TW201501558A - Method and apparatus for power saving of idle mode user equipments - Google Patents

Abstract

The present invention provides a method and apparatus for power saving of an idle mode user equipment. The method includes: configuring an extended DRX cycle greater than both a regular DRX cycle and an SFN cycle; and sending the extended DRX cycle to the UE for use by the UE to listen to a paging message in the idle mode.

Description

Method and apparatus for energy saving in idle mode user equipment

The present invention relates generally to the field of wireless communications, and more particularly to methods and apparatus for power saving for idle mode user equipment (UE).

It is known that for idle mode UEs, it is a common method to use a discontinuous reception (DRX) mechanism to monitor paging messages and save power. When the UE is in the RRC_IDLE state, the UE can use DRX to monitor only paging messages in a particular subframe. Specifically, the UE may calculate the paging frame (PF) number and the paging occasion (PO) subframe number in the paging frame by using the system configuration parameter and the UE's International Mobile Subscriber Identity (IMSI) according to the DRX cycle. . Therefore, in DRX paging, the UE only needs to receive the Physical Downlink Control Channel (PDCCH) once at a specific paging time in each DRX cycle, and at other times, it can go to the sleep state to save power.

When in the RRC_IDLE state, the UE is only in DRX mode. In 3GPP TS 36.304 (Reference [1]), the processing for the idle mode UE defines how to use the DRX mechanism to maintain paging monitoring. In the literature [1] In the following, a paging frame (PF) number and a paging occasion (PO) subframe number are defined as follows: paging frame number (PF) = SFN mod T = (T/N) × (UE_ID mod N), which is pointed according to the subframe mapping table. The index of the PO i_s: i_s = floor (UE_ID / N) mod Ns.

Where SFN is the system frame number and T is the DRX cycle of the UE. T is the smaller of the UE-specific DRX period value assigned by the higher layer and the preset paging period (ie, DRX period) value broadcast in the system information. If the higher layer does not allocate a UE-specific DRX cycle, the preset DRX cycle value is used. In the following description herein, the DRX cycle is described by taking the preset DRX cycle value broadcast in the system information as an example.

Note: floor is a round-down operator, and mod is a modulo operator.

The preset DRX period of the idle mode UE is equal to the preset paging period in the community broadcasted within the SystemInformationBlockType2 (SIB2) message, which is defined in the current RRC protocol 3GPP TS 36.331 (literature [2]).

Where nB is a value selected from the set (4T, 2T, T, T/2, T/4, T/8, T/16, T/32); N=min(T, nB) refers to a DRX The number of paging frames in the cycle; Ns=max(1, nB/T) refers to the number of subframes (PO) in a paging frame, which may be 1, 2 or 4; UE_ID = IMSI mod 1024, where IMSI is the UE's international mobile user identification The code is given as a decimal integer (0...9).

The subframe mapping table is shown in Table 1 below:

The current maximum paging period, the regular DRX cycle, is 2.56 seconds. The current SFN period value is set to 0-1023. An SFN period is 10.24 seconds. Obviously, the DRX cycle is less than the SFN cycle, which ensures that the PF and PO calculation results are unique in one SFN cycle. The base station and the UE are not confused when performing the DRX mechanism using the calculated PF and PO.

On the other hand, considering the community reselection problem, the idle UE will measure the reference signal received power (RSRP) and reference signal received quality (RSRQ) of the community it serves at least once per DRX cycle. For neighboring community measurements, including inter-frequency/intra-frequency measurements or radio access technology (RAT) neighboring inter-cell measurements, the time interval during which the idle UE will perform community reselection measurements in each of the neighboring communities (T-Reselection) Perform a measurement as defined in 3GPP TS 36.331 (literature [2]). In 3GPP TS 36.331 (literature [2]), the cell T-Reselection refers to the community reselection timer Treselection _RAT for E-UTRA, UTRA, GERAN or CDMA2000, in seconds, currently in 3GPP TS 36.331 The value defined in the range is 0-7 seconds.

