/quality of other RATs that are needed for IRAT mobility is described. The setting and/or adjusting of the threshold(s) triggering IRAT measurements is automatically optimized and preferably performed for each BS. Initially, constraints on the optimization of the IRAT measurement triggering threshold(s) are set, and a start value for the optimization of the IRAT measurement triggering threshold(s) is provided or determined. Input information needed for the optimization of the IRAT measurement triggering threshold(s) are then collected, and new IRAT measurement triggering threshold(s) are determined and set or existing IRAT measurement triggering threshold(s) are adjusted if appropriate.Type: ApplicationFiled: January 20, 2010Publication date: July 21, 2011Applicant: Telefonaktiebolaget LM Ericsson (publ)Inventors: Kristina Zetterberg, Jose Alonso-Rubio
-
Publication number: 20110165874Abstract: A method and a communication network node for satisfying detection miss probability and false detection probability requirements in a random access channel used by mobile stations (MS) for accessing a communication network system comprising radio base stations (BS) each serving at least one cell (19). The method includes optimizing a random access channel, wherein the method performs estimating detection miss probability (P m) in said cell, tuning random access parameters such that said estimated detection miss probability satisfies predetermined requirements, estimating a false detection probability (P f) in said communication cell (19), tuning said random access parameters such that said estimated false detection probability satisfies predetermined requirements, and tuning said random access parameters such that an extensive interference caused by mobile stations attempting random access in said communication cell is avoided.Type: ApplicationFiled: September 11, 2008Publication date: July 7, 2011Applicant: Telefonaktiebolaget LM Ericsson (publ)Inventors: Mehdi Amirijoo, Pål Frenger, Fredrik Gunnarsson, Johan Moe, Kristina Zetterberg
-
Publication number: 20110098035Abstract: The present invention relates to a method and a communication network node for automatically tuning a PRACH configuration parameter in a communication network system comprising radio base stations each serving at least one cell and with which user equipments are communicating on uplink and downlink channels. The PRACH configuration parameter is used for defining the division of uplink resource blocks between PRACH and PUSCH. Load statistics on RACH and PUSCH are collected used for determining a number of RACH opportunities required per time unit. Then a new PRACH configuration parameter having said required number of RACH opportunities per time unit is selected which is replacing the old PRACH configuration parameter.Type: ApplicationFiled: July 2, 2008Publication date: April 28, 2011Inventors: Pål Frenger, Mehdi Amirijoo, Fredrik Gunnarsson, Kristina Zetterberg, Johan Moe
-
Publication number: 20100210255Abstract: A device obtains a service change associated with a cell in a radio network, and identifies helper cells in the radio network that need new random access channel (RACH) parameters due to the service change. The device also determines a RACH parameters configuration for the helper cells, and configures the helper cells with the determined RACH parameters configuration.Type: ApplicationFiled: February 13, 2009Publication date: August 19, 2010Applicant: TELEFONAKTIEBOLAGET LM ERICSSONInventors: Mehdi Amirijoo, Pal Frenger, Fredrik Gunnarsson, Johan Moe, Kristina Zetterberg
-
Publication number: 20090191862Abstract: In one of its aspects the technology concerns a method of operating a telecommunications system comprising a serving radio base station and a candidate radio base station. The serving radio base station comprises a radio base station to which a wireless mobile station provides measurement reports. The serving radio base station and the candidate radio base station are different with respect to at least one of frequency and radio access technology. The method comprises the serving radio base station allowing the mobile station to obtain information broadcasted by the candidate radio base station. The information is either information for locating Cell Global Identity (CGI) of the candidate radio base station or the Cell Global Identity (CGI) itself of the radio base station. The mobile station obtains the information from the candidate radio base station during at least one reading gap.Type: ApplicationFiled: December 10, 2008Publication date: July 30, 2009Applicant: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)Inventors: Mehdi AMIRIJOO, PAL FRENGER, Fredrik GUNNARSSON, Harald KALLIN, Johan MOE, Kristina ZETTERBERG