WO2009121301A1

WO2009121301A1 - A method and device for adjusting the demodulation mode

Info

Publication number: WO2009121301A1
Application number: PCT/CN2009/071132
Authority: WO
Inventors: 梅竞晋; 谭斌
Original assignee: 华为技术有限公司
Priority date: 2008-04-03
Filing date: 2009-04-01
Publication date: 2009-10-08
Also published as: CN101553052A; CN101553052B

Abstract

A method and device for adjusting the demodulation mode is provided in the embodiment of the present invention, and the said method includes the following steps: identifying whether the reuse state of the terminal is changed; adjusting the demodulation mode of the terminal if the result of the identification is that the reuse state of the terminal is changed, and the adjusted demodulation mode is the demodulation mode corresponding to the changed reuse state. Application of the present invention can realize to guarantee that the signal and data are demodulated correctly, ensure the effect of the network communication, enhance the indemnificatory of the network transmission, and improve the effect of the experience of use for users.

Description

The present invention claims the priority of the Chinese patent application filed on April 3, 2008, the Chinese Patent Application No. 200810090828.5, entitled "A Demodulation Method Identification Method and Apparatus", which The entire contents are incorporated herein by reference. Technical field

The present invention relates to the field of mobile communications, and in particular, to a method and apparatus for adjusting a demodulation mode. Background technique

How to improve spectrum efficiency has been a hot topic in the industry. As the number of users continues to increase, operators' pressure on voice capacity is increasing, especially in countries with large populations. At the same time, with the continuous development of technology, the competition is fierce, and the charging of voice services is constantly decreasing. Operators are faced with the pressure of cost and need to use hardware and frequency resources more effectively.

Traditional voice is a time slot allocated to a user. In order to increase the voice capacity, that is, to carry more voices on the same resource, one implementation method is in a time slot and ARFCN (Absolute Radio Frequency Channel Number, absolute radio frequency). Multiple users are multiplexed on the channel number, so that a significant increase in capacity can be achieved on a fixed carrier frequency and spectrum. At present, more discussions are made on multiplexing two users in one time slot. The following two examples are used to illustrate.

As shown in Figure 1, the MUROS (Multi-User Reuse One Slot) technology provides two subchannels, allowing two MSs (Mobile Stations) to operate on the same radio resource. Each MS occupies one subchannel, and the subchannels pass orthogonal or Approximate orthogonal training sequences are distinguished. For traditional CS (Circuit Switched) voice services, each burst Burst is assigned to one user, and both GMSK (Gaussian Minimum Shift-frequency Keying) modulation is used for both uplink and downlink. After the introduction of the MUR0S, in the downlink direction, the base station transmits two GMSK signals to generate a QPSK (Quadature Phase Shift Keying) signal, and the receiving end passes the mutually orthogonal training sequence and the enhanced interference cancellation technology. A signal that is not its own is eliminated as an interference signal to solve its own signal; in the uplink direction, two multiplexed MSs still transmit in the same time slot using GMSK modulation, and the base station uses SIC (Successive Interference Cancellation, continuous) Interference cancellation or JD (Joint Detection) demodulates two multiplexed signals and distinguishes two users by different TSC ( Training Sequence Codes).

As shown in Figure 2, this figure illustrates how two terminals multiplex the same frequency point and time slot. When the ARFCN is 160, on the 3 slots, the base station sends two signals to the downlink, and uses the training sequence 0 and the training sequence 5 respectively. MS1 and MS2 use the training sequence to distinguish their own signals. In the uplink direction, MS1 and MS2 respectively send their own signals to the base station, and the base station distinguishes them by the training sequence, as shown by the solid line in Fig. 2; for signals that are not their own, the MS will process as interference, as shown in Fig. 2. The dotted line is shown.

After the introduction of the MUR0S, when two users multiplex, the two terminals multiplex one channel, and the base station transmits a signal like a QPSK signal. If the user is a SAIC (Single Antenna Interference Cancellation) terminal, the GMSK is used. Demodulation, the other signal is treated as interference; if the user is a MUR0S terminal (terminal supporting MUR0S), it is directly demodulated with QPSK.

When two terminals are multiplexed, because one of the terminals switches, or the wireless signal is not good, the multiplexing may be cancelled. At this time, the state is switched from multiplexing to non-multiplexing for the two terminals. . When a terminal is performing services, the network may assign another terminal to the same channel to be multiplexed with the terminal that is performing the service, so that the original terminal is At the end, the state is switched from no multiplexing to multiplexing. It can be understood that, for the terminal, when the network performs channel assignment after initiating the access, the demodulation mode of the terminal is also determined.

It is assumed that the terminal is directly demodulated using QPSK in the multiplexed state. If the state of the terminal is changed from multiplexed to unmultiplexed, the use of QPSK demodulation will result in the inability to demodulate. Since the base station transmits the signal to GMSK modulation at this time, the demodulation mode of the terminal needs to be adjusted from QPSK to GMSK demodulation.

