# US 11,115,994 B2 · Triggering/initiating backoff procedure(s) based on congestion indication(s) to defer scheduling request transmission

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- Number: US 11,115,994 B2
- Document ID: US11115994B2
- Status: Granted
- Kind: B2
- Application number: 16/075,273
- Filed: 2016-02-17
- Published: 2019-02-07
- Granted: 2021-09-07
- Earliest claimed: 2016-02-17
- Assignees: Telefonaktiebolaget LM Ericsson (publ)
- Applicants: Telefonaktiebolaget LM Ericsson (publ)
- Inventors: Jonas Pettersson
- Web page: https://patentgrep.com/patent/US11115994B2

## CPC

- H04W 72/52: based on load
- H04W 28/0278: {using buffer status reports (dynamic wireless traffic scheduling definition H04W72/12)}
- H04W 28/0284: {detecting congestion or overload during communication (monitoring arrangements H04L43/00)}
- H04W 48/06: based on traffic conditions
- H04W 48/12: using downlink control channel
- H04W 56/001: {Synchronization between nodes}
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04W 72/566: of the information or information source or recipient
- H04W 72/569: {of the traffic information}
- H04W 74/02: Hybrid access
- H04W 74/0816: with collision avoidance
- H04W 74/0833: Random access procedures, e.g. with 4-step access
- H04W 74/0891: {for synchronized access}
- H04L 47/24: Traffic characterised by specific attributes, e.g. priority or QoS
- H04L 47/28: in relation to timing considerations
- H04W 80/02: Data link layer protocols
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

There is provided a method and corresponding device for transmitting a congestion indication to a group of wireless communication devices for synchronized triggering of backoff procedures in the wireless communication devices. A purpose of the synchronized triggering of the backoff procedures may be to enable deferring, in each of the wireless communication devices, transmission of scheduling request(s) until one or more backoff procedures in the considered wireless device is completed. In this way, the proposed technology provides efficient load control related to scheduling requests and/or enables a reduction of the average response time between scheduling request and grant.

## Claims

### Claim 1

A method for enabling load control related to scheduling requests for uplink grants in a wireless communication system, the method comprising:
transmitting a congestion indication to a group of wireless communication devices for synchronized triggering of backoff procedures that enables deferring, in each of the wireless communication devices, transmission of scheduling requests until one or more backoff procedures in the wireless communication devices are completed, wherein the synchronized triggering is achieved by simultaneously transmitting the congestion indication to the group of wireless communication devices; and
determining a priority level of an event triggered a scheduling request based on a time between a most recently transmitted congestion indication and reception of the scheduling request for determining when to grant access to a shared uplink channel;
wherein congestion indications are transmitted with a shorter length of a time interval between repeated transmissions of congestion indications when a level of congestion is higher compared to when the level of congestion is lower.

### Claim 2

A device configured to:
enable load control related to scheduling requests for uplink grants in a wireless communication system; and
transmit a congestion indication to a group of wireless communication devices for synchronized triggering of backoff procedures that enables deferring, in each of the wireless communication devices, transmission of scheduling requests until one or more backoff procedures in the wireless communication devices are completed, wherein the synchronized triggering is achieved by simultaneously transmitting the congestion indication to the group of wireless communication devices; and
determining a priority level of an event triggered a scheduling request based on a time between a most recently transmitted congestion indication and reception of the scheduling request for determining when to grant access to a shared uplink channel;
wherein the device is further configured to transmit congestion indications with a shorter length of a time interval between repeated congestion indications when a level of congestion is higher compared to when the level of congestion is lower.

### Claim 3 (depends on 1)

The method of claim 1, wherein repeated congestion indications are transmitted and wherein a length of a time interval between repeated transmissions of congestion indications is adapted according to a level of congestion.

### Claim 4 (depends on 2)

The device of claim 2, wherein the device is further configured to transmit repeated congestion indications and wherein a length of a time interval between repeated congestion indications is adapted according to a level of congestion.