Showing papers by "Stefan Parkvall published in 2012"

Design aspects of network assisted device-to-device communications

Abstract: Device-to-device (D2D) communications underlaying a cellular infrastructure has been proposed as a means of taking advantage of the physical proximity of communicating devices, increasing resource utilization, and improving cellular coverage. Relative to the traditional cellular methods, there is a need to design new peer discovery methods, physical layer procedures, and radio resource management algorithms that help realize the potential advantages of D2D communications. In this article we use the 3GPP Long Term Evolution system as a baseline for D2D design, review some of the key design challenges, and propose solution approaches that allow cellular devices and D2D pairs to share spectrum resources and thereby increase the spectrum and energy efficiency of traditional cellular networks. Simulation results illustrate the viability of the proposed design.

A user equipment and a method therein for transmission power control of uplink transmissions

Abstract: A UE and a method therein for transmission power control of uplink transmissions are provided. The method comprises receiving (810), through signalling a configuration indicating at least one reference signal, RS, and a reference transmission power level for each indicated RS. The method further comprises measuring (820)received power of the indicated at least one RS, and for each measured received power, determining (830)a pathloss, PL, based on the measured received power and the reference transmission power level for each measured received power. The method further comprises determining (840)an uplink transmission power based on at least one determined PL.

Signaling of other-cell signal's configuration information to facilitate interference cancellation at a mobile terminal

Abstract: In MU-MIMO scenarios, a target mobile terminal can be exposed to data streams intended for other mobile terminals. If the target mobile terminal is capable of interference cancellation, then a serving base station can provide the target mobile terminal with interference information so that the target mobile terminal can efficiently cancel interferences due to these interfering data streams. The interference information includes one or more configuration information, each of which characterizes a related interfering data stream. The serving base station provides the interference information over one or more radio resources that are exclusive allocated to the target mobile terminal or are allocated for common listening. The serving base station exchanges configuration information with neighboring base stations over inter-BS links. The inter-BS links use resources that are different from the radio resources used between the base stations and the mobile terminals.

Closed loop power control in a heterogeneous network by selecting among sets of accumulative power step values

Abstract: A method is provided in a wireless device for controlling output transmission power from the wireless device A set is selected among a plurality of sets of power step values, which reside in a memory of the wireless device, responsive to criteria defined in the wireless device A power control command is received from a radio network node One of the power step values of the selected set is selected responsive to the power control command The output transmission power from the wireless device is controlled responsive to the selected power step value Related methods in radio network nodes and apparatuses are disclosed

Network Node, User Equipment and Methods Therein for Transmitting and Receiving Control Information

Abstract: A method in a network node for transmitting control information to a user equipment in a telecommunications system is provided. The control information is scheduled in time intervals of a downlink shared data channel, wherein the control information is allocated resource elements in resource blocks of a time-frequency Orthogonal Frequency Division Multiplexing, OFDM, grid in the time intervals in which the control information is scheduled. The network node determines for a time interval, a set of user equipments for which control information is scheduled in the time interval. Also, it selects for a user equipment comprised in the determined set of user equipments, at least one group of user equipments amongst one or more groups of user equipments to which the user equipment is assigned. It also prepares a group signal corresponding to the selected one group of user equipments by allocating resource elements in the resource blocks of the time interval to the group signal. Furthermore, the network node transmits the prepared group signal in the allocated resource element in the time interval to the user equipment such that the user equipment is enabled to determine whether the control information that is allocated resource elements in the time interval is intended for the user equipment or not. A network node, a method in user equipment and a user equipment are also provided.

Method and apparatus for carrier aggregation

Abstract: The teachings herein provide a number of advantages, including but not limited to improving soft-cell operation in service scenarios involving legacy devices that do not directly support carrier aggregation—i.e., devices that can transmit or receive in only one frequency band at a time. By imposing a Time Division Duplex (TDD) arrangement across two carriers operating in different frequency bands, scheduled transmissions involving the legacy device are mutually exclusive as between the two carriers. Advantageously, the TDD arrangement is imposed across first and second carriers used in the macro- and low-power layers of a soft-cell, thus imposing TDD-based coordination of scheduled transmissions between those carriers irrespective of whether the individual carriers are configured as Frequency Division Duplex (FDD) or TDD carriers, or a mix thereof.

Independent configuration identities in a heterogeneous cellular communication network

Abstract: Systems and methods are disclosed for using multiple configuration groups having corresponding configuration identity (CID) parameters to configure a transmission channel and a reception channel for a user equipment device in a cellular communication network. In one embodiment, a user equipment device in a cellular communication network obtains CID values for CID parameters for a number of configuration groups. Each of the configuration groups includes one or more transmission channel or reception channel parameters. For each of the configuration groups, the user equipment device configures the parameters in the configuration group based on the CID value obtained for the CID parameter for the configuration group. In this manner, the transmission channel and the reception channel for the user equipment device are configured based on multiple CID values rather than a single physical layer cell identifier for a cell in which the user equipment device is located.

Methods and arrangements for network assisted device-to-device communication

Abstract: A method for a first communication device adapted to perform cellular network assisted device-to-device communication is disclosed. A device-to-device communication cluster of a plurality of communication devices comprises the first communication device and one or more other communication devices and a specific one of the plurality of communication devices performs a network control signal gateway function for the device-to-device communication cluster. The network control signal gateway function comprises receiving downlink control signals from a network node of the cellular network, transmitting uplink control signals to the network node of the cellular network, and operating control signaling within the device-to-device communication cluster in association with the downlink and uplink control signals. The method of the communication device comprises deciding whether or not to switch the network control signal gateway function from the specific communication device to another communication device in the plurality of communication devices. The decision is based on link quality measurements of prospect communication links between the network node and the specific communication device and between the network node and the another communication device and/or on link quality measurements of device-to-device communication links between the specific communication device and communication devices, other than the specific communication device, of the plurality of communication devices and between the another communication de communication devices, other than the another communication device, of vice and the plurality of communication devices. Corresponding computer program product, arrangement and communication device are also disclosed.

Search area based control channel monitoring

Abstract: According to an embodiment of the invention, a method of operating a control node for communication with at least one receiving node is provided. The communication is structured in frames comprising several subframes (1) which may be divided into subbands in the frequency domain. The method comprises transmitting a control channel in a search area (8) of one of the subframes (1). The search area (8) comprises a configurable time span and may span one or more of the subbands.

A user equipment supporting communication in a multicarrier radio communication system and a method therein for receiving information

Abstract: A User Equipment, UE, supporting communication in a multicarrier radio communication system and a method therein for receiving information from a Radio Base Station, RBS, are provided. The method comprises determining 310 a bandwidth by which the UE will receive information, the bandwidth comprising a plurality of subcarriers. The method also comprises adjusting 320 a bandwidth of the UE to correspond to the determined bandwidth by which the UE will receive information; and fine tuning 330 a local oscillator of the UE such that a centre frequency of a local oscillator does not coincide with a predetermined subcarrier transmitted from the RBS.

Methods and apparatuses for radio resource management

Abstract: A radio resource allocation method in a communication node is disclosed. The method comprises determining (424) that a first time reference or a fist communication using a first component carrier has a time shift compared to a second time reference of a second communication using a second component carrier. The method further comprises determining (426) a duration of a communication sub-frame based on the time shift, and scheduling (428) the determined communication sub-frame on a first component carrier to a first communication device. The determined frame duration is equal to the time shift or equal to the normal sub-frame length minus the time shift so as to avoid any overlap or interference. Corresponding computer program product, arrangement, communication node and first communication device are also disclosed.

Network nodes, devices and methods therein for enabling device to device communication

Abstract: Embodiments herein relate to a method in a first network node (16) for enabling device to device, D2D, communication between a first device (10) and a second device (13). The first device (10) is served by a first public land mobile network comprising the first network node (16) and the second device (13) is served by a second public land mobile network. The first network node (16) receives, from the second device (13), via the second public land mobile network, or from the first device (10), a request for permission for the second device (13) of roaming to the first public land mobile network enabling the D2D communication. The request requests access to a resource controlled by the first network node (16) of the first public land mobile network. The first network node (16) decides whether to grant the request based on a position related information of the second device (13) and/or the first device (10).

User equipment, a network node, and methods for device discovery in device-to-device (d2d) communications in a wireless telecommunications network

Abstract: A method in a first user equipment (121) for adjusting a beacon signal (140) to be detected by at least one second user equipment (122) in a wireless telecommunications network (100) is provided. The beacon signal (140) is transmitted in order to enable an establishment of Device-to-Device, D2D, communication between the first user equipment (121) and the at least one second user equipment (122). The method is characterized in that the method comprises adjusting (205), prior to transmitting the beacon signal (140), the transmit power of the beacon signal (140) based on a requirement of an application in the first user equipment (121) for which the D2D communication is to be established. A user equipment (121), a network node (110), and a method in a network node (110) for enabling a D2D communication between a first user equipment (121) and at least one second user equipment (122) are also provided.

Determining timing of feedback information in wireless networks realised in different technologies

Abstract: The invention relates to a method in a user equipment 4 for determination of timing of a Hybrid Automatic Repeat re-Request, HARQ, response. The user equipment 4 operates in a communication network 1 comprising a primary radio access technology system 2and a secondary radio access technology system 3. The user equipment 4 receives on at least one downlink carrier on the first radio access technology system 2 and on at least one downlink carrier on the second radio access technology system 3. The method comprises determining a downlink timing related to the secondary radio access technology system 3; determining a virtual uplink timing for HARQ response on the secondary radio access technology system 3 based on the downlink timing; determining an uplink timing related to the primary radio access technology system 2; and determining, based on the virtual uplink timing and the uplink timing for the primary radio access technology system 2, an uplink time instance for transmission of the HARQ response on an uplink carrier of the primary radio access technology system 2, wherein the HARQ response relates to data received on the downlink carrier on the secondary radio access technology system 3. The invention also relates to user equipment, radio base stations and methods therein.

Methods and devices for reporting a downlink channel quality

Abstract: The invention relates to a method (90) in a user equipment (4) for reporting a downlink channel quality in a communication system (1) comprising a first radio access technology system (2) and a second radio access technology system (3). The user equipment (4) is in connection with a primary serving cell on the first radio access technology system (2) and with a secondary serving cell on the second radio access technology system (3). The method (90) comprises: determining (110) channel quality for the second radio access technology system (3) using an indicator format of the radio access technology of the second radio access technology system (3); mapping (120) an indicator of the channel quality having the indicator format of the second radio access technology to an indicator format used for channel quality indicators in the first radio access technology system (2); and transmitting (130) the indicator of the channel quality for the second radio access technology system (3) to the communication system (1) using the indicator format of the first radio access technology on an uplink carrier of the first radio access technology system (2). The invention also relates to a user equipment, methods in a network node and a network node.

Technique for operating a network node in a heterogeneously deployed network

Abstract: A technique for operating a network node in a heterogeneously deployed network comprising network nodes of different nominal transmit powers and at least partially overlapping coverage areas is described. A method implementation of this technique comprises a step of operating the network node in a base mode in which the network node is configured to transmit terminal-specific demodulation reference signals for a first set of terminal devices. The method comprises the further step of selectively activating or deactivating operation of the network node in a Single Frequency Network (SFN) mode in which the network node is configured to transmit, for a second set of terminal devices, the same cell-specific reference nodes as a another network node of the heterogeneously deployed network that has a larger nominal transmit power.

Base station and method for determining a spectrum allocation in a wireless network

Abstract: A method in a first base station for determining a spectrum allocation to be used by the first base station in a wireless network is provided. The wireless network is dedicated a spectrum S. The first base station is associated with a first operator. The first base station detects (403) a number N of second signals. Each second signal is transmitted by a respective second base station to announce its intended use of said spectrum at a time t. Each second base station is associated with a respective second operator or the first operator. The first base station then determines (404) the spectrum allocation to be used by the first base station at the time t as a subset of the spectrum S. The subset of the spectrum S is a function of N.

Technique for operating communication devices in a heterogeneously deployed network

Abstract: A technique for operating a wireless communication device in a heterogeneously deployed network comprising first and second serving nodes of different nominal transmit powers and at least partially overlapping coverage areas is described. The communication device is simultaneously connected to the first and second serving nodes (e.g., in accordance with a soft cell scenario) and alternately communicates with the first and second serving nodes in accordance with a communication pattern comprising communication periods and communication pauses. A method aspect of this technique, as performed by the wireless communication device, comprises detecting an event that requires an extension of the communication period with the first serving node, and transmitting a notification message to the second serving node. The notification message is indicative of a required extension of a communication pause with the second serving node.

Methods and nodes for soft cell uplink prioritization

Abstract: The invention relates to a method in a wireless device for mapping a logical channel to one of a first and a second link. The first link is maintained to a first radio network node and the second link is maintained to a second radio network node. The method comprises obtaining (910) information indicating to which of the first and the second links one or more of at least one logical channel is mapped. The method also comprises selecting (920) a logical channel among the at least one logical channel, and mapping (930) the selected logical channel to one of the first and the second links based on the obtained information. The invention also relates to a corresponding method in the first radio network node.

Interference control between different radio communication systems involving user equipments

Abstract: A first User Equipment (UE), a second UE, a first Radio Network Node (RNN), and methods therein for controlling interference between transmissions in a first system and transmissions in a second system. The first system comprises the first UE and the first RNN serving the first UE. The second system comprises the second UE and a second RNN serving the second UE. The first system has a first priority in a first part of a shared spectrum and the second system has a second priority in the first part of the shared spectrum, wherein the first priority is higher than the second priority. The method in the first UE comprises transmitting a signal to a second RNN that is to perform a downlink transmission to the second UE, which signal is configured to control the transmission of the second RNN.

Identification of subcarrier diversion

Abstract: FIELD: information technologies. ^ SUBSTANCE: cellular communication system, which applies orthogonal frequency division in its radio interface, may use either the first diversion of subcarriers or the second diversion of subcarriers. The one used at the moment is indicated by generation of the first type of a sync signal, in response to the first diversion of subcarriers used at this moment, and generation of the second type of a sync signal in response to the second diversion of subcarriers used at the moment. Any of the generated first type of the sync signal and the second type of the sync signal is transmitted. To differentiate between the first and second types of sync signals, provision of the time area of the second type of the sync signal includes multiple copies of the first type of the sync signal. ^ EFFECT: reduced time of cell searching. ^ 22 cl, 10 dwg

Method and arrangement for relaying in case of extension areas having uplink/downlink imbalance

Abstract: Underlay network node and macro base station and methods therein for enabling avoidance of interference in a cell extension area associated with an uplink/downlink imbalance. The underlay network node is assumed to be associated with a cell area A, and a cell extension area B, where the cell extension area B has an uplink/downlink imbalance in relation to a neighboring base station and the network node. The method in the underlay network node involves serving a UE in both uplink and downlink when the UE is located in cell area A. The method further involves serving a UE only in the uplink when the UE is located in cell extension area B, thus enabling avoidance of interference related to communication of a UE located in said cell extension area B.

Selecting antennas in downlink cooperative scheduling

Abstract: It is presented a method for obtaining a set of selected antennas in a mobile communication network, wherein each one of the selected antennas is intended to be used in data transmissions to a first mobile communication terminal. The method is performed in a network node of the mobile communication network and comprises candidate the steps of: obtaining a set of candidate antennas, wherein each one of the candidate antennas is arranged to send out the same cell identifier and at least some of the candidate antennas have different coverage areas; evaluating performance of at least a subset of the candidate antennas in relation to the first mobile communication terminal; and determining a set of selected antennas based on the performance of the candidate performance antennas having been evaluated. A corresponding network node, computer program and computer program product are also presented.

Discovery in Device-to-Device Communication

Abstract: A method in a base station comprising a memory storing one or more service types and a radio interface that communicates with a device The method includes arranging a service scheduling by assigning at least one time slot to a service type and transmitting information on said service scheduling to a device

A Radio Network Controller, A Serving Base Station, A User Equipment and Methods Therein

Abstract: A radio network controller, RNC, 614, and a method therein, for enhancing reception quality of transmissions on an uplink control channel from a user equipment, UE, 613 to a serving base station, BS, 610. The RNC, the UE and the serving BS are comprised in a communication system 600. The method comprises, when conditions for boosting the uplink control channel are fulfilled, determining a boosting factor based on a ratio of path gains of a channel from the UE to the serving BS and of a channel from the UE to a non- serving BS 611, respectively, which non-serving BS is comprised in the communications system. The method further comprises transmitting the determined boosting factor to the UE, whereby the reception quality of transmission on the uplink control channel from the UE to the serving BS is enhanced by the UE boosting the control channel by means of the boosting factor.

