Showing papers by "Stefan Parkvall published in 2010"

Determining configuration of subframes in a radio communications system

Abstract: The technology disclosed provides the ability for a subframe to be configured as a “flexible” subframe As a result, at least three different types of subframes in a TDD system may be configured: a downlink (“DL”) subframe, an uplink (“UL”) subframe, and a “flexible” subframe The use of flexible subframes is determined based on a primary TDD configuration, and in a preferred example, on the existing primary TDD configuration in the network If there is secondary TDD configuration, flexible subframes may be determined based on both the primary and secondary configurations, eg, using specific rules Also, the HARQ feedback timing for downlink (DL) transmissions may be determined based on the secondary TDD configuration Preferred examples ensure that uplink (UL) feedback does not collide with a flexible subframe used for DL transmission The technology preferably is compatible with legacy UEs

Pucch resource allocation for carrier aggregation in lte-advanced

Abstract: The invention is a method and apparatus for signaling uplink control information in a mobile communication network using carrier aggregation. The signaling mechanism allows the transmission, on a single uplink component carrier, of control information associated with a downlink transmission on multiple aggregated downlink component carriers. Semi-statically reserved resources for the transmission of control information on the uplink component carrier may be dynamically shared byuser terminals that are assigned multiple downlink component carriers for downlink transmissions. Implicit or explicit resource indication can be used in combination with dynamic resource indication.

Methods and nodes for setting values of system parameters used in a wireless communication system

Abstract: Method in a user equipment (120), a user equipment (120), a method in a base station (110) and a base station (110) for setting values of system parameters used within a wireless communication system (100). A first set of parameter values and an associated first tag is sent from the base station (110) to be received and stored by the user equipment (120). Further, a second set of parameter values and an associated second tag is sent from the base station (110) to be received and stored by the user equipment (120). When the base station (110) determine to change system information parameters, a command tag is sent, to be received by the user equipment (120), which apply the set of parameter values associated with the tag corresponding to the received command tag.

Method and arrangement in a telecommunication network with intercell interference coordination

Abstract: Methods and arrangements in a telecommunication network for intercell interference coordination. The telecommunication network comprises a first base station, acting as serving base station for a mobile station, and a second base station. The method comprises determining that transmission interference to the mobile station is to be limited. The method also comprises triggering the mobile station to send a signal on a radio resource, which signal is to be received by the second base station, enabling the second base station to select a transmission parameter that limits interference for the mobile station.

Method and arrangement for reconfiguring mapping of carrier indicator field to component carrier

Abstract: A method and an arrangement 400 in a radio network node for reconfiguring mappings from Carrier Indicator Field-values to component carriers are provided. Each CIF-value is mapped to a respective component carrier comprising a respective shared data channel. Each respective shared data channel corresponds to at least one downlink control channel carrying said each CIF-value. The radio network node 130 reconfigures mappings from CIF-values to component carriers, while at least one mapping of CIF- value to component carrier is maintained. The component carrier of said at least one mapping from CIF-value to component carrier comprises said at least one downlink control channel and a shared data channel corresponding to said at least one downlink control channel. The radio network node 130 sends at least one of the reconfigured mappings from CIF-values to component carriers to the user equipment 120.

Method and apparatus for controlling energy consumption in a multi-antenna base station

Abstract: The present invention relates generally to a method for use in a radio base station of a wireless communications network and to an energy control apparatus (210), more particularly to a method for reducing energy consumption in a multi-antenna multi-port radio base station (220) of a multi-input multi-output wireless communications network. The radio base station (220) is serving a cell (230) and comprising at least two antenna ports (240a; 240b; 240c; 240d) dedicated for that cell (230). The method comprises measuring a load in the cell (230) and comparing the measured load with a defined load value. The method also comprises muting a downlink transmission power transmitted on at least one of the at least two antenna ports (240a; 240b; 240c; 240d) when the measured load is below the defined load value, and thereby reducing energy consumption.

LTE evolution towards IMT-advanced and commercial network performance

Abstract: This paper provides a high-level overview of Long Term Evolution (LTE) Rel-10, sometimes referred to as LTE-Advanced. First, a brief overview of LTE and some of its technologies are given and then the International Mobile Telecommunications (IMT)-Advanced requirements are discussed. LTE Rel-10 enhances the LTE with carrier aggregation, improved multi-antenna support, relaying and improved support for heterogeneous deployments. The paper is concluded with measurements from the first commercial LTE network, showing that live LTE network performance is well aligned with expectations.

Methods and apparatus for resource management in a multi-carrier telecommunications system

Abstract: The embodiments of the present invention relate to apparatuses and methods for resource management in a multi-carrier system wherein a plurality of component carriers (CCs) is defined per cell. According to a method in an apparatus corresponding to a radio base station, a message is assembled comprising information on the structure of the cell served by the radio base station; the information including one or more CCs used in the cell that is/are available for a user equipment for performing initial access in the cell. The method also comprises, transmitting the assembled message to the user equipment and indicating to the user equipment to what resources to use for random access in the cell. The exemplary embodiments of the present invention also relates to a method in the user equipment, to a radio base station and to a user equipment.

Switching between Open and Closed Loop Multi-Stream Transmission

Abstract: The present invention relates to a method and apparatus for multi-stream wireless communication between a transmitter node and a receiver node. The method comprises applying an open-loop multi-stream transmission technique during an initial part of a transmission burst. In another step of the method, detailed channel state information is received (54). The detailed channel state information indicates transmission pre-coding to be used during the transmission burst when applying a closed-loop multi-stream transmission technique. The method further includes switching (55) from the open-loop multi-stream transmission technique to the closed-loop multi-stream transmission technique during the transmission burst, in response to receiving the detailed channel state information. The method is applicable to both uplink and downlink transmission bursts.

Synchronization in heterogeneous networks

Abstract: In a mobile communication network comprising a pico base station and macro base station with overlapping coverage areas, the pico base station transmits a supplemental synchronization signal to enable synchronization when the mobile terminal is operating within a link imbalance zone. The supplemental synchronization signal is transmitted using different time, frequency, and/or code resources from the primary and/or secondary synchronization signals to differentiate and separate the supplemental synchronization signals.

Methods and devices for radio access management of carrier aggregation between heterogeneous wireless networks

Abstract: A method for managing radio access comprises sending (210-211) of a radio access technology -RAT- resource aggregation request from a first radio access network -RAN- to a second RAN concerning communication with a user equipment connected to a source RAN, and returning (212-213) a response to the first RAN. The source RAN is the first or second RAN. The first and second RANs use different radio access technologies. Radio resources of a base station in a target RAN, the RAN to which the user equipment is not connected, are reserved (214). A report of the reserved radio resources is sent (216-217) to the source RAN. A RAT resource aggregation command is transmitted (218) to the user equipment. The RAT resource aggregation command comprises that a RAT resource aggregation shall be used and the reserved radio resources. The base stations have at least partly overlapping coverage areas.

Power efficient data transmission

Abstract: Teachings herein schedule a data transmission in a variable bandwidth wireless communication system based on the power efficiency of a mobile node. One or more processing circuits, of the mobile node or a network node, determine the value of a control setting that defines a power efficiency configuration of the mobile node. In one embodiment, for example, the power efficiency configuration indicates the mobile node is configured to operate at the maximum power efficiency attainable without the data rate of the data transmission falling below a minimum data rate required by a quality of service. Regardless, the one or more processing circuits select from different possible bandwidths of the data transmission a bandwidth that supports a given data rate and that, according to a power efficiency model that models power efficiency of the mobile node for the different possible bandwidths, yields a power efficiency comporting with the power efficiency configuration.

Methods providing signal synchronization and related networks and devices

Abstract: A method of providing signal synchronization for a radio access network may include transmitting a first carrier (1410) including synchronization signals on a first frequency from the radio access network. Information relating the first carrier on the first frequency with a second carrier on a second frequency (1440) may be transmitted from the radio access network, with this information being intended to be used in synchronization by a wireless terminal upon addition of the second carrier. More particularly, the first and second frequencies may be different. A command to add the second carrier as a downlink (1450) for transmissions may be transmitted to the wireless terminal (110-1). Related network nodes and wireless terminals are also discussed.

Methods and nodes in a wireless communication network

Abstract: First network node 110 and method in the first network node 110 for configuring a second network node 120 to operate either in cell mode or in beam mode when communicating with a user equipment 130, 140. The method comprises obtaining information for determining the operative mode of the second network node 120, comparing the obtained information with a threshold value, determining the operative mode of the second network node 120, based on the made comparison, and configuring the second network node 120 in cell mode or in beam mode, in relation to the user equipment 130,140, according to the determined operative mode of the second network node 120. A user equipment 130, 140 and a method in a user equipment 130, 140 is also disclosed.

TD-LTE — The radio-access solution for IMT-Advanced/TDD

Abstract: This paper provides a discussion on the LTE radio-access technology as defined in 3GPP, with specific focus on its TDD component (TD-LTE). Some specific characteristics of TDD, such as interference between uplink and downlink as well as channel reciprocity, are outlined. A discussion on possible evolution paths for the TD-LTE radio-access technology is also presented. Finally, an overview of the performance and capabilities of TD-LTE, in relation to the requirements on IMT-Advanced, is provided.

Scheduling Data Transmissions Between a Mobile Terminal and a Base Station in a Wireless Communications Network Using Component Carriers

Abstract: A method of scheduling wireless data transmissions between a mobile terminal (701) and a base station using multiple component carrier signals is disclosed. The method comprises the steps of: receiving in the mobile terminal information from the base station indicating available component carriers; detecting in the mobile terminal at least one dynamic parameter indicative of the mobile terminal's current ability to handle component carriers having non-contiguous bandwidths; determining in the mobile terminal in dependence of the at least one dynamic parameter which of the available component carriers to utilize; and transmitting from the mobile terminal to the base station information indicating the component carriers determined to utilize. By doing this the mobile terminal may choose to limit the number of component carriers used in situations where it is disadvantageous, such as situations where the power consumption of supporting multiple component carriers is high or situations where complex hardware is needed.

Compromise resource allocation field size when aggregating component carriers of differing size

Abstract: Methods and arrangements for resource allocation in a telecommunication system in which aggregation of component carriers is applied. The size of the resource allocation field is determined based on the transmission bandwidth of a selection of component carriers. The selection of component carriers comprises the component carrier on which the resource allocation message is monitored and the component carriers which are cross-scheduled from said component carrier. The resource allocation message comprising the resource allocation field with the determined size is transmitted to the user equipment over a particular component carrier of the selection of component carriers. Furthermore, with only one size of the resource allocation field a smaller number of code word sizes needs to be monitored by the UE. This leads to a smaller number of blind decodings performed in the UE. The present invention enables a more tailored approach when determining the size of the resource allocation field to avoid too high overhead but also a too coarse resource allocation.

Control information assigning method

Abstract: The invention relates to a method and arrangement for transmitting and receiving control information in a radio-access network. A network node (100)transmits first control information in a first part (300) and second control information in a second part (302)of a time-frequency region (305) that is transmitted after a control region (200) in a subframe (310). The second part (302) is located later in the subframe (310) than the first part 300. The second control information may be less time-critical than the first control information. An intermediate node (103) receives and decodes the first control information at the end (320) of the first part. When the first control information indicates that the subframe (310) comprises data payload to the intermediate node(103), the intermediate node (103) receives and decodes the data payload. The intermediate node (103) receives second control information at the end(330) of the second part.

Discontinuous transmission scheme

Abstract: A base station transmits signals on a frequency (f1) in an active transmission interval (TI) having a starting time and being part of a transmission cycle (TC) including other active transmission intervals for other frequencies (f0, f1, f2, f3) appearing in a predetermined discontinuous transmission scheme that specifies the relationship (D1, Az, A3) between the starting times of the active transmission intervals of the frequencies of the set. The mobile station scans the set of frequencies during a scanning cycle (SC) corresponding to the transmission cycle (TC) and determines the frequencies at which the base stations transmit. The start of each scanning is made at a point in time that is specified for the corresponding frequency by the discontinuous transmission scheme and the scanning of one frequency involves ending scanning of this frequency at the end of a time range (TR) of pre-determined length if no signal is detected within this time range.

Dynamic wireless communication resource allocation

Abstract: FIELD: physics; radio. ^ SUBSTANCE: invention relates to allocation of wireless communication resources for communication between a mobile station and base station. The available set of resources can contain wireless communication resources, initially allocated to a neighbouring cell, if a mobile station is subject to effect of instantaneous (brief) low level in-channel interference from such neighbouring cells. Existence of interference is preferably logically taken out from signal quality measurements of pilot signals. Allocation may relate to communication on an uplink and/or downlink. Measuring devices are placed in the mobile station and devices for determining, selecting and actual allocation can be placed in other parts of the communication system, for example in the mobile station, in the base station or in the main network node, or as means of allocation. ^ EFFECT: possibility of using resources which are under the effect of adaptation of a schedule for repeated use of the same radio-frequency spectrum between different cells, as well as possibility of updating information on configuration of the system in the presence of said adaptation. ^ 18 cl, 10 dwg

Method for distribution of radio resources

Abstract: FIELD: information technologies. ^ SUBSTANCE: communication system comprises at least one control component of radio network and one or more components of basic station arranged with the possibility to realise scheme of upperlink planning relative to one or more subscriber terminals. Version of method realisation includes stages, at which at least one parametre of noise control is received with the help of one of basic station components at least from one control component of radio network, one or more presentations of planning are generated, taking into account at least one parametre of noise control, and one or more presentations of planning are issued for one or more subscriber terminals. ^ EFFECT: distribution of radio resources. ^ 22 cl, 11 dwg

Method, system and device to provide a continous wireless connection using a mobile station as relay

Abstract: A system and a method for wireless linking in a cellular communication system are disclosed such that a mobile station is maintained in simultaneous communication with at least a first node and a second node for access to the cellular communication system. Information going to and from the first node is not identical to the information going to and from the second node. In one embodiment the second node, or secondary access point is a relay node forwarding received information to and from the first node, or primary access point. In another embodiment the second node is another mobile station performing a direct mobile-to-mobile communication (MS-to-MS). In still an embodiment a first wireless link to the first node is for control information only. In still a further embodiment a second wireless link to the second node is only for communication of information from the mobile station or only for communication of information to the mobile station.