Systems and methods for delay based power ramping of devices

Patent metadata

Field	Value
Publication number	US-10462825-B2
Application number	US-201715792034-A
Country	US
Kind code	B2
Filing date	Oct 24, 2017
Priority date	Mar 6, 2017
Publication date	Oct 29, 2019
Grant date	Oct 29, 2019

Abstract

In LTE Random Access Channel (RACH) mechanism, devices use slotted ALOHA based protocol for RACH message exchange. During these messages exchange, if a device does not get a response from a base-station (BS), the device assumes that it is not able to reach base station due to insufficient transmission power and increases transmit power to reach to the base station. However, at higher density most of requests are lost due to collision. In existing RACH procedure, device unnecessarily ramps power in next RACH process which leads to power wastage in already resource constrained device. When there is failure of reception of RACH process, the present disclosure computes time delays (TD) based on a RSSI value obtained from a message transmitted by the BS, and initiates RACH process accordingly. The embodiments further enable requests transmission from device to BS by ramping power of the devices based on the computed TD.

First claim

What is claimed is:

1. A method, comprising:
transmitting, by one or more IoT (Internet of Things) devices, a request to a base station, the request comprising a preamble for accessing one or more resources of the base station;
upon reception of a message including a received signal strength indicator (RSSI) value for configuring power of the one or more IoT devices to a first power level from the base station specific to the request, initiating at a first time interval, over a first Random-access channel (RACH) transmission channel by the one or more IoT devices, a first Random-access channel (RACH) process based on the RSSI value extracted from the message by configuring power of the one or more IoT devices to the first power level;
upon failure of the first RACH process:
computing, by the one or more IoT devices, one or more time delays specific to power ramping of the one or more IoT devices;
initiating, at a second time interval, a second RACH process for the one or more IoT devices based on the one or more computed time delays; and
upon initiating the second RACH process, ramping power of the one or more IoT devices to one or more power levels based on the one or more computed time delays and independent from number of RACH process transmission, wherein the one or more time delays are computed based on the extracted RSSI value associated with the one or more IoT devices.

2. The method of claim 1 , wherein the ramping, during the second RACH process, the power of the one or more IoT devices to the one or more power levels based on the one or more computed time delays comprises:
configuring the one or more IoT devices to a second power level based on the one or more computed time delays, wherein a request to the base station is transmitted over a second RACH transmission channel based on the second power level.

3. The method of claim 1 , further comprising:
segregating the one or more IoT devices into one or more groups based on the extracted RSSI value associated with the one or more IoT devices; and
mapping each of the one or more IoT devices to one or more RACH transmission slots.

4. The method of claim 3 , wherein each of the one or more IoT devices are power ramped based on the one or more mapped RACH transmission slots.

5. A IoT device comprising:
a memory storing instructions;
one or more communication interfaces; and
one or more hardware processors coupled to the memory using the one or more communication interfaces, wherein the IoT device is configured by the instructions the one or more hardware processors to:
transmit a request to a base station, the request comprising a preamble for accessing one or more resources of the base station;
upon reception of a message including a received signal strength indicator (RSSI) value for configuring power of the IoT device to a first power level from the base station specific to the request, initiate at a first time interval, over a first Random-access channel (RACH) transmission channel by the IoT device, a first Random-access channel (RACH) process based on the RSSI value extracted from the message by configuring power of the IoT devices to the first power level;
upon failure of the first RACH process:
compute one or more time delays specific to power ramping of the IoT device;
initiate, at a second time interval, a second RACH process for the IoT device based on the one or more computed time delays; and
upon initiating the second RACH process, ramp power of the IoT device to one or more power levels based on the one or more computed time delays and independent from number of RACH process transmission, wherein the one or more time delays are computed based on the extracted RSSI value associated with the one or more IoT devices.

6. The IoT device of claim 5 , wherein the power of the IoT device is ramped to one or more power levels based on the one or more computed time delays by configuring the IoT device to a second power level based on the one or more computed time delays, and wherein based on the second power level, a request from the IoT device is transmitted to the base station over a second RACH transmission channel.

7. The IoT device of claim 5 , wherein the IoT device is segregated into a group based on the extracted RSSI value associated thereof, and further mapped to one or more RACH transmission slots.

8. The device of claim 7 , wherein the IoT device is power ramped based on the one or more mapped RACH transmission slots.

9. One or more non-transitory machine readable information storage mediums comprising one or more instructions which when executed by one or more IoT devices causes a method for delay based power ramping of IoT devices, the method comprising:
transmitting, by the one or more IoT devices, a request to a base station, the request comprising a preamble for accessing one or more resources of the base station;
upon reception of a message including a received signal strength indicator (RSSI) value for configuring power of the one or more IoT devices to a first power level from the base station specific to the request, initiating at a first time interval, over a first Random-access channel (RACH) transmission channel by the one or more IoT devices, a first Random-access channel (RACH) process based on the RSSI value extracted from the message by configuring power of the one or more IoT devices to the first power level;
upon failure of the first RACH process:
computing, by the one or more IoT devices, one or more time delays specific to power ramping of the one or more IoT devices;
initiating, at a second time interval, a second RACH process for the one or more IoT devices based on the one or more computed time delays; and
upon initiating the second RACH process, ramping power of the one or more IoT devices to one or more power levels based on the one or more computed time delays and independent from number of RACH process transmission, wherein the one or more time delays are computed based on the extracted RSSI value associated with the one or more IoT devices.

10. The one or more non-transitory machine readable information storage mediums of claim 9 , wherein the step of ramping, during the second RACH process, the power of the one or more IoT devices to the one or more power levels based on the one or more computed time delays comprises:
configuring the one or more IoT devices to a second power level based on the one or more computed time delays, wherein a request to the base station is transmitted over a second RACH transmission channel based on the second power level.

11. The one or more non-transitory machine readable information storage mediums of claim 9 , wherein the instructions further comprise:
segregating the one or more IoT devices into one or more groups based on the extracted RSSI value associated with the one or more IoT devices; and
mapping each of the one or more IoT devices to one or more RACH transmission slots, wherein each of the one or more IoT devices are power ramped based on the one or more mapped RACH transmission slots.

Assignees

• Tata Consultancy Services Ltd

Inventors

• Shailendra Samar
• Kabbinale Aniruddh Rao
• Panigrahi Bighnaraj
• Rath Hemant Kumar
• Simha Anantha

Classifications

• H04W74/0833 Primary

  Random access procedures, e.g. with 4-step access · CPC title

• H04W72/0446

  Resources in time domain, e.g. slots or frames · CPC title

• H04W52/32

  TPC of broadcast or control channels · CPC title

• H04W88/08

  Access point devices · CPC title

• H04W52/50

  at the moment of starting communication in a multiple access environment · CPC title