In order to reduce the power consumption in the idle mode, it is desirable for the UE to wake up to monitor the paging message at a lower frequency to save energy. This is very advantageous for UEs that have a high tolerance to delay and are infrequently transmitted, such as machine type communication (MTC) devices.

Therefore, it is necessary to extend the DRX cycle in which the UE wakes up to monitor the paging message to save energy. According to the latest SA (Service & System Aspects) discussion, in 3GPP TR 23.887 (Reference [3]) Part 7 "UE Power Consumption Optimizations (UEPCOP)", the extended DRX cycle is adopted to enable the UE to wake up and intercept. Saving battery when potential paging messages is a major power optimization scheme for idle mode UEs (such as MTC devices). The extended DRX cycle value will likely be greater than one SFN cycle value, for example 64 times the SFN cycle (64*10.24s = 655.36s). If the current PF/PO determination mechanism is still used, there may be a problem that the PF and PO calculation results will collide, and the UE cannot be woken up only once in each extended DRX cycle, thereby failing to achieve energy saving. purpose.

For example, assume that the preset extended DRX period T = 2048 radio frames = 20.48 s, which is twice the current SFN period. nB is equal to T, then N=T=2048, which means that for each radio frame, there is one subframe with paging, and the subframe mapping table of Table 1 above is known to be the ninth subframe. UE_ID Set to a value from 1-123 because IMSI is modulo 1024.

The PF can then be calculated using SFN mod T = (T/N) x (UE_ID mod N). It can be seen that since the range of SFN is 1-102, which is always smaller than T=2048, SFN mod T does not work, and UE_ID mod N does not work. This means that the UE will wake up once in each SFN period according to the UE_ID value. For example, if the IMSI is set to 1, UE_ID=1, SFN mod T=(T/N)×(UE_ID mod N)=1. This means that for each SFN period in the extended DRX cycle, the UE needs to wake up for each radio frame with SFN=1. Thus for an extended DRX cycle equal to twice the SFN period, the UE wakes up twice in each DRX cycle instead of once.

Obviously, if the extended DRX period is greater than the SFN period, the UE will wake up in each DRX cycle as (DRX cycle / SFN cycle) times. This does not satisfy the energy-saving principle that the UE only wakes up once in each DRX cycle, and is not optimized for the UE idle mode energy saving.

references:

[1] 3GPP TS36.304 v11.2.0 E-UTRA UE procedures in idle mode (Release 11), 2012-12

[2] 3GPP TS36.331 v11.2.0 Radio Resource Control (RRC) Protocol specification (Release 11), 2012-12

[3] 3GPP TR23.887 v0.8.0 Machine-Type and other Mobile Data Applications Communications Enhancements (Release 12), 2013-02

Therefore, in response to the above problems, the present invention provides a scheme for how to support an extended DRX cycle larger than the current SFN cycle length to save UE power.

According to an aspect of the present invention, a method for power saving of an idle mode UE is provided, comprising: configuring an extended DRX cycle, the extended DRX cycle being greater than a regular DRX cycle and greater than an SFN cycle; transmitting the extended DRX cycle to The UE intercepts the paging message with the DRX cycle for the UE to use the extension in idle mode.

According to another aspect of the present invention, an apparatus for power saving of an idle mode UE is provided, comprising: an extended DRX cycle configuration unit configured to configure an extended DRX cycle, the extended DRX cycle being greater than a regular DRX cycle and greater than An SFN period; a transmitting unit configured to transmit the extended DRX cycle to the UE for intercepting the paging message by the UE using the extended DRX cycle in the idle mode.

According to another aspect of the present invention, a method for power saving of an idle mode UE is provided, comprising: acquiring an extended DRX cycle, the extended DRX cycle being greater than a regular DRX cycle and greater than an SFN cycle; determining according to the extended DRX cycle The PF number and PO sub-frame number used to intercept the paging message.

