US 10,833,831 B2Granted

Controlling UE behavior for CSI/SRS reporting during DRX

AssigneeSun Patent Trust

InventorsJoachim Loehr, Hidetoshi Suzuki, Prateek Basu Mallick

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Abstract

The invention relates to a method for transmitting a periodic channel quality report (CSI) and/or a sounding reference symbol (SRS) from a UE to an eNodeB. To avoid double decoding at the eNodeB in transient phases, a deterministic behavior of the UE is defined by the invention, according to which the eNodeB can unambiguously determine whether the UE will transmit the CSI/SRS or not. According to one embodiment, the UL grants and/or DL assignments received until and including subframe N−4 only are considered; UL grants and/or DL assignments received by the UE after subframe N−4 are discarded for the determination. Additionally, DRX-related timers at subframe N−4 are considered for the determination. In a second embodiment, DRX MAC control elements from the eNodeB, instructing the UE to enter DRX, i.e., become Non-Active, are only considered for the determination if they are received before subframe N−4, i.e., until and including subframe N−(4+k).

Claims16

Dependent claims

A communication system comprising:

a user equipment including:
a receiver, which, in operation, receives, from a base station, configuration information for transmitting, in subframe N in an uplink to the base station, at least one of a channel quality information report and a sounding reference symbol, and receives, from the base station, a media access control (MAC) control element regarding a discontinuous reception (DRX) operation;
circuitry, which, in operation, determines whether the user equipment will be in DRX Active Time or DRX Non-Active Time in subframe N based at least on the MAC control element received until and including subframe N−(4+k), where k is an integer value equal to or greater than 1;
and
a transmitter, which, in operation, does not transmit the channel quality information report or the sounding reference symbol to the base station in subframe N, in case the user equipment is determined to be not in DRX Active Time in subframe N, and
the base station including:
a transmitter, which, in operation, transmits the configuration information and the MAC to the user equipment;
and
a receiver, which, in operation, does not receive the channel quality information report or the sounding reference signal from the user equipment in subframe N, in case the user equipment is determined to be not in DRX Active Time in subframe N.

6 more elements

A method performed by a communication system which contains a user equipment and a base station, the method comprising:

the base station transmitting, to the user equipment, configuration information for use by the user equipment to transmit, in subframe N in an uplink to the base station, at least one of a channel quality information report and a sounding reference signal;
the base station transmitting, to the user equipment, a media access control (MAC) control element regarding a discontinuous reception (DRX) operation;
the user equipment receiving, from the base station, the configuration information;
the user equipment receiving, from the base station, the MAC control element;
the user equipment determining whether the user equipment will be in DRX Active Time or DRX Non-Active Time in subframe N based at least on the MAC control element received until and including subframe N−(4+k), where k is an integer value equal to or greater than 1;
the user equipment determining not to transmit the channel quality information report or the sounding reference symbol to the base station in subframe N, in case the user equipment is determined to be not in DRX Active Time in subframe N;
and
the base station not receiving the channel quality information report or the sounding reference signal from the user equipment in subframe N, in case the user equipment is determined to be not in DRX Active Time in subframe N.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/674,873Filed 5 Nov 2019 · continuation
Priority: EP 1316019920 Mar 2013
Published: US 2020/0076562 A15 Mar 2020
Granted: 10 Nov 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

H04L 5/0057
Allocation of signalling, i.e. of overhead other than pilot signals: physical resource allocation for CQI
H04L 5/0051
Allocation of pilot signals, i.e. of signals known to the receiver: of dedicated pilots, i.e. pilots destined for a single user or terminal
H04W 72/0446
Based on the type of the allocated resource: resources in time domain, e.g. slots or frames
H04W 72/21
Control channels or signalling for resource management: in the uplink direction of a wireless link, i.e. towards the network

Family

PCT/EP2013/075499Parent of this continuation · filed 4 Dec 2013
Application15/594,424Parent of this continuation · filed 12 May 2017
US 9,686,067 B2Parent of this continuation · filed 20 Jun 2017
Application15/798,127Parent of this continuation · filed 30 Oct 2017
US 9,838,187 B2Parent of this continuation · filed 5 Dec 2017
Application15/957,821Parent of this continuation · filed 19 Apr 2018
US 9,979,529 B2Parent of this continuation · filed 22 May 2018
Application16/387,252Parent of this continuation · filed 17 Apr 2019
US 10,313,085 B2Parent of this continuation · filed 4 Jun 2019
US 2020/0076562 A1Pre-grant publication · published 5 Mar 2020
US 10,516,520 B2Parent of this continuation
Application14/777,721Parent of this continuation
US 2016/0294531 A1Published application
US 2017/0257205 A1Published application
US 2018/0048452 A1Published application
US 2018/0241533 A1Published application
US 2019/0245671 A1Published application
US 10,833,831 B2This patent

From the US filing history. Foreign family members aren’t listed.