It is assumed that the terminal is demodulated using GMSK in the non-multiplexed state. If the terminal state is changed from multiplexing to multiplexing at this time, the GMSK demodulation continues to be demodulated. Since the base station transmits the signal to QPSK modulation at this time, the demodulation mode of the terminal needs to be adjusted from GMSK demodulation to QPSK demodulation.

Therefore, the technical solution provided by the prior art may not be timely modified due to the demodulation mode of the terminal, so that the terminal cannot correctly demodulate the downlink data, which may cause service interruption. Summary of the invention

The problem to be solved by the embodiments of the present invention is to provide a method and apparatus for adjusting a demodulation mode, which can ensure that the terminal correctly demodulates the downlink data.

To achieve the above objective, an embodiment of the present invention provides a method for adjusting a demodulation mode, including:

Identifying whether the terminal multiplexing status has changed;

If the result of the identification is that the terminal multiplexing state is changed, the demodulation mode of the terminal is adjusted, and the adjusted demodulation mode is a demodulation mode corresponding to the changed multiplexing state.

On the other hand, an embodiment of the present invention further provides a terminal, including:

a detecting module, configured to detect the received signal;

An identification module, configured to determine a correct demodulation mode according to the detection result of the detection module, and identify a terminal multiplexing state corresponding to the correct demodulation mode; And an adjustment module, configured to adjust a demodulation manner according to the identification result of the identification module.

On the other hand, an embodiment of the present invention further provides a network device, including:

An identification module, configured to identify whether the terminal multiplexing status is changed;

And an adjusting module, configured to: when the identifying module identifies the terminal multiplexing state change, control the terminal to perform a demodulation mode adjustment.

The technical solution of the embodiment of the invention has the following advantages:

Because the method of demodulation adjustment is used, the corresponding demodulation mode is changed in time when the multiplexing state changes, so that the data can be correctly demodulated, the network communication effect is guaranteed, the guarantee of network transmission is improved, and the user is improved. Use experience. DRAWINGS

1 is a schematic diagram of two terminals working on the same radio resource in the background art;

2 is a schematic diagram of multiplexing the same frequency point or time slot between two terminals in the background art;

3 is a schematic flowchart of a method for adjusting a demodulation mode according to Embodiment 1 of the present invention; FIG. 4 is a schematic structural diagram of a terminal according to Embodiment 2 of the present invention;

5 is a schematic flowchart of a method for adjusting a demodulation mode according to Embodiment 3 of the present invention; FIG. 6 is a schematic structural diagram of a network device according to Embodiment 4 of the present invention;

FIG. 7 is a schematic flowchart of a method for adjusting a demodulation mode according to Embodiment 5 of the present invention; FIG. 8 is a schematic structural diagram of a network device according to Embodiment 6 of the present invention. detailed description

The embodiment of the present invention provides a method and a device for adjusting a demodulation mode, so as to avoid that when a MUR0S user terminal changes its multiplexing state after the MUR0S is introduced, the corresponding demodulation mode of the terminal cannot be changed in time, so that the terminal can The case where the base station receives the downlink data but cannot correctly demodulate it, causing the service to be interrupted.

The technical solution provided by the embodiment of the present invention firstly identifies whether the multiplexing state of the terminal is changed. If the result of the identification is that the terminal multiplexing state changes, the demodulation mode of the terminal is adjusted so that the adjusted demodulation mode is adapted to the changed multiplexing state.

Specifically, it can be implemented by the terminal side or by the network side.

The solution implemented by the terminal side is: the terminal performs blind detection on the received downlink signal to obtain a correct demodulation mode; determines the terminal multiplexing state corresponding to the correct demodulation mode by using the obtained demodulation mode; The terminal multiplexing state corresponding to the demodulation method is compared with the previous terminal multiplexing state, and it is recognized whether the terminal multiplexing state has changed. In addition, the terminal can be a terminal that supports MUR0S.

The solution implemented by the network side is: The network side identifies whether the terminal multiplexing status changes; if the terminal multiplexing status is changed, the network side sends a message or data carrying the multiplexing indication information to notify the terminal to perform the demodulation mode adjustment. The multiplexing indication information indicates whether the multiplexing state changes. Alternatively, the network side initiates intra-cell handover, and instructs the terminal to adjust according to the demodulation mode.

The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings and embodiments.

As shown in FIG. 3, it is a schematic flowchart of a method for adjusting a demodulation mode according to Embodiment 1 of the present invention, which includes the following steps:

Step S300: The terminal receives the signal.

The terminal accesses the network for voice service and acquires communication signals.

Step S 301, detecting the received signal.

The test referred to here specifically refers to blind detection.

The terminal performs blind detection every time it receives the downlink signal, and determines whether to use GMSK mode demodulation or QPSK mode demodulation by blind detection. It can be understood that the terminal can perform blind detection on each downlink speech frame.

Step S302: Identify the multiplexing state and its corresponding demodulation mode according to the detection result. The terminal automatically changes the demodulation mode, and tries to solve the solution by two demodulation methods: GMSK and QPSK. Adjust to know the correct demodulation method.