According to another aspect of the present invention, an apparatus for power saving of an idle mode UE is provided, comprising: an extended DRX cycle acquisition unit configured to acquire the extended DRX cycle, the extended DRX cycle being greater than a regular DRX cycle and Greater than system frame number (SFN) period; A unit configured to determine a PF number and a PO subframe number for intercepting the paging message based on the extended DRX cycle.

With the solution of the present invention, the power of the UE can be further saved by supporting the extended DRX cycle.

200‧‧‧ steps

210‧‧‧Steps

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330‧‧‧Steps

400‧‧‧ device

410‧‧‧Extended DRX cycle configuration unit

420‧‧‧Transmission unit

430‧‧‧counting unit

500‧‧‧ device

510‧‧‧Extended DRX cycle acquisition unit

520‧‧‧Determining unit

530‧‧‧ Receiving unit

The invention will be better understood, and the other objects, details, features and advantages of the present invention will become more apparent from the description of the appended claims. In the drawings: FIG. 1 shows a schematic diagram of a wireless communication network in the prior art; FIG. 2 shows a flow chart of a method for energy saving of an idle mode UE according to an embodiment of the present invention; FIG. 3 shows Flowchart of a method for energy saving of an idle mode UE according to an embodiment of the present invention; FIG. 4 is a block diagram showing an apparatus for power saving of an idle mode UE according to an embodiment of the present invention; and FIG. A block diagram of an apparatus for energy saving of an idle mode UE of an embodiment of the present invention.

Throughout the drawings, the same or similar reference numerals have the same or similar features or functions.

Preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. formula. While the preferred embodiment of the present invention has been shown in the drawings, it is understood that Rather, these embodiments are provided so that this disclosure will be thorough and complete.

FIG. 1 shows a schematic diagram of a prior art wireless communication network 100. As shown in FIG. 1, network 100 includes a plurality of base stations 110 and one or more UEs 120 in communication with each base station 110, wherein each UE 120 communicates with its respective serving base station 110 over a wireless link.

In the following description of the present disclosure, the current SFN period is taken as an example, that is, the period value of the SFN period is 1024 (0-1023), which minimizes the influence on the design of existing system performance and other mechanisms. However, it will be apparent to those skilled in the art that the present invention can be adaptively applied to varying SFN cycles without the need for creative labor if the SFN cycle changes in future standards.

2 shows a flow diagram of a method 200 for power saving of an idle mode UE, in accordance with an embodiment of the present invention. Method 200 is performed, for example, by base station 110 in FIG.

The method 200 begins at step 210 with the base station 110 configuring an extended DRX cycle that is greater than a regular DRX cycle and greater than an SFN cycle.

In one embodiment, the extended DRX cycle is set to an integer multiple of the SFN cycle. More preferably, the extended DRX cycle is set to a power of 2 times the SFN cycle, such as 1, 2, 4, 8, of the SFN cycle. 16, 32, 64 times. For example, the extended DRX cycle can be set to 64 times the SFN cycle, ie 655.36 seconds, which is approximately 11 minutes. However, those skilled in the art will appreciate that the principles of the present invention can be applied to any extended DRX cycle that is greater than the SFN period.

Next, in step 220, the base station 110 transmits the extended DRX cycle to the UE (e.g., the UE 120) for the UE to intercept the paging message using the extended DRX cycle in the idle mode.

In one embodiment, the extended DRX cycle is sent to the UE by adding information about the extended DRX cycle to the SystemInformationBlockType2 (SIB2) message. For example, base station 110 can broadcast SIB2 messages containing the extended DRX cycle to a plurality of UEs 120.

In one embodiment, information about the extended DRX cycle is added to the current PCCH-Config cell of SIB2. For example, such modified PCCH-Config cells can be defined as follows:

Wherein RadioResourceConfigCommon Description Parameter field to a value sfnCycle1 defaultExtendLongPagingCycle the description 1024 corresponding to the radio frame, corresponding values sfnCycle2 2048 radio frames, and so on.

