CN1462122A - Non-continuous demodulation realizing method for power saving at mobile terminal - Google Patents

Abstract

The invention relates to a method for realizing discontinuous demodulation to save power for a mobile terminal. The two updating mechanisms of the system information block (SIB) defined by the 3GPP are processed separately, which can save the battery consumption of the terminal equipment (UE). Including: After the UE is powered on, it continuously receives and demodulates the basic public physical channel (PCCPCH) including the SIB; the radio resource control module (RRC) checks the SIB (changing slowly) based on the update mechanism indicated by the tag (VALUE_TAG) after receiving Between the period of time when its information is updated, notify the physical layer (PHY) to stop demodulating the PCCPCH radio frames corresponding to these SIBs, and work in a discontinuous demodulation state; RRC updates the SIB based on the timer periodic update mechanism ( Changes quickly), monitor each update cycle in real time, and work in a continuous demodulation state. Send corresponding control commands such as primitives to PHY through RRC to realize discontinuous demodulation of PCCPCH, and demodulate only at the moment when it needs to be received. Further, the battery consumption of the UE is greatly saved.

Description

A Discontinuous Demodulation Realization Method for Power Saving of Mobile Terminals

technical field

The present invention relates to the technology of the third generation wireless communication system (3G), in particular to the radio resource control module (RRC) on the side of the terminal equipment (UE) to receive the basic common physical channel (PCCPCH) of the physical layer (PHY) Control, and then realize the method of its discontinuous demodulation mechanism.

Background technique

System information (common control information) is not information specific to a certain UE, but refers to common information of a certain cell or the entire Radio Network Subsystem (RNS). There are many system messages, all of which are broadcast through the broadcast channel. When broadcasting, system information is divided into system information blocks (SIBs) according to characteristics. Each SIB contains system information of the same characteristic. For example, SIB1 mainly contains timers and counters needed by UE in idle mode or connected mode. Different SIBs have different characteristics like rate or conditions when UE reads them etc.

The method for the UE to read the system broadcast message is: first read the master information block MIB (masterinformation blocks), and then analyze the scheduling information of each SIB and SB contained in the MIB to determine when the UE should read or go Demodulate and decode broadcast channels.

Each SIB appears repeatedly on the broadcast channel, and there is no need for the UE to read them repeatedly. After the UE reads a required system information block SIB, theoretically, it does not need to read the broadcast channel (BCH ), that is, RRC can stop receiving the broadcast channel. But when some or all SIBs change, the UE has to read the broadcasted new information.

In the technical specifications formulated by the third generation partnership project organization 3GPP, there are currently two physical channels for transmitting common control information: a basic common physical channel (PCCPCH) and a second common physical channel (SCCPCH). The PCCPCH channel is a downlink physical channel at a fixed rate, and is used to bear the broadcast channel BCH. In this technical specification, there is a Discontinuous Reception (DRX) mechanism of SCCPCH channel coordinated with PICH, so as to save battery consumption of UE.

However, the technical specification does not stipulate whether the PCCPCH channel can adopt the discontinuous reception mechanism (DRX).

Therefore, under normal circumstances, the PCCPCH channel is designed to receive continuously in IDLE (idle mode, only registered in the core network), CELL_PCH (registered in the access network), URA_PCH (registered in the access network) and other states , causing the UE to consume more energy due to continuous reception of the PCCPCH channel.

On the other hand, it is also stipulated in the existing technical specifications that: the information of the PCCPCH channel is demodulated by the UE physical layer, only the system frame number SFN (a number from 0 to 4095 cycles) needs to be obtained, and other demodulated data Then it is handed over to the radio resource control module (RRC) of the upper layer of the UE for processing. The radio resource control module (RRC) of the upper layer only needs to read the content of the system information block (SIB) carried in it from the demodulated data, such as Configuration, measurement control and other information, and control the physical layer and other parts accordingly.

It is also stipulated in the existing technical specifications that the various SIBs transmitted by the PCCPCH channel belong to two update mechanisms, one is a periodic update mechanism based on a timer, that is, it is updated every certain time, and the SIBs belonging to this type of update mechanism It has the characteristics of rapid change of parameter values, but the number and content are small; the other is the update mechanism based on the label VALUE_TAG indication, that is, when the VALUE_TAG value corresponding to a certain system information block (SIB) changes, it indicates that the SIB The corresponding system information has changed, and the SIBs that usually belong to this type of update mechanism have the characteristics of slow change in parameter values, but the number and content are large.

Contents of the invention

The purpose of the present invention is to design a discontinuous demodulation method for saving power in mobile terminals, and effectively save energy consumption of terminal equipment (UE) by realizing discontinuous reception of PCCPCH channels.

The basis of the design of the present invention is that it can be known periodically from the system information that once the SIB based on the update mechanism indicated by the tag VALUE_TAG is received, the demodulation can be stopped before it is updated. It is just that the SIB based on the timer update mechanism is updated faster and needs to be monitored in real time. However, because the number and content of the SIB of the timer update mechanism are small, it can be specially processed to obtain better efficiency.

The technical solution for realizing the purpose of the present invention is as follows: a discontinuous demodulation realization method that enables mobile terminals to save power, after the terminal equipment (UE) is turned on, it continuously receives and demodulates the basic public physical channel (PCCPCH), including the main message block (MIB) and other system information blocks (SIBs) that need to be received, characterized in that it also includes:

A. For the system information block (SIB) based on the update mechanism indicated by the tag (VALUE_TAG), stop the basic public physical channel ( PCCPCH) wireless frame demodulation, work in discontinuous demodulation state;

B. For the system information block (SIB) based on the timer periodic update mechanism, perform real-time monitoring and demodulation for each update cycle.

In the step A, the control of the discontinuous demodulation state is realized by setting an optimized internal interface of the terminal equipment (UE) between the physical layer (PHY) and the radio resource control module (RRC), including sending The primitive used to start the basic public physical channel (PCCPCH) into the discontinuous demodulation state, and the primitive used to stop the discontinuous demodulation state of the basic public physical channel (PCCPCH) and switch to the continuous demodulation state, the primitive The term is delivered to the physical layer (PHY) by the radio resource control module (RRC).

The technical idea of the present invention is to treat the system information of two different updating mechanisms separately. Initially, the PCCPCH is continuously demodulated. After the SIB of the index label VALUE_TAG update mechanism is received, only the SIB of the timer update mechanism is left, and the state of PCCPCH discontinuous demodulation is transferred.

Demodulate the system information block (SIB) of the timer update mechanism, including: at each segment list position of the system information block (SIB) of the timer update mechanism, the physical layer starts the basic public physical channel in advance according to the number of advance frames (PCCPCH) demodulation; and at each segment list position of the system information block (SIB) of the timer update mechanism, the physical layer presses the number of frames required for demodulating the system information block (SIB) of a timer update mechanism, The hysteresis stops demodulating the primary common physical channel (PCCPCH) radio frame.

The present invention controls the reception of the basic public physical channel (PCCPCH) by properly optimizing the internal interface between the radio resource control module (RRC) of the terminal equipment (UE) and the physical layer (PHY), and can treat two types of different updates respectively. Mechanism system information.

The method of the present invention adopts the PCCPCH discontinuous demodulation receiving mechanism under the IDLE, CELL_PCH, and URA_PCH states of the terminal equipment (UE), and when the SIB based on the VALUE_TAG update mechanism does not change very frequently, the basic common The physical channel (PCCPCH) is in the state of discontinuous demodulation most of the time, so the battery consumption of the terminal equipment (UE) can be greatly saved.

Description of drawings

Fig. 1 is a schematic diagram of the location of the system information block (SIB) that determines the timer update mechanism to start and stop demodulation in the discontinuous demodulation process of the present invention.

Detailed ways

The technical solution of the present invention will be further described below in conjunction with examples and accompanying drawings.

