KR20160046530A - Method for reducing a bettery waste in a wireless communication system and an user equipment for operating the same - Google Patents

Abstract

A method for efficiently managing a battery in a wireless communication system and a terminal using the same, the method comprising: checking whether a specific timer value exists; Determining whether a Circuit Switched (CS) domain signal is present; And transmitting a signaling connection release indication message if the specific timer value does not exist and the CS domain signal does not exist and no packet switched data is present for a predetermined period of time .

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method for reducing battery consumption in a wireless communication system,

The present invention relates to a wireless communication system, and more particularly, to a method for reducing battery consumption of a terminal and a terminal using the same.

1 is a diagram schematically showing an E-UMTS network structure as an example of a wireless communication system. The Evolved Universal Mobile Telecommunications System (E-UMTS) system evolved from the existing Universal Mobile Telecommunications System (UMTS), and is currently undergoing basic standardization work in 3GPP. In general, E-UMTS may be referred to as an LTE (Long Term Evolution) system. For details of the technical specifications of UMTS and E-UMTS, refer to Release 7 and Release 8 of the " 3rd Generation Partnership Project (Technical Specification Group Radio Access Network ").

1, an E-UMTS includes an Access Gateway (AG) located at the end of a User Equipment (UE), a Node B (eNode B), and an E-UTRAN, . The base station may simultaneously transmit multiple data streams for broadcast services, multicast services, and / or unicast services.

One base station has more than one cell. The cell is set to one of the bandwidths of 1.44, 3, 5, 10, 15, and 20 Mhz, and provides downlink or uplink transmission service to a plurality of UEs. Different cells may be set up to provide different bandwidths. The base station controls data transmission / reception for a plurality of terminals. The base station transmits downlink scheduling information for downlink (DL) data, and notifies the UE of time / frequency region, coding, data size, and HARQ related information to be transmitted to the UE. In addition, the base station transmits uplink scheduling information to uplink (UL) data, and notifies the UE of time / frequency domain, coding, data size, and HARQ related information that the UE can use. An interface for transmitting user traffic or control traffic may be used between the base stations. The Core Network (CN) can be composed of an AG and a network node for user registration of the UE. The AG manages the mobility of the terminal in units of TA (Tracking Area) composed of a plurality of cells.

The Universal Mobile Telecommunications System (UMTS) is a broadband packet based system for the transmission of text, digitized voice, video and multimedia. It is highly subscribed to standards for third generation and is generally based on wideband code division multiple access (W-CDMA).

In the UMTS network, the radio resource control (RRC) portion of the protocol structure is responsible for allocating, configuring and releasing radio resources between the UE and the UTRAN. This RRC protocol is described in detail in the 3GPP TS 25.331 specification. The two basic modes that the UE may have are defined as "idle mode" and "UTRA RRC connection mode" (or simply "connection mode" UTRA represents UMTS terrestrial wireless access. In the idle mode, the UE or other mobile device can respond to a page or any time when a UTRAN or a Serving General Packet Radio Service (GPRS) Support Node (SGSN) paging it to receive data from an external data network, such as a push server, It is required to request an RRC connection whenever it wants to transmit user data. Idle and connection mode behavior is described in detail in 3GPPG standards TS 25.304 and TS 25.331.

When in the UTRA RRC connection mode, the device can be in one of four states. These states,

CELL-DCH: A dedicated channel is allocated to the UE in uplink and downlink in this state to exchange data. The UE shall perform the operation as outlined in 3GPP 25.331.

CELL_FACH: No dedicated channel is assigned to user equipment in this state. Instead, the common channel is used to exchange a small amount of bursty data. The UE should perform the operation as outlined in 3GPP 25.331, including the cell selection process as specified in 3GPP TS 25.304.