FIG. 3 illustrates a flow diagram of a method 300 for power saving of an idle mode UE, in accordance with an embodiment of the present invention. Method 300 is performed, for example, by UE 120 in FIG.

The method 300 begins in step 310 with the UE 120 acquiring an extended DRX cycle that is greater than a regular DRX cycle and greater than an SFN cycle.

In one embodiment, the extended DRX cycle is an integer multiple of the SFN cycle. More preferably, the extended DRX cycle is a power of 2 of the SFN cycle, such as 1, 2, 4, 8, 16, 32, 64 times the SFN cycle. However, those skilled in the art will appreciate that the principles of the present invention can be applied to any extended DRX cycle that is greater than the SFN period.

In one embodiment, the UE 120 acquires the extended DRX cycle by receiving an SIB2 message from the base station 110 and extracting information about the extended DRX cycle therefrom.

In an embodiment, after receiving the SIB2 message broadcasted by the base station 110, the UE with the energy saving requirement, such as the MTC device with the energy saving requirement, may extract the extended DRX cycle ( defaultExtendLongPagingCycle ) from the SIB2 message for use in the connection. In the idle mode DRX mechanism, the preset paging period ( defaultPagingCycle , that is, the regular DRX cycle) is ignored. On the other hand, a normal UE or other type of MTC device may extract a preset paging period ( defaultPagingCycle ) from the SIB2 message for use in the next idle mode DRX mechanism while ignoring the extended DRX cycle ( defaultExtendLongPagingCycle ). In this way, the method of the present invention for supporting extended DRX cycles has less impact on the normal UE periodic mechanism.

Next, in step 320, the UE 120 determines a paging frame (PF) number and a paging occasion (PO) subframe number for intercepting the paging message according to the extended DRX cycle.

The calculation method of PF and PO for the extended DRX cycle is based on the conventional UE's PF/PO calculation method, but with some changes. For example, the same parameters as the PF/PO calculation of the conventional UE are used, but some modifications are made.

In one embodiment, as with the conventional UE, the index i_s pointing to the PO is still determined according to the formula i_s=floor(UE_ID/N) mod Ns and the PO subframe number is determined according to the subframe mapping table of Table 1 above.

The PF calculation method will have some variations to accommodate extended DRX cycles greater than the SFN period. In one embodiment, the PF number is determined by the following three sub-steps: Sub-step 1: Calculating the paging frame index number i_PF in an extended DRX cycle, where i_PF = (T/N) x (UE_ID mod N).

The value range of i_PF is {0...T-1}. Since the extended DRX period T is greater than the SFN period (1024), i_PF is likely to be larger than the maximum SFN (which is 1023).

Sub-step 2: Calculate the SFN period index i_SFN in an extended DRX cycle based on the calculated paging frame index number, where i_SFN=floor(i_PF/1024)+1.

Where i_SFN has a value range of {1...T/1024}, in an extension There are T/1024 SFN cycles in the DRX cycle.

Sub-step 3: Calculate the paging frame radio frame number PF_SFN in the SFN period according to the calculated paging frame index number, where PF_SFN=i_PF mod 1024.

Next, the UE may obtain a PF number consisting of two parts, i_SFN and PF_SFN, which determines which of the SFN periods of the DRX cycle the paging frame is in.

In the above calculation of PO/PF, T is an extended DRX period equal to the UE-specific DRX period value allocated by the higher layer and the preset extended paging period (ie, the extended DRX period) broadcasted in SIB2. The smaller one. If the higher layer does not configure the UE-specific DRX cycle, the preset extended DRX cycle is used.

Where: nB is a value selected from the set (4T, 2T, T, T/2, T/4, T/8, T/16, T/32), N=min(T, nB) means existence The number of radio frames of the PO, Ns=max(1, nB/T) refers to the number of subframes used for paging in a paging frame. (where the SFN period is 1024), which is different from the original UE_ID (IMSI mod 1024). It can be seen that the calculation of UE_ID also varies according to the extended DRX cycle. With this variant, it is possible to ensure that the UE is well distributed throughout the extended DRX cycle.

