CN106658602B

CN106658602B - Method for realizing paging equilibrium distribution under ultra-long DRX

Info

Publication number: CN106658602B
Application number: CN201510736493.XA
Authority: CN
Inventors: 王淑坤; 许瑞峰
Original assignee: Beijing Xinwei Telecom Technology Inc
Current assignee: Beijing Xinwei Telecom Technology Inc
Priority date: 2015-11-02
Filing date: 2015-11-02
Publication date: 2020-04-24
Anticipated expiration: 2035-11-02
Also published as: CN106658602A

Abstract

The invention provides a method for realizing paging equilibrium distribution under an ultra-long DRX (discontinuous reception), which comprises the following steps: and when the paging occasion position is calculated, calculating the offset of a paging window, wherein the offset of the paging window is used for indicating that the first paging occasion position calculated by the paging window in the super-long frame is offset backwards by several cell default paging DRX periods. The invention can uniformly distribute the paging messages of the UE on the H-SFN in the eDRX scene, and avoids the situation that the paging occasions or the calculation positions of the paging windows are concentrated on the first half part of the H-SFN, thereby improving the paging capacity.

Description

Method for realizing paging equilibrium distribution under ultra-long DRX

Technical Field

The invention relates to an LTE technology, in particular to a method for realizing paging balanced distribution under an ultra-long DRX.

Background

With the development of wireless mobile communication technology, people put higher and higher demands on high speed, low delay and low cost. The lte (long Term evolution) project has been generated in such a context, pursuing higher peak rates and shorter transmission delays.

The main performance goals of the LTE project include: the peak rate of 100Mbps downlink and 50Mbps uplink can be provided in the 20MHz frequency spectrum bandwidth, the performance of cell edge users is improved, and the cell capacity is improved; the system delay is reduced, the one-way transmission delay inside the user plane is lower than 5ms, the transition time of the control plane from the sleep state to the active state is lower than 50ms, and the transition time from the residence state to the active state is less than 100 ms; cell coverage of 100Km radius is supported; the method can provide access service of more than 100kbps for 350Km/h high-speed mobile users; supporting paired or unpaired spectrum; supporting variable bandwidth, up to 20M bandwidth.

The LTE adopts a single-layer flat full IP network structure of an access network formed by NodeB on the network architecture, and the structure is favorable for simplifying the network and reducing the delay, thereby realizing the requirements of low time delay, low complexity and low cost. LTE reduces RNC nodes compared to traditional 3GPP access networks. The eNB not only has the functions of the original NodeB, but also can complete most of the functions of the original RNC, including a physical layer, an MAC layer, an RRC, scheduling, access control, bearer control, access mobility management, and the like. Node bs and Node bs are directly interconnected by using a Mesh (Mesh) method, which is also a significant modification of the original UTRAN structure. Approaching the typical IP broadband network architecture.

In physical layer technology, LTE adopts advanced radio transmission technologies such as ofdm (orthogonal Frequency division multiplexing), mimo (Multiple Input Multiple output), and channel-based link adaptive scheduling and interference coordination technologies. Further improving the speed of the user and the throughput of the cell, and improving the performance of the edge of the cell.

With the development of wireless communication technology and the further desire for low latency and high rate, new technologies are introduced at the LTE-a stage, such as carrier aggregation ca (carrier aggregation), Relay technology, coordinated multipoint (comp) and Enhanced Inter-Cell Interference (eICIC) wireless technologies.

UE power saving has been a topic of comparative fire. E.g., psm (power Saving mode), DRX in idle state and DRX in connected state. There is a higher demand for power saving due to certain devices, such as M2M (machine to machine) devices. So the proposal of ultra-long DRX is proposed. The maximum DRX configuration is 2.56s, and is specific to M2M traffic, such as high tolerance to packet transmission and reception delay, packet traffic, and long cycle interval between transmission and reception of traffic. Longer DRX lengths, e.g., on the order of minutes, are required to be designed for further power saving purposes.

In order to introduce longer idle DRX, the concept of a very long frame is introduced, and a schematic diagram of the structure of the very long frame is shown in fig. 1. One SFN period is one H-SFN, and the period of the H-SFN is 1024H-SFN.

In the prior art, the paging occasion is calculated according to the cell DRX, so when the paging occasion is calculated, the H-SFN where the paging occasion is located is firstly determined, and then the paging frame and the paging subframe are calculated according to the prior art. Meanwhile, in order to ensure the reliability of paging, a paging window is defined, and multiple times of paging are sent to the UE in the paging window. Therefore, in the prior art, the paging occasions or the paging window calculation positions of the UEs supporting eDRX are concentrated on the first half of one H-SFN, which causes the paging message load to be increased and affects the paging capacity.

Disclosure of Invention

In order to solve the above problems, the present invention provides a method for implementing balanced paging distribution under an ultra-long DRX, which includes: and when the paging occasion position is calculated, calculating the offset of a paging window, wherein the offset of the paging window is used for indicating that the first paging occasion position calculated by the paging window in the super-long frame is offset backwards by several cell default paging DRX periods.

Further, the paging window offset is determined by the network side or the user equipment side.

Further, when the paging window offset is determined by the UE side, the paging window offset is reported to the MME by the UE, and then is transmitted to the eNB by the MME.

Further, reporting, by the UE, the paging window offset to a mobility management entity MME, and transferring, by the MME, the paging window offset to a base station eNB includes:

the UE sends a TAU/ATTACH REQUEST message to the MME, wherein the message carries an ultra-long DRX period and a paging window offset;

and the MME transmits the ultra-long DRX period and the paging window offset to the eNB through a paging message.

Further, still include:

the eNB calculates the paging time of the UE according to the super-long DRX period, the paging window offset and the cell default paging DRX, and sends a paging message to the UE;

and the UE calculates the paging occasion according to the ultra-long DRX period, the paging window offset and the cell default paging DRX.

Further, the paging window offset is calculated according to the following formula:

wherein shift _ offset is the paging window offset;

the IMSI is an international mobile subscriber identity of the user equipment UE;

the cell DRX cycle is the current cell DRX cycle;

meaning that A is rounded down to the largest integer no greater than A.

The invention can uniformly distribute the paging messages of the UE on the H-SFN in the eDRX scene, and avoids the situation that the paging occasions or the calculation positions of the paging windows are concentrated on the first half part of the H-SFN, thereby improving the paging capacity.

Drawings

FIG. 1 is a diagram of a super-long frame structure in the prior art;

fig. 2 is a flowchart of a paging procedure according to embodiment 2 of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.

One embodiment of the present invention provides a method for implementing balanced paging distribution under an ultra-long DRX, including: and when the paging occasion position is calculated, calculating the offset of a paging window, wherein the offset of the paging window is used for indicating that the first paging occasion position calculated by the paging window in the super-long frame is offset backwards by several cell default paging DRX periods.

In an alternative embodiment, the paging window offset is determined by the network side or the user equipment side.

In an optional embodiment, when the paging window offset is determined by the UE side, the paging window offset is reported to the MME by the UE, and then is transmitted to the eNB by the MME.

In an optional embodiment, reporting, by the UE, the paging window offset to a mobility management entity MME, and transferring, by the MME, the paging window offset to a base station eNB includes:

In an optional embodiment, further comprising:

In an alternative embodiment, the paging window offset is calculated according to the following formula:

wherein shift _ offset is the paging window offset;

the cell DRX cycle is the current cell DRX cycle;

meaning that A is rounded down to the largest integer no greater than A.

The embodiments can uniformly distribute the paging messages of the UE on the H-SFN in the eDRX scene, and avoid the situation that the calculation positions of the paging occasions or the paging windows are concentrated on the first half part of one H-SFN, thereby improving the paging capacity.

Example 1

When calculating the position of the paging occasion, defining the offset of a paging window, which is marked as shift _ offset,

shift _ offset, which indicates that the first paging occasion position calculated within the H-SFN is shifted backward by several cellDRX cycles.

Example 2

The shift _ offset parameter is determined by the UE and reported to the MME in the TAU/ATTACH request cell, and the paging message of the MME on the S1 interface is brought to the eNB, for a specific paging process, see fig. 2.

The eNB sends a system message SIB2 to the UE, wherein the system message SIB2 comprises a default paging DRX;

UE sends TAU/ATTACH REQUEST message to MME, wherein carry over long DRX cycle eDRX cycle and paging window offset shift offset;

the MME sends eDRX cycle and shift offset to the eNB through a paging message on an S1 interface;

the eNB calculates the paging time of the UE according to the eDRX cycle, the shift offset and the default paging DRX, and sends a paging message to the UE;

and the UE calculates the paging occasion according to the eDRX cycle, the shift offset and the default paging DRX.

It can be seen from the above embodiments that the present invention provides a method for calculating the starting position of the paging window in the eDRX scenario. Therefore, the paging messages of UEs are uniformly distributed on the H-SFN, and the paging capacity is improved.

Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A method for realizing paging equilibrium distribution under ultra-long DRX is characterized by comprising the following steps:

when the paging occasion position is calculated, a paging window offset is also calculated, wherein the paging window offset is used for indicating that the first paging occasion position calculated by the paging window in the super-long frame is shifted backwards by several cell default paging DRX periods, and the paging window offset is calculated according to the following formula:

wherein shift _ offset is the paging window offset, IMSI is the international mobile subscriber identity of the UE, cellDRXcycle is the current cell DRX cycle,

represents rounding down A to the maximum integer no greater than A;

the eNB calculates the paging time of the UE according to the cycle of the ultra-long DRX, the paging window offset and the cell default paging DRX, and sends a paging message to the UE;

and the UE calculates the paging occasion according to the cycle of the ultra-long DRX, the offset of the paging window and the default paging DRX of the cell.

2. The method of claim 1, wherein the paging window offset is determined by a network side or a user equipment side.

3. The method of claim 2, wherein when the paging window offset is determined by a UE side, the paging window offset is reported to a mobility management entity MME by the UE, and then is transferred to a base station eNB by the MME.

4. The method of claim 3, wherein the paging window offset is reported by the UE to a Mobility Management Entity (MME) and is then passed by the MME to a base station (eNB) comprising: