CN103997774A

CN103997774A - Method for reducing power consumption of user equipment and user equipment

Info

Publication number: CN103997774A
Application number: CN201410209051.5A
Authority: CN
Inventors: 魏璟鑫
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2014-05-13
Filing date: 2014-05-13
Publication date: 2014-08-20
Anticipated expiration: 2034-05-13
Also published as: CN103997774B

Abstract

The embodiment of the invention provides a method for reducing power consumption of user equipment and the user equipment. The method comprises the steps that when the UE carries out same-frequency neighborhood search, the UE obtains timed deviation marks corresponding to same-frequency frequency points, and whether a plurality of cells corresponding to the same-frequency frequency points are synchronous cells or not is determined according to the time deviation marks; if the cells are synchronous cells, the UE receives signals of the serving cells in preset time in a search period, and a radio frequency working unit of the UE is shut down during the time, except the preset time, in the search period, wherein the preset time is the subframe or an orthogonal frequency division duplex OFDM symbol where a main synchronizing signal and an auxiliary synchronizing signal are located. Due to the fact that only when the UE receives the signals in the search period, is the radio frequency working unit started, and the radio frequency working unit is shut down at other moments, the starting time of the radio frequency working unit of the UE can be shortened, and power consumption of the UE is reduced.

Description

Method for reducing power consumption of user equipment and user equipment

Technical Field

The embodiment of the invention relates to a communication technology, in particular to a method for reducing power consumption of user equipment and the user equipment.

Background

In a Long Term Evolution (LTE) system, a User Equipment (UE) uses a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS) to complete neighbor cell search, where the neighbor cell search includes intra-frequency neighbor cell search and inter-frequency neighbor cell search. Each cell transmits PSS and SSS every period, for example, 5ms, and specifically, in a Frequency Division Duplex (FDD) system, each cell transmits PSS in 0 th and 5 th subframes, and in a Time Division Duplex (TDD) system, each cell transmits PSS in 1 st and 6 th subframes, and each cell transmits SSS in 0 th and 5 th subframes regardless of the FDD system or the TDD system.

In the prior art, the UE needs to receive whole 5ms data when performing neighbor cell search, that is, the UE needs to receive data of at least 5 subframes, where each subframe is 1ms, receiving 5ms data means that a radio frequency operating unit (transceiver) of the UE needs to be turned on for at least 5ms, and the radio frequency operating unit occupies a large proportion in DRX standby power consumption of the UE, thereby increasing the standby power consumption of the UE. In fact, the PSS and SSS signals are only carried in partial subframes, and thus the existing receiving method may cause waste in some scenarios.

Disclosure of Invention

The embodiment of the invention provides a method for reducing power consumption of user equipment and the user equipment, which can reduce the power consumption of the user equipment.

A first aspect of the present invention provides a method for reducing power consumption of a user equipment, comprising

When User Equipment (UE) searches for a same-frequency adjacent cell, the UE acquires a timing deviation mark corresponding to the same-frequency point, and determines whether each cell in a plurality of cells corresponding to the same-frequency point is a synchronous cell or not according to the timing deviation mark, wherein the timing deviation mark is used for indicating that each cell is a synchronous cell or an asynchronous cell;

if the cells are synchronous cells, the UE receives signals in preset time of a service cell in the cells in a search period, the UE closes a radio frequency working unit in the search period except the preset time, and the preset time is a subframe or an Orthogonal Frequency Division Multiplexing (OFDM) symbol where the main synchronous signal and the auxiliary synchronous signal are located.

With reference to the first aspect of the present invention, in a first possible implementation manner of the first aspect of the present invention, when the UE is a frequency division duplex FDD terminal, the primary synchronization signal and the secondary synchronization signal are both included in a subframe No. 0 and a subframe No. 5, and the UE receives a signal within a preset time of the serving cell in a search period, including:

the UE receives signals in any subframe 0 or any subframe 5 of the serving cell in the search period;

or,

and the UE receives signals in specific OFDM symbols of any 0 subframe or any 5 subframe of the serving cell in the search period, wherein the specific OFDM symbols are OFDM symbols where the primary synchronization signal and the secondary synchronization signal are located.

With reference to the first aspect of the present invention, in a second possible implementation manner of the first aspect of the present invention, when the UE is a TDD terminal, the primary synchronization signal is included in a subframe 1 and a subframe 6, the secondary synchronization signal is included in a subframe 0 and a subframe 5, and the UE receives a signal within a preset time of the serving cell in a search period, including:

the UE receives signals in any group of No. 0 subframes and No. 1 subframes of the serving cell in the search period, or the UE receives signals in any group of No. 5 subframes and No. 6 subframes of the serving cell in the search period, wherein the No. 0 subframes and the No. 1 subframes are continuous, and the No. 5 subframes and the No. 6 subframes are continuous;

or,

the UE receives signals in specific OFDM symbols of any group of No. 0 subframes and No. 1 subframes of the serving cell in the search period, or receives signals in specific OFDM symbols of any group of No. 5 subframes and No. 6 subframes of the serving cell in the search period, wherein the specific OFDM symbols are OFDM symbols where the primary synchronization signals and the secondary synchronization signals are located, the No. 0 subframes and the No. 1 subframes are continuous, and the No. 5 subframes and the No. 6 subframes are continuous.

With reference to the first aspect of the present invention and the first and second possible implementation manners of the first aspect, in a third possible implementation manner of the first aspect of the present invention, before the obtaining, by the UE, the timing offset indicator corresponding to the co-frequency point, the method further includes:

and the UE configures the timing deviation indication.

With reference to the third possible implementation manner of the first aspect of the present invention, in a fourth possible implementation manner of the first aspect of the present invention, the configuring, by the UE, the timing offset indicator includes:

and if the UE is a Time Division Duplex (TDD) terminal, the UE configures the timing deviation marks to indicate that each cell is a synchronous cell.

With reference to the third possible implementation manner of the first aspect of the present invention, in a fifth possible implementation manner of the first aspect of the present invention, the configuring, by the UE, the timing offset indicator includes:

and if the UE is a Frequency Division Duplex (FDD) terminal, the UE configures the timing deviation marks to indicate that each cell is an asynchronous cell when the UE initially configures the timing deviation marks.

With reference to the fifth possible implementation manner of the first aspect of the present invention, in a sixth possible implementation manner of the first aspect of the present invention, after the UE initially configures the timing offset indicator, the configuring, by the UE, the timing offset indicator further includes:

when the high-level of the network side equipment configures the UE to only measure the service cell and not to search the adjacent cells with the same frequency, the UE configures the timing deviation mark to indicate that each cell is a synchronous cell;

or, when the UE performs the intra-frequency neighbor cell search, if the timing deviation flag indicates that each cell is an asynchronous cell, and it is determined according to the intra-frequency neighbor cell search result corresponding to the asynchronous cell that the timing deviation of each searched cell is smaller than a timing deviation threshold, the UE configures the timing deviation flag to indicate that each cell is a synchronous cell.

With reference to the sixth possible implementation manner of the first aspect of the present invention, in a seventh possible implementation manner of the first aspect of the present invention, the configuring, by the UE, the timing offset indicator further includes:

and after the UE searches the same-frequency adjacent cells every n times, configuring the timing deviation mark to indicate that each cell is an asynchronous cell, wherein n is a positive integer greater than or equal to 1.

With reference to the first aspect and the first to seventh possible implementation manners of the first aspect, in an eighth possible implementation manner of the first aspect, the signal within the preset time of the serving cell in the multiple cells includes: a primary synchronization signal and a secondary synchronization signal of a serving cell, and primary synchronization signals and secondary synchronization signals of other cells in the plurality of cells.

A second aspect of the present invention provides a method for reducing power consumption of a user equipment, including:

when User Equipment (UE) searches pilot frequency adjacent cells, the UE determines whether a pilot frequency point has a reference cell according to the result of the pilot frequency adjacent cell search;

if the pilot frequency point has a reference cell, the UE acquires a timing deviation mark corresponding to the pilot frequency point, and determines whether each cell in a plurality of cells corresponding to the pilot frequency point is a synchronous cell or not according to the timing deviation mark, wherein the timing deviation mark is used for indicating that each cell is a synchronous cell or an asynchronous cell;

if the cells are synchronous cells, the UE receives signals in preset time of a reference cell in the cells in a search period, the UE closes a radio frequency working unit at time except the preset time in the search period, and the preset time is a subframe or an Orthogonal Frequency Division Multiplexing (OFDM) symbol where the main synchronous signal and the auxiliary synchronous signal are located.

With reference to the second aspect of the present invention, in a first possible implementation manner of the second aspect of the present invention, when the UE is a frequency division duplex FDD terminal, the primary synchronization signal and the secondary synchronization signal are both included in a subframe No. 0 and a subframe No. 5, and the UE receives a signal within a preset time of the reference cell in a search period, including:

the UE receives signals in any subframe 0 or any subframe 5 of the reference cell in a search period;

or,

and the UE receives signals in specific OFDM symbols of any one No. 0 subframe or any one No. 5 subframe of the reference cell in a search period, wherein the specific OFDM symbols are OFDM symbols where the primary synchronization signals and the secondary synchronization signals are located.

With reference to the second aspect of the present invention, in a second possible implementation manner of the second aspect of the present invention, when the UE is a time division duplex TDD terminal, the primary synchronization signal is included in a subframe No. 1 and a subframe No. 6, the secondary synchronization signal is included in a subframe No. 0 and a subframe No. 5, and the UE receives a signal within a preset time of the reference cell in a search period, including:

the UE receives signals in any group of No. 0 subframes and No. 1 subframes of the reference cell in the search period, or receives signals in any group of No. 5 subframes and No. 6 subframes of the reference cell in the search period, wherein the No. 0 subframes and the No. 1 subframes are continuous, and the No. 5 subframes and the No. 6 subframes are continuous;

or,

the UE receives signals in specific OFDM symbols of any group of No. 0 subframes and No. 1 subframes of the reference cell in the search period, or receives signals in specific OFDM symbols of any group of No. 5 subframes and No. 6 subframes of the reference cell in the search period, wherein the specific OFDM symbols are OFDM symbols where the primary synchronization signals and the secondary synchronization signals are located, the No. 0 subframes and the No. 1 subframes are continuous, and the No. 5 subframes and the No. 6 subframes are continuous.

With reference to the second aspect of the present invention and the first and second possible implementation manners of the second aspect, in a third possible implementation manner of the second aspect of the present invention, the determining, by the UE, whether a reference cell exists in an inter-frequency point according to a result of the inter-frequency neighbor cell search includes:

the UE respectively calculates the normalized cross-correlation value of the main synchronous signal corresponding to each cell according to the main synchronous signal of each cell corresponding to the pilot frequency point, and respectively calculates the normalized cross-correlation value of the auxiliary synchronous signal corresponding to each cell according to the auxiliary synchronous signal of each cell corresponding to the pilot frequency point;

the UE judges whether at least one cell to be selected exists in each cell corresponding to the pilot frequency point, the normalized cross-correlation value of the main synchronous signal of each cell to be selected is larger than a preset normalized cross-correlation threshold value of the main synchronous signal, and the normalized cross-correlation value of the auxiliary synchronous signal of each cell to be selected is larger than a preset normalized cross-correlation threshold value of the auxiliary synchronous signal;

if at least one cell to be selected does not exist in each cell corresponding to the pilot frequency point, the UE determines that the pilot frequency point does not have a reference cell;

and if at least one cell to be selected exists in each cell corresponding to the pilot frequency point, the UE determines that the pilot frequency point has a reference cell, and the UE selects one cell from the at least one cell to be selected as the reference cell.

