# US 10,313,085 B2 · Controlling UE behavior for CSI/SRS reporting during DRX

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- Number: US 10,313,085 B2
- Document ID: US10313085B2
- Status: Granted
- Kind: B2
- Application number: 15/957,821
- Filed: 2018-04-19
- Published: 2018-08-23
- Granted: 2019-06-04
- Earliest claimed: 2013-03-20
- Assignees: Sun Patent Trust
- Applicants: Sun Patent Trust
- Inventors: Joachim Loehr; Hidetoshi Suzuki; Prateek Basu Mallick
- Web page: https://patentgrep.com/patent/US10313085B2

## CPC

- H04L 5/0057: {Physical resource allocation for CQI}
- H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal}
- H04W 72/0446: Resources in time domain, e.g. slots or frames
- H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04W 76/28: Discontinuous transmission [DTX]; Discontinuous reception [DRX]
- H04W 16/14: Spectrum sharing arrangements {between different networks}
- H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports}
- Y02D 30/70: in wireless communication networks
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE

## 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).

## Claims

### Claim 1

An integrated circuit to control a process of a mobile station, the process comprising:
receiving configuration information from a base station, wherein the configuration information is for transmitting at least one of a channel quality information report and a sounding reference signal to the base station in subframe N;
receiving a MAC control element relating to a DRX operation from the base station;
determining whether the mobile station will be in DRX Active Time or DRX Non-Active Time in subframe N, at least based on the MAC control element received until and including subframe N−(4+k), where k is an integer value greater than or equal to 1; and
determining not to transmit the channel quality information report or the sounding reference signal to the base station in subframe N, in case the mobile station is determined to be not in DRX Active Time in subframe N.

### Claim 2 (depends on 1)

The integrated circuit according to claim 1, wherein the process includes determining to periodically transmit the channel quality information report and/or the sounding reference signal, based on the received configuration information.

### Claim 3 (depends on 1)

The integrated circuit according to claim 1, wherein the step of determining whether the mobile station will be in DRX Active Time or DRX Non-Active Time in subframe N includes considering uplink resource grants for an uplink shared channel and/or downlink resource assignments for a downlink shared channel, received by the mobile station until and including subframe N−(4+k).

### Claim 4 (depends on 1)

The integrated circuit according to claim 1, wherein the process includes determining to transmit the channel quality information report and/or the sounding reference signal to the base station in subframe N, in case the mobile station is determined to be in DRX Active Time in subframe N.

### Claim 5 (depends on 1)

The integrated circuit according to claim 1, wherein the step of determining whether the mobile station will be in DRX Active Time or DRX Non-Active Time in subframe N includes considering DRX-related timers running for the mobile station, including at least one of a DRX Inactivity Timer, a DRX OnDuration Timer, and a DRX Retransmission Timer.

### Claim 6 (depends on 1)

The integrated circuit according to claim 1, wherein the process includes restricting periodic transmission of the channel quality information reports so that they are sent only during the DRX Active Time.

### Claim 7 (depends on 1)

The integrated circuit according to claim 1, wherein the process includes disregarding any MAC control elements relating to a DRX operation and destined for the mobile station in subframes N−(3+k) to N.

### Claim 8 (depends on 1)

The integrated circuit according to claim 1, wherein k is 1.

### Claim 9 (depends on 1)

The integrated circuit according to claim 1, comprising:
circuitry which, in operation, controls the process;
at least one input coupled to the circuitry, wherein the at least one input, in operation, inputs data; and
at least one output coupled to the circuitry, wherein the at least one output, in operation, outputs data.

### Claim 10

An integrated circuit to control operation of a mobile station, the integrated circuit comprising:
reception circuitry which, in operation, controls reception of configuration information from a base station, wherein the configuration information is for transmitting at least one of a channel quality information report and a sounding reference signal to the base station in subframe N, and controls reception of a MAC control element relating to a DRX operation from the base station;
control circuitry which, in operation, determines whether the mobile station will be in DRX Active Time or DRX Non-Active Time in subframe N, at least based on the MAC control element received until and including subframe N−(4+k), where k is an integer value greater than or equal to 1; and
transmission circuitry which, in operation, is controlled by the control circuitry not to transmit the channel quality information report or the sounding reference signal to the base station in subframe N, in case the mobile station is determined to be not in DRX Active Time in subframe N.

### Claim 11 (depends on 10)

The integrated circuit according to claim 10, wherein the transmission circuitry, in operation, controls periodic transmission of the channel quality information report and/or the sounding reference signal, based on the received configuration information.

### Claim 12 (depends on 10)

The integrated circuit according to claim 10, wherein the control circuitry, in operation, determines whether the mobile station will be in DRX Active Time or DRX Non-Active Time in subframe N, based on uplink resource grants for an uplink shared channel and/or downlink resource assignments for a downlink shared channel, received by the mobile station until and including subframe N−(4+k).

### Claim 13 (depends on 10)

The integrated circuit according to claim 10, wherein the transmission circuitry, in operation, controls transmission of the channel quality information report and/or the sounding reference signal to the base station in subframe N, in case the mobile station is determined to be in DRX Active Time in subframe N.

### Claim 14 (depends on 10)

The integrated circuit according to claim 10, wherein the control circuitry, in operation, determines whether the mobile station will be in DRX Active Time or DRX Non-Active Time in subframe N, based on DRX-related timers running for the mobile station, including at least one of a DRX Inactivity Timer, a DRX OnDuration Timer, and a DRX Retransmission Timer.

### Claim 15 (depends on 10)

The integrated circuit according to claim 10, wherein the transmission circuitry, in operation, restricts periodic transmission of the channel quality information reports so that they are sent only during the DRX Active Time.

### Claim 16 (depends on 10)

The integrated circuit according to claim 10, wherein the control circuitry, in operation, disregards any MAC control elements relating to a DRX operation and destined for the mobile station in subframes N−(3+k) to N.

### Claim 17 (depends on 10)

The integrated circuit according to claim 10, wherein k is 1.