TWI599247B - Method of discontinuous reception state change - Google Patents

Description

Method for switching the state of discontinuous reception operation

The present invention relates to a method for a wireless communication system, and more particularly to a method for switching a discontinuous reception operation state in a wireless communication system.

With the development of smart phones towards thin and versatile, the lack of standby time has seriously plagued users, and how to save power is the key. The discontinuous reception (DRX) technology under the Long Term Evolution (LTE) system allows the user to enter the power saving mode when no data is received, thereby extending the standby time. In detail, the UE determines whether there is data to be received through the Physical Downlink Control Channel (PDCCH). Therefore, in order to reduce the power consumption of the UE, when the UE has no data to transmit, the discontinuous reception function is implemented. Allows the client to check the physical downlink control channel at regular intervals. In the interval between two consecutive inspections, the UE can turn off the radio frequency (RF) module to save power.

According to the Radio Resource Control (RRC) connection mode of the UE, the discontinuous reception function can be operated in the RRC connection mode and the RRC idle mode. When the UE establishes a radio resource control connection with the evolved base station (eNB), the control message can be exchanged. At this time, the UE is in the radio resource control connection mode, and the discontinuous reception operation in this mode is called active mode. The discontinuous reception operation is characterized in that the UE monitors the physical downlink control channel discontinuously in the interval of transmitting data. For example, when browsing a webpage, the client can turn off the wireless module at the interval of transmitting data to save power, and then when the user finds that there is data to receive, the user can quickly leave the active discontinuous receiving operation to receive the data. In contrast, a UE that is in a discontinuous reception operation in the RRC idle mode may take a long time to leave the discontinuous reception operation to receive data.

In order to implement an active discontinuous reception operation, an active discontinuous reception operation is provided with an inactivity timer (Inactivity Timer). When the UE monitors the downlink control channel of the entity for a period of time and finds that there is no data to receive (that is, when the inactivity timer expires), the discontinuous reception period (DRX cycle) is started, wherein the discontinuous reception period can be divided into short periods. (short DRX) and long cycle (long DRX). It is worth noting that whenever the client successfully receives the entity downlink control channel information, the client must reset the inactivity timer to zero.

In order to save customer-side power more effectively, the 3rd Generation Partnership Project (3GPP) proposed enhanced discontinuous reception operation (enhance DRX, eDRX) in the thirteenth edition of the communication protocol to extend discontinuous reception. Cycles and reduces the number of times the user wakes up (ie, reduces the frequency at which the client listens to the entity's downstream control channel). The enhanced discontinuous reception operation can set the discontinuous reception period according to the data delay time and power demand that the user can tolerate, thus providing an implementation method that is more flexible and effectively saves the power of the user terminal. The enhanced discontinuous reception operation is the same as the conventional discontinuous reception operation, and can be operated in the radio resource control connection mode and the radio resource control idle mode. However, the applicant noticed that when the UE enters the enhanced discontinuous reception operation in the RRC connection mode, the RF module may be off due to the long-time RF module being shut down, resulting in the inability to know the wireless link. The change in capability causes the wireless link to fail or the delivery procedure to fail, thus reducing the mobile terminal's ability to act.

Please refer to the first to second figures. The first to second figures are schematic diagrams of switching the discontinuous reception state in the radio resource control connection mode. As shown in FIG. 1, when the inactivity timer of the UE expires or receives a discontinuous reception operation command transmitted by the evolved base station, the UE enters a discontinuous reception operation (short period or long period discontinuous reception operation). And when the UE's enhanced inactivity timer expires or receives an enhanced discontinuous reception operation command, the UE further enters the enhanced discontinuous reception operation. It is worth noting that the user terminal under the enhanced discontinuous reception operation enters the discontinuous reception operation only when receiving the discontinuous reception operation instruction. In addition, as shown in FIG. 2, when the inactivity timer of the UE expires or receives a discontinuous reception operation command transmitted by the evolved base station, the UE enters a short-period discontinuous reception operation or enhanced discontinuous reception. operating. In other words, the discontinuous reception operation in FIG. 2 does not include a long-period discontinuous reception operation, but an enhanced discontinuous reception operation. In addition, in the first to second figures, when the user receives a new downlink transmission indication in the discontinuous reception operation or the enhanced non-successful reception operation, the UE may leave the discontinuous reception operation or strengthen. The non-continuous receiving operation enters the general continuous receiving operation (ie, the RF module is turned on, and the non-power saving state is entered). Briefly, in the prior art, the state transition between the discontinuous reception operation, the enhanced discontinuous reception operation, and the general reception operation is based on the discontinuous reception operation instruction/enhanced discontinuous reception operation instruction of the enhanced base station. , inactivity timer or new downlink transmission indication. However, this operation state transition mode may still make the user terminal unable to change the operation state in real time, causing the user terminal to be unable to perform signal measurement, and the wireless link failure or the delivery procedure fails.

Accordingly, the present invention provides a method for switching a discontinuous reception state in a wireless communication system to solve the above problems.

The present invention discloses a method for switching a discontinuous reception operation state for a mobile device in a wireless communication system, the method comprising: receiving a threshold for triggering a measurement report from a base station in the wireless communication system And when the mobile device operates in a reinforced discontinuous reception state in a RRC connection mode and detects that a serving cell in the wireless communication system is below the threshold, from the enhanced non- The continuous receiving operation is switched to a discontinuous receiving operation or a continuous receiving operation.

The present invention further discloses a method for switching a discontinuous reception operation state for a mobile device in a wireless communication system, the method comprising: setting a threshold for triggering a handover enhanced discontinuous reception operation; and when The mobile device operates in the enhanced discontinuous reception state in a RRC connection mode, and detects that a serving cell in the wireless communication system is below the threshold, and switches from the enhanced discontinuous reception operation to A discontinuous reception operation or a continuous reception operation.

Please refer to FIG. 3, which is a schematic diagram of a wireless communication system 30 according to an embodiment of the present invention. The wireless communication system 30 can be an advanced Long Term Evolution (LTE) system or other mobile communication system, which is composed of a network and a plurality of user equipments (UEs). . In Figure 3, the network and client are used to illustrate the architecture of the wireless communication system 30. In detail, the network side may be an evolved universal terrestrial global radio access network (evolved-UTRAN, E-UTRAN), which may include a plurality of evolved Node-Bs (eNBs). The client can be a mobile phone, a computer system, a camera, a television, a handheld video game device, a music player, a wireless sensor, and the like. In other applications, the client may also be a positioning computing device that operates in a mobile environment, such as a bus, train, airplane, boat, vehicle, and the like. In addition, according to the transmission direction, the network end and the user end can be regarded as a transmitter or a receiver. For example, for an uplink (UL) transmission, the UE is the transmitter and the network is the receiver; for the downlink (DL) transmission, the network is the transmitter and the client is the client. Receiving end.

Please refer to FIG. 4, which is a schematic diagram of a communication device 40 according to an embodiment of the present invention. The communication device 40 can be the user terminal in FIG. 3, and includes a processing device 400, a storage unit 410, and a communication interface unit 420. The processing device 400 can be a microprocessor or an Application Specific Integrated Circuit (ASIC). The storage unit 410 can be any data storage device for storing a code 414 and reading and executing the code 414 through the processing device 400. For example, the storage unit 410 can be a user identification module (subscriber identification module, SIM), read-only memory (ROM), flash memory (flash memory), random access memory ( Random-access memory (RAM), CD-ROMs, magnetic tapes, hard disks, optical data storage devices, and the like, without limitation. The control communication interface unit 420 can be a wireless transceiver for wirelessly communicating with the network according to the processing result of the processing device 400.

Referring to FIG. 5, FIG. 5 is a schematic diagram of a process 50 according to an embodiment of the present invention. The process 50 is used for a client to change the operating state of the client. The process 50 can be compiled into the code 414 and includes the following steps:

Step 500: Start.

Step 510: Receive a threshold value for triggering a measurement report from the evolved base station.

Step 520: When the UE operates in the enhanced discontinuous reception state in a RRC connection mode, and detects that a serving cell of the UE is lower than the threshold, switching from the enhanced discontinuous reception operation to the non-continuous Continuous receiving operation or continuous receiving operation.

Step 530: End.

According to the process 50, when the UE detects that the signal strength or quality of the serving cell is lower than the threshold, the UE changes from the enhanced discontinuous reception operation to the discontinuous reception operation or the continuous reception operation. Therefore, the UE can turn on the RF module (such as under continuous receiving operation) or turn on the RF module more frequently (such as in short-period or long-period discontinuous receiving operation) to measure neighboring cells to avoid The wireless key failed and the delivery procedure was performed.

In addition, please refer to FIG. 6, which is a schematic diagram of a process 60 according to an embodiment of the present invention. The process 60 is used for a client to change the operating state of the client. The process 60 can be compiled into the code 414 and includes the following steps:

Step 600: Start.

Step 610: Set a threshold value for triggering switching of an enhanced discontinuous reception operation.