With reference to the third possible implementation manner of the second aspect of the present invention, in a fourth possible implementation manner of the second aspect of the present invention, the selecting, by the UE, one cell from the at least one cell to be selected as the reference cell includes:

the UE selects a cell with the maximum primary synchronization signal normalization value or the maximum secondary synchronization signal normalization value from the at least one cell to be selected as the reference cell;

or, the UE selects a cell with the largest sum of the primary synchronization signal normalization value and the secondary synchronization signal normalization value from the cells to be selected as the reference cell.

With reference to the third and fourth possible implementation manners of the second aspect of the present invention, in a fifth possible implementation manner of the second aspect of the present invention, the calculating, by the UE, normalized cross-correlation values of primary synchronization signals corresponding to each cell according to the primary synchronization signals of each cell corresponding to the pilot frequency points, and calculating normalized cross-correlation values of secondary synchronization signals corresponding to each cell according to the secondary synchronization signals of each cell corresponding to the pilot frequency points, respectively includes:

the UE calculates the normalized cross-correlation value step1Ratio of the main synchronization signal corresponding to each cell according to a formula (1):

<math> <mrow> <mi>Step</mi> <mn>1</mn> <mi>Ratio</mi> <mo>=</mo> <munderover> <mi>Σ</mi> <mrow> <mi>i</mi> <mo>=</mo> <mn>0</mn> </mrow> <mrow> <msub> <mi>N</mi> <mi>R</mi> </msub> <mo>-</mo> <mn>1</mn> </mrow> </munderover> <mfrac> <mrow> <munderover> <mi>Σ</mi> <mrow> <mi>m</mi> <mo>=</mo> <mn>0</mn> </mrow> <mrow> <mi>M</mi> <mo>-</mo> <mn>1</mn> </mrow> </munderover> <msup> <mrow> <mo>|</mo> <munderover> <mi>Σ</mi> <mrow> <mi>n</mi> <mo>=</mo> <mi>mL</mi> </mrow> <mrow> <mi>mL</mi> <mo>+</mo> <mi>L</mi> <mo>-</mo> <mn>1</mn> </mrow> </munderover> <msup> <mi>pss</mi> <mo>*</mo> </msup> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>·</mo> <msubsup> <mi>r</mi> <mi>i</mi> <mi>pss</mi> </msubsup> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>|</mo> </mrow> <mn>2</mn> </msup> </mrow> <mrow> <munderover> <mi>Σ</mi> <mrow> <mi>n</mi> <mo>=</mo> <mn>0</mn> </mrow> <mrow> <mi>N</mi> <mo>-</mo> <mn>1</mn> </mrow> </munderover> <msup> <mrow> <mo>|</mo> <msubsup> <mi>r</mi> <mi>i</mi> <mi>pss</mi> </msubsup> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>|</mo> </mrow> <mn>2</mn> </msup> </mrow> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow> </math>

wherein N is_RI represents an index of the receiving antenna of the UE, and i is 0,1, …, N_R-1，For a cell to be calculatedThe time domain signal corresponding to the primary synchronization signal of the cell to be calculated, pss (N) is a time domain sequence sampled from the time domain signal corresponding to the primary synchronization signal of the cell to be calculated, N is 0,1, …, N-1, N is the length of the time domain sequence, and pss^*(n) is the conjugate of pss (n), L is 64, M is 2;

the UE calculates the normalized cross-correlation value step2Ratio of the secondary synchronization signal corresponding to each cell according to a formula (2):

<math> <mrow> <mi>Step</mi> <mn>2</mn> <mi>Ratio</mi> <mo>=</mo> <munderover> <mi>Σ</mi> <mrow> <mi>i</mi> <mo>=</mo> <mn>0</mn> </mrow> <mrow> <msub> <mi>N</mi> <mi>R</mi> </msub> <mo>-</mo> <mn>1</mn> </mrow> </munderover> <mfrac> <mrow> <munderover> <mi>Σ</mi> <mrow> <mi>m</mi> <mo>=</mo> <mn>0</mn> </mrow> <mrow> <mi>M</mi> <mo>-</mo> <mn>1</mn> </mrow> </munderover> <msup> <mrow> <mo>|</mo> <munderover> <mi>Σ</mi> <mrow> <mi>n</mi> <mo>=</mo> <mi>mL</mi> </mrow> <mrow> <mi>mL</mi> <mo>+</mo> <mi>L</mi> <mo>-</mo> <mn>1</mn> </mrow> </munderover> <msup> <mi>sss</mi> <mo>*</mo> </msup> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>·</mo> <msubsup> <mi>r</mi> <mi>i</mi> <mi>sss</mi> </msubsup> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>|</mo> </mrow> <mn>2</mn> </msup> </mrow> <mrow> <munderover> <mi>Σ</mi> <mrow> <mi>n</mi> <mo>=</mo> <mn>0</mn> </mrow> <mrow> <mi>N</mi> <mo>-</mo> <mn>1</mn> </mrow> </munderover> <msup> <mrow> <mo>|</mo> <msubsup> <mi>r</mi> <mi>i</mi> <mi>sss</mi> </msubsup> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>|</mo> </mrow> <mn>2</mn> </msup> </mrow> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </mrow> </math>

wherein,sss (n) is a sampled time domain sequence of the time domain signal corresponding to the secondary synchronization signal of the cell to be calculated, sss^*(n) isConjugation of (1).

With reference to the second aspect of the present invention and the first to fifth possible implementation manners of the second aspect, in a sixth possible implementation manner of the second aspect of the present invention, before the UE acquires the timing offset indicator corresponding to the pilot frequency point, the method further includes:

and the UE configures the timing deviation indication.

With reference to the sixth possible implementation manner of the second aspect of the present invention, in a seventh possible implementation manner of the second aspect of the present invention, the configuring, by the UE, the timing offset indicator includes:

With reference to the sixth possible implementation manner of the second aspect of the present invention, in an eighth possible implementation manner of the second aspect of the present invention, the configuring, by the UE, the timing offset indicator includes:

With reference to the eighth possible implementation manner of the second aspect of the present invention, in a ninth possible implementation manner of the second aspect of the present invention, after the UE initially configures the timing offset indicator, the configuring, by the UE, the timing offset indicator further includes:

when the UE searches the pilot frequency adjacent cells, if the timing deviation marks indicate that each cell is an asynchronous cell and the timing deviation of each searched cell is judged to be smaller than a timing deviation threshold value according to the pilot frequency adjacent cell searching result corresponding to the asynchronous cell, the UE configures the timing deviation marks to indicate that each cell is a synchronous cell.

With reference to the ninth possible implementation manner of the second aspect of the present invention, in a tenth possible implementation manner of the second aspect of the present invention, the configuring, by the UE, the timing offset indicator further includes:

and after the UE searches the pilot frequency adjacent cells every n times, configuring the timing deviation marks to indicate that each cell is an asynchronous cell, wherein n is a positive integer greater than or equal to 1.

With reference to the second aspect and the first to tenth possible implementation manners of the second aspect, in an eleventh possible implementation manner of the second aspect, the signals in the preset time of the reference cell in the multiple cells include: a primary synchronization signal and a secondary synchronization signal of a reference cell, and a primary synchronization signal and a secondary synchronization signal of other cells in the plurality of cells.

A third aspect of the present invention provides a UE, comprising

An obtaining module, configured to obtain a timing deviation flag corresponding to a common-frequency point when the UE performs a common-frequency neighbor cell search, where the timing deviation flag is used to indicate that each cell is a synchronous cell or an asynchronous cell;

a determining module, configured to determine whether each cell in the multiple cells corresponding to the common-frequency points is a synchronous cell according to the timing deviation indicator;

and the receiving module is used for receiving signals in preset time of a service cell in the plurality of cells in a search period if each cell is a synchronous cell, and closing the radio frequency working unit at the time except the preset time in the search period, wherein the preset time is a subframe or an Orthogonal Frequency Division Multiplexing (OFDM) symbol where the main synchronous signal and the auxiliary synchronous signal are located.

With reference to the third aspect of the present invention, in a first possible implementation manner of the third aspect of the present invention, when the UE is a frequency division duplex FDD terminal, the primary synchronization signal and the secondary synchronization signal are both included in a subframe No. 0 and a subframe No. 5, and the receiving module is specifically configured to:

receiving signals in any subframe 0 or any subframe 5 of the serving cell in the search period;

or,

and receiving signals in specific OFDM symbols of any 0 th subframe or any 5 th subframe of the serving cell in the search period, wherein the specific OFDM symbols are OFDM symbols where the primary synchronization signal and the secondary synchronization signal are located.

With reference to the third aspect of the present invention, in a second possible implementation manner of the third aspect of the present invention, when the UE is a time division duplex TDD terminal, the primary synchronization signal is included in a subframe number 1 and a subframe number 6, the secondary synchronization signal is included in a subframe number 0 and a subframe number 5, and the receiving module is specifically configured to:

receiving signals in any group of 0 subframes and 1 subframes of the serving cell in the search period, or receiving signals in any group of 5 subframes and 6 subframes of the serving cell in the search period, wherein the 0 subframes and the 1 subframes are continuous, and the 5 subframes and the 6 subframes are continuous;

or,

receiving signals in specific OFDM symbols of any group of No. 0 sub-frames and No. 1 sub-frames of the serving cell in the search period, or receiving signals in specific OFDM symbols of any group of No. 5 sub-frames and No. 6 sub-frames of the serving cell in the search period, wherein the specific OFDM symbols are OFDM symbols where the primary synchronization signals and the secondary synchronization signals are located, the No. 0 sub-frames and the No. 1 sub-frames are continuous, and the No. 5 sub-frames and the No. 6 sub-frames are continuous.

With reference to the third aspect and the first and second possible implementation manners of the third aspect, in a third possible implementation manner of the third aspect of the present invention, the UE further includes:

a configuration module configured to configure the timing offset indicator.

With reference to the third possible implementation manner of the third aspect of the present invention, in a fourth possible implementation manner of the third aspect of the present invention, the configuration module is specifically configured to:

and if the UE is a Time Division Duplex (TDD) terminal, configuring the timing deviation mark to indicate each cell as a synchronous cell.

With reference to the third possible implementation manner of the third aspect of the present invention, in a fifth possible implementation manner of the third aspect of the present invention, the configuration module is specifically configured to:

and if the UE is a frequency division duplex FDD terminal, configuring the timing deviation marks to indicate that each cell is an asynchronous cell when the timing deviation marks are initially configured.

With reference to the fifth possible implementation manner of the third aspect of the present invention, in a sixth possible implementation manner of the third aspect of the present invention, after the initial configuration is performed on the timing offset indicator, the configuration module is further configured to:

when the high-level of the network side equipment configures the UE to only measure the service cell and not to search the adjacent cells with the same frequency, configuring the timing deviation mark to indicate that each cell is a synchronous cell;

or when the UE searches for the co-frequency neighboring cells, if the timing deviation flag indicates that each cell is an asynchronous cell, and the UE determines, according to the co-frequency neighboring cell search result corresponding to the asynchronous cell, that the timing deviation of each searched cell is smaller than a timing deviation threshold, configuring the timing deviation flag to indicate that each cell is a synchronous cell.

With reference to the sixth possible implementation manner of the third aspect of the present invention, in a seventh possible implementation manner of the third aspect of the present invention, the configuration module is further configured to:

and after every n times of same-frequency neighbor cell search, configuring the timing deviation mark to indicate that each cell is an asynchronous cell, wherein n is a positive integer greater than or equal to 1.

With reference to the third aspect and the first to seventh possible implementation manners of the third aspect, in an eighth possible implementation manner of the third aspect, the signals within the preset time of the serving cell in the multiple cells include: a primary synchronization signal and a secondary synchronization signal of a serving cell, and primary synchronization signals and secondary synchronization signals of other cells in the plurality of cells.