The following is an example of how PF is calculated. The parameters can be set to: - T = sfnCycle2 = 2048 radio frames = 20.48 seconds; - nB = T / 32 = 64 radio frames; - N = min (T, nB) = min (2048, 64) = 64; - Ns = max (1, nB/T)=max(1,1/32)=1; assuming that the UE's IMSI=2040, its UE_ID=IMSI mod T=2040 mod 2048=2040.

Then according to the above sub-step 1, i_PF=(T/N)×(UE_ID mod N)=(2048/64)×(2000 mod 64)=32×56=1792, according to sub-step 2, its i_SFN=floor(i_PF /1024) +1=floor(1792/1024)+1=2, according to sub-step 3, PF_SFN=i_PF mod 1024=1792 mod 1024=768.

In this example, there are 2 SFN periods in the extended DRX cycle, so for this UE, its paging radio frame is in the second SFN period and its radio frame number is 768.

I_s is i_s=floor(UE_ID/N) mod Ns=floor(2040/64) mod 1=31 mod 1=0. According to the subframe mapping table of Table 1 above, it can be known that the subframe number of the PO is 9.

Finally, it can be concluded that in this example, for the extended DRX cycle and the parameter settings described above, the UE will be the ninth of the 768th radio frame of the second SFN cycle in an extended DRX cycle. Sub-frames to intercept paging messages.

It can be seen that in the above PF and PO calculation for the extended DRX cycle, the SFN cycle index is that the base station and the UE determine the paging radio frame. Important information about the specific location. Therefore, in the mechanism of utilizing the extended DRX cycle, it is also necessary to maintain SFN cycle synchronization between the UE and the base station.

To this end, for the base station side, the method 200 may further include the step 230, the base station (such as the base station 110) counting the SFN period index, and transmitting the counted SFN period index to the UE (such as the UE 120) for the base station and the UE. Synchronization between SFN cycles.

For example, for the first SFN, the base station determines its index as 1, and then continues to count the SFN cycle index. The maximum value of the SFN cycle index is determined by the extended DRX cycle of the community, so the SFN cycle index value is Within the scope. The SFN period index value is periodically counted from 1 to . For different communities, the configured extended DRX cycles may be different, so the maximum value of the SFN cycle index may also be different.

In an embodiment, the base station sends an SFN cycle index to the UE through a MasterInformaitonBlock (MIB) message.

Currently, SFN is transmitted in MIB messages. Therefore, the current SFN cycle index can be indicated in the MIB message broadcast by the base station to the UE. Then, when the UE receives the SFN in the MIB message, it can acquire the accurate SFN cycle index in the extended DRX cycle corresponding to the SFN. The UE can then synchronize the SFN cycle count with the base station.

In an embodiment, the base station may add information about the SFN cycle index to the MIB message. For example, if it is assumed that the extended DRX period is equal to 64 times the SFN period, the MIB message to which the cell SFN period index ( sfnCycleIndex ) is added can be defined as follows:

Wherein in the description is defined in the field sfnCycleIndex MasterInformationBlock 6-bit SFN cycle index value, ranging from 1 to 64, corresponding to the maximum value of the extended DRX cycle sfnCycle64. An all-zero value of 000000 indicates an anomaly in which the community does not support extended DRX cycles. UEs that do not have additional energy savings will ignore this value.

In another embodiment, the base station sends an SFN cycle index to the UE through a SystemInformationBlockType1 (SIB1) message.

As described above, although the current SFN is transmitted in the MIB message, there is a specific correspondence between the periodic transmission of the SIB1 message and the MIB message, and the MIB message is necessarily present in the radio frame in which the SIB1 message exists. The UE needs to obtain the SIB1 message to camp on the community. If the SFN period index is sent by using the SIB1 message, the relationship between the SFN in the MIB message and the SFN period index in the SIB1 message can be easily obtained when the UE receives the MIB message and the SIB1 message. Therefore, it is also a good alternative to send the SFN periodic index through the SIB1 message.