CELL_PCH: The UE uses Discontinuous Reception (DRX) to monitor broadcast messages and pages via the Paging Indicator Channel (PICH). No uplink activation is possible. The UE should perform the operation as outlined in 3GPP 25.331, including the cell selection process as specified in 3GPP TS 25.304. The UE has to perform the CELL UPDATE procedure after cell reselection.

URA_PCH: The UE uses Discontinuous Reception (DRX) to monitor broadcast messages and pages via the Paging Indicator Channel (PICH). No uplink activation is possible. The UE should perform the operation as outlined in 3GPP 25.331, including the cell selection process as specified in 3GPP TS 25.304. This state is similar to CELL_PCH except that the URA UPDATE procedure is triggered only via UTRAN registration area (URA) reselection.

The transition from the idle mode to the connected mode and vice versa is controlled by the UTRAN. When the idle mode UE requests an RRC connection, the network determines whether to move the UE to the CELL_DCH or CELL_FACH state. When the UE is in the RRC connection mode, it decides when the network needs to release the RRC connection again. The network may also move from one RRC state to another RRC state before disconnecting or in some cases disconnecting the connection. State transitions are typically triggered by data activity or inactivity between the UE and the network. Since the network can not recognize when the UE has completed exchanging data for a given usage, it typically keeps an RRC connection for a predetermined amount of time expecting more data to and from the UE.

This is typically done to reduce the delay time of call set-up and subsequent radio resource setup. The RRC disconnect message can only be transmitted by the UTRAN. This message releases the signaling link and all radio resources allocated between the UE and the UTRAN. In general, the term "radio bearer" refers to the radio resource allocated between the UE and the UTRAN. The term "radio access bearer " generally refers to a radio resource allocated between a UE and, for example, a serving GPRS service node (SGSN). The present invention may sometimes refer to the term wireless resource, and such term may refer to one or both of a radio bearer and / or a radio access bearer as appropriate.

Wireless communication technologies have been developed to LTE based on WCDMA, but the demands and expectations of users and operators are continuously increasing. In addition, since other wireless access technologies are continuously being developed, new technology evolution is required to be competitive in the future. Cost reduction per bit, increased service availability, use of flexible frequency band, simple structure and open interface, and proper power consumption of terminal.

According to 3GPP TS 25.331, in the current 3GPP LTE (A) system, the fast dormancy operation is applied only when the value of the timer T323 is present. When there is no value of the timer T323, the operation is not instructed and battery consumption is reduced even without RRC signaling The fast dormancy behavior for the application was not applicable and became a problem.

It should be understood that the foregoing description of the background art is merely for the purpose of promoting an understanding of the background of the present invention and is not to be construed as an admission that the prior art is known to those skilled in the art.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for managing a battery of a terminal more efficiently in a wireless communication system.

The technical problems to be solved by the present invention are not limited to the technical problems and other technical problems which are not mentioned can be understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a method of managing a battery of a terminal, comprising: checking whether a specific timer value exists; Determining whether a Circuit Switched (CS) domain signal is present; And transmitting a signaling connection release indication message if the specific timer value does not exist and the CS domain signal does not exist and there is no packet switched data for a predetermined period of time.

According to another aspect of the present invention, there is provided a terminal for transmitting uplink data in a wireless communication system, the terminal comprising: a radio frequency (RF) module; And a process of controlling the radio frequency module, wherein the processor determines whether a particular timer value is present, determines whether a CS (Circuit Switched) domain signal exists, and if the specific timer value does not exist, And transmits a signaling connection release indication message if there is no PS (Packet Switched) data for a predetermined period of time.

Preferably, the specific timer value is a T323 timer value.

Preferably, if the specific timer value exists and the CS domain signal does not exist, if there is no packet-switched data for a predetermined time, a signaling connection release indication message is transmitted.

Preferably, the method further comprises driving the specific timer after transmitting the signaling connection release indication message.

Preferably, the method further comprises receiving a reconfiguration message or an RRC (Radio Resource Control) connection release indication in response to the signaling connection release indication message transmission.

