Telefonaktiebolaget Lm Ericsson (publ)

Claes-Göran Persson

Paul Schliwa-Bertling

John Walter Diachina

Johan Rune

Nicklas Johansson

Pontus Wallentin

Jens Bergqvist

Anders Molander

Oscar Ohlsson

Björn Hofström

Pradeepa Ramachandra

Andreas Bergström

Angelo Centonza

Stefan Engström

Philip Hodges

Dan Antonsson

Robert Baldemair

Andres Reial

Olof Liberg

Jianwei Zhang

Sajal Kumar Das

Thomas Johansson

Ravitej Ballakur

Julien Muller

Paul Schliwa-Bergling

Henry Freberg

Stefan ENGSTRÖM

Sarvesh Rao Badanidiyur

Pail Schliwa-Bertling

A method performed by a source access node for performing data forwarding at handover of a UE from a source cell to a target cell in a wireless communications network is provided. When a criterion for data forwarding is fulfilled, the source access node obtains a trigger for downlink data forwarding. When receiving the trigger, the source access node initiates downlink data forwarding to the UE via the target access node.

Access node, user equipment and methods in a wireless communications network

Embodiments herein relate to for example a method performed by a radio network node for handling a communication of a user equipment, UE, in a wireless communication network. The radio network node transmits a handover command for handing over the UE, from a source cell to a target cell, wherein a security parameter for encrypting data communicated between the radio network node and the UE is retained during the handover. Furthermore, the radio network node maintains a sequence number status for reception and/or transmission of a signalling radio bearer of the UE during the handover from the source cell to the target cell, and/or at a fallback from the target cell to the source cell, when the UE triggers the fallback to the source cell.

Radio network node, user equipment (UE) and methods performed therein

According to some embodiments, methods are provided to operate a base station of a wireless communication network. For example, parameters may be generated that define a plurality of potential PDCCH monitoring occasions and that define a plurality of paging occasions, wherein each one of the plurality of paging occasions includes a respective subset of the plurality of potential PDCCH monitoring occasions, wherein consecutive paging occasions are spaced apart in time with at least one of the potential PDCCH monitoring occasions therebetween not being included in any of the plurality of paging occasions. The parameters are transmitted over a radio interface to a wireless device. Related methods of operating wireless devices, related base stations, and related wireless devices are also discussed.

Provision of distributed paging occasions

The present disclosure relates to telecommunications. In one of its aspects, the disclosure concerns a method performed by a User Equipment for handling Packet Data Convergence Protocol (PDCP) Service Data Units (SDUs) when performing a Dual Active Protocol Stack (DAPS) handover of at least one radio bearer from a source access node to a target access node in a wireless communications network. The method comprises obtaining a trigger to perform the handover and establishing a radio connection for the at least one radio bearer with the target access node. An uplink transmission of PDCP SDUs is switched from the source to the target access node over the established radio connection. A radio connection with the source access node is released and a PDCP status report is transmitted to the target access node for each configured radio bearer. The respective PDCP status report indicates PDCP Sequence Numbers (SNs) of missing PDCP SDUs.

User equipment, target access node and methods in a wireless communications network for handling packet data convergence protocol (PDCP) service data units (SDU) when performing a dual active protocol stack (DAPS) handover

A method performed by a User Equipment, UE, to perform handover from a source access node to a target access node is provided. The UE, the source access node andthe target access node are operating in a wireless communications network. The UE receives () a handover command message from the source access node. The UE establishes () a target radio connection with the target access node, and determines () whether or not a source cell release criterion is fulfilled. When the source cell release criterion is determined to be fulfilled, the UE releases () a source radioconnection with the source access node.

User equipment and methods therein for performing handover

After receiving a handover command () that commands a wireless device () to perform a make-before-break handover (), the wireless device () continues to receive from a source link (-) downlink data packets for an unacknowledged mode bearer (), until after the wireless device () establishes a connection with the target link (-) as part of the handover. After the wireless device () establishes the connection with the target link (-), the wireless device () receives from the target link (-) downlink data packets for the unacknowledged mode bearer (). The wireless device () preserves a downlink data packet sequence number receiver status for the unacknowledged mode bearer (), by using the same downlink data packet sequence number receiver status for the unacknowledged mode bearer () before and after the handover. Based on the downlink data packet sequence number receiver status as preserved, the wireless device () monitors for data packets received in duplicate from the source link (-) and the target link (-) for the unacknowledged mode bearer ().

Handover of unacknowledged mode bearer in a wireless communication system

Embodiments herein relate to, e.g., a method performed by a source access node relating to handover of a UE. The source access node sends to a target access node, an initial handover preparation message with a first explicit indicator for the target access node to request an enhanced Make-Before-Break Handover. The source access node receives an handover preparation response message from the target access node, with a second explicit indicator accepting or rejecting the requested enhanced Make-Before-Break Handover. Further, the source access node selects a possible fallback mechanism, upon reception of the handover preparation response message from the target access node indicating rejection or no support of enhanced Make-Before-Break Handover.

Source access node, target access node and methods for enhanced handover

A method performed by a target access node for handling data packets in a handover of a User Equipment, UE, from a source cell served by a source access node, to a target cell, served by the target access node in a wireless communications network is provided. The target access node receives a status report of last received data packet in the UE from the source access node. The target access node performs a data packet duplication check based on the information comprised in the status report. The target access node then sends to the UE, only data packets which have not already been received by the UE from the source access node, based on the outcome of the duplication check.

User equipment, source access node, target access node, and methods in a wireless communications network for handling data packets in a handover

According to an aspect, a network node operating in a first RAN according to a first RAT is the target of an inter-RAT (IRAT) handover. The network node receives a handover request for a user equipment from a cell in a second RAN operating according to a second RAT. After handover of the user equipment to a cell in the first RAN is completed, the network node configures the user equipment to measure one or more frequencies corresponding to the second RAN. Based on measurements reported by the user equipment for the one or more frequencies, the network node identifies one or more detected cells exceeding a measurement threshold, and sends a handover report towards the second RAN. The handover report includes, for at least one detected cell exceeding the measurement threshold, a physical cell identifier for the detected cell and a frequency identifier for the detected cell.

Optimized detection of unnecessary inter-RAT handover

According to some embodiments, a method performed by a wireless device comprises receiving first paging information in a downlink control information (DCI) of a physical downlink control channel (PDCCH). The wireless device is uniquely identified by a full identifier of length L bits and the first paging information in the DCI comprises one or more short identifiers of length K bits, where K is less than L. The method further comprises determining whether one of the one or more short identifiers matches a portion of the full identifier of the wireless device. Upon determining one of the one or more short identifiers matches a portion of the full identifier of the wireless device, the method further comprises decoding second paging information in a physical downlink shared channel (PDSCH) associated with the DCI and determining the second paging information includes paging information targeted for the wireless device.

Paging optimization using truncated UE identifiers

A method, system and apparatus are disclosed. In one example, a network node configured for performing dual beam sweep, the dual beam sweep including a physical downlink control channel (PDCCH) beam sweep and a corresponding physical downlink shared channel (PDSCH) beam sweep that are separated in time to each other. The network node is configured to, and/or including a radio interface and/or including processing circuitry configured to: configured to: indicate, in a PDCCH transmission within the PDCCH beam sweep, a time domain resource allocation for the corresponding PDSCH beam, the time domain resource allocation corresponding to an offset in time slots between the PDCCH beam and the corresponding PDSCH beam, the offset being one of a plurality of offsets that can be indicated for the corresponding PDSCH beam; and perform the dual beam sweep using at least in part the indication.

Resource allocation for beam sweep

According to some embodiments, a method performed by a wireless device for receiving paging information comprises receiving a paging message from a network node. The paging message includes a paging indicator associated with a plurality of wireless devices (e.g., group paging message). The method further comprises determining the wireless device is associated with the paging indicator, transmitting a random access request message to the network node, and receiving a random access response message from the network node. The random access response message is associated with a radio network temporary identifier (RNTI). The method further comprises determining, based on the RNTI, that the random access response includes additional paging information for the wireless device, and decoding the random access response.

Dedicated RNTI(s) for response-driven paging

According to a first aspect of embodiments herein, the object is achieved by a method performed by a User Equipment, UE, for handling a paging message in a wireless communications network. The UE configures () the UE to derive a group paging identifier to be associated with the UE from a first identifier associated with the UE, and to use the derived group paging identifier for identifying group paging identifier matches in response-driven paging, irrespective of UE state and initiator of the paging. The UE receives () a paging message from the wireless communications network. The paging message comprises the group paging identifier associated with the UE. The UE then derives () the group paging identifier associated with the UE from the first identifier associated with the UE. By means of the derived group paging identifier the UE identifies () group paging identifier matches in response-driven paging, irrespective of said UE states and initiator of the paging.

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Mjölby, Sweden

Claes-Göran Persson