WO2015056920A1 - A method and system for selecting an optimal drx configuration - Google Patents

A method and system for selecting an optimal drx configuration Download PDF

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Publication number
WO2015056920A1
WO2015056920A1 PCT/KR2014/009432 KR2014009432W WO2015056920A1 WO 2015056920 A1 WO2015056920 A1 WO 2015056920A1 KR 2014009432 W KR2014009432 W KR 2014009432W WO 2015056920 A1 WO2015056920 A1 WO 2015056920A1
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WO
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Prior art keywords
drx
duration
drx configuration
packet
delay
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PCT/KR2014/009432
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English (en)
French (fr)
Inventor
Arvind CHAKRAPANI
Karthik R.M.
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Samsung Electronics Co., Ltd.
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Application filed by Samsung Electronics Co., Ltd. filed Critical Samsung Electronics Co., Ltd.
Priority to US15/029,620 priority Critical patent/US9900838B2/en
Publication of WO2015056920A1 publication Critical patent/WO2015056920A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is leader and terminal is follower
    • H04W52/0216—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is leader and terminal is follower using a pre-established activity schedule, e.g. traffic indication frame
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/02—Power saving arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/28—Discontinuous transmission [DTX]; Discontinuous reception [DRX]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • 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
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to field of wireless communication networks and more particularly relates to a method and system for selecting an optimal Discontinuous Reception (DRX) configuration for a User Equipment (UE) in the wireless communication network.
  • DRX Discontinuous Reception
  • UE User Equipment
  • the 3rd Generation Partnership Project (3GPP) acting as an important organization in mobile communication field, greatly pushes the standardization of Third Generation (3G) techniques and has proposed a series of standards including Wide Code Division Multiple Access (WCDMA), High Speed Downlink Packet Access (HSDPA), High Speed Uplink Packet Access (HSUPA) and so on.
  • WCDMA Wide Code Division Multiple Access
  • HSDPA High Speed Downlink Packet Access
  • HSUPA High Speed Uplink Packet Access
  • IP Internet Protocol
  • DRX Discontinuous Reception
  • the UE and the network negotiate the connection details.
  • the UE will enter a "sleep" state and wake periodically to "listen” for paging messages, or be in an active state when a paging message can be received.
  • sleep states part of the negotiation of the UE with the network may be to determine and set a sleep period, or a period of inactivity.
  • the network knows when the UE will be expecting paging signals, and can transmit paging signals during a period of time when the UE will be listening for such paging signals.
  • the sleep period negotiated between the UE and the wireless network is fixed.
  • the sleep period may be set according to a profile set up on the UE, and may be different for different types of UE and so on.
  • the period is fixed.
  • a sleep period that is too long may result in unnecessary or even unacceptable levels of delay in receiving a paging signal.
  • a sleep period that is too short may significantly reduce the operating life of the battery in the UE (i.e., by depleting battery power by waking up too frequently).
  • LTE Long Term Evolution
  • LTE-A LTE-Advanced
  • LTE also supports DRX to allow the UE to save battery power consumption by exploiting the bursty nature of packet arrival, while maintaining minimal packet-delay.
  • the UE can be in two different states, RRC_CONNECTED and RRC_IDL. In the former state, there is a connection established between the UE and the Radio Resource Controller (RRC) and data transfer between UE and the evolved NodeB (eNB) can take place. If there is no data traffic for longer than a specified time, then DRX can be configured by the RRC where the UE is in RRC_CONNECTED state with multiple background applications running.
  • RRC Radio Resource Controller
  • the UE with DRX functionality enabled monitors the Physical Downlink Control Channel (PDCCH) discontinuously.
  • PDCCH Physical Downlink Control Channel
  • Ton on-duration
  • off-duration the power-down mode for Toff
  • the applications generating uplink (UL) and receiving downlink (DL) packets according to random distributions.
  • UL uplink
  • DL downlink
  • the principal object of the embodiments herein is to provide a method and system for selecting an optimal Discontinuous Reception (DRX) configuration for a User Equipment (UE) in a communication network.
  • DRX Discontinuous Reception
  • Another object of the invention is to provide a method and system for selecting an optimal DRX configuration when the arrival processes of the packets are either known or unknown.
  • Another object of the invention is to provide a method and system that provides a mechanism for selecting the most suitable DRX configuration which meets the required delay constraints when multiple applications are running in the background of the UE.
  • the invention provides a method for selecting an optimal Discontinuous Reception (DRX) configuration for a User Equipment (UE) in a communication network, wherein the method comprises characterizing packet delay as a function of DRX cycle duration and a random variable by the UE, wherein the random variable indicates inter-arrival time between packets.
  • the method further comprises determining expected delay for a plurality of packets based on at least one random variable.
  • the method comprises evaluating on-duration of the DRX configuration for which the determined expected delay is less than minimum of delay constraints of at least one application running in background of the UE.
  • the method further comprises computing active time of the DRX configuration based on the evaluated on-duration and selecting the optimal DRX configuration with minimum active time by the UE.
  • the invention provides a Radio Access network (RAN) for selecting an optimal Discontinuous Reception (DRX) configuration for a User Equipment (UE) in a communication network, wherein the network is configured to characterize packet delay as a function of DRX cycle duration and a random variable by the network, wherein the random variable indicates inter-arrival time between packets. Further, the network is configured to determine expected delay for a plurality of packets based on at least one random variable.
  • RAN Radio Access network
  • DRX Discontinuous Reception
  • UE User Equipment
  • the network is configured to evaluate on-duration of the DRX configuration for which the determined expected delay is less than minimum of delay constraints of at least one application running in background of the UE and the network is further configured to compute active time of the DRX configuration based on the evaluated on-duration and selecting the optimal DRX configuration with minimum active time for the UE.
  • the invention provides a User Equipment (UE) for selecting an optimal Discontinuous Reception (DRX) configuration, wherein the UE comprises an integrated circuit. Further the integrated circuit comprises at least one processor and at least one memory. The memory comprises a computer program code within the circuit. At least one memory and the computer program code with the at least one processor cause the UE to characterize packet delay as a function of DRX cycle duration and a random variable, wherein the random variable indicates inter-arrival time between packets. Further, the UE is configured to determine expected delay for a plurality of packets based on at least one random variable. The UE is further configured to evaluate on-duration of the DRX configuration for which the determined expected delay is less than minimum of delay constraints of at least one application running in background of the UE. Further, the UE is configured to compute active time of the DRX configuration based on the evaluated on-duration and selecting the optimal DRX configuration with minimum active time.
  • UE User Equipment
  • DRX Discontinuous Reception
  • FIG. 1 illustrates the block diagram of a user equipment with various modules, according to embodiments as disclosed herein, according to the embodiments as disclosed herein;
  • FIG. 2 illustrates the structure of DRX cycles, according to the embodiments as disclosed herein;
  • FIG. 3 illustrates the DRX cycle with the presence of timers, according to the embodiments as disclosed herein;
  • FIG. 4 illustrates a flow diagram explaining the various steps involved in selecting the DRX configuration when the packet arrival process is known, according to the embodiments as disclosed herein;
  • FIG. 5 illustrates a flow diagram explaining the various steps involved in selecting the DRX configuration when the packet arrival process is unknown, according to the embodiments as disclosed herein;
  • FIG. 6 is a graph that shows the behavior of expected delay and on-duration based on the DRX cycle duration, according to the embodiments as disclosed herein;
  • FIG. 7 illustrates a computing environment implementing the method and system for selecting the optimal DRX configuration for the user equipment, according to the embodiments as disclosed herein.
  • the embodiments herein achieve a method and system for selecting an optimal DRX configuration for a User Equipment (UE) in a communication network.
  • 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).
  • 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.
  • FIGS. 1 through 7 where similar reference characters denote corresponding features consistently throughout the figures, there are shown preferred embodiments.