When the terminal equipment (UE) is powered on, since any system information is new to the UE, the UE receives the Master Information Block (MIB) and other System Information Blocks (SIB) that need to be received. At this time, the basic common physical channel (PCCPCH) is continuously demodulated, and the physical layer (PHY) hands over the data to the radio resource control module (RRC) for processing, and this process is the same as that of the prior art specification.

The present invention utilizes the characteristics that the various SIBs transmitted on the PCCPCH belong to two update mechanisms respectively. After receiving the SIBs based on the update mechanism indicated by the tag VALUE_TAG, the physical layer stops updating the SIBs before the VALUE_TAG indicates that its information has been updated. The PCPPCH radio frames corresponding to these SIBs are demodulated; for the SIBs based on the timer periodic update mechanism, real-time monitoring is carried out in each update period, and considering the characteristics of the small number and content of the SIBs of the timer update mechanism, the For special treatment.

RRC processes the data obtained by the physical layer and recognizes that all the SIBs of the VALUE_TAG mechanism have been received. At present, only the SIBs of the timer update mechanism need to be updated. Continuous demodulation, and notify the parameters of the physical layer timer update mechanism.

In order to realize the control of the physical layer action, the present invention adds an optimized UE internal interface between the RRC and the physical layer, including the use of two primitives to schedule messages.

One primitive is CPHY-DISCONT-DEM-START, which is sent by RRC to the physical layer to start discontinuous demodulation of PCCPCH channel. The primitive parameters include synchronization advance, number of SIBs, update period REP, number of segments and a list of locations.

Wherein, the synchronization advance amount is used for starting PCCPCH discontinuous demodulation and needs to advance several frames for physical layer system frame number (SFN) synchronization, and the default value is 4.

The number of SIBs is usually 1, indicating that there is only one SIB with a timer update mechanism, and if the number of SIBs is greater than 1, it indicates that multiple SIBs with timer update mechanisms need to be monitored.

The cycle REP is the SIB-REP corresponding to the timer update mechanism SIB; the number of segments refers to how many segments the timer update mechanism SIB is divided into; the position list is the specific position of each segment in this cycle.

For example, when entering the discontinuous demodulation period of PCCPCH, the physical layer can decide to start demodulating PCCPCH when the SFN mod period REP=position [0] (or position [1], position [2], ...) according to the interface parameters The number of frames that need to be advanced, such as demodulating the broadcast channel for a transmission block TB needs 2 frames, that is, in the SFN mod cycle REP=position [0]+2 (or position [1]+2, position [2]+2, ...) Start demodulation (deciding when to start demodulating PCCPCH); and considering that the demodulation of PCCPCH on the physical layer of the UE needs an advanced SFN timing synchronization process to ensure the stability of demodulation, for each component that needs to be received segment, the above-mentioned start demodulation of PCCPCH should be several frames earlier than the position of the SIB segment, and the advance amount is sent to the physical layer in the primitive CPHY-DISCONT-DEM-START.

Another primitive is CPHY-DISCONT-DEM-STOP, which is sent to the physical layer by RRC to stop discontinuous demodulation of PCCPCH and switch to continuous demodulation. This primitive does not require any parameters.

Therefore, once the UE monitors that the SIB with the label VALUE_TAG indicating the update mechanism changes, the RRC sends the primitive CPHY-DISCONT-DEM-STOP to the physical layer, and controls the physical layer to switch to PCCPCH for continuous demodulation until the changed SIB ( After VALUE_TAG update mechanism) is received, RRC sends the primitive CPHY-DISCONT-DEM-START to the physical layer again to control the physical layer to switch to PCCPCH discontinuous demodulation.

Referring to Figure 1, it shows the situation of discontinuous demodulation in one cycle.

It is stipulated in the 3GPP protocol that the system information block SIB7 is a SIB of a timer update mechanism.