A fourth aspect of the present invention provides a UE, including:

a first determining module, configured to determine whether a pilot frequency point has a reference cell according to a result of pilot frequency neighbor search when the UE performs pilot frequency neighbor search;

an obtaining module, configured to obtain a timing deviation flag corresponding to the pilot frequency point if the pilot frequency point has a reference cell, where the timing deviation flag is used to indicate that each cell is a synchronous cell or an asynchronous cell;

a second determining module, configured to determine whether each cell in the multiple cells corresponding to the pilot frequency point is a synchronous cell according to the timing deviation indicator;

and the receiving module is used for receiving signals in preset time of a reference cell in the plurality of cells in a search period if each cell is a synchronous cell, and closing the radio frequency working unit at the time except the preset time in the search period, wherein the preset time is a subframe or an Orthogonal Frequency Division Multiplexing (OFDM) symbol where the main synchronous signal and the auxiliary synchronous signal are located.

With reference to the fourth aspect of the present invention, in a first possible implementation manner of the fourth aspect of the present invention, when the UE is a frequency division duplex FDD terminal, the primary synchronization signal and the secondary synchronization signal are both included in the subframe No. 0 and the subframe No. 5, and the receiving module is specifically configured to:

receiving signals in any 0 subframe or any 5 subframe of the reference cell in a search period;

or,

and receiving signals in specific OFDM symbols of any 0 th subframe or any 5 th subframe of the reference cell in a search period, wherein the specific OFDM symbols are OFDM symbols where the primary synchronization signal and the secondary synchronization signal are located.

With reference to the fourth aspect of the present invention, in a second possible implementation manner of the fourth aspect of the present invention, when the UE is a time division duplex TDD terminal, the primary synchronization signal is included in a subframe number 1 and a subframe number 6, the secondary synchronization signal is included in a subframe number 0 and a subframe number 5, and the receiving module is specifically configured to:

receiving signals in any group of subframes No. 0 and No. 1 of the reference cell in the search period, or receiving signals in any group of subframes No. 5 and No. 6 of the reference cell in the search period, wherein the subframes No. 0 and No. 1 are continuous, and the subframes No. 5 and No. 6 are continuous;

or,

receiving signals in specific OFDM symbols of any group of No. 0 sub-frame and No. 1 sub-frame of the reference cell in the search period, or receiving signals in specific OFDM symbols of any group of No. 5 sub-frame and No. 6 sub-frame of the reference cell in the search period, wherein the specific OFDM symbols are OFDM symbols where the primary synchronization signal and the secondary synchronization signal are located, the No. 0 sub-frame and the No. 1 sub-frame are continuous, and the No. 5 sub-frame and the No. 6 sub-frame are continuous.

With reference to the fourth aspect of the present invention and the first and second possible implementation manners of the fourth aspect, in a third possible implementation manner of the fourth aspect of the present invention, the first determining module specifically includes:

the calculating unit is used for calculating the normalized cross-correlation value of the main synchronous signal corresponding to each cell according to the main synchronous signal of each cell corresponding to the pilot frequency point, and calculating the normalized cross-correlation value of the auxiliary synchronous signal corresponding to each cell according to the auxiliary synchronous signal of each cell corresponding to the pilot frequency point;

a determining unit, configured to determine whether at least one cell to be selected exists in each cell corresponding to the pilot frequency point, where a normalized cross-correlation value of a primary synchronization signal of each cell to be selected is greater than a preset normalized cross-correlation threshold value of the primary synchronization signal, and a normalized cross-correlation value of an auxiliary synchronization signal of each cell to be selected is greater than a preset normalized cross-correlation threshold value of the auxiliary synchronization signal;

and the reference cell determining unit is used for determining that the pilot frequency point does not have the reference cell if at least one cell to be selected does not exist in each cell corresponding to the pilot frequency point, determining that the pilot frequency point has the reference cell if at least one cell to be selected exists in each cell corresponding to the pilot frequency point, and selecting one cell from the at least one cell to be selected as the reference cell.

With reference to the third possible implementation manner of the fourth aspect of the present invention, in a fourth possible implementation manner of the fourth aspect of the present invention, the reference cell determining unit is specifically configured to:

selecting a cell with the maximum primary synchronization signal normalization value or the maximum secondary synchronization signal normalization value from the at least one cell to be selected as the reference cell;

or selecting the cell with the maximum sum of the primary synchronization signal normalization value and the secondary synchronization signal normalization value from the cells to be selected as the reference cell.

With reference to the third and fourth possible implementation manners of the fourth aspect of the present invention, in a fifth possible implementation manner of the fourth aspect of the present invention, the calculating unit is specifically configured to:

calculating the normalized cross-correlation value step1Ratio of the primary synchronization signal corresponding to each cell according to a formula (1):

wherein N is_RI represents an index of the receiving antenna of the UE, and i is 0,1, …, N_R-1，For a time domain signal corresponding to a primary synchronization signal of a cell to be calculated, pss (N) is a time domain sequence sampled from the time domain signal corresponding to the primary synchronization signal of the cell to be calculated, N is 0,1, …, N-1, N is the length of the time domain sequence, and pss^*(n) is the conjugate of pss (n), L is 64, M is 2;

calculating the normalized cross-correlation value step2Ratio of the secondary synchronization signal corresponding to each cell according to a formula (2):

With reference to the fourth aspect and the first to fifth possible implementation manners of the fourth aspect, in a sixth possible implementation manner of the fourth aspect of the present invention, the UE further includes:

a configuration module configured to configure the timing offset indicator.

With reference to the sixth possible implementation manner of the fourth aspect of the present invention, in a seventh possible implementation manner of the fourth aspect of the present invention, the configuration module is specifically configured to:

With reference to the sixth possible implementation manner of the fourth aspect of the present invention, in an eighth possible implementation manner of the fourth aspect of the present invention, the configuration module is specifically configured to:

With reference to the eighth possible implementation manner of the fourth aspect of the present invention, in a ninth possible implementation manner of the fourth aspect of the present invention, the configuration module is further configured to:

and when the UE searches the pilot frequency adjacent cells, if the timing deviation marks indicate that each cell is an asynchronous cell and the UE judges that the timing deviation of each searched cell is smaller than a timing deviation threshold value according to the pilot frequency adjacent cell search result corresponding to the asynchronous cell, configuring the timing deviation marks to indicate that each cell is a synchronous cell.

With reference to the ninth possible implementation manner of the fourth aspect of the present invention, in a tenth possible implementation manner of the fourth aspect of the present invention, the configuration module is further configured to:

and after every n times of pilot frequency adjacent cell search, configuring the timing deviation mark to indicate that each cell is an asynchronous cell, wherein n is a positive integer greater than or equal to 1.

With reference to the fourth aspect and the first to tenth possible implementation manners of the fourth aspect, in an eleventh possible implementation manner of the fourth aspect, the signals in the preset time of the reference cell in the multiple cells include: a primary synchronization signal and a secondary synchronization signal of a reference cell, and a primary synchronization signal and a secondary synchronization signal of other cells in the plurality of cells.

According to the method for reducing the power consumption of the user equipment and the user equipment, when the UE determines that each cell corresponding to the same-frequency point is a synchronous cell according to the acquired timing deviation mark, the UE only receives signals within the preset time of a service cell in a search period, and closes a radio frequency working unit at the time except the preset time in the search period, namely the UE only opens the radio frequency working unit when receiving the sub-frame or OFDM symbol where the main synchronous signal and the auxiliary synchronous signal are located, and closes the radio frequency working unit at other time in the search period. However, in the prior art, the UE needs to receive signals in all subframes in the search period, so the UE needs to start the rf working unit in the entire search period. Therefore, compared with the prior art, the method provided by the embodiment of the invention can shorten the starting time of the radio frequency working unit, thereby achieving the purpose of reducing the power consumption of the UE.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a flowchart illustrating a first embodiment of a method for reducing power consumption of a UE according to the present invention;

FIG. 2 is a flowchart illustrating a second embodiment of a method for reducing power consumption of a UE according to the present invention;

fig. 3 is a schematic diagram of an FDD frame structure;

FIG. 4 is a flowchart of a third embodiment of a method for reducing power consumption of a UE according to the present invention;

fig. 5 is a schematic diagram of a TDD frame structure;

FIG. 6 is a flowchart illustrating a fourth method for reducing power consumption of a UE according to the present invention;

FIG. 7 is a flowchart of a fifth embodiment of a method for reducing power consumption of a UE according to the present invention;

FIG. 8 is a flowchart of a sixth embodiment of a method for reducing power consumption of a UE according to the present invention;

fig. 9 is a schematic structural diagram of a UE according to a seventh embodiment of the present invention;

fig. 10 is a schematic structural diagram of a UE according to an eighth embodiment of the present invention;

fig. 11 is a schematic structural diagram of a UE according to a ninth embodiment of the present invention;

fig. 12 is a schematic structural diagram of a UE according to a tenth embodiment of the present invention;

fig. 13 is a schematic structural diagram of a UE according to an eleventh embodiment of the present invention;

fig. 14 is a schematic structural diagram of a UE according to a twelfth embodiment 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, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Fig. 1 is a flowchart of a first embodiment of a method for reducing power consumption of a UE in the present invention, and this embodiment mainly describes how to reduce power consumption of a UE during intra-frequency neighbor cell search, as shown in fig. 1, the method provided in this embodiment may include the following steps:

step 101, when the UE searches the same-frequency adjacent cells, the UE obtains a timing deviation mark corresponding to the same-frequency point, and determines whether each cell in a plurality of cells corresponding to the same-frequency point is a synchronous cell according to the timing deviation mark.

The timing deviation mark is used for indicating that each cell corresponding to the same-frequency point is a synchronous cell or an asynchronous cell, the cell of the same frequency point can be divided into a synchronous (synchronous) cell or an asynchronous (asynchorous) cell according to the magnitude of the transmission timing deviation, each synchronous cell almost simultaneously transmits signals (for example, the transmission time is less than a specific threshold), and the transmission timing deviation of each cell can be very large (for example, the transmission time is greater than or equal to the specific threshold) when the asynchronous cell transmits the signals. For example, 0 and 1 are used to represent the timing deviation indicator, when the value of the timing deviation indicator is 1, each cell is a synchronous cell, and when the value of the timing deviation indicator is 0, each cell is an asynchronous cell.

102. If each cell is a synchronous cell, the UE receives signals in the preset time of a service cell in a plurality of cells in the search period, the UE closes the radio frequency working unit in the search period except the preset time, and the preset time is a subframe or an OFDM symbol where the main synchronous signal and the auxiliary synchronous signal are located.

And the function of receiving signals by the UE is completed by the radio frequency working unit, and the radio frequency working unit is closed when the receiving is not needed. The signals in the preset time of the service cell in the plurality of cells comprise: a primary synchronization signal and a secondary synchronization signal of a serving cell, and primary synchronization signals and secondary synchronization signals of other cells in the plurality of cells.

The UE completes the same-frequency adjacent region search according to the main synchronization signal and the auxiliary synchronization signal, and the main synchronization signal and the auxiliary synchronization signal are only carried in a specific Orthogonal Frequency Division Multiplexing (OFDM) symbol of a part of subframes of an infinite frame, so that the UE can only receive the OFDM symbol or the subframe where the main synchronization signal and the auxiliary synchronization signal are located, and can ensure that the main synchronization signal and the auxiliary synchronization signal of each cell corresponding to the same-frequency point are collected without receiving all signals in a search period. In addition, because the transmission timing deviation between the synchronous cells is very small, that is, each cell corresponding to the same-frequency point transmits the primary synchronization signal and the secondary synchronization signal almost simultaneously, the UE can ensure that the primary synchronization signal and the secondary synchronization signal of each synchronous cell corresponding to the same-frequency point are both received only by receiving the signal within the preset time of the serving cell in the plurality of cells within the search period, the preset time takes the time of the serving cell as a reference, and the preset time is the subframe or OFDM symbol where the primary synchronization signal and the secondary synchronization signal of the serving cell are located.

In this embodiment, when the UE determines that each cell corresponding to the common-frequency point is a synchronous cell according to the obtained timing offset indicator, the UE only receives signals within the preset time of the serving cell in the search period, and closes the radio frequency working unit at a time other than the preset time in the search period, that is, the UE only opens the radio frequency working unit when receiving the subframe or OFDM symbol where the primary synchronization signal and the secondary synchronization signal are located, and closes the radio frequency working unit at other times in the search period. However, in the prior art, the UE needs to receive signals in all subframes in the search period, so the UE needs to start the rf working unit in the entire search period. Therefore, compared with the prior art, the method of the embodiment can shorten the starting time of the radio frequency working unit, thereby achieving the purpose of reducing the power consumption of the UE.

On the basis of the first embodiment, the technical solutions in the first embodiment of the present invention are described in detail, in this embodiment, a UE is an example of a Frequency Division Duplex (FDD) terminal, and when the UE is an FDD terminal, the primary synchronization signal and the secondary synchronization signal are both included in the subframe 0 and the subframe 5. Fig. 2 is a flowchart of a second embodiment of the method for reducing power consumption of a ue in the present invention, as shown in fig. 2, the method provided in this embodiment may include the following steps:

step 201, when the UE searches for the neighboring cells with the same frequency, the UE obtains a timing deviation flag corresponding to the frequency point with the same frequency, and determines whether each cell in a plurality of cells corresponding to the frequency point with the same frequency is a synchronous cell according to the timing deviation flag.

The UE determines whether each cell in the multiple cells corresponding to the co-frequency points is a synchronous cell according to the timing deviation indicator, if so, performs step 202, and if so, performs step 203.

Step 202, the UE receives a signal in any subframe 0 or any subframe 5 of the serving cell in the search period; or, the UE receives a signal in a specific OFDM symbol of any one subframe 0 or any one subframe 5 of the serving cell in the search period, where the specific OFDM symbol is an OFDM symbol in which the primary synchronization signal and the secondary synchronization signal are located.

When each cell corresponding to the same frequency point is a synchronization cell, the step is performed, in this embodiment, the UE is an FDD terminal, and the primary synchronization signal and the secondary synchronization signal are both contained in the subframe No. 0 and the subframe No. 5. Therefore, the UE only receives signals in any subframe 0 or any subframe 5 of the serving cell in the search period, or the UE only receives signals in a specific OFDM symbol of any subframe 0 or any subframe 5 of the serving cell in the search period, and turns off the rf working unit when the UE does not receive other signals in the search period. And the UE extracts the primary synchronization signal and the secondary synchronization signal of each cell from the received signals to complete the search of the adjacent cells with the same frequency.

Specifically, if the serving cell sends a subframe 0 in the search period, the UE only receives the signal in the subframe 0 or the signal in the specific OFDM symbol of the subframe 0; if the serving cell only sends a subframe No. 5 in the search period, the UE only receives signals in the subframe No. 5 or signals in a specific OFDM symbol of the subframe No. 5; if the serving cell sends at least one subframe 0 and at least one subframe 5 in the search period, the UE may receive a signal in any subframe 0 or any subframe 5 of the serving cell in the search period, or the UE may receive a signal in a specific OFDM symbol of any subframe 0 or any subframe 5 of the serving cell in the search period. Of course, the UE may also receive signals in all subframes No. 0 and/or all subframes No. 5 of the serving cell during the search period, or the UE may receive only signals in specific OFDM symbols of all subframes No. 0 and/or all subframes No. 5 of the serving cell during the search period. In a possible implementation manner, the UE may receive signals in a partial subframe No. 0 and/or a partial subframe No. 5 of the serving cell in the search period, or the UE may receive only signals in a specific OFDM symbol of the partial subframe No. 0 and/or the partial subframe No. 5 of the serving cell in the search period, which is not limited in each embodiment of the present invention.

It should be noted that, in the embodiments of the present invention, a subframe is received, that is, a signal carried on the subframe is received. A cell performs transmission or signal transmission, that is, a base station corresponding to the cell performs transmission or signal transmission on the cell.

Taking the example that the UE starts the intra-frequency search in a Discontinuous Reception (DRX) cycle, assume that the UE starts 1 round of intra-frequency neighboring cell search every N DRX cycles, the intra-frequency neighboring cell search uses M data within 5 milliseconds (ms), i.e. the search cycle is 5Mms, and M is a positive integer. If the UE is an FDD terminal, the UE only receives the subframe 0 and/or the subframe 5 sent by the serving cell within 5Mms, optionally, the UE receives all the subframes 0 and/or the subframes 5 within 5Mms, or the UE receives part of the subframes 0 and/or the subframes 5 within 5Mms, and in a preferred mode, the UE only receives any one of the subframes 0 or the subframes 5 within 5 Mms.

In the above manner, the UE only receives the subframes where the primary synchronization signal and the secondary synchronization signal are located, while in another manner, the UE may only receive the OFDM symbols where the primary synchronization signal and the secondary synchronization signal are located. When the UE is an FDD terminal, the UE receives a specific OFDM symbol of any 0 th subframe or any 5 th subframe sent by the serving cell in the search period, where the specific OFDM symbol is an OFDM symbol in which the primary synchronization signal and the secondary synchronization signal are located. Referring to fig. 3, fig. 3 is a schematic diagram of an FDD frame structure, in an FDD frame, one radio frame includes 10 subframes, the numbers of which are respectively 0 to 9, each subframe includes two slots, each slot includes 6 or 7 OFDM symbols, an auxiliary synchronization signal is included in the second last OFDM symbol of the first slot of the subframe No. 0 and the subframe No. 5, a main synchronization signal is included in the last OFDM symbol of the first slot of the subframe No. 0 and the subframe No. 5, and in the same subframe, the OFDM symbols where the main synchronization signal and the auxiliary synchronization signal are located are adjacent. The UE can only receive the last two OFDM symbols of the first time slot of any one No. 0 subframe or any one No. 5 subframe within 5Mms, correspondingly, the radio frequency working unit of the UE only needs to be started within the last two OFDM symbols of the first time slot of the No. 0 subframe and the No. 5 subframe and is closed at other moments, and therefore power consumption of the radio frequency working unit is reduced.

Step 203, the UE receives signals in all subframes in the search period.

And when each cell corresponding to the same-frequency point is an asynchronous cell, the UE receives signals in all subframes in the search period, extracts the main synchronous signal and the auxiliary synchronous signal of each cell from the received signals and completes the search of the same-frequency adjacent cells.

In this embodiment, when the UE is an FDD terminal, the UE only receives a signal in any subframe 0 or any subframe 5 of the serving cell in the search period, or the UE only receives a signal in a specific OFDM symbol of any subframe 0 or any subframe 5 of the serving cell in the search period, and turns off the radio frequency operating unit when the UE does not receive other signals in the search period and does not receive the signal. Because the radio frequency working unit is started only when the UE receives the signal and is closed at other moments, the method of the embodiment can shorten the starting time of the radio frequency working unit of the UE, thereby reducing the power consumption of the UE.

On the basis of the first embodiment and the second embodiment, before the UE acquires the timing offset indicator corresponding to the co-frequency point, the method further includes: the UE configures the timing deviation indication by itself. If the UE is an FDD terminal, the UE configuration timing offset flag specifically is: when the UE initially configures the timing deviation marks, the timing deviation marks are configured to indicate that each cell is an asynchronous cell. After the UE initially configures the timing offset indicator, the timing offset indicator is updated under the following conditions: (1) when the high-level configuration UE of the network side equipment only carries out the measurement of the service cell and does not carry out the search of the adjacent cells with the same frequency, the UE configures the timing deviation mark to indicate that each cell is a synchronous cell. (2) When UE searches the same-frequency neighbor cells, if the timing deviation marks indicate that each cell is an asynchronous cell, the UE judges whether the timing deviation of each searched cell is smaller than a timing deviation threshold preset by the UE according to the same-frequency neighbor cell search result corresponding to the asynchronous cell, and if the timing deviation of each cell searched by the UE is smaller than the timing deviation threshold, the UE configures the timing deviation marks to indicate that each cell is a synchronous cell.

Optionally, the configuring, by the UE, the timing offset indicator further includes: after the UE searches the same-frequency adjacent cells every n times, configuring a timing deviation mark to indicate that each cell is an asynchronous cell, wherein n is a positive integer greater than or equal to 1. The reason why the timing deviation indicator is configured to indicate that each cell is an asynchronous cell after each n-time search is to ensure that once a new asynchronous cell appears, the UE can quickly search the asynchronous cell. Specifically, if a new asynchronous cell occurs but the td indicator is configured to indicate that each cell is a synchronous cell, the UE only receives signals within the preset time of the serving cell and does not receive signals outside the preset time during the search period, and thus the UE cannot timely find the inter-frequency neighbor cell. According to the scheme of the embodiment, after n times of co-frequency neighbor cell search, the timing deviation marks are configured to indicate that each cell is an asynchronous cell, so that the UE can receive data sent by all cells in a search period, and a newly added inter-frequency neighbor cell can be found in time.

On the basis of the first embodiment, the third embodiment of the present invention describes the technical solution in the first embodiment in detail, in this embodiment, the UE is taken as a Time Division Duplex (TDD) terminal for example, when the UE is a TDD terminal, the primary synchronization signal is included in the subframe 1 and the subframe 6, and the secondary synchronization signal is included in the subframe 0 and the subframe 5. Fig. 4 is a flowchart of a third embodiment of a method for reducing power consumption of a user equipment in the present invention, as shown in fig. 4, the method provided in this embodiment may include the following steps:

301, when the UE searches for the neighboring cells with the same frequency, the UE obtains a timing deviation flag corresponding to the frequency point with the same frequency, and determines whether each of a plurality of cells corresponding to the frequency point with the same frequency is a synchronization cell according to the timing deviation flag.

And the UE judges whether each cell in a plurality of cells corresponding to the same-frequency points is a synchronous cell or not according to the timing deviation mark, if so, the step 302 is executed, and if not, the step 303 is executed.

Step 302, the UE receives signals in any group of subframes No. 0 and No. 1 of the serving cell (i.e. any combination formed by subframes No. 0 and subframes No. 1) in a search period, or receives signals in any group of subframes No. 5 and No. 6 of the serving cell (i.e. any combination formed by subframes No. 5 and No. 6) in the search period; or, the UE receives signals in specific OFDM symbols of any group of subframes 0 and 1 of the serving cell in the search period, or the UE receives signals in specific OFDM symbols of any group of subframes 5 and 6 of the serving cell in the search period, where the specific OFDM symbols are OFDM symbols in which the primary synchronization signal and the secondary synchronization signal are located, the subframes 0 and 1 are consecutive, and the subframes 5 and 6 are consecutive.

In one case, if the serving cell only sends a set of subframes No. 0 and 1 in the search period, and the subframes No. 0 and 1 are consecutive, the UE only receives signals in the consecutive subframes No. 0 and 1 of the serving cell in the search period; if the serving cell only sends the subframe No. 5 and the subframe No. 6 in the search period, and the subframe No. 5 and the subframe No. 6 are continuous, the UE only receives signals in the continuous subframe No. 5 and the subframe No. 6 of the serving cell in the search period; if the serving cell sends at least one set of subframe No. 0 and subframe No. 1 and at least one set of subframe No. 5 and subframe No. 6 in the search period, and the subframe No. 0 and the subframe No. 1 are consecutive and the subframe No. 5 and the subframe No. 6 are consecutive, preferably, the UE may receive signals in any set of subframe No. 0 and subframe No. 1 of the serving cell in the search period, or the UE receives signals in any set of subframe No. 5 and subframe No. 6 of the serving cell in the search period. Of course, the UE may also receive signals in all consecutive subframes 0 and 1 of the serving cell and/or signals in all consecutive subframes 5 and 6 during the search period; or, the UE receives signals in partial consecutive subframes 0 and 1 of the serving cell and/or signals in partial consecutive subframes 5 and 6 in the search period, which is not limited in each embodiment of the present invention, but the UE does not receive signals in separate subframes 0,1, 5, and 6.