According to the present invention, it is an object of the present invention to reduce the battery waste of the terminal by managing the battery of the terminal more efficiently.

The effects obtainable in the embodiments of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be obtained from the description of the embodiments of the present invention described below by those skilled in the art Can be clearly understood and understood. In other words, undesirable effects of implementing the present invention can also be obtained by those skilled in the art from the embodiments of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. It is to be understood, however, that the technical features of the present invention are not limited to the specific drawings, and the features disclosed in the drawings may be combined with each other to constitute a new embodiment. Reference numerals in the drawings refer to structural elements.
1 shows an E-UMTS network structure as an example of a wireless communication system.
2 shows a control plane and a user plane structure of a radio interface protocol between a UE and an E-UTRAN based on the 3GPP radio access network standard.
3 shows a signaling connection release indication procedure.
4 shows a flowchart of a battery management method when there is a T323 timer.
5 is a flowchart of a battery management method according to an embodiment of the present invention.
6 illustrates a base station and a terminal that can be applied to an embodiment of the present invention.

The following description is to be understood as illustrative and non-limiting, such as code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access And can be used in various wireless access systems. CDMA may be implemented in radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. The TDMA may be implemented in a wireless technology such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE). OFDMA may be implemented in wireless technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and Evolved UTRA (E-UTRA). UTRA is part of the Universal Mobile Telecommunications System (UMTS). 3GPP (3rd Generation Partnership Project) LTE (Long Term Evolution) is part of E-UMTS (Evolved UMTS) using E-UTRA, adopts OFDMA in downlink and SC-FDMA in uplink. LTE-A (Advanced) is an evolved version of 3GPP LTE.

For clarity of description, 3GPP LTE / LTE-A is mainly described, but the technical idea of the present invention is not limited thereto. In addition, the specific terms used in the following description are provided to aid understanding of the present invention, and the use of such specific terms may be changed into other forms without departing from the technical idea of the present invention.

2 is a diagram showing a control plane and a user plane structure of a radio interface protocol between a UE and an E-UTRAN based on the 3GPP radio access network standard. The control plane refers to a path through which control messages used by a UE and a network are transferred. The user plane means a path through which data generated in the application layer, for example, voice data or Internet packet data, is transmitted.

The physical layer as the first layer provides an information transfer service to an upper layer using a physical channel. The physical layer is connected to the upper Medium Access Control layer through a transmission channel (Trans antenna Port Channel). Data moves between the MAC layer and the physical layer over the transport channel. Data is transferred between the transmitting side and the receiving side physical layer through the physical channel. The physical channel utilizes time and frequency as radio resources. Specifically, the physical channel is modulated in an OFDMA (Orthogonal Frequency Division Multiple Access) scheme in a downlink, and is modulated in an SC-FDMA (Single Carrier Frequency Division Multiple Access) scheme in an uplink.

The Medium Access Control (MAC) layer of the second layer provides a service to a radio link control (RLC) layer, which is an upper layer, through a logical channel. The RLC layer of the second layer supports reliable data transmission. The function of the RLC layer may be implemented as a functional block in the MAC. The Packet Data Convergence Protocol (PDCP) layer of the second layer performs a header compression function to reduce unnecessary control information in order to efficiently transmit IP packets such as IPv4 and IPv6 in a wireless interface with a narrow bandwidth.

The Radio Resource Control (RRC) layer located at the bottom of the third layer is defined only in the control plane. The RRC layer is responsible for the control of logical channels, transport channels and physical channels in connection with the configuration, re-configuration and release of radio bearers (RBs). RB denotes a service provided by the second layer for data transmission between the UE and the network. To this end, the terminal and the RRC layer of the network exchange RRC messages with each other. If there is an RRC connection (RRC Connected) between the UE and the RRC layer of the network, the UE is in the RRC Connected Mode, otherwise it is in the RRC Idle Mode. The Non-Access Stratum (NAS) layer at the top of the RRC layer performs functions such as session management and mobility management.