Step 620: When the UE operates in the enhanced discontinuous reception state in a RRC connection mode, and detects that a serving cell of the UE is lower than the threshold, switching from the enhanced discontinuous reception operation to the non-continuous Continuous receiving operation or continuous receiving operation.

Step 630: End.

Compared with the process 50, the user terminal in the process 60 defines a threshold value for use as a threshold for triggering the change of the enhanced discontinuous reception operation state, and when the user detects that the signal strength or quality of the serving cell is lower than the critical value. At the time of the value, the client changes from the enhanced discontinuous reception operation to the discontinuous reception operation or the continuous reception operation. Therefore, the UE can turn on the RF module (such as under continuous receiving operation) or turn on the RF module more frequently (such as in short-period or long-period discontinuous receiving operation) to measure neighboring cells to avoid The wireless key failed and the delivery procedure was performed.

It is worth noting that the operation state transition of the UE may be controlled by the network (such as an evolved base station), or may be changed and reported to the network by the user. For example, refer to FIGS. 7-9, which are schematic diagrams of a state of discontinuous reception operation state switching according to an embodiment of the present invention.

In Figure 7, the UE receives a higher threshold of the evolved base station configuration in the continuous receive operation or the discontinuous reception state (see the event and threshold for triggering the measurement report in the protocol version 3GPP TS36.331). ). In addition, the evolved base station can configure the discontinuous reception operation parameters through the radio resource control connection (such as the short-period discontinuous reception operation, the long-period discontinuous reception operation, or the related parameters of the enhanced discontinuous reception operation). To the client. When the UE finds that the signal strength or quality of the serving cell is lower than the critical value under the enhanced discontinuous reception operation, the UE transmits a measurement report including the cause of the trigger event to the evolved base station, so the evolved base station replies discontinuously. Receiving an operation instruction or an operation change indication for instructing the UE to change from the enhanced discontinuous reception operation to the continuous reception operation or the discontinuous reception state. In addition, the evolved base station instructs the UE to delete related parameters (such as periodic parameters) of the enhanced discontinuous reception operation, so that the UE maintains the continuous reception operation or the discontinuous reception operation state. Thereby, the user can perform signal measurement on neighboring cells to avoid the failure of the wireless link and successfully submit the procedure.

Compared with the evolved base station shown in FIG. 7, the discontinuous reception operation instruction or the operation change indication is transmitted to the UE to change the operation state of the user terminal to the continuous reception operation or the discontinuous reception state. In the embodiment shown in FIG. 8, when the UE finds that the signal strength or quality of the serving cell is lower than the critical value under the enhanced discontinuous reception operation, the UE changes from the reinforced discontinuous reception operation to the continuous operation. Receive operation or discontinuous reception operation. In addition, after switching to the continuous receiving operation or the discontinuous receiving operation, the UE notifies the evolved base station of the latest operating state (such as switching to continuous receiving operation, short period or long period discontinuous receiving operation) and starting. The time of the switch (such as the subframe). On the other hand, after the evolved base station receives the operational status reported by the UE, the evolved base station instructs the UE to delete the relevant parameters of the enhanced discontinuous reception operation, so that the UE maintains the continuous reception operation or discontinuous operation. Receive operation status.

In another embodiment of the present invention, as shown in FIG. 9, the UE can define a critical value of the switching enhanced discontinuous reception state by itself, so that when the UE is in the strong discontinuous reception state, the service cell is found to be lower than the critical value. At the time of the value, the UE does not reply to the measurement report, but switches to the continuous reception operation or the discontinuous reception operation, and notifies the evolved base station of the latest operation status and the time to start the handover. Then, the evolved base station instructs the UE to delete the relevant parameters of the enhanced discontinuous reception operation, so that the UE maintains the continuous reception operation or the discontinuous reception operation state.

All of the above steps, including the suggested steps, can be implemented by means of hardware, carcass (ie, a combination of a hardware device and a computer command, data in a hardware device is a read-only software) or an electronic system. The hardware can include analog, digital, and hybrid circuits (ie, microcircuits, microchips, or germanium wafers). The electronic system may include a system on chip (SOC), a system in package (Sip), a computer on module (COM), and a communication device 40.

In summary, the present invention is configured to trigger a threshold for changing the state of the discontinuous reception operation (eg, configuring a higher threshold (compared to the event and threshold for triggering the measurement report in the protocol version 3GPP TS 36.331) Or a newly defined threshold) to enable the UE to switch from an enhanced discontinuous reception operation to a general continuous reception operation or a discontinuous reception operation to avoid wireless key failures and to perform a handover procedure. The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.

