US 2017/0303171 A1 · HANDLING HANDOVER OF AN UE IN CASE CELL SPECIFIC REFERENCE SIGNALS INTERFER WITH A PHYSICAL DOWNLINK CONTROL CHANNEL

Abstract

A method performed by a network node, for handling handover of a user equipment (UE), wherein the network node serves a first cell comprising one or more UEs. When the network node has detected that a Signaling Radio Bearer (SRB) is determined to be scheduled for a UE in handover from the first cell to a second cell, the network node increases the number of OFDM-symbols included in a control region of a downlink OFDM-subframe sent in the first cell in a Transmission Time Interval (TTI) related to the handover. By increasing the number of OFDM-symbols of the control region only during the handover, the physical downlink control channel (PDCCH) is spread in time into symbols not polluted by CRS symbols from neighboring cells. Thereby the number of unsuccessful handovers and lost service is effectively reduced.

Claims11

Dependent claims

A method performed by a network node, for handling handover of a user equipment, (UE), wherein the network node serves a first cell including one or more UEs, the method comprising:

when a Signaling Radio Bearer (SRB) is determined to be scheduled for a UE in handover from the first cell to a second cell,
increasing a number of Orthogonal Frequency Division Multiplexing (OFDM)-symbols included in a control region of a downlink OFDM-subframe sent in the first cell, which subframe is sent in a Transmission Time Interval (TTI) related to the handover.

Dependencies are inferred from the claim text.

Facts

Application

15/516,889Filed 11 Nov 2014

Priority

21 Oct 2014

Published

19 Oct 2017

Term ends

Not estimatedThe source records don’t support an estimate.

Classification13 codes

H04L 5/0053
Arrangements for allocating sub-channels of the transmission path: allocation of signalling, i.e. of overhead other than pilot signals
H04L 5/0005
Two-dimensional division: time-frequency
H04L 5/005
Allocation of pilot signals, i.e. of signals known to the receiver: of common pilots, i.e. pilots destined for multiple users or terminals
H04L 5/0055
Allocation of signalling, i.e. of overhead other than pilot signals: physical resource allocation for ACK/NACK

Handling handover of an ue in case cell specific reference signals interfer with a physical downlink control channel

Life of this patent

Handling handover of an ue in case cell specific reference signals interfer with a physical downlink control channel

Life of this patent

Abstract

Claims11