One cell constituting the base station eNB is set to one of the bandwidths of 1.4, 3, 5, 10, 15, and 20 MHz to provide downlink or uplink services to a plurality of UEs. Different cells may be set up to provide different bandwidths.

A downlink transmission channel for transmitting data from a network to a terminal includes a BCH (Broadcast Channel) for transmitting system information, a PCH (Paging Channel) for transmitting a paging message, a downlink SCH (Shared Channel) for transmitting user traffic or control messages, have. In case of a traffic or control message of a downlink multicast or broadcast service, it may be transmitted through a downlink SCH, or may be transmitted via a separate downlink multicast channel (MCH). Meanwhile, the uplink transmission channel for transmitting data from the UE to the network includes a random access channel (RACH) for transmitting an initial control message and an uplink SCH (shared channel) for transmitting user traffic or control messages. A logical channel mapped to a transport channel is a broadcast control channel (BCCH), a paging control channel (PCCH), a common control channel (CCCH), a multicast control channel (MCCH) Traffic Channel).

3 shows a signaling connection release indication procedure.

The signaling disconnection indication procedure is used by the UE to indicate to the UTRAN that one of its signaling connections has been released. This procedure can then initiate the RRC disconnect procedure.

When the UE receives a request to release (abort) the signaling connection from the upper layer for a particular CN domain,

One) If there is a signaling connection of the variable ESTABLISHED_SIGNALLING_CONNECTIONS for the particular CN domain identified by the IE "CN domain identity ", initiates the signaling disconnect indication procedure.

2) If not, it stops any ongoing signaling connection to that particular CN domain.

When initiating the signaling connection release indication procedure in the CELL_PCH or URA_PCH state,

One)  If the variable READY_FOR_COMMON_EDCH is set to TRUE:

A. Moves to the CELL_FACH state;

B. If the periodic cell update is configured by T305 of IE "UE timer and constant in connection mode " set to any other value than" infinite ", then the timer T305 is restarted using its initial value.

2) Otherwise, if the variable H_RNTI and the variable C_RNTI are set, the signaling connection release indication procedure is continued.

3) If the variable H_RNTI and the variable C_RNTI are not set, the cell update procedure is performed using the " uplink data transmission ", and the signaling connection release indication process is continued when the cell update procedure is publicly completed.

The UE sets the IE "CN domain identity" to the value indicated by the upper layer. The value of IE indicates the CN domain with the associated signaling connection indicating that the upper layer is released. If the UE includes IE "Signaling Connection Release Indication Cuase" and is not set to "UE Requested PS Data session End", IE "Signaling Connection Release Indication Cuase" is set to "any other cause". And transmits a 'signaling disconnection indication message' on the DCCH using the AM RLC. If the IE "Signaling Connection Release Indication Cuase" set to "UE Requested PS Data session End" is not included in the signaling disconnection indication message, the signaling connection with the identity indicated by the upper layer is removed from the variable ESTABLISHED_SIGNALLING_CONNECTIONS.

If the successful transmission of the signaling disconnection indication message is confirmed by the RLC, the procedure is terminated.

Further, if the value of the timer T323 is stored in the IE "UE timer and constant in connection mode " in the variable TIMERS_AND_CONSTANTS and there is no CS (Circuit Switched) domain connection indicated in the variable ESTABLISHED_SIGNALLING_CONNECTIONS,

One) If the upper layer indicates that there is no more Packet Switched (PS) data for an extended period of time,

A. If timer T323 does not work,

i. If the UE is in the CELL_DCH state or the CELL_FACH state,

ii. If the UE is in the CELL_PCH state or the URA_PCH state and the DRX cycle length is shorter than the length of the CN domain specific DRX cycle for the PS domain or the CS domain,

iii. If the UE is in the CELL_PCH state or URA_PCH state and the DRX cycle length is greater than or equal to the length of the CN domain specific DRX cycle for the PS domain or the CS domain and V361 <

The UE increments V361 by 1 and sets IE "CN domain identity" to the PS domain. IE "signaling connection release indication cause" to "end of PS data session of UE request ". And transmits a 'signaling disconnection indication message' on the DCCH using the AM RLC. Start timer T323.

The UE will be prohibited from transmitting the 'Signaling Disconnection Indication' message with IE "Signaling Disconnection Indication Cause" set to "End PS Data Session of UE Request" while timer T323 is in operation.

If the PS data becomes transmittable or the UE receives a paging message triggering the cell update procedure, the UE will set V316 to zero.

If re-establishment of the transmitting side of the RLC entity in the signaling radio bearer RB2 occurs before the RLC confirms the successful delivery of the 'signaling disconnection indication' message, then the UE transmits the uplink DCCH using the AM RLC in the signaling radio bearer RB2. Quot; signaling connection release indication &quot; message.

If the inter-RAT handover from the UTRAN procedure occurs before the RLC confirms successful delivery of the 'signaling disconnect' message, the UE stops signaling connections while in the new RAT.

When receiving the message signaling disconnection indication message, if the IE signaling disconnection indication cause is not included, the UTRAN requests the higher layer to release the signaling connection. The upper layer can then initiate the release of the signaling connection.

If the signaling disconnection indication message includes the IE signaling disconnection indication cause, the UTRAN may initiate a state transition to an efficient battery consumption mode IDLE, CELL_PCH, URA_PCH, or CELL_FACH state.

When the timer T323 expires, the UE determines whether any subsequent indication that there is no more PS data for an extended period of time is from the upper layer, in which case the UE starts transmitting a single 'signaling disconnect indication' message, Exit the procedure.

The above-mentioned T323 represents the values defined in the following Table 1. [

[Table 1]

4 shows a flowchart of a battery management method when there is a T323 timer.

According to FIG. 4, if there is a T323 value (S401), there is no CS domain connection (S403), and if there is no PS data for a long time (S405), the UE transmits a signaling connection release indication message for fast dormancy The terminal itself can transmit (S407).

In the case of FIG. 4, it is checked whether a signaling connection release indication message for fast dormancy can be transmitted only when the value of T323 is present. Further, according to the RRC state, a signaling connection release indication message is transmitted by checking the condition, and the T323 timer is driven (S409).

If the T323 timer is active, you can not send a signaling connection release indication message for fast dormancy.

In the case of FIG. 4, when there is no T323 timer value, there is a problem because the battery management method for fast dormancy is not specified. If there is no PS data for a long time without the T323 value, the terminal can not perform a fast dormancy operation which can reduce battery consumption, and thus the battery is continuously consumed. As a result, the battery life may be shortened. In addition, the Cell_DCH has a problem that the consumption time of the UE is shortened because the battery consumption is much higher than other RRC states.

5 is a flowchart of a battery management method according to an embodiment of the present invention.

As a means for solving the above-mentioned problems, a method for reducing battery consumption more efficiently than the conventional technique is proposed.

According to this embodiment, even if there is no T323 value, if there is no PS data for a long time, a signaling connection release indication message for fast dormancy is once transmitted and the T323 timer is not operated.

If it is determined that the T323 value is stored, if the T323 value is stored, the operation is performed as shown in FIG.

If there is a T323 value (S401), there is no CS domain connection (S403), and there is no PS data for a long time (S405), the UE can transmit a signaling connection release indication message for fast dormancy by itself (S407).

If there is no PS data for a long period of time (S505), a signaling connection release indication message for fast dormancy is transmitted even if the T323 value is not stored (S501), if CS domain signaling is not present (S503) (S507).

According to FIG. 5, it is possible to reduce battery consumption by taking a fast dormancy operation even if there is no T323 value, and it is possible to transfer the state of the terminal by only modifying the operation of the terminal without changing the network operation.

