Abstract: The embodiments disclose a method and BS to utilize a new Special Sub-Frame (SSF) in a legacy Time Division Duplex (TDD) cellular network, the BS is enabled to support the new SSF, the method notifies one or more User Equipments (UEs) served by the BS of a legacy SSF configuration, which actually is the corresponding new SSF configuration; schedules a downlink transmission including the new SSF from the BS to at least one of the one or more UEs respectively and performing the scheduled downlink transmission to the respective UE; and when receiving a response in a uplink transmission from the UE in response to the scheduled downlink transmission, determines that the UE is enabled to support the new SSF and thus communicating with the UE by means of the new SSF.

Abstract: A radio base station and a method therein are provided for allocating measurement gaps within a MGRP to UEs currently being served by the base station, wherein consideration is taken to the impact a measurement gap has on the HARQ processes. A plurality of possible measurement gaps are identified within the MGRP with regards to their starting point and duration in time within the MGRP. A number of HARQ processes that would be affected due to the identified measurement gaps with regards to a starting point in time of the identified measurement gaps during the MGRP are determined for the identified measurement gaps. The identified measurement gaps are ranked depending on the number of HARQ processes which would be affected during the MGRP and the identified measurement gaps are allocated to the UEs based on the ranking.

Abstract: A method executed in a first radio base station located in a first cell is provided for acquiring scheduling information associated with a second radio base station located in a neighboring cell, where the method comprises listening, via an air interface, to scheduling information transmitted, via a downlink control channel, from the second radio base station; decoding the received scheduling information, and providing the decoded scheduling information to an uplink receiver and/or uplink scheduler associated with the radio base station, such that the uplink receiver and/or uplink scheduler will be able to enhance its performance on the basis of the received scheduling information. An arrangement for executing the suggested method is also provided.

Abstract: The embodiments disclose a method and an Access Point (AP) for assigning a sounding resource in a Time Division Duplex (TDD) cellular network. The method obtains a channel information between a serving AP and a User Equipment (UE) served by the serving AP, determines whether to assign the sounding resource to the UE according to the predetermined assigning criteria based on the channel information, and makes the sounding resource assignment if it is determined to assign the sounding resource to the UE.

Abstract: The present invention relates to a method for determining link adaptation parameters for a wireless device. The method is performed in a first radio network node of a wireless communication system. The first radio network node hosts a first cell serving the wireless device. The wireless device is interfered by a second cell. The method comprises predicting (410) a future position of the wireless device. The method also comprises estimating (420) a first radio channel quality value for the wireless device in the predicted future position, based on: pathloss values related to the wireless device in the predicted future position for the first and the second cell respectively; and a transmission power of the second cell. The method further comprises determining (430) link adaptation parameters for the scheduling of the wireless device in the future position using the estimated first radio channel quality value.

Abstract: In a transmission scheme for transmitting data over a connection connecting a transmitting Main Unit and a receiving Radio Unit of a cellular radio system, where the transmitted data corresponds to user-plane data in the form of digital baseband data for different antenna-carriers, the digital signal is transmitted over the connection, e.g. a fiber, before spreading and combining is provided. The power and weight factor is transmitted separately with a few additional bits. Hereby, the Digital signal before spreading and combining is transmitted in the fiber instead of the combined multi-code signal.

Abstract: The invention discloses an adaptive phase shift method in a multi-carrier system, comprising: generating a group of one or more new phase values for corresponding one or more phase shift carriers, PSCs, based on quantization phase values; calculating and comparing a backward maximum power in an evaluation path with the group of one or more new phase values in one timeslot and a forward maximum power in a working path with current phase values in the timeslot; and adjusting phase of the PSCs based on the group of one or more new phase values if the calculated backward maximum power is less than the calculated forward maximum power. An adaptive phase shift apparatus is also disclosed. With the invention, complexity of the implementation is reduced and a small DPS block resource, low Hardware cost, low power consumption is also achieved.

Abstract: The embodiments disclosed relates to a method and a network node that estimates a signal power and/or noise power of a received reference signal. The receiving node may operate in a communications system applying frequency division multiplexing. An assumption is that the channel frequency responses, on adjacent subcarriers of the communications system are equivalent or constant. The method comprising receiving a reference signal comprising a first reference signal from a first wireless terminal and a second reference signal from a second wireless terminal By using this assumption it is possible to combine first and second reference signal in order to estimating the signal power and/or noise power of a received reference signal without a conventional channel estimation technique.

Abstract: A method and a base station for phase compensation in beamforming in a multi-antenna Time Division Duplex (TDD) communication network. In a first transmission mode, the base station estimates a first phase shift between a first antenna port and a reference antenna port in uplink based on a measurement of a first Sounding Reference Signal (SRS). Then the base station estimates in the first transmission mode a second phase shift between the first antenna port and the reference antenna port in downlink based on a Channel State Information (CSI) feedback from a User Equipment (UE), and calculates a parameter indicative of a difference between the first phase shift and the second phase shift.

Abstract: The present invention relates to a method for determining link adaptation parameters for a wireless device. The method is performed in a first radio network node of a wireless communication system. The first radio network node hosts a first cell serving the wireless device. The wireless device is interfered by a second cell. The method comprises predicting (410) a future position of the wireless device. The method also comprises estimating (420) a first radio channel quality value for the wireless device in the predicted future position, based on: pathloss values related to the wireless device in the predicted future position for the first and the second cell respectively; and a transmission power of the second cell. The method further comprises determining (430) link adaptation parameters for the scheduling of the wireless device in the future position using the estimated first radio channel quality value.