Assuming that there is only a SIB with a timer update mechanism of SIB7, its scheduling information is: update period SIB_REP=256, the number of physical frames occupied by the SIB SIB_COUNT=2, the position of the first transport block of the SIB SIB_POS[0 ]=26 (specified in the protocol), the position of the second transport block of the SIB SIB_POS[1]=58 (specified in the protocol).

After receiving all the SIBs of the VALUE_TAG update mechanism, RRC sends the primitive CPHY-DISCONT-DEM-START to the physical layer through the interface with the physical layer. The parameters corresponding to this primitive: the number of SIBs is 1, and the periodic REP is 256, the number of segments is 2, the segment list position [0] is 26, and the segment list position [1] is 58 (the default synchronization advance is 4).

The discontinuous demodulation of PCCPCH is realized in the physical layer. The specific operation is as follows:

Frames are marked on the time axis in the figure: 0, 22, 26, 28, 54, 58, 60, 256. The physical layer starts PCCPCH demodulation (that is, advances 4 frames to obtain synchronization) when SFNmod 256=22 (advance 4 frames on the position [0] basis 26 frames), as shown in the starting position of frame 11 in the figure, in SFN mod 128 =28 (demodulation of a transport block TB needs 2 frames, position [0]+2) to stop PCCPCH demodulation (the first transport block of SIB7 has been received), as shown in the end position of frame 12. In the figure, blocks 12 and 14 represent the SFN (two frames from 26 to 28 and two frames from 58 to 60) that need to be demodulated in the SIB7 segment of the timer update mechanism, and blocks 11 and 13 represent the synchronization advance of the synchronous SFN (two frames from 22 to 26 four frame, 54 to 58 four frames), and the rest is the sending part of the non-timer update mechanism SIB.

The physical layer starts PCCPCH demodulation when SFN mod 256=54 (position [1]) (4 frames in advance to obtain synchronization), as shown in the starting position of box 13 in the figure, at SFN mod 128=60 (demodulation of a transmission The block TB needs 2 frames, and PCCPCH demodulation is stopped at position [1]+2) (the second transmission block of SIB7 has been received), as shown in the end position of box 14 in the figure.

Figure 1 only describes the situation of one update period, and the demodulation situation is exactly the same in each update period.

It can be seen from the figure that in the discontinuous demodulation state of the present invention, only 12/256 (about 5%) of the time, the UE is in the active state (timer update mechanism). Normally, the UE is mostly in a state where the SIB of the VALUE_TAG update mechanism has been received.

From the above example, it can be known that when the SIB based on the VALUE_TAG update mechanism does not change very frequently, this method makes the PCCPCH of the UE in the discontinuous demodulation state most of the time, thus greatly saving the battery consumption of the UE.

When the system information is updated, RRC needs to notify the physical layer to switch to continuous demodulation in order to receive the updated SIB based on the VALUE_TAG mechanism. After receiving, turn to discontinuous demodulation again.

The present invention deals with two updating mechanisms of the system information block SIB currently defined by 3GPP, the label VALUE_TAG indication updating mechanism and the timer periodic updating mechanism, respectively. Initially demodulate PCCPCH continuously; after receiving the SIB of the index VALUE_TAG update mechanism, only need to receive the SIB of the timer update mechanism (such as SIB7, SIB9, SIB10, SIB14, SIB19), send the corresponding control command to the PHY through RRC, and turn to Enter the PCCPCH discontinuous demodulation state, that is, demodulate only at the time of reception, thereby greatly saving the battery consumption of the UE. The present invention controls PCCPCH demodulation by setting the UE internal interface between the optimized RRC and the physical layer. As for the timer cycle update mechanism in the discontinuous demodulation state, the scheme of advancing and delaying several frames can give the physical layer a period of synchronization.

It has been verified that the method of the present invention can save about 70% of power consumption in the IDLE state.