6, the wireless communication system includes a base station (BS) 610 and a user equipment (UE) 620. The base station 610 includes a processor 612, a memory 614, and a radio frequency (RF) unit 616. The processor 612 may be configured to implement the procedures and / or methods suggested by the present invention. The memory 614 is coupled to the processor 612 and stores various information related to the operation of the processor 612. [ The RF unit 616 is coupled to the processor 612 and transmits and / or receives radio signals. The user equipment 620 includes a processor 622, a memory 624 and an RF unit 626. [ The processor 622 may be configured to implement the procedures and / or methods suggested by the present invention. The memory 624 is coupled to the processor 622 and stores various information related to the operation of the processor 622. [ The RF unit 1126 is coupled to the processor 622 and transmits and / or receives radio signals. The base station 610 and / or the user equipment 620 may have a single antenna or multiple antennas.

The embodiments described above are those in which the elements and features of the present invention are combined in a predetermined form. Each component or feature shall be considered optional unless otherwise expressly stated. Each component or feature may be implemented in a form that is not combined with other components or features. It is also possible to construct embodiments of the present invention by combining some of the elements and / or features. The order of the operations described in the embodiments of the present invention may be changed. Some configurations or features of certain embodiments may be included in other embodiments, or may be replaced with corresponding configurations or features of other embodiments. It is clear that the claims that are not expressly cited in the claims may be combined to form an embodiment or be included in a new claim by an amendment after the application.

Embodiments in accordance with the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof. In the case of hardware implementation, an embodiment of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs) field programmable gate arrays, processors, controllers, microcontrollers, microprocessors, and the like.

In the case of an implementation by firmware or software, an embodiment of the present invention may be implemented in the form of a module, a procedure, a function, or the like which performs the functions or operations described above. The software code can be stored in a memory unit and driven by the processor. The memory unit may be located inside or outside the processor, and may exchange data with the processor by various well-known means.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit of the invention. Accordingly, the above description should not be construed in a limiting sense in all respects and should be considered illustrative. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the scope of equivalents of the present invention are included in the scope of the present invention.

610:
612: Processor
614: Memory
616: RF unit
620:
622: Processor
624: Memory
626: RF unit

Claims (10)

A method for managing a battery of a terminal,
Determining whether a specific timer value is present;
Determining whether a Circuit Switched (CS) domain signal is present; And
And transmitting a signaling connection release indication message if the specific timer value does not exist and the CS domain signal is not present and no packet switched data is present for a predetermined period of time. The method according to claim 1,
The specific timer value may be,
T323 &lt; / RTI &gt; timer value. The method according to claim 1,
And transmitting a signaling connection release indication message if the specific timer value is present and the CS domain signal is not present and no packet switched (PS) data is present for a predetermined period of time. The method of claim 3,
Further comprising: after the sending of the signaling connection release indication message, driving the specific timer. The method according to claim 1,
Further comprising receiving a reconfiguration message or an RRC (Radio Resource Control) connection release indication in response to the signaling connection release indication message transmission. A terminal for managing a battery,
A radio frequency (RF) module; And
A process for controlling the radio frequency module,
The processor comprising:
Determines whether there is a specific timer value, determines whether there is a CS (Circuit Switched) domain signal,
And transmits a signaling connection release indication message if packet switching data does not exist for a predetermined time when the specific timer value does not exist and the CS domain signal does not exist. The method according to claim 6,
The specific timer value may be,
T323 &lt; / RTI &gt; timer value. The method according to claim 6,
The processor comprising:
Further comprising transmitting a signaling connection release indication message if there is no packet switched data for a predetermined time period when the specific timer value exists and the CS domain signal does not exist. 9. The method of claim 8,
Wherein the processor further comprises driving the specific timer after transmitting the signaling connection release indication message. The method according to claim 6,
Wherein the processor is further configured to receive a reconfiguration message or an RRC (Radio Resource Control) connection release indication in response to the signaling connection release indication message transmission.

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