Method of autonomous transmission for extended coverage

Abstract: PROBLEM TO BE SOLVED: To advantageously maintain synchronism, a current channel structure and a current coding system, and perform autonomous re-transmission for an E-DCH channel.SOLUTION: A user equipment unit is configured for operation with a synchronous HARQ protocol and with capability of sending data on an E-DCH channel either (1) in a nominal mode in single transmission time intervals of a predetermined length, or (2) in an extended mode in a pseudo transmission time interval. The pseudo transmission time interval comprises a first transmission time interval in which the data is transmitted and a second transmission time interval in which the data is re-transmitted. The second transmission time interval is consecutive to the first transmission time interval, and the first transmission time interval and the second transmission time interval are each of the (same) predetermined length.

Localised or distributed transmission

Abstract: FIELD: information technology. ^ SUBSTANCE: transmission facilities on shared downlink cannel are divided into blocks of resources where each block of resources includes predetermined number of subcarriers during predetermined time period. Blocks of resources are subdivided into localised blocks of resources and distributed blocks of resources. User requiring sufficient amount of resources can get multiple above mentioned localised blocks of resources. User who require only small quantity of above mentioned localised blocks of resources can get instead of them multiple submodules of above mentioned distributed blocks of resources. ^ EFFECT: higher transmission channel capacity. ^ 17 cl, 4 dwg

Using enable of uplink as start-up of first or second type of cqi message

Abstract: FIELD: information technologies. ^ SUBSTANCE: channel status feedback is provided from UE (800) to a basic station (700) as the first detailed or second less detailed type of channel status feedback information. At first it is identified (403), where UE has accepted the uplink enable or not from a basic station. If UE has accepted the uplink enable, the first type of channel status feedback data is sent (404) to a basic station in an enabled resource. However, if UE has not accepted the uplink enable, the second type of channel status feedback data is sent (405) to a basic station. ^ EFFECT: different types of channel status feedback information make it possible for UE and a related basic station use available resources more efficiently when requesting and delivering channel condition feedback information. ^ 31 cl, 11 dwg

Inter-layer interference handling in heterogeneous networks

Abstract: In a heterogeneous network cell deployment a mobile terminal may need to receive control data transmissions from a macro node at the same time as a pico node is transmitting user data for the mobile terminal, using the same frequency or set of frequencies. This can result in a problematic interference situation. According to several embodiments of the present invention, at least one of two general approaches is used to mitigate the interference situation described above. In a first approach, the pico node's transmission power is reduced in some time intervals, thereby reducing the interference to a level where reception from the macro node is possible. In a second approach, which may be combined with the first approach in some cases, relevant data (e.g. control information) transmitted from the macro node is provided by the pico node, either alone or in combination with the macro node (i.e. simultaneously to the macro node during the same protected transmission time intervals).

Methods and devices for determining timing of feedback information

Abstract: The invention relates to a method in a user equipment 4 for determination of timing of a Hybrid Automatic Repeat re-Request, HARQ, response. The user equipment 4 operates in a communication network 1 comprising a primary radio access technology system 2 and a secondary radio access technology system 3. The user equipment 4 receives on at least one downlink carrier on the first radio access technology system 2 and on at least one downlink carrier on the second radio access technology system 3. The method comprises determining a downlink timing related to the secondary radio access technology system 3; determining an uplink timing related to the primary radio access technology system 2; and determining an uplink time instance for transmission of the HARQ response on an uplink carrier of the primary radio access technology system 2, wherein the HARQ response relates to data received on the downlink carrier on the secondary radio access technology system 3 and wherein the uplink time instance for transmission of the HARQ response is based on an uplink timing for a HARQ response on the secondary radio access technology system 3 and the downlink timing related to the secondary radio access technology system 3. The invention also relates to user equipment, radio base stations and methods therein.