Claims (7)

1. A method for implementing discontinuous demodulation to save power for a mobile terminal. After the terminal equipment (UE) is turned on, it continuously receives and demodulates the basic public physical channel (PCCPCH), including the main message block (MIB) and other information that needs to be received. A system message block (SIB), characterized in that it also includes: A. For the system information block (SIB) based on the update mechanism indicated by the tag (VALUE_TAG), stop the basic public physical channel ( PCCPCH) wireless frame demodulation, work in discontinuous demodulation state; B. For the system information block (SIB) based on the timer periodic update mechanism, perform real-time monitoring and demodulation for each update cycle. 2. a kind of discontinuous demodulation realization method that makes mobile terminal power saving according to claim 1 is characterized in that: in described step A, to the control of discontinuous demodulation state, be in physical layer (PHY) It is realized by setting an optimized internal interface of the terminal equipment (UE) with the radio resource control module (RRC), including sending primitives for starting the basic common physical channel (PCCPCH) to enter the discontinuous demodulation state, and sending primitives for stopping Primitives of the discontinuous demodulation state of the basic public physical channel (PCCPCH) and transition to the continuous demodulation state, the primitives are sent to the physical layer (PHY) by the radio resource control module (RRC). 3. a kind of discontinuous demodulation realization method that makes mobile terminal power-saving according to claim 2 is characterized in that: described primitive language that is used to start basic public physical channel (PCCPCH) enters discontinuous demodulation state The parameters in include: the synchronization advance amount, which is used to start the basic public physical channel (PCCPCH) to enter the discontinuous demodulation state, the physical layer obtains the system frame number (SFN) for the number of advance frames required for synchronization; the system message The number of blocks (SIB) is the number of system information blocks (SIB) of the timer update mechanism that needs to be monitored; the update period (REP) is the update period (REP) of the system information block (SIB) of the timer update mechanism; The number of segments is the number of segments divided by the system information block (SIB) of the timer update mechanism; and the location list is each segment of the system information block (SIB) of the timer update mechanism, in the corresponding update period Location. 4. a kind of discontinuous demodulation realization method that makes mobile terminal power saving according to claim 2 is characterized in that: described discontinuous demodulation state for stopping basic public physical channel (PCCPCH), changes to A primitive for continuous demodulation state without any parameters. 5. A kind of discontinuous demodulation realization method that makes mobile terminal power saving according to claim 1, it is characterized in that described step A further comprises the following process: A1. The radio resource control module (RRC) processes the received data of the physical layer (PHY), and indexes out that all system information blocks (SIBs) based on the update mechanism indicated by the tag (VALUE_TAG) have been received; A2. The radio resource control module (RRC) sends scheduling information to the physical layer (PHY) for starting the basic public physical channel (PCCPCH) to enter the discontinuous demodulation state, and notifies the physical layer to switch to the basic public physical channel (PCCPCH) discontinuous To demodulate the working status, only the system information block (SIB) of the timer update mechanism needs to be demodulated; A3. The terminal equipment (UE) monitors the indication state based on the tag (VALUE_TAG) update mechanism. When the indication state changes, it starts the demodulation of the basic public physical channel (PCCPCH), and returns to step A1 for execution. 6. A kind of discontinuous demodulation realization method that makes mobile terminal power-saving according to claim 5, it is characterized in that in the described step A2, demodulates the System Information Block (SIB) of timer update mechanism, comprising: In each segment list position of the system information block (SIB) of the timer update mechanism, the physical layer starts the demodulation of the basic public physical channel (PCCPCH) in advance according to the advance amount frame number; and in the system information block (SIB) of the timer update mechanism For each segment list position of the SIB), the physical layer delays the demodulation of the basic common physical channel (PCCPCH) radio frame according to the number of frames required to demodulate a system information block (SIB) of a timer update mechanism. 7. A kind of discontinuous demodulation realization method that makes mobile terminal power-saving according to claim 6, it is characterized in that: the segmentation list position, advance amount of the system information block (SIB) of described timer update mechanism The number of frames and the number of frames required to demodulate a transport block are given in the scheduling information for entering the discontinuous demodulation state.

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