  • FIG. 1 illustrates the block diagram of a user equipment with various modules, according to embodiments as disclosed herein, according to the embodiments as disclosed herein.
  • the user equipment (UE) 100 comprises a communication interface module 101, a power module 102, a display module 103 and a memory module 104.
  • the communication interface module 101 helps the UE to connect to the wireless network.
  • the power module 102 holds the battery information and status of battery power in the user equipment 100.
  • the battery information comprises the amount of charge that the device possesses and the time period for which the user equipment 100 will be in operation and so on.
  • the display module 103 of the user equipment 100 comprises of a user interface which can be a virtual keypad or through any other means by which a user can input some data into the user equipment 100.
  • the memory module 104 may include a random access memory (RAM) or another type of dynamic storage device that may store information and instructions, for example an application, for execution by processor, a read-only memory (ROM) device or another type of static storage device.
  • FIG. 2 illustrates the structure of DRX cycles, according to the embodiments as disclosed herein.
  • the UE 100 with DRX functionality enabled monitors the Physical Downlink Control Channel (PDCCH) discontinuously.
  • PDCCH Physical Downlink Control Channel
  • the UE 100 monitors the PDCCH for a duration Ton (on-duration), and then enables the power-down mode for Toff (off-duration), thereby reducing the battery power consumption.
  • FIG. 3 illustrates the DRX cycle with the presence of timers, according to the embodiments as disclosed herein.
  • the figure depicts the DRX cycle with different timers associated with it and their influence on the on-duration of the DRX cycle based on the packet arrival process.
  • the DRX cycle comprises on-duration, inactivity-timer (Tin), Round Trip Time (RTT) timer, retransmission-timer (Trx) and DRX-short cycle-timer.
  • Tin specifies the number of consecutive PDCCH subframes the UE should be awake after successfully decoding a PDCCH, indicating a new UL or DL data transmission.
  • Ton keeps the UE 100 awake when there are new data packets expected. ‘Tin’ is re-started on the arrival of each subsequent new packet. Due to the arrival of new packets, and Tin, the duration of Ton can be extended by an amount as shown in the figure.
  • Ton The sum of Ton and gives the total time for which the UE is awake and is represented as the active duration, Tactive.
  • the RTT-timer and the Trx also contribute to the active duration.
  • the RTT-timer specifies the minimum amount of subframes before a retransmission is expected by the UE 100 and the UE 100 can go to sleep during this time.
  • NACK negative-acknowledgment
  • Trx specifies the maximum number of consecutive PDCCH subframes where a retransmission is expected by the UE after the first available retransmission time. Further, if an acknowledgment (ACK) is received, then Trx is not started.
  • the active time includes Ton, time when UE is monitoring PDCCH due to Tin, UL grant reception and Trx.
  • RTTUL and RTTDL denote the UL and DL RTT timer values respectively and these values are fixed.
  • the DRX configuration consisting of the values of Tp, Ton, Tin, and Trx is provided to the UE by the base station (eNB). These values provided by the base station are fixed and leads to the wastage of battery power of the UE 100.
  • the UE 100 can suggest the optimal DRX configuration from the available DRX configurations to the eNB.
  • the method for selecting the optimal DRX configuration that maximizes the power savings with an acceptable delay is provided herein RTT timer.
  • an expression for expected delay in the absence of the timers is derived.
  • the inter-arrival time between packets is represented by a Random Variable (RV) W and with a probability density function fw (w).
  • the maximum packet delay ‘D’ is characterized as a function of Tp, fw (w) and the expected maximum delay E(D) is computed.
  • Ton* an initial estimate of on-duration (denoted as Ton* ) is calculated for which the E(D) is less than a given threshold. Further, the Ton* is used to determine the active time (Tactive) in the presence of timers of the communication network.
  • the maximum packet delay ‘D’ is defined as the time form the first packet arrival during Toff to the end of that DRX cycle.
