A method and system for selecting an optimal drx configuration

Patent metadata

Field	Value
Publication number	US-2016234780-A1
Application number	US-201415029620-A
Country	US
Kind code	A1
Filing date	Oct 7, 2014
Priority date	Oct 14, 2013
Publication date	Aug 11, 2016
Grant date	—

Abstract

A method and system for selecting an optimal DRX configuration for a User Equipment (UE) in a communication network is provided. An expression for expected maximum delay experienced by a packet arriving during the off-duration is derived for any packet arrival process (either known arrival process or unknown arrival process). Further, the method for computing the active duration in any DRX cycle with the expected delay to be less than a given threshold by considering all the timers in the communication network is provided. The DRX cycle configuration with minimum active duration is selected as optimal DRX configuration by the UE and UE informs the optimal DRX configuration to the network.

First claim

1 . A method for selecting an optimal discontinuous reception (DRX) configuration for a user equipment (UE) in a communication network, wherein said method comprises:
characterizing packet delay as a function of DRX cycle duration and a random variable by said UE, wherein said random variable indicates inter-arrival time between packets; determining expected delay for a plurality of packets based on at least one said random variable; evaluating on-duration of said DRX configuration for which said determined expected delay is less than minimum of delay constraints of at least one application running in background of said UE; and computing active time of said DRX configuration based on said evaluated on-duration and selecting said optimal DRX configuration with minimum active time by said UE.

2 . The method as in claim 1 , wherein said method further comprises communicating said selected optimal DRX configuration to a radio access network (RAN) by said UE.

3 . The method as in claim 1 , wherein said active time of said DRX configuration is computed by considering the effect of at least one timer of said communication network, wherein said timer comprises: in-activity timer, retransmission timer and round trip timer.

4 . The method as in claim 1 , wherein said method comprises determining a minimum value of said DRX cycle duration for which probability of presence of at least one packet within a time interval is greater than a threshold from all available DRX configurations when arrival process of at least one packet among said plurality of packets is known to said UE.

5 . The method as in claim 4 , wherein said method further comprises determining said expected delay and evaluating said on-duration for which said expected delay is less than minimum of delay constraints of said at least one application running in background of said UE, further said method comprises computing said active time of said DRX configuration for said determined minimum value of DRX cycle duration.

6 . The method as in claim 1 , wherein said method comprises arranging said at least one packet among said plurality of packets from said at least one application based on said inter-arrival time and determining a probability density function (PDF) if arrival process of said at least one packet from said at least one application is unknown, wherein said PDF represents a function of said inter-arrival time of said at least one packet over a time interval.

7 . The method as in claim 6 , wherein said method further comprises determining said expected delay and evaluating said on-duration for which said expected delay is less than minimum of delay constraints of said at least one application running in the background of said UE, and computing said active time of said DRX configuration based on said evaluated on-duration and selecting said optimal DRX configuration with minimum active time by said UE, wherein said active time of said DRX configuration is computed by considering the effect of timers of said communication network.

8 .- 9 . (canceled)

10 . A radio access network (RAN) for selecting an optimal discontinuous reception (DRX) configuration for a user equipment (UE) in a communication network, wherein said RAN is configured to:
characterize packet delay as a function of DRX cycle duration and a random variable by said network, wherein said random variable indicates inter-arrival time between packets; determine expected delay for a plurality of packets based on at least one said random variable; evaluate on-duration of said DRX configuration for which said determined expected delay is less than minimum of delay constraints of at least one application running in background of said UE; and compute active time of said DRX configuration based on said evaluated on-duration and selecting said optimal DRX configuration with minimum active time for said UE.

11 . The RAN as in claim 10 , wherein said RAN is further configured to communicate said selected optimal DRX configuration to said UE.

12 . The RAN as in claim 10 , wherein said active time of said DRX configuration is computed by considering the effect of at least one timer of said communication network, wherein said timer comprises: in-activity timer, retransmission timer and round trip timer.

13 . The RAN as in claim 10 , wherein said RAN is configured to determine a minimum value of said DRX cycle duration for which probability of presence of at least one packet within a time interval is greater than a threshold from all available DRX configurations when arrival process of at least one packet among said plurality of packets is known to said UE, and to determine said expected delay and evaluate said on-duration for which said expected delay is less than minimum of delay constraints of said at least one application running in background of said UE, and to compute said active time of said DRX configuration for said determined minimum value of DRX cycle duration.

14 . (canceled)

15 . The RAN as in claim 10 , wherein said RAN is further configured to arrange said at least one packet among said plurality of packets from said at least one application based on said inter-arrival time and determining a probability density function (PDF) if arrival process of said at least one packet from said at least one application is unknown, wherein said PDF represents a function of said inter-arrival time of said at least one packet over a time interval.

16 . The RAN as in claim 15 , wherein said RAN is further configured to determine said expected delay and evaluating said on-duration for which said expected delay is less than minimum of delay constraints of said at least one application running in the background of said UE.

17 . The RAN as in claim 15 , wherein said RAN is further configured to compute said active time of said DRX configuration based on said evaluated on-duration and selecting said optimal DRX configuration with minimum active time by said UE, wherein said active time of said DRX configuration is computed by considering the effect of timers of said communication network.

18 . A user equipment (UE) for selecting an optimal discontinuous reception (DRX) configuration, wherein said UE comprises:
an integrated circuit further comprising at least one processor; at least one memory having a computer program code within said circuit; said at least one memory and said computer program code with said at least one processor cause said UE to characterize packet delay as a function of DRX cycle duration and a random variable, wherein said random variable indicates inter-arrival time between packets; determine expected delay for a plurality of packets based on at least one said random variable; evaluate on-duration of said DRX configuration for which said determined expected delay is less than minimum of delay constraints of at least one application running in background of said UE; and compute active time of said DRX configuration based on said evaluated on-duration and selecting said optimal DRX configuration with minimum active time.

19 . The UE as in claim 18 , wherein said UE is configured to communicate said selected optimal DRX configuration to a radio access network (RAN).

20 . The UE as in claim 18 , wherein said active time of said DRX configuration is computed by considering the effect of at least one timer of said communication network, wherein said timer comprises: in-activity timer, retransmission timer and round trip timer.

21 . The UE as in claim 18 , wherein said UE is con

Assignees

• Samsung Electronics Co Ltd

Inventors

• CHAKRAPANI Aravind Surapura
• Manavalan Karthik Rangaraj

Classifications

• H04W52/0216 Primary

  using a pre-established activity schedule, e.g. traffic indication frame · CPC title

• H04W76/048

  Electricity · mapped topic

• Y02D30/70

  in wireless communication networks · CPC title

• H04W76/28

  Discontinuous transmission [DTX]; Discontinuous reception [DRX] · CPC title

• H04W52/02

  Power saving arrangements · CPC title