For example, the base station may add a corresponding to the radio frame to the SIB1 message. SFN cycle index.

Considering the flexibility of the SFN periodic index, a constant maxSfnCycleIndex can be defined to represent the maximum SFN period index, which can be adjusted according to actual needs. Obviously, the SFN period index value that can be supported by the SIB1 method is more than the SFN period index value supported by the MIB method because the size of the SIB1 message is less strict.

For example, you can add the following cell to the SystemInformationBlockType1 message: sfnCycleIndex INTEGER(0..maxSfnCycleIndex)OPTIONAL,

If the extended DRX cycle is not required to be supported, the UE can ignore the cell, so it is an optional cell rather than a mandatory cell.

Similarly, in order to maintain SFN period synchronization between the UE and the base station, for the UE side, the method 300 may further include the step 330, the UE (such as the UE 120) receiving the SFN period index counted by the base station from the base station (such as the base station 110). Used for SFN cycle synchronization between the base station and the UE. The manner in which the UE performs SFN cycle synchronization with the base station is as described above in connection with step 230.

4 shows a block diagram of an apparatus 400 for power saving of an idle mode UE, in accordance with an embodiment of the present invention. Apparatus 400 can be implemented in a base station or by a base station.

As shown in FIG. 4, apparatus 400 includes an extended DRX cycle configuration unit 410 that is configured to configure an extended DRX cycle that is greater than a regular DRX cycle and greater than an SFN cycle. Device 400 Also included is a transmitting unit 420 configured to transmit the extended DRX cycle to the UE for the UE to intercept the paging message using the extended DRX cycle in the idle mode.

In an embodiment, the apparatus 400 further includes a counting unit 430 configured to count the SFN period index, and the transmitting unit 420 is further configured to transmit the counted SFN period index to the UE for use by the base station and the UE The SFN cycle is synchronized.

In an embodiment, the transmitting unit 420 sends an SFN cycle index to the UE through the SIB1 message.

In one embodiment, the transmitting unit 420 transmits an SFN cycle index to the UE through the MIB message.

In one embodiment, the extended DRX cycle configuration unit 410 sets the extended DRX cycle to an integer multiple of the SFN cycle.

In one embodiment, the extended DRX cycle configuration unit 410 sets the extended DRX cycle to a power of 2 of the SFN cycle.

In one embodiment, the transmitting unit 420 transmits the extended DRX cycle to the UE by adding information about the extended DRX cycle to the SIB2 message.

FIG. 5 shows a block diagram of an apparatus 500 for power saving of an idle mode UE, in accordance with an embodiment of the present invention. Apparatus 500 can be implemented, for example, in a UE or by a UE.

As shown in FIG. 5, apparatus 500 includes an extended DRX cycle acquisition unit 510 configured to acquire the extended DRX cycle, the extended DRX cycle being greater than a regular DRX cycle and greater than an SFN cycle. Device 500 Also included is a determining unit 520 configured to determine a PF number and a PO subframe number for intercepting the paging message based on the extended DRX cycle.

In an embodiment, the apparatus 500 further includes a receiving unit 530 configured to receive an SFN period index counted by the base station for SFN period synchronization before the base station and the UE.

In one embodiment, the extended DRX cycle is an integer multiple of the SFN cycle.

In one embodiment, the extended DRX cycle is a power of 2 of the SFN cycle.

In one embodiment, the determining unit 520 determines the PF number and the PO subframe number in the manner described above in connection with the method 300.

In an embodiment, the receiving unit 530 is further configured to receive the SIB2 message from the base station, and the extended DRX cycle obtaining unit 510 is further configured to extract information about the extended DRX cycle from the received SIB2 message.