Abstract: A method of and a network controller (304) for recognizing an out-of-sync BS in a TDD based cellular communication network is provided. The method comprises the steps of receiving information reported by one or more BSs having uplink interference from the out-of-sync BS (414), and locating the out-of-sync BS based on the information (416). A BS and an NMS for use with the above network controller (304) and a TDD based cellular communication network comprising at least the above network controller (304) and the above BS (306-1, 306-2, . . . , 306-n) are also provided.

Abstract: A radio base station and a method therein are provided for allocating measurement gaps within a MGRP to UEs currently being served by the base station, wherein consideration is taken to the impact a measurement gap has on the HARQ processes. A plurality of possible measurement gaps are identified within the MGRP with regards to their starting point and duration in time within the MGRP. A number of HARQ processes that would be affected due to the identified measurement gaps with regards to a starting point in time of the identified measurement gaps during the MGRP are determined for the identified measurement gaps. The identified measurement gaps are ranked depending on the number of HARQ processes which would be affected during the MGRP and the identified measurement gaps are allocated to the UEs based on the ranking.

Abstract: A base station (14) in a mobile communication system operating according to a synchronised time division scheme comprises an antenna (26), a radio communication unit (24) for communicating with mobile stations of the system and an interference investigating unit (28) comprising a link quality measuring element (30), which obtains link quality measurements that are measured in the base station during uplink communication (UL) between at least one mobile station and the base station, a link quality evaluation element (32) that compares link quality measurements of at least one uplink channel with a link quality threshold and determines that the uplink channel is interfered by another base station if the link quality threshold is exceeded, a base station identifying element (34) that identifies the other base station via signals broadcast by the other base station and an interference limiting element (36) configured to perform an interference limitation activity based on the identification.

Abstract: The invention relates to Coordinated Scheduling for a Time Division Duplex (TDD) network. In a method for User Equipment (UE) scheduling by a base station in a TDD network, the base station receives scheduling decision from at least one neighboring cell of the base station, and schedules a UE among a plurality of UEs in the serving cell of the base station based on the scheduling decision from the at least one neighboring cell and based on smart antenna information. The inter-cell interference is suppressed and therefore the network performance is improved.

Abstract: The invention discloses a timing synchronization method in a User Equipment (UE) which is served in a first cell of a first synchronous communication network and also located in a second cell of a second synchronous communication network. The method comprises receiving a message from a communication node of the first network, the message including clock offsets of the first cell and the second cell or timing difference there between, and calculating downlink synchronization of the second cell from downlink synchronization of the first cell and the clock offsets/timing difference.

Abstract: The invention discloses a method (600) for use in a wireless communications system (100) in which there is at least one node (110-115) which controls the traffic to and from all user terminals (130) in a cell (120) within the system. In the system (100), use is made of the TDD principle for communication between said controlling node (110-115) and its user terminals (130), and according to the method (600), the controlling node transmits (610) a beacon signal for use as a signal quality indicator by the user terminals, said beacon signal being transmitted in a first TDD time slot (232). The user terminals (130) measure (620) the signal quality of the beacon signal and the signal quality in at least a second TDD time slot (234), and report (630) measurements of the signal qualities in both said first and second time slots to the controlling node.

Abstract: A method (400) for use in a wireless communications system (100) with a first transceiver (110) and a second transceiver (130) which communicate with each other, which system is a TDD-system, with communication divided into time frames with time slots. According to the method, the first transceiver transmits (410) a dedicated signal for use as a communications quality indicator by the second transceiver, and the second transceiver reports (420) measurements of the dedicated signal to the first transceiver. The dedicated signal is by the first transceiver in one or more TDD time slots, and the second transceiver measures (430) the individual signal strength of the dedicated signal in at least a first and a second time slot and transmits (440) measurement reports to the first transceiver based on the individual measurements in the first and second time slots of the dedicated signal.

Abstract: In a transmission scheme for transmitting data over a connection connecting a transmitting Main Unit and a receiving Radio Unit of a cellular radio system, where the transmitted data corresponds to user-plane data in the form of digital baseband data for different antenna-carriers, the digital signal is transmitted over the connection, e.g. a fiber, before spreading and combining is provided. The power and weight factor is transmitted separately with a few additional bits. Hereby, the Digital signal before spreading and combining is transmitted in the fiber instead of the combined multi-code signal.

Abstract: A method of and a network controller (304) for recognizing an out-of-sync BS in a TDD based cellular communication network is provided. The method comprises the steps of receiving information reported by one or more BSs having uplink interference from the out-of-sync BS (414), and locating the out-of-sync BS based on the information (416). A BS and an NMS for use with the above network controller (304) and a TDD based cellular communication network comprising at least the above network controller (304) and the above BS (306-1, 306-2, . . . , 306-n) are also provided.

Abstract: The invention discloses a method (600) for use in a wireless communications system (100) in which there is at least one node (110-115) which controls the traffic to and from all user terminals (130) in a cell (120) within the system. In the system (100), use is made of the TDD principle for communication between said controlling node (110-115) and its user terminals (130), and according to the method (600), the controlling node transmits (610) a beacon signal for use as a signal quality indicator by the user terminals, said beacon signal being transmitted in a first TDD time slot (232). The user terminals (130) measure (620) the signal quality of the beacon signal and the signal quality in at least a second TDD time slot (234), and report (630) measurements of the signal qualities in both said first and second time slots to the controlling node.