40‧‧‧Communication device
400‧‧‧Processing device
410‧‧‧ storage unit
420‧‧‧Communication interface unit
414‧‧‧ Code
50, 60‧‧‧ process
500-530, 600-630‧‧ steps

1 to 2 are schematic diagrams showing a state in which a discontinuous reception operation state is switched in a conventional radio resource control connection mode. FIG. 3 is a schematic diagram of a wireless communication system according to an embodiment of the present invention. 4 is a schematic diagram of a communication device according to an embodiment of the present invention. 5 to 6 are schematic views of a flow of an embodiment of the present invention. 7 to 9 are schematic diagrams showing a state of discontinuous reception operation state switching according to an embodiment of the present invention.

50‧‧‧ Process

500~530‧‧‧Steps

Claims (17)

A method for switching a discontinuous reception operation state for a mobile device in a wireless communication system, the method comprising: receiving a threshold value for triggering a measurement report from a base station in the wireless communication system; When the mobile device operates in a reinforced discontinuous reception state in a radio resource control connection mode, and detects that the signal strength or quality of a serving cell in the wireless communication system is lower than the threshold, The discontinuous reception operation is switched to a discontinuous reception operation or a continuous reception operation. The method of claim 1, further comprising: transmitting the measurement report to the base station, wherein the measurement report includes an event cause that triggers the measurement report. The method of claim 1, further comprising: receiving, from the base station, a parameter regarding the enhanced discontinuous reception operation and the discontinuous reception operation, wherein the parameter includes the enhanced discontinuous reception operation and the discontinuous reception The period of operation. The method of claim 1, wherein the discontinuous reception operation comprises a short period discontinuous reception operation and a long period discontinuous reception operation. The method of claim 1, wherein the mobile device operates in the enhanced discontinuous reception state in the RRC connection mode, and detects the signal strength or quality of the serving cell in the wireless communication system. Below the threshold, the enhanced discontinuous reception operation is changed to The step of receiving the discontinuous reception operation or the continuous receiving operation includes: receiving an operation change indication from the base station, for changing the enhanced discontinuous reception operation to the discontinuous reception operation or the continuous reception operation; and changing the indication according to the operation The discontinuous reception operation or the continuous reception operation is changed from the enhanced discontinuous reception operation. The method of claim 5, wherein the operational change indication is a discontinuous reception operation instruction. The method of claim 1, further comprising: receiving an indication from the base station to delete the parameter regarding the enhanced discontinuous reception operation. The method of claim 1, further comprising: transmitting a latest operating state and starting a change operating state to the base station. A method for switching a discontinuous reception operation state for a mobile device in a wireless communication system, the method comprising: setting a threshold for triggering a handover enhanced discontinuous reception operation; and when the mobile device is in a Switching from the enhanced discontinuous reception operation when operating in the enhanced discontinuous reception state in the RRC connection mode and detecting that the signal strength or quality of a serving cell in the wireless communication system is lower than the threshold To a discontinuous reception operation or a continuous reception operation. The method of claim 9, further comprising: Receiving, from a network end of the wireless communication system, a parameter regarding the enhanced discontinuous reception operation and the discontinuous reception operation, wherein the parameter includes the enhanced discontinuous reception operation and a period of the discontinuous reception operation. The method of claim 10, further comprising: receiving an indication from the base station to delete the parameter regarding the enhanced discontinuous reception operation. The method of claim 9, further comprising: transmitting a latest operating state and starting a change operating state to the base station. A method for switching a discontinuous reception operation state for a base station in a wireless communication system, the method comprising: configuring a threshold for triggering a measurement report to a mobile device in the wireless communication system; Receiving, by the mobile device, the measurement report, wherein the measurement report indicates that a signal strength or quality of a serving cell in the wireless communication system is lower than the threshold; and transmitting an operation change indication to the mobile device to change the The mobile device is connected to a discontinuous reception operation or a continuous reception operation. The method of claim 13, wherein the operation change indication is a discontinuous reception operation instruction. The method of claim 13, further comprising: configuring a parameter regarding the enhanced discontinuous reception operation and the discontinuous reception operation to the mobile device, wherein the parameter includes the enhanced discontinuous reception operation and the discontinuity Receiving operation Cycle. The method of claim 15 further comprising: transmitting an indication to the mobile device to delete the parameter regarding the enhanced discontinuous reception operation. The method of claim 13, further comprising: receiving a latest operational state from the mobile device and starting a time to change the operational state.