In addition, for community reselection of idle mode UEs, service community measurements are performed once per DRX cycle. Performing service community measurements is not a problem for extended DRX cycles. But for performing neighboring community measurements, it is controlled by the time interval (T-Reselection) used to make community reselection measurements for neighboring communities. The time interval in which the idle mode UE periodically performs community reselection measurement for neighboring communities is preferably greater than one DRX cycle. It is therefore necessary to extend the range of values of T-Reselection in 3GPP TS 36.331 such that its maximum value is greater than the extended DRX cycle.

This paper suggests support for extensions in the Radio Access Network (RAN). The DRX cycle is a scheme to save the power of the UE (such as an MTC device), which considers the compatibility of the old version and does not affect the existing conventional UE. In addition, the use of adjustable parameter settings makes it very flexible and reuses the current signaling process with only limited additions to exchange the necessary information. The proposed scheme has less impact on existing protocol standards and systems, and the use of extended DRX cycles can further achieve the goal of further saving UE power. This will affect the current 3GPP standard of the RRC protocol 3GPP TS 36.331 and the idle mode UE operation definition 3GPP TS 36.304.

As used herein, the term "base station" may refer to a coverage area of a base station and/or a base station or base station subsystem serving the coverage area, depending on the context in which the term is used. In the present disclosure, the term "base station" may be used interchangeably with "community", "Node B", "eNodeB", etc., depending on the context.

The methods disclosed herein are described herein with reference to the drawings. It should be understood, however, that the order of the steps shown in the drawings and described in the specification are only illustrative, and that the method steps and/or actions can be performed in different steps without departing from the scope of the claims. The specific order shown in the drawings and described in the specification is not limited.

In one or more exemplary designs, the functionality described herein can be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored as one or more instructions or code on a computer readable medium or transmitted as one or more instructions or code on a computer readable medium. The computer readable medium includes a computer storage medium and a communication medium, wherein the communication medium includes a computer program that facilitates Any medium that is passed to another place. The storage medium can be any available media that can be accessed by a general purpose or special purpose computer. Such computer readable media may include, for example, without limitation, RAM, ROM, EEPROM, CD-ROM or other optical disk storage device, magnetic disk storage device or other magnetic storage device, or may be used in a general purpose or special purpose computer or general purpose or Any other medium in the form of an instruction or data structure accessible by a dedicated processor to carry or store any desired code module. Also, any connection can be termed a computer readable medium. For example, if the software is transmitted over a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then Coaxial cables, fiber optic cables, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are also included in the definition of the medium.

Universal processor, digital signal processor (DSP), dedicated integrated circuit (ASIC), field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components The various exemplary logic blocks, modules, and circuits described in connection with the present disclosure are implemented or executed in any combination of the functions described herein. A general purpose processor may be a microprocessor, or the processor may be any conventional processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, a combination of one or more microprocessors and a DSP core, or any other such structure.

Those of ordinary skill in the art will also appreciate that in conjunction with the practice of the present application The various illustrative logical blocks, modules, circuits, and algorithm steps described in the examples can be implemented as an electronic hardware, a computer software, or a combination of both. To clearly illustrate this interchangeability between hardware and software, various illustrative components, blocks, modules, circuits, and steps are generally described in terms of their functionality. Whether this function is implemented as a hardware or as a software depends on the particular application and design constraints imposed on the overall system. A person skilled in the art can implement the described functions in a modified manner for each specific application, but such implementation decisions should not be construed as departing from the scope of the invention.

The above description of the disclosure is provided to enable any person skilled in the art to make or use the invention. Various modifications of the present disclosure are obvious to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the spirit and scope of the invention. Thus, the present invention is not intended to be limited to the details and the details of

Claims (17)

A method for power saving of an idle mode user equipment (UE), comprising: configuring an extended discontinuous reception (DRX) period, the extended DRX period being greater than a regular DRX period and greater than a system frame number (SFN) period; The extended DRX cycle is sent to the UE for the UE to intercept the paging message using the extended DRX cycle in idle mode. The method of claim 1, further comprising: counting the SFN period index, and transmitting the counted SFN period index to the UE for SFN period synchronization between the base station and the UE. The method of claim 2, wherein the SFN cycle index is sent to the UE by a SystemInformationBlockType1 (SIB1) message. The method of claim 2, wherein the SFN cycle index is sent to the UE by a MasterInformaitonBlock (MIB) message. The method of claim 1, wherein the extended DRX cycle is set to an integer multiple of an SFN cycle. The method of claim 1, wherein the extended DRX cycle is set to a power of 2 times the SFN cycle. The method of claim 1, wherein the extended DRX cycle is sent to the SystemInformationBlockType2 (SIB2) message by adding information about the extended DRX cycle to UE. The method of claim 1, further comprising: setting a time interval for performing community reselection measurement to the neighboring community to be greater than the extended DRX cycle. An apparatus for power saving of an idle mode user equipment (UE), comprising: an extended discontinuous reception (DRX) period configuration unit configured to configure an extended DRX cycle, the extended DRX cycle being greater than a regular DRX cycle and greater than A system frame number (SFN) period; a transmitting unit configured to transmit the extended DRX cycle to the UE for intercepting the paging message by the UE using the extended DRX cycle in the idle mode. A method for power saving of an idle mode user equipment (UE), comprising: acquiring an extended discontinuous reception (DRX) period, the extended DRX period being greater than a regular DRX period and greater than a system frame number (SFN) period; The extended DRX cycle determines the paging frame (PF) number and paging occasion (PO) subframe number used to intercept the paging message. The method of claim 10, wherein the extended DRX cycle is an integer multiple of an SFN cycle. The method of claim 10, wherein the extended DRX cycle is a power of 2 times the SFN cycle. The method of claim 10, wherein for the case where the period value of the SFN period is 1024, the index i_s directed to the PO is calculated according to the following formula and the PO subframe number is determined according to a predetermined subframe mapping table: i_s =floor(UE_ID/N) mod Ns, where: T is the extended DRX cycle, nB is the slave set (4T, 2T, T, T/2, T/4, T/8, T/16, T/32) A value selected in the middle, N=min(T, nB) refers to the number of radio frames in which PO exists, and Ns=max(1, nB/T) refers to the number of subframes used for paging in a paging frame. The IMSI is the UE's international mobile subscriber identity, given as a decimal integer, floor is the rounding operator, and mod is the modulo operator. The method of claim 10, wherein for the case where the period value of the SFN period is 1024, determining the PF number comprises: calculating a paging frame index number i_PF in an extended DRX cycle, where i_PF=(T/ N) × (UE_ID mod N), the SFN period index i_SFN in an extended DRX cycle is calculated according to the calculated paging frame index number, where i_SFN=floor(i_PF/1024)+1, according to the calculated paging frame index The number of the paging frame radio frame number PF_SFN in the SFN period is calculated, where PF_SFN=i_PF mod 1024, and the PF number is indicated by both the calculated SFN period index i_SFN and the paging frame radio frame number PF_SFN, where: T is Extended DRX cycle, nB is a value selected from the set (4T, 2T, T, T/2, T/4, T/8, T/16, T/32), N=min(T, nB) Refers to the number of radio frames in which POs exist, and Ns=max(1, nB/T) refers to the number of subframes used for paging in a paging frame. The IMSI is the UE's international mobile subscriber identity, given as a decimal integer, floor is the rounding operator, and mod is the modulo operator. The method of claim 10, further comprising: receiving an SFN period index counted by the base station for SFN period synchronization between the base station and the UE. The method of claim 10, wherein the extended DRX cycle is obtained by receiving a SystemInformationBlockType2 (SIB2) message from a base station and extracting information about the extended DRX cycle therefrom. An apparatus for power saving of an idle mode user equipment (UE), comprising: an extended discontinuous reception (DRX) period acquisition unit configured to acquire the extended DRX cycle, the extended DRX cycle being greater than a regular DRX cycle and Greater than the system frame number (SFN) period; A determining unit configured to determine a paging frame (PF) number and a paging occasion (PO) subframe number for intercepting the paging message according to the extended DRX cycle.