In the above case, the UE only receives signals in subframes where the primary synchronization signal and the secondary synchronization signal of the serving cell are located in the search period, and in another case, the UE may only receive signals in specific OFDM symbols where the primary synchronization signal and the secondary synchronization signal are located in the search period. Referring to fig. 5, fig. 5 is a schematic diagram of a TDD frame structure, in a TDD frame, a secondary synchronization signal is included in the last OFDM symbol of the subframe No. 0 and the subframe No. 5, a primary synchronization signal is included in the third OFDM symbol of the subframe No. 1 and the subframe No. 6, and taking the search period still as 5Mms as an example, a UE may receive only signals in the last OFDM symbol of the subframe No. 0 and the third OFDM symbol of the subframe No. 1 of a serving cell within 5Mms, or the UE may receive only signals in the last OFDM symbol of the subframe No. 5 and the third OFDM symbol of the subframe No. 6 of the serving cell within 5 Mms. Correspondingly, the radio frequency working unit of the UE only needs to be turned on in the last OFDM symbol of the subframe No. 0 and the third OFDM symbol of the subframe No. 1 of the serving cell, or turned on in the last OFDM symbol of the subframe No. 5 and the third OFDM symbol of the subframe No. 6, and turned off at other times in the search period, thereby reducing the power consumption of the radio frequency working unit. In addition, it should be noted that although the transmission timings of the synchronization cells are almost the same, since paths through which the UE receives the transmission signals of the respective cells may be different, the UE may need to additionally receive signals of a certain sampling point to ensure that the complete primary synchronization signal and the complete secondary synchronization signal can be received, for example, the UE needs to receive signals of L sampling points after the third OFDM symbols of the subframe No. 1 and the subframe No. 6, a value of L is related to inter-cell propagation delay, and L may be preset by the UE.

Step 303, the UE receives signals in all subframes in the search period.

In this embodiment, when the UE is a TDD terminal, the UE receives signals in any group of subframes 0 and 1 of the serving cell, or receives signals in any group of subframes 5 and 6 of the serving cell in the search period; or, the UE receives signals in a specific OFDM symbol of any set of subframe No. 0 and subframe No. 1 of the serving cell during the search period, or the UE receives signals in a specific OFDM symbol of any set of subframe No. 5 and subframe No. 6 of the serving cell during the search period. Because the radio frequency working unit is started only when the UE receives the signal and is closed at other moments, the method of the embodiment can shorten the starting time of the radio frequency working unit of the UE, thereby reducing the power consumption of the UE.

On the basis of the first and third embodiments, before the UE acquires the timing offset indicator corresponding to the co-frequency point, the method further includes: the UE configures the timing deviation indication by itself. If the UE is a TDD terminal, the UE configures a timing deviation mark to indicate each cell as a synchronous cell.

Optionally, the configuring, by the UE, the timing offset indicator further includes: after the UE searches the same-frequency adjacent cells every n times, configuring a timing deviation mark to indicate that each cell is an asynchronous cell, wherein n is a positive integer greater than or equal to 1.

Fig. 6 is a flowchart of a fourth embodiment of the method for reducing power consumption of a UE in the present invention, where the difference between this embodiment and the first to third embodiments is mainly to explain how to reduce power consumption of a UE during inter-frequency neighbor cell search, as shown in fig. 6, the method provided in this embodiment may include the following steps:

step 401, when the UE performs pilot frequency neighbor cell search, the UE determines whether the pilot frequency point has a reference cell according to the pilot frequency neighbor cell search result.

Different frequency has the concept of the service cell unlike the same frequency, therefore, the embodiments of the present invention introduce the concept of the "reference cell" in the different frequency neighbor cell search to replace the service cell in the same frequency neighbor cell search. When there are multiple pilot frequency points, each pilot frequency point corresponds to a reference cell, and the UE needs to sequentially determine whether each pilot frequency point has a reference cell. The pilot frequency point may have a plurality of cells, the UE selects one cell from the plurality of cells corresponding to the pilot frequency point as a reference cell, and the UE may select the reference cell according to a preset rule.

The specific steps of the UE determining whether the pilot frequency point has the reference cell according to the pilot frequency neighbor searching result are as follows:

firstly, the UE needs to acquire the primary synchronization signal and the secondary synchronization signal of each cell corresponding to the pilot frequency point, respectively calculate the normalized cross-correlation value of the primary synchronization signal corresponding to each cell according to the primary synchronization signal of each cell corresponding to the pilot frequency point, and respectively calculate the normalized cross-correlation value of the secondary synchronization signal corresponding to each cell according to the secondary synchronization signal of each cell corresponding to the pilot frequency point. It should be noted that, when the UE performs the pilot frequency neighboring cell search for the first time, the UE needs to receive signals in all subframes in the search period, and then obtains the primary synchronization signal and the secondary synchronization signal of each cell from the received signals, and only when the UE determines that the pilot frequency point has the reference cell according to the search result of the primary pilot frequency neighboring cell, and each cell corresponding to the pilot frequency point is the synchronization cell, the UE can use the scheme of this embodiment, that is, only receives the signal in the preset time of the reference cell in the search period.

After the normalized cross-correlation value of the primary synchronization signal and the normalized cross-correlation value of the secondary synchronization signal corresponding to each cell are obtained through calculation, the UE judges whether a cell to be selected exists in each cell corresponding to the pilot frequency point, the normalized cross-correlation value of the primary synchronization signal of the cell to be selected is larger than a preset normalized cross-correlation threshold value of the primary synchronization signal, and the normalized cross-correlation value of the secondary synchronization signal of the cell to be selected is larger than a preset normalized cross-correlation threshold value of the secondary synchronization signal. In a pilot frequency adjacent cell search, a plurality of cells may be searched for a certain pilot frequency point, but the UE can only select 1 cell from the cells as a reference cell.

And if the cell to be selected does not exist in each cell corresponding to the pilot frequency point, the UE determines that the pilot frequency point does not have a reference cell. If a cell to be selected exists in each cell corresponding to the pilot frequency point, the UE determines that the pilot frequency point has a reference cell, the UE selects one cell from the cells to be selected as the reference cell, optionally, the UE selects a cell with the maximum main synchronization signal normalization value and the maximum auxiliary synchronization signal normalization value from the cells to be selected as the reference cell, or the UE selects a cell with the maximum sum of the main synchronization signal normalization value and the auxiliary synchronization signal normalization value from the cells to be selected as the reference cell.

The UE respectively calculates the normalized cross-correlation value of the main synchronous signal corresponding to each cell according to the main synchronous signal of each cell corresponding to the pilot frequency point, and respectively calculates the normalized cross-correlation value of the auxiliary synchronous signal corresponding to each cell according to the auxiliary synchronous signal of each cell corresponding to the pilot frequency point, specifically:

the UE calculates the normalized cross-correlation value step1Ratio of the main synchronization signal corresponding to each cell according to the formula (1):

wherein N is_RI represents the index of the receiving antenna of the UE, i is 0,1 …, N_R-1，For the time domain signal corresponding to the primary synchronization signal of the cell to be calculated, pss (N) is the time domain sequence sampled from the time domain signal corresponding to the primary synchronization signal of the cell to be calculated, N is 0,1, …, N-1, N is the length of the time domain sequence, N is 128, pss^*(n) is the conjugate of pss (n), L is 64, and M is 2.

The UE calculates the normalized cross-correlation value step2Ratio of the auxiliary synchronization signal corresponding to each cell according to the formula (2):

wherein N is_RI represents the index of the receiving antenna of the UE, i is 0,1 …, N_R-1，For the time domain signal corresponding to the secondary synchronization signal of the cell to be calculated, sss (N) is the time domain sequence sampled from the time domain signal corresponding to the secondary synchronization signal of the cell to be calculated, N is 0,1, …, N-1, N is the length of the time domain sequence, N is 128, sss^*(n) isL-64 and M-2.

In the pilot frequency adjacent cell search of a certain time, a plurality of cells can be searched for a certain pilot frequency point, and 1 cell is selected as a reference cell. This requires that the priority of each cell be determined, or that the cells be ranked, with the highest priority (or top ranked) cell being the reference cell. Firstly, selecting a Step1Ratio > Step1Ratio _ basecell, and a Step2Ratio > Step2Ratio _ basecell cell as a cell to be selected, and then selecting a cell with the highest priority from the cells to be selected as a reference cell, wherein the Step1Ratio _ basecell is a preset main synchronous signal normalized cross-correlation threshold value, and the Step2Ratio _ basecell is a preset auxiliary synchronous signal normalized cross-correlation threshold value. In one implementation of this embodiment, it is preferable that the larger Step2Ratio is, the higher the priority of the cell selected the larger Step1Ratio is, when the priorities of the two cells A, B are compared, if the Step2Ratio of a is greater than the Step2Ratio of B, the priority of a is higher than B; if the Step2Ratio of A is equal to the Step2Ratio of B, then comparing the Step1 ratios, if the Step1Ratio of A is greater than the Step1Ratio of B, the priority of A is higher than that of B, and if the Step1Ratio of A is equal to the Step1Ratio of B, A and B have the same priority. In another implementation manner of this embodiment, the larger the sum of Step2Ratio and Step1Ratio is, the higher the priority of the cell is, which only exemplifies two manners, and certainly, the priority of each cell may also be determined by other manners. When there are a plurality of cells with the highest priority, one cell may be selected as the reference cell.

In this embodiment, after selecting a reference cell for a certain pilot frequency point, the reference cell needs to be updated under the following conditions: (1) and if the N1 times of succession of a certain cell has higher priority than the current reference cell, and the Step1Ratio of the cell is greater than the Step1Ratio _ basecell, and the Step2Ratio is greater than the Step2Ratio _ basecell, updating the reference cell to the cell.

Step 402, if the pilot frequency point has a reference cell, the UE obtains a timing deviation flag corresponding to the pilot frequency point, and determines whether each cell in a plurality of cells corresponding to the pilot frequency point is a synchronization cell according to the timing deviation flag.

And the timing deviation mark is used for indicating that each cell in the plurality of cells corresponding to the pilot frequency point is a synchronous cell or an asynchronous cell.

Step 403, if each cell is a synchronization cell, the UE receives a signal within a preset time of a reference cell in the multiple cells in a search period, and the UE turns off the radio frequency working unit at a time other than the preset time in the search period, where the preset time is a subframe or an OFDM symbol where the primary synchronization signal and the secondary synchronization signal are located.

The specific implementation manner of this embodiment may refer to the description in step 102 in the first embodiment, and details are not repeated here, and this step is different from step 102 in that in this step, the UE receives a signal within the preset time of the reference cell in the search period, and in step 102, the UE receives a signal within the preset time of the serving cell in the search period. The signals in the preset time of the reference cell in the plurality of cells comprise: a primary synchronization signal and a secondary synchronization signal of a reference cell, and primary synchronization signals and secondary synchronization signals of other cells in the plurality of cells.

In this embodiment, when searching for a pilot frequency neighboring cell, the UE selects a reference cell for each pilot frequency point, and then determines whether each cell corresponding to the pilot frequency point is a synchronization cell, if each cell corresponding to the pilot frequency point is a synchronization cell, the UE only receives a signal within a preset time of the reference cell in a search period, and closes the radio frequency working unit at a time outside the preset time in the search period, that is, the UE only opens the radio frequency working unit when receiving a subframe or an OFDM symbol where a main synchronization signal and an auxiliary synchronization signal are located, and closes the radio frequency working unit at other times in the search period. However, in the prior art, the UE needs to receive all subframes in the search period, so the UE needs to start the rf working unit in the entire search period. Therefore, compared with the prior art, the method of the embodiment can shorten the starting time of the radio frequency working unit, thereby achieving the purpose of reducing the power consumption of the UE.

Fig. 7 is a flowchart of a fifth embodiment of a method for reducing power consumption of a user equipment in the present invention, where this embodiment further describes the fourth embodiment, and in this embodiment, a UE is taken as an example to explain, and when the UE is an FDD terminal, as shown in fig. 7, the method provided in this embodiment includes the following steps:

step 501, when the UE searches for the pilot frequency neighboring cell, the UE determines whether the pilot frequency point has a reference cell according to the result of the pilot frequency neighboring cell search.

The specific implementation manner of this step may refer to the description of step 401 in the fourth embodiment, which is not described herein again, and if the pilot frequency point has the reference cell, step 502 is executed, and if the pilot frequency point does not have the reference cell, step 503 is executed.

Step 502, the UE obtains a timing deviation indication corresponding to the pilot frequency point, and determines whether each cell in a plurality of cells corresponding to the pilot frequency point is a synchronization cell according to the timing deviation indication.

If the determination result in this step is yes, step 504 is executed, and if the determination result in this step is no, step 503 is executed.

503. The UE receives signals within all subframes during the search period.

If the pilot frequency point does not have a reference cell or each cell corresponding to the pilot frequency point is an asynchronous cell, the step is executed, the UE receives signals in all subframes in the search period, and extracts the main synchronous signal and the auxiliary synchronous signal of each cell from the received signals to complete the pilot frequency adjacent cell search.

504. The UE receives signals in any subframe 0 or any subframe 5 of the reference cell in a search period; or, the UE receives, in the search period, a signal in a specific OFDM symbol of any one subframe 0 or any one subframe 5 of the reference cell, where the specific OFDM symbol is an OFDM symbol in which the primary synchronization signal and the secondary synchronization signal are located.

The specific implementation manner of this step may refer to the description of step 202 in embodiment two, which is not described herein again, and the difference between this step and step 202 is: the signal is received with reference to the time of the reference cell in this step, and the signal is received with reference to the time of the serving cell in step 202.

In this embodiment, when the UE is an FDD terminal, if the UE has a reference cell and each cell corresponding to the pilot frequency point is a synchronous cell, the UE only receives a signal in any 0 subframe or any 5 subframe of the reference cell in a search period, or the UE only receives a signal in a specific OFDM symbol of any 0 subframe or any 5 subframe of the reference cell in the search period, and turns off the radio frequency operating unit when the UE does not receive other signals in the search period and does not receive the signal. Because the radio frequency working unit is started only when the UE receives the signal and is closed at other moments, the method of the embodiment can shorten the starting time of the radio frequency working unit of the UE, thereby reducing the power consumption of the UE.

On the basis of the fourth embodiment and the fifth embodiment, before the UE acquires the timing offset indicator corresponding to the pilot frequency point, the method further includes: the UE configures the timing deviation indication by itself. If the UE is an FDD terminal, the UE configures a timing offset indicator, specifically: the UE configures the timing offset indicator to indicate each cell as a synchronization cell. After the UE initially configures the timing offset indicator, the UE updates the timing offset indicator under the following conditions: when UE searches for pilot frequency adjacent cells, if the timing deviation marks indicate that each cell is an asynchronous cell, the UE judges whether the timing deviation of each searched cell is smaller than a timing deviation threshold preset by the UE according to a pilot frequency adjacent cell searching result corresponding to the asynchronous cell, and if the timing deviation of each cell searched by the UE is smaller than the timing deviation threshold, the UE configures the timing deviation marks to indicate that each cell is a synchronous cell.

In order to ensure that the UE can quickly search a new asynchronous cell when the new asynchronous cell occurs, in this embodiment, after the UE searches for the different-frequency neighboring cell every n times, the UE configures a timing offset to indicate that each cell is an asynchronous cell, where n is a positive integer greater than or equal to 1.

Fig. 8 is a flowchart of a sixth embodiment of a method for reducing power consumption of a UE according to the present invention, where this embodiment further describes the fourth embodiment, and in this embodiment, a UE is taken as a TDD terminal for example, and when the UE is a TDD terminal, as shown in fig. 8, the method provided in this embodiment includes the following steps:

step 601, when the UE searches for the pilot frequency neighboring cell, the UE determines whether the pilot frequency point has a reference cell according to the result of the pilot frequency neighboring cell search.

The specific implementation manner of this step may refer to the description of step 401 in the fourth embodiment, which is not described herein again, and if the pilot frequency point has the reference cell, step 602 is executed, and if the pilot frequency point does not have the reference cell, step 603 is executed.

Step 602, the UE obtains a timing deviation flag corresponding to the pilot frequency point, and determines whether each of a plurality of cells corresponding to the pilot frequency point is a synchronization cell according to the timing deviation flag.

If the determination result in this step is yes, go to step 604, and if the determination result in this step is no, go to step 603.

603. The UE receives signals within all subframes during the search period.

604. The method comprises the steps that the UE receives signals in any group of No. 0 subframes and No. 1 subframes of a reference cell in a search period, or the UE receives signals in any group of No. 5 subframes and No. 6 subframes of the reference cell in the search period; or the UE receives signals in specific OFDM symbols of any group of subframes 0 and 1 of the reference cell in the search period, or the UE receives signals in specific OFDM symbols of any group of subframes 5 and 6 of the reference cell in the search period, where the specific OFDM symbols are OFDM symbols in which the primary synchronization signal and the secondary synchronization signal are located, the subframes 0 and 1 are consecutive, and the subframes 5 and 6 are consecutive.

The specific implementation of this step may refer to the description of step 302 in the implementation of step three, which is not described herein again, and the difference between this step and step 302 is: the step receives signals with reference to the time of the reference cell, and the step 302 receives signals with reference to the time of the serving cell.

In this embodiment, when the UE is a TDD terminal, the UE receives signals in any group of subframes 0 and 1 of the reference cell in a search period, or receives signals in any group of subframes 5 and 6 of the reference cell; or, the UE receives signals in specific OFDM symbols of any one set of subframe No. 0 and subframe No. 1 of the reference cell, or receives signals in specific OFDM symbols of any one set of subframe No. 5 and subframe No. 6 of the reference cell in the search period. Because the radio frequency working unit is started only when the UE receives the signal and is closed at other moments, the method of the embodiment can shorten the starting time of the radio frequency working unit of the UE, thereby reducing the power consumption of the UE.

On the basis of the fourth embodiment and the sixth embodiment, before the UE acquires the timing offset indicator corresponding to the co-frequency point, the method further includes: and the UE configures the timing deviation indication. If the UE is a TDD terminal, the UE configures a timing deviation mark to indicate each cell as a synchronous cell. Optionally, after each n times of co-frequency neighbor cell searches, the UE configures a timing offset flag to indicate that each cell is an asynchronous cell, where n is a positive integer greater than or equal to 1.

Fig. 9 is a schematic structural diagram of a UE according to a seventh embodiment of the present invention, and as shown in fig. 9, the UE according to this embodiment may include: the device comprises an acquisition module 11, a determination module 12 and a receiving module 13.

The acquiring module 11 is configured to acquire a timing deviation flag corresponding to a common-frequency point when the UE performs a search for a common-frequency neighboring cell, where the timing deviation flag is used to indicate that each cell is a synchronous cell or an asynchronous cell;

a determining module 12, configured to determine whether each cell in the multiple cells corresponding to the common-frequency points is a synchronous cell according to the timing deviation indicator obtained by the obtaining module 11;

a receiving module 13, configured to receive, if the determining module 12 determines that each cell is a synchronization cell, a signal within a preset time of a serving cell in the multiple cells in a search period, and close a radio frequency operating unit at a time other than the preset time in the search period, where the preset time is a subframe or an orthogonal frequency division multiplexing OFDM symbol where the primary synchronization signal and the secondary synchronization signal are located.

Wherein the signals in the preset time of the serving cell in the plurality of cells include: a primary synchronization signal and a secondary synchronization signal of a serving cell, and primary synchronization signals and secondary synchronization signals of other cells in the plurality of cells.

When the UE is a frequency division duplex FDD terminal, the primary synchronization signal and the secondary synchronization signal are both contained in the subframe 0 and the subframe 5, and the receiving module 13 is specifically configured to: receiving signals in any subframe 0 or any subframe 5 of the serving cell in the search period; or, receiving a signal in a specific OFDM symbol of any 0 th subframe or any 5 th subframe of the serving cell in the search period, where the specific OFDM symbol is an OFDM symbol in which the primary synchronization signal and the secondary synchronization signal are located.

When the UE is a TDD terminal, the primary synchronization signal is included in the subframe No. 1 and the subframe No. 6, the secondary synchronization signal is included in the subframe No. 0 and the subframe No. 5, and the receiving module 13 is specifically configured to: receiving signals in any group of 0 subframes and 1 subframes of the serving cell in the search period, or receiving signals in any group of 5 subframes and 6 subframes of the serving cell in the search period, wherein the 0 subframes and the 1 subframes are continuous, and the 5 subframes and the 6 subframes are continuous; or, receiving signals in specific OFDM symbols of any group of subframes 0 and 1 of the serving cell in the search period, or receiving signals in specific OFDM symbols of any group of subframes 5 and 6 of the serving cell in the search period, where the specific OFDM symbols are OFDM symbols where the primary synchronization signal and the secondary synchronization signal are located, the subframes 0 and 1 are consecutive, and the subframes 5 and 6 are consecutive.

The apparatus of this embodiment may be used to implement the technical solutions of the first to third embodiments, and the implementation principles and technical effects are similar, which are not described herein again.

Fig. 10 is a schematic structural diagram of a UE according to an eighth embodiment of the present invention, and as shown in fig. 10, the apparatus according to this embodiment may further include, on the basis of the apparatus structure shown in fig. 9: a configuring module 14, configured to configure the timing offset indicator for the UE.

The configuration module 14 is specifically configured to: and if the UE is a Time Division Duplex (TDD) terminal, configuring the timing deviation mark to indicate each cell as a synchronous cell. And if the UE is a frequency division duplex FDD terminal, configuring the timing deviation marks to indicate that each cell is an asynchronous cell when the timing deviation marks are initially configured.

If the UE is an FDD terminal, the configuration module 14 is further configured to, after performing initial configuration on the timing offset indicator: when the high-level of the network side equipment configures the UE to only measure the service cell and not to search the adjacent cells with the same frequency, configuring the timing deviation mark to indicate that each cell is a synchronous cell; or when the UE searches for the co-frequency neighboring cells, if the timing deviation flag indicates that each cell is an asynchronous cell, and the UE determines, according to the co-frequency neighboring cell search result corresponding to the asynchronous cell, that the timing deviation of each searched cell is smaller than a timing deviation threshold, configuring the timing deviation flag to indicate that each cell is a synchronous cell.

Further, the configuration module 14 is further configured to: and after every n times of same-frequency neighbor cell search, configuring the timing deviation mark to indicate that each cell is an asynchronous cell so as to ensure that newly-added different-frequency neighbor cells can be found in time, wherein n is a positive integer greater than or equal to 1.

Fig. 11 is a schematic structural diagram of a UE according to a ninth embodiment of the present invention, and as shown in fig. 11, the UE according to the present embodiment includes: a first determining module 21, an obtaining module 22, a second determining module 23 and a receiving module 24.

The first determining module 21 is configured to determine whether a pilot frequency point has a reference cell according to a result of pilot frequency neighbor cell search when the UE performs pilot frequency neighbor cell search;

an obtaining module 22, configured to obtain a timing deviation indicator corresponding to the pilot frequency point when the first determining module 21 determines that the pilot frequency point has a reference cell, where the timing deviation indicator is used to indicate that each cell is a synchronous cell or an asynchronous cell;

a second determining module 23, configured to determine whether each cell in the multiple cells corresponding to the pilot frequency point is a synchronous cell according to the timing deviation indicator obtained by the obtaining module 22;

a receiving module 24, configured to receive, when the second determining module 23 determines that each cell is a synchronization cell, a signal within a preset time of a reference cell in the multiple cells in a search period, and close the radio frequency working unit at a time other than the preset time in the search period, where the preset time is a subframe or an orthogonal frequency division multiplexing OFDM symbol where the primary synchronization signal and the secondary synchronization signal are located.

Wherein, the signals in the preset time of the reference cell in the plurality of cells include: a primary synchronization signal and a secondary synchronization signal of a reference cell, and a primary synchronization signal and a secondary synchronization signal of other cells in the plurality of cells.

In one case, when the UE is a frequency division duplex FDD terminal, the primary synchronization signal and the secondary synchronization signal are both contained in the subframe No. 0 and the subframe No. 5, and the receiving module 24 is specifically configured to: receiving signals in any 0 subframe or any 5 subframe of the reference cell in a search period; or, receiving a signal in a specific OFDM symbol of any 0 th subframe or any 5 th subframe of the reference cell in a search period, where the specific OFDM symbol is an OFDM symbol in which the primary synchronization signal and the secondary synchronization signal are located.

In another case, when the UE is a TDD terminal, the primary synchronization signal is included in a subframe No. 1 and a subframe No. 6, the secondary synchronization signal is included in a subframe No. 0 and a subframe No. 5, and the receiving module 24 is specifically configured to: receiving signals in any group of subframes No. 0 and No. 1 of the reference cell in the search period, or receiving signals in any group of subframes No. 5 and No. 6 of the reference cell in the search period, wherein the subframes No. 0 and No. 1 are continuous, and the subframes No. 5 and No. 6 are continuous; or, receiving signals in specific OFDM symbols of any group of sub-frames 0 and 1 of the reference cell in the search period, or receiving signals in specific OFDM symbols of any group of sub-frames 5 and 6 of the reference cell in the search period, where the specific OFDM symbols are OFDM symbols where the primary synchronization signal and the secondary synchronization signal are located, the sub-frame 0 and the sub-frame 1 are consecutive, and the sub-frame 5 and the sub-frame 6 are consecutive.

The UE of this embodiment may be configured to execute the technical solutions of the fourth to sixth embodiments, and the implementation principle and the technical effect are similar, which are not described herein again.

Fig. 12 is a schematic structural diagram of a UE according to a tenth embodiment of the present invention, and as shown in fig. 12, the apparatus according to this embodiment may further include, on the basis of the apparatus structure shown in fig. 11: a configuring module 25, configured to configure the timing offset indicator for the UE.

The configuration module 25 is specifically configured to: and if the UE is a Time Division Duplex (TDD) terminal, configuring the timing deviation mark to indicate each cell as a synchronous cell. If the UE is a frequency division duplex FDD terminal, configuration module 25 configures the timing offset indicator to indicate that each cell is an asynchronous cell when initially configuring the timing offset indicator.

When the UE is an FDD terminal, the configuration module 25 is further configured to: and when the UE searches the pilot frequency adjacent cells, if the timing deviation marks indicate that each cell is an asynchronous cell and the UE judges that the timing deviation of each searched cell is smaller than a timing deviation threshold value according to the pilot frequency adjacent cell search result corresponding to the asynchronous cell, configuring the timing deviation marks to indicate that each cell is a synchronous cell.

Further, the configuration module 25 is further configured to: and after every n times of pilot frequency adjacent cell search, configuring the timing deviation mark to indicate that each cell is an asynchronous cell, wherein n is a positive integer greater than or equal to 1.

In this embodiment, the first determining module 21 specifically includes: calculation section 211, determination section 212, and reference cell determination section 213.

A calculating unit 211, configured to calculate normalized cross-correlation values of primary synchronization signals corresponding to the cells according to the primary synchronization signals of the cells corresponding to the pilot frequency points, and calculate normalized cross-correlation values of secondary synchronization signals corresponding to the cells according to the secondary synchronization signals of the cells corresponding to the pilot frequency points;

a determining unit 212, configured to determine whether at least one cell to be selected exists in each cell corresponding to the pilot frequency point, where a normalized cross-correlation value of a primary synchronization signal of each cell to be selected is greater than a preset normalized cross-correlation threshold of the primary synchronization signal, and a normalized cross-correlation value of an auxiliary synchronization signal of each cell to be selected is greater than a preset normalized cross-correlation threshold of the auxiliary synchronization signal;

a reference cell determining unit 213, configured to determine that the pilot frequency point does not have a reference cell if at least one cell to be selected does not exist in each cell corresponding to the pilot frequency point, determine that the pilot frequency point has the reference cell if at least one cell to be selected exists in each cell corresponding to the pilot frequency point, and select one cell from the at least one cell to be selected as the reference cell.

The calculating unit 211 is specifically configured to:

The reference cell determining unit 213 is specifically configured to: selecting a cell with the maximum primary synchronization signal normalization value or the maximum secondary synchronization signal normalization value from the at least one cell to be selected as the reference cell; or selecting the cell with the maximum sum of the primary synchronization signal normalization value and the secondary synchronization signal normalization value from the cells to be selected as the reference cell.

It should be noted that the functional module division is only one embodiment, and in a specific embodiment, a person skilled in the art may make different functional module divisions according to specific situations to execute the method with reference to the descriptions of the above embodiments, so as to complete the functions of the present invention and achieve the effects of the present invention. In a specific embodiment, the modules may be software modules, which are executed by a hardware device having a software executing function, such as a computer processor, a cpu, a logic circuit, or the like, to perform the above-described method. The software modules may also be hardware components, such as executed by respective hardware components in a switch in the SDN network architecture. Those skilled in the art, with reference to the above embodiments, may make corresponding modifications (such modifications may be in the form of software, firmware, or hardware) on corresponding hardware components in the controller according to the description of the embodiments or add new hardware components to achieve the functions and effects of the present invention.

Fig. 13 is a schematic structural diagram of a UE according to an eleventh embodiment of the present invention, and as shown in fig. 13, a UE300 according to this embodiment includes: the processor 31, the memory 32, the receiver 33 and the system bus 34, wherein the processor 31, the memory 32 and the receiver 33 can be connected and communicate with each other through the bus 34. The processor 31 may be a Central Processing Unit (CPU), an application-specific integrated circuit (ASIC), or the like. The memory 32 may include: random Access Memory (RAM), read-only memory (ROM), magnetic disk, and other entities having a storage function. The memory 32 for storing computer-executable instructions 321; the processor 31 is configured to execute the computer executable instructions 321 to perform the methods of the first to third embodiments and combinations thereof.

The processor 31 is configured to obtain a timing deviation flag corresponding to a common-frequency point when a user equipment UE performs a search for a common-frequency neighboring cell, and determine whether each cell in a plurality of cells corresponding to the common-frequency point is a synchronous cell according to the timing deviation flag, where the timing deviation flag is used to indicate that each cell is a synchronous cell or an asynchronous cell;

if the cells are synchronous cells, the receiver 33 receives signals within a preset time of a serving cell in the cells in a search period, and turns off the radio frequency working unit at a time other than the preset time in the search period, where the preset time is a subframe or an orthogonal frequency division multiplexing OFDM symbol where the primary synchronization signal and the secondary synchronization signal are located.

In one case, when the UE is a frequency division duplex FDD terminal, the primary synchronization signal and the secondary synchronization signal are both contained in subframe No. 0 and subframe No. 5, and the receiver 33 is specifically configured to: receiving signals in any subframe 0 or any subframe 5 of the serving cell in the search period; or, receiving a signal in a specific OFDM symbol of any 0 th subframe or any 5 th subframe of the serving cell in the search period, where the specific OFDM symbol is an OFDM symbol in which the primary synchronization signal and the secondary synchronization signal are located.

In another case, when the UE is a TDD terminal, the primary synchronization signal is contained in the subframe No. 1 and the subframe No. 6, the secondary synchronization signal is contained in the subframe No. 0 and the subframe No. 5, and the receiver 33 is specifically configured to: receiving signals in any group of subframes 0 and 1 of the serving cell in the search period, or receiving signals in any group of subframes 5 and 6 of the serving cell by the UE in the search period, wherein the subframes 0 and 1 are continuous, and the subframes 5 and 6 are continuous; or, receiving signals in specific OFDM symbols of any group of subframes 0 and 1 of the serving cell in the search period, or receiving signals in specific OFDM symbols of any group of subframes 5 and 6 of the serving cell in the search period, where the specific OFDM symbols are OFDM symbols where the primary synchronization signal and the secondary synchronization signal are located, the subframes 0 and 1 are consecutive, and the subframes 5 and 6 are consecutive.

In this embodiment, before the processor 31 obtains the timing deviation indication corresponding to the co-frequency point, it is further configured to: and configuring the timing deviation indication. The processor 31 configures the timing deviation indicator, specifically: and if the UE is a Time Division Duplex (TDD) terminal, configuring the timing deviation mark to indicate each cell as a synchronous cell. If the UE is a frequency division duplex FDD terminal, the processor 31 configures the timing offset indicator to indicate each cell is an asynchronous cell when initially configuring the timing offset indicator.

When the UE is an FDD terminal, after the processor 31 initially configures the timing offset indicator, the processor 31 is further configured to: when the high-level of the network side equipment configures the UE to only measure the service cell and not to search the adjacent cells with the same frequency, configuring the timing deviation mark to indicate that each cell is a synchronous cell; or when the UE searches the same-frequency neighbor cells, if the timing deviation marks indicate that the cells are asynchronous cells and the searched timing deviation of the cells is judged to be smaller than a timing deviation threshold value according to the same-frequency neighbor cell search result corresponding to the asynchronous cells, configuring the timing deviation marks to indicate that the cells are synchronous cells.

Further, the processor 31, when configuring the timing deviation indicator, is further configured to: and after every n times of same-frequency neighbor cell search, configuring the timing deviation mark to indicate that each cell is an asynchronous cell, wherein n is a positive integer greater than or equal to 1.

The UE of this embodiment may be configured to execute the technical solutions of the first to third embodiments, and the implementation principles and technical effects are similar, which are not described herein again.

Fig. 14 is a schematic structural diagram of a UE according to a twelfth embodiment of the present invention, and as shown in fig. 14, a U400 of this embodiment includes: the processor 41, the memory 42, the receiver 43 and the system bus 44, wherein the processor 41, the memory 42 and the receiver 43 can be connected and communicate with each other through the bus 44. The processor 41 may be a Central Processing Unit (CPU), an application-specific integrated circuit (ASIC), or the like. The memory 42 may include: random Access Memory (RAM), read-only memory (ROM), magnetic disk, and other entities having a storage function. The memory 42 for storing computer execution instructions 421; the processor 41 is configured to execute the computer-executable instructions 421 to perform the methods of the fourth to sixth embodiments and combinations thereof.

The processor 41 is configured to determine whether a reference cell exists in the pilot frequency point according to a result of pilot frequency neighbor cell search when the UE performs pilot frequency neighbor cell search;

if the pilot frequency point has a reference cell, the processor 41 is configured to obtain a timing deviation flag corresponding to the pilot frequency point, and determine whether each cell in a plurality of cells corresponding to the pilot frequency point is a synchronous cell according to the timing deviation flag, where the timing deviation flag is used to indicate that each cell is a synchronous cell or an asynchronous cell;

if the cells are synchronous cells, the receiver 43 is configured to receive a signal within a preset time of a reference cell in the multiple cells in a search period, and close the radio frequency operating unit at a time other than the preset time in the search period, where the preset time is a subframe or an orthogonal frequency division multiplexing OFDM symbol where the primary synchronization signal and the secondary synchronization signal are located. Wherein, the signals in the preset time of the reference cell in the plurality of cells include: a primary synchronization signal and a secondary synchronization signal of a reference cell, and a primary synchronization signal and a secondary synchronization signal of other cells in the plurality of cells.

The processor 41 determines whether the pilot frequency point has a reference cell according to the result of the pilot frequency neighbor cell search, specifically: firstly, respectively calculating the normalized cross-correlation value of the main synchronous signal corresponding to each cell according to the main synchronous signal of each cell corresponding to the pilot frequency point, and respectively calculating the normalized cross-correlation value of the auxiliary synchronous signal corresponding to each cell according to the auxiliary synchronous signal of each cell corresponding to the pilot frequency point; then, judging whether at least one cell to be selected exists in each cell corresponding to the pilot frequency point, wherein the normalized cross-correlation value of the main synchronous signal of each cell to be selected is greater than a preset normalized cross-correlation threshold value of the main synchronous signal, and the normalized cross-correlation value of the auxiliary synchronous signal of each cell to be selected is greater than a preset normalized cross-correlation threshold value of the auxiliary synchronous signal; if at least one cell to be selected does not exist in each cell corresponding to the pilot frequency point, determining that the pilot frequency point does not have a reference cell; and if at least one cell to be selected exists in each cell corresponding to the pilot frequency point, determining that the pilot frequency point has a reference cell, and selecting one cell from the at least one cell to be selected as the reference cell.

The processor 41 selects one cell from the at least one cell to be selected as the reference cell, specifically: selecting a cell with the maximum primary synchronization signal normalization value or the maximum secondary synchronization signal normalization value from the at least one cell to be selected as the reference cell; or selecting the cell with the maximum sum of the primary synchronization signal normalization value and the secondary synchronization signal normalization value from the cells to be selected as the reference cell.

When the processor 41 calculates the normalized cross-correlation value of the primary synchronization signal corresponding to each cell according to the primary synchronization signal of each cell corresponding to the pilot frequency point, and calculates the normalized cross-correlation value of the secondary synchronization signal corresponding to each cell according to the secondary synchronization signal of each cell corresponding to the pilot frequency point, specifically:

wherein N is_RI represents an index of the receiving antenna of the UE, and i is 0,1, …, N_R-1，For a time domain signal corresponding to a primary synchronization signal of a cell to be calculated, pss (N) is a time domain sequence sampled from the time domain signal corresponding to the primary synchronization signal of the cell to be calculated, N is 0,1, …, N-1, N is the length of the time domain sequence, and pss^*(n) is the conjugate of pss (n), L is 64, and M is 2.

In a situation of this embodiment, when the UE is a frequency division duplex FDD terminal, the primary synchronization signal and the secondary synchronization signal are both contained in the subframe No. 0 and the subframe No. 5, and the receiver 43 is specifically configured to: receiving signals in any 0 subframe or any 5 subframe of the reference cell in a search period; or, receiving a signal in a specific OFDM symbol of any 0 th subframe or any 5 th subframe of the reference cell in a search period, where the specific OFDM symbol is an OFDM symbol in which the primary synchronization signal and the secondary synchronization signal are located.

In another situation of this embodiment, when the UE is a TDD terminal, the primary synchronization signal is included in the subframe No. 1 and the subframe No. 6, the secondary synchronization signal is included in the subframe No. 0 and the subframe No. 5, and the receiver 43 is specifically configured to: receiving signals in any group of subframes No. 0 and No. 1 of the reference cell in the search period, or receiving signals in any group of subframes No. 5 and No. 6 of the reference cell in the search period, wherein the subframes No. 0 and No. 1 are continuous, and the subframes No. 5 and No. 6 are continuous; or, receiving signals in specific OFDM symbols of any group of sub-frames 0 and 1 of the reference cell in the search period, or receiving signals in specific OFDM symbols of any group of sub-frames 5 and 6 of the reference cell in the search period, where the specific OFDM symbols are OFDM symbols where the primary synchronization signal and the secondary synchronization signal are located, the sub-frame 0 and the sub-frame 1 are consecutive, and the sub-frame 5 and the sub-frame 6 are consecutive.

Further, before obtaining the timing deviation indication corresponding to the pilot frequency point, the processor 41 is further configured to: and configuring the timing deviation indication for the UE. When configuring the timing deviation indicator, the processor 41 is specifically configured to: and if the UE is a Time Division Duplex (TDD) terminal, configuring the timing deviation mark to indicate each cell as a synchronous cell. And if the UE is a frequency division duplex FDD terminal, configuring the timing deviation marks to indicate that each cell is an asynchronous cell when the timing deviation marks are initially configured.

When the UE is an FDD terminal, after performing initial configuration on the timing offset indicator, the processor 41 is further configured to: when the UE searches the pilot frequency adjacent cells, if the timing deviation marks indicate that each cell is an asynchronous cell and the timing deviation of each searched cell is judged to be smaller than the timing deviation threshold value according to the pilot frequency adjacent cell searching result corresponding to the asynchronous cell, the timing deviation marks are configured to indicate that each cell is a synchronous cell.

Processor 41 is further configured to: and after every n times of pilot frequency adjacent cell search, configuring the timing deviation mark to indicate that each cell is an asynchronous cell, wherein n is a positive integer greater than or equal to 1.

The specific implementation of each module or unit of the UE embodiment may refer to the previous method embodiment.

Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; 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 embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for reducing power consumption of a user equipment, comprising

2. The method of claim 1, wherein when the UE is a frequency division duplex, FDD, terminal, the primary synchronization signal and the secondary synchronization signal are both contained in subframe 0 and subframe 5, and the UE receives signals within a preset time of the serving cell in a search period, comprising:

or,

3. The method of claim 1, wherein when the UE is a TDD terminal, the primary synchronization signal is contained in subframe 1 and subframe 6, the secondary synchronization signal is contained in subframe 0 and subframe 5, and the UE receives a signal within a preset time of the serving cell in a search period, comprising:

or,

4. The method according to any one of claims 1-3, wherein before the UE obtains the timing deviation indication corresponding to the co-frequency points, the method further comprises:

and the UE configures the timing deviation indication.

5. The method of claim 4, wherein the UE configures the timing offset indicator to include:

6. The method of claim 4, wherein the UE configures the timing offset indicator to include:

7. The method of claim 6, wherein the UE configures the timing offset indicator after initially configuring the timing offset indicator, further comprising:

8. The method of claim 7, wherein the UE configuring the timing offset indicator further comprises:

9. The method according to any of claims 1-8, wherein the signals within the preset time of the serving cell of the plurality of cells comprise: a primary synchronization signal and a secondary synchronization signal of a serving cell, and primary synchronization signals and secondary synchronization signals of other cells in the plurality of cells.

10. A method for reducing power consumption of a user device, comprising:

11. The method of claim 10, wherein when the UE is a frequency division duplex, FDD, terminal, the primary synchronization signal and the secondary synchronization signal are both contained in subframe 0 and subframe 5, and wherein the UE receives the signal of the reference cell within a preset time in a search period, comprising:

or,

12. The method of claim 10, wherein when the UE is a TDD terminal, the primary synchronization signal is contained in subframe No. 1 and subframe No. 6, the secondary synchronization signal is contained in subframe No. 0 and subframe No. 5, and the UE receives the signal of the reference cell within a preset time during a search period, comprising:

or,

13. The method according to any one of claims 10 to 12, wherein the determining, by the UE, whether the pilot frequency cell has the reference cell according to the result of the pilot frequency neighbor cell search includes:

14. The method of claim 13, wherein the selecting, by the UE, one cell from the at least one candidate cell as the reference cell comprises:

15. The method according to claim 13 or 14, wherein the UE calculates normalized cross-correlation values of primary synchronization signals corresponding to the cells according to the primary synchronization signals of the cells corresponding to the pilot frequency points, and calculates normalized cross-correlation values of secondary synchronization signals corresponding to the cells according to the secondary synchronization signals of the cells corresponding to the pilot frequency points, respectively, including:

16. The method according to any of claims 10-15, wherein before the UE obtains the indication of the timing deviation corresponding to the pilot frequency point, the method further comprises:

and the UE configures the timing deviation indication.

17. The method of claim 16, wherein the UE configures the timing offset indicator to include:

18. The method of claim 16, wherein the UE configures the timing offset indicator to include:

19. The method of claim 18, wherein the UE configures the timing offset indicator after initially configuring the timing offset indicator, further comprising:

20. The method of claim 19, wherein the UE configuring the timing offset indicator further comprises:

21. The method according to any of claims 10-20, wherein the signals within the preset time of the reference cell of the plurality of cells comprise: a primary synchronization signal and a secondary synchronization signal of a reference cell, and a primary synchronization signal and a secondary synchronization signal of other cells in the plurality of cells.

22. A User Equipment (UE), comprising

23. The UE of claim 22, wherein when the UE is a frequency division duplex, FDD, terminal, the primary synchronization signal and the secondary synchronization signal are both contained in subframe No. 0 and subframe No. 5, and wherein the receiving module is specifically configured to:

or,

24. The UE of claim 22, wherein when the UE is a TDD terminal, the primary synchronization signal is included in subframe No. 1 and subframe No. 6, and the secondary synchronization signal is included in subframe No. 0 and subframe No. 5, the receiving module is specifically configured to:

or,

25. The UE of any one of claims 22-24, wherein the UE further comprises:

a configuration module configured to configure the timing offset indicator.

26. The UE of claim 25, wherein the configuration module is specifically configured to:

27. The UE of claim 25, wherein the configuration module is specifically configured to:

28. The UE of claim 27, wherein the configuration module, after initially configuring the timing offset indicator, is further configured to:

29. The UE of claim 28, wherein the configuration module is further configured to:

30. The UE of any of claims 22-29, wherein the signals within the preset time of a serving cell of the plurality of cells comprise: a primary synchronization signal and a secondary synchronization signal of a serving cell, and primary synchronization signals and secondary synchronization signals of other cells in the plurality of cells.

31. A User Equipment (UE), comprising:

32. The UE of claim 31, wherein when the UE is a frequency division duplex, FDD, terminal, the primary synchronization signal and the secondary synchronization signal are both contained in subframe No. 0 and subframe No. 5, and wherein the receiving module is specifically configured to:

or,

33. The UE of claim 31, wherein when the UE is a TDD terminal, the primary synchronization signal is included in subframe No. 1 and subframe No. 6, and the secondary synchronization signal is included in subframe No. 0 and subframe No. 5, the receiving module is specifically configured to:

or,

34. The UE according to any of claims 31-33, wherein the first determining module specifically comprises:

35. The UE of claim 34, wherein the reference cell determining unit is specifically configured to:

36. The UE of claim 34 or 35, wherein the computing unit is specifically configured to:

37. The UE of any one of claims 31-36, wherein the UE further comprises:

a configuration module configured to configure the timing offset indicator.

38. The UE of claim 37, wherein the configuration module is specifically configured to:

39. The UE of claim 37, wherein the configuration module is specifically configured to:

40. The UE of claim 39, wherein the configuration module is further configured to:

41. The UE of claim 40, wherein the configuration module is further configured to:

42. The UE of any of claims 31-41, wherein the signals in the predetermined time of the reference cell of the plurality of cells comprise: a primary synchronization signal and a secondary synchronization signal of a reference cell, and a primary synchronization signal and a secondary synchronization signal of other cells in the plurality of cells.