  • the delay D can be computed as
  • Equation (3) gives the reminder of (W/Tp) and can be rewritten as
  • the RV G is defined as
  • G is a discrete RV and has a Probability Mass Function (PMF) denoted by PG (g).
  • ‘X’ can have values which are negative integer multiples of Tp.
  • X is a discrete RV, whereas W is continuous.
  • Equation (18) is valid for any packet arrival process.
  • the expected delay E(D) is given by equation (5).
  • E(YZ) in equation (5) the joint PDF fy,z (y, z) is defined as
  • Equation (5) the expected delay E(D) can be given by
  • the expected delay E(D) can be calculated for any arrival process.
  • T*on for which E (D) is below a certain value (threshold) serves as an initial estimate and T(c )active in the DRX cycle ‘c’ can be represented as
  • B(.) is a time varying function of T*on, Tin , Trx , RTTDL, RTTUL and fw(w).
  • Tin is considered alone and the expected Tactive is derived as described below.
  • the in-activity timer extends the duration for which the UE 100 is in active state monitoring the PDCCH.
  • t1 (c), t2 (c),.... denote the inter-arrival times between new packets in the DRX cycle ‘c’.
  • the UE 100 can enter into sleep mode for the first time ti (c) becomes greater than Tin and .
  • N(c) denotes the number of the packet whose arrival happens after Tin has expired. It can be shown that the number of packets which have arrived before Tin expires (N(c) - 1) is a geometric RV. Due to Tin, Ton in the DRX cycle ‘c’ is extended by an amount .
  • Tin is restarted till the inter-arrival time between packets exceeds Tin for the first time.
  • Ton (1) Ton *.
  • Tp is selected from a set of possible configurations defined in 3GPP.
  • RTT Red Trip Time
  • RTX retransmission timers
  • RTT Round Trip Timer
  • rtx retransmission timer
  • the value of is associated with the probability of successful reception of a packet, whereas is associated with the probability of failure and the value of Trx.
  • a typical TCP keep alive frame is of length 60 bytes, resulting in high probability of successful reception.
  • the expected delay is calculated when there is a single arrival process and distribution of the arrival process is known.
  • the PDF of the packet arrival process is typically unknown, particularly when there are multiple applications running.
  • a single application may generate packets according to a compound process. The method for selecting the optimal DRX configuration when the arrival distribution of individual applications is known is explained herein.
  • FIG. 4 illustrates a flow diagram explaining the various steps involved in selecting the DRX configuration when the packet arrival process is known, according to the embodiments as disclosed herein.
  • the flow diagram 400 provides the method for selecting the optimal DRX configuration for the UE 100 when the packet arrival process is known. Initially, the UE 100 is configured to determine (401) the probability of presence of a packet over a time interval (say for example (0, t]).
  • some packets have atypical lengths and do not belong to Skype.
  • the corresponding inter-arrival times of those packets are removed from the original packet inter-arrival times and the pruned packet inter-arrival time is obtained.
  • a new packet can either be due to packet from Skype traffic or a new call
  • the PMF of the overall packet arrival process, N(t) can be obtained as explained below.
  • the UE 100 is configured to determine (403) the expected delay E(D). Initially the UE 100 is configured to determine E(Y) and E(Z) using the equations (25 and 26) respectively before determining the expected delay E(D).
  • the UE 100 is configured to calculate the on-duration of the DRX configuration.
  • the on-duration (Ton*) computed by the UE 100 such that the expected delay E(D) is less than the minimum delay of all the applications that are running on the background of the UE 100.
  • the UE 100 is configured to calculate (404) the active time of DRX configuration using Ton*.
  • the active time of DRX configuration is computed is computed by considering the effect of timers in the communication network (3GPP timers).
  • the active time ( ) of the DRX configuration is determined using the equation (32).
  • the UE 100 is configured to select (405) the DRX configuration with minimum Tactive.
  • the various actions in flow diagram 400 may be performed in the order presented, in a different order or simultaneously. Further, in some embodiments, some actions listed in FIG. 4 may be omitted.
  • FIG. 5 illustrates a flow diagram explaining the various steps involved in selecting the DRX configuration when the packet arrival process is unknown, according to the embodiments as disclosed herein.
  • the flow diagram 500 describes the procedure for determining the arrival process and selecting the optimal DRX configuration for the UE 100 when the packet arrival process is unknown.
  • the UE 100 is configured to arrange (501) the packets based on inter-arrival times.
  • the UE 100 is configured to combine the packets from the applications running in the background of the UE 100.
  • the packets are time stamped and combined based on any ordering procedure O (.).
  • the UE 100 is configured to determine (502) the probability density function (PDF) for determining the packet arrival process.
  • PDF probability density function
  • the PDF can be determined using the equation (18).
  • the determined PDF at step 502 is verified using Kolmogorov-Smirnov (KS) test. If the determined PDF is valid, then the fy(y) for a given DRX cycle (Tp) is determined.
  • KS Kolmogorov-Smirnov
  • the UE 100 is configured to determine (503) the expected delay E(D). Initially the UE 100 is configured to determine E(Y) and E(Z) using the equations (25 and 26) respectively before determining the expected delay E(D).
  • the UE 100 is configured to determine the on-duration of DRX configuration for which the determined expected delay (E(D)) is below a given threshold.
  • the on-duration (Ton*) computed by the UE 100 such that the determined expected delay E(D) is less than the minimum delay of all the applications that are running on the background of the UE 100.
  • the UE 100 is configured to calculate (504) the active time of DRX configuration using Ton*.
  • the active time of DRX configuration is computed by considering the effect of timers in the communication network (3GPP timers).
  • the active time ( ) of the DRX configuration is determined using the equation (32).
  • the steps 502, 503 and 504 are repeated and the UE 100 is configured to select (505) the DRX configuration for which Tactive is minimum.
  • the various actions in flow diagram 500 may be performed in the order presented, in a different order or simultaneously. Further, in some embodiments, some actions listed in FIG. 5 may be omitted.
  • FIG. 6 is a graph that shows the behavior of expected delay and on-duration based on the DRX cycle duration, according to the embodiments as disclosed herein. The graph shown in the figure is plotted for an exponential inter-arrival time of packets.
  • RV geometric random variable
  • E(Y) and E(Z) can be calculated as
  • FIG. 7 illustrates a computing environment implementing the, according to the embodiments as disclosed herein.
  • the computing environment 701 comprises at least one processing unit 704 that is equipped with a control unit 702 and an Arithmetic Logic Unit (ALU) 703, a memory 705, a storage unit 706, plurality of networking devices 708 and a plurality Input output (I/O) devices 707.
  • the processing unit 704 is responsible for processing the instructions of the algorithm.
  • the processing unit 704 receives commands from the control unit in order to perform its processing. Further, any logical and arithmetic operations involved in the execution of the instructions are computed with the help of the ALU 703.
  • the overall computing environment 701 can be composed of multiple homogeneous and/or heterogeneous cores, multiple CPUs of different kinds, special media and other accelerators.
  • the processing unit 704 is responsible for processing the instructions of the algorithm. Further, the plurality of processing units 704 may be located on a single chip or over multiple chips.
  • the algorithm comprising of instructions and codes required for the implementation are stored in either the memory unit 705 or the storage 706 or both. At the time of execution, the instructions may be fetched from the corresponding memory 705 and/or storage 706, and executed by the processing unit 704.
  • networking devices 708 or external I/O devices 707 may be connected to the computing environment to support the implementation through the networking unit and the I/O device unit.
  • the embodiments disclosed herein can be implemented through at least one software program running on at least one hardware device and performing network management functions to control the elements.
  • the elements shown in FIGS. 1 and 7 include blocks which can be at least one of a hardware device, or a combination of hardware device and software module.

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PCT/KR2014/009432 2013-10-14 2014-10-07 A method and system for selecting an optimal drx configuration WO2015056920A1 (en)

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