The specific process is as follows: The terminal first attempts to demodulate the received signal by means of GMSK. If successful, it determines that the demodulation mode of the signal is GMSK, and the multiplexing state is not multiplexed; if GMSK tries to demodulate If the method is unsuccessful, the demodulation mode is replaced, and the received signal is attempted to be demodulated by the QPSK method. If successful, the demodulation mode of the signal is determined to be QPSK, and the multiplexing state is multiplexing.

It should be further pointed out that the order of the demodulation modes mentioned in the above examples is only an example of the embodiment of the present invention, and the order of the demodulation methods in the blind detection process does not affect the implementation of the solution of the embodiment of the present invention. .

Step S303: Determine whether the multiplexing state and the corresponding demodulation mode identification result are consistent with the previous terminal multiplexing state.

When it is judged that the recognition result is consistent with the previous multiplexing state, the process proceeds to step S303;

When it is judged that the recognition result is inconsistent with the previous multiplexing state, the process proceeds to step S304.

Step S304: Maintain the current demodulation mode.

For convenience of explanation, for example:

If the recognition result in step S302 is multiplexed, the QPSK mode is demodulated, and the state of the previous terminal is also multiplexed, and the QPSK mode is demodulated, the state is not changed, the multiplex is maintained, and the QPSK mode is demodulated.

On the other hand, if the recognition result in step S302 is not multiplexed, the GMSK mode is demodulated, and the state of the previous terminal is also not multiplexed, and the GMSK mode is demodulated, the state is not changed, and the GMSK mode is maintained. Demodulation does not change.

Step S305: Adjust the current demodulation mode to a demodulation mode corresponding to the recognition result.

For convenience of explanation, for example ^ below:

If the recognition result in step S302 is not multiplexed, the GMSK mode is demodulated, and the state of the previous terminal is multiplexed, and the QPSK mode is demodulated, the state is changed, and the GMSK mode is demodulated. On the other hand, if the recognition result in step S302 is multiplexed, the QPSK mode is demodulated, and the state of the previous terminal is not multiplexed, and the GMSK mode is demodulated, the state is changed, the multiplex is changed, and the QPSK mode is demodulated. .

In the embodiment of the present invention, the method for blind detection is performed every time the terminal receives the downlink signal. When the modulation mode of the downlink data is changed due to the change of the multiplexing state of the MUR0S user, the terminal can correctly select the demodulation mode, thereby avoiding the user. The problem of not being able to demodulate correctly ensures the normal operation of the business.

In order to implement a method for adjusting a demodulation mode according to the first embodiment of the present invention, a second embodiment of the present invention provides a corresponding device. As shown in FIG. 4, it is a schematic structural diagram of a terminal according to Embodiment 2 of the present invention. , including:

a detecting module 41, configured to detect the received signal;

The identifying module 42 is configured to determine a correct demodulation mode according to the detection result of the detecting module 41, and identify a multiplexing state;

The adjusting module 43 is configured to adjust the demodulation mode according to the recognition result of the identification module 42.

The adjusting module 43 may further include:

a matching submodule 431, configured to match the identification result of the identification module 42 with the previous multiplexing state of the terminal;

The adjustment submodule 432 is configured to adjust the current demodulation mode according to the matching result of the matching submodule 431.

As shown in FIG. 5, it is a schematic flowchart of a method for adjusting a demodulation mode according to Embodiment 3 of the present invention, which includes the following steps:

Step S500: Send a signal to the terminal.

The terminal accesses the network for voice service, and the network sends a communication signal to the terminal.

Step S501: Whether the multiplexing state of the identification signal is changed, and notifying the terminal.

Specifically, the method for notifying the terminal may include: notifying the terminal to perform demodulation mode adjustment by sending a message or data including the multiplexing indication information. Understandably, the multiplexing state and end of the signal The reuse state of the end exists - the corresponding relationship.

The multiplexing indication information may specifically be a multiplexing indication bit added in a message or data sent to the terminal.

When the terminal multiplexed state is changed, the network sends the indicator to the terminal, and the indicator is carried in the signaling or the data to be sent, so as to notify the terminal to change the demodulation mode. After the terminal receives the indication bit sent by the network, Modify the modulation method accordingly.

The specific format can be: Multiuse indicator: X

The value of X is used to indicate whether the multiplexing state is changed, and the value is 1 or 0. When the value of X is 1, it indicates that the multiplexing state has changed. When X is 0, it indicates that the multiplexing state has not changed.

It should be further noted that the setting of the multiplexing indication information mentioned here is only one embodiment of the present invention, and the difference of the setting of the multiplexing indication information does not affect the implementation of the solution of the embodiment of the present invention.

Step S502: The terminal receives the multiplexing indication information, and identifies whether the multiplexing status is changed. The terminal receives the message or data including the multiplexing indication information, extracts the multiplexing indication information therefrom, and identifies whether the terminal multiplexing state changes.

When the change occurs, proceed to step S503;

When the change has not occurred, the process proceeds to step S504.

Specifically, referring to the setting of the multiplexing indication bit in the