SYSTEMS AND METHODS FOR DELAY BASED POWER RAMPING OF DEVICES

• US 20180255587A1
• Filed: 10/24/2017
• Published: 09/06/2018
• Est. Priority Date: 03/06/2017
• Status: Active Grant

• Current Assignee: TATA Consultancy Services Limited (Tata Sons Pvt Ltd.)
• Original Assignee: TATA Consultancy Services Limited (Tata Sons Pvt Ltd.)
• Inventors: Shailendra, Samar, Kabbinale, Aniruddh Rao, Panigrahi, Bighnaraj, Rath, Hemant Kumar, Simha, Anantha
• Granted Patent: US 10,462,825 B2
• Time in Patent Office: Days
• CPC Class Codes: H04W 52/32 TPC of broadcast or control channels
• CPC Class Codes: H04W 52/48 during retransmission after error or non-acknowledgment
• CPC Class Codes: H04W 52/50 at the moment of starting communication in a multiple access environment
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access
• CPC Class Codes: H04W 88/08 Access point devices

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.

Claims

1. A method, comprising:

transmitting, by one or more devices (100), 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 from the base station specific to the request, initiating at a first time interval, over a first RACH transmission channel by the one or more devices (100), a first Random-access channel (RACH) process based on a received signal strength indicator (RSSI) value extracted from the message by configuring power of the one or more devices to a first power level;

upon failure of the first RACH process;

computing, by the one or more devices (100), one or more time delays specific to power ramping of the one or more devices;

initiating, at a second time interval, a second RACH process for the one or more devices based on the one or more computed time delays; and

upon initiating the second RACH process, ramping power of the one or more devices (100) to one or more power levels based on the one or more computed time delays.

2. The processor implemented method of claim 1, wherein ramping, during the second RACH process, power of the one or more devices (100) to one or more power levels based on the one or more computed time delays comprises:

configuring the one or more devices (100) 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 processor implemented method of claim 1, wherein the one or more time delays are computed based on the extracted RSSI value associated with the one or more devices (100).

4. The processor implemented method of claim 1, further comprising

segregating the one or more devices (100) into one or more groups based on the extracted RSSI value associated with the one or more devices;

and

mapping each of the one or more devices (100) to one or more RACH transmission slots.

5. The processor implemented method of claim 4, wherein each of the one or more devices (100) are power ramped based on the one or more mapped RACH transmission slots.

6. A device (100) comprising:

a memory (102) storing instructions;

one or more communication interfaces (106); and

one or more hardware processors (104) coupled to the memory using the one or more communication interfaces, wherein the device is configured by the instructions the one or more hardware processors to;

transmit by 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 from the base station specific to the request, initiate at a first time interval, over a first RACH transmission channel by the device (100), a first Random-access channel (RACH) process based on a received signal strength indicator (RSSI) value extracted from the message by configuring power of the one or more devices to a first power level,

upon failure of the first RACH process;

compute one or more time delays specific to power ramping of the device (100),

initiate, at a second time interval, a second RACH process for the device (100) based on the one or more computed time delays, and

upon initiating the second RACH process, ramp power of the device (100) to one or more power levels based on the one or more computed time delays.

7. The device of claim 6, wherein power of the device (100) is ramped to one or more power levels based on the one or more computed time delays by configuring the device (100) 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 device (100) is transmitted to the base station over a second RACH transmission channel.

8. The device of claim 6, wherein the one or more time delays are computed based on the extracted RSSI value associated with the device (100).

9. The device of claim 6, wherein the device is segregated into a group based on the extracted RSSI value associated thereof, and further mapped to one or more RACH transmission slots.

10. The device of claim 9, wherein the device is power ramped based on the one or more mapped RACH transmission slots.

11. One or more non-transitory machine readable information storage mediums comprising one or more instructions which when executed by one or more devices causes a method for delay based power ramping of devices, the method comprising:

transmitting, by the one or more 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 from the base station specific to the request, initiating at a first time interval, over a first RACH transmission channel by the one or more devices, a first Random-access channel (RACH) process based on a received signal strength indicator (RSSI) value extracted from the message by configuring power of the one or more devices to a first power level;

upon failure of the first RACH process;

computing, by the one or more devices, one or more time delays specific to power ramping of the one or more devices;

initiating, at a second time interval, a second RACH process for the one or more devices based on the one or more computed time delays; and

upon initiating the second RACH process, ramping power of the one or more devices to one or more power levels based on the one or more computed time delays.

12. The one or more non-transitory machine readable information storage mediums of claim 11, wherein the step of ramping, during the second RACH process, power of the one or more devices to one or more power levels based on the one or more computed time delays comprises:

configuring the one or more 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.

13. The one or more non-transitory machine readable information storage mediums of claim 11, wherein the one or more time delays are computed based on the extracted RSSI value associated with the one or more devices.

14. The one or more non-transitory machine readable information storage mediums of claim 11, wherein the instructions further comprise:

segregating the one or more devices into one or more groups based on the extracted RSSI value associated with the one or more devices; and

mapping each of the one or more devices to one or more RACH transmission slots, wherein each of the one or more devices are power ramped based on the one or more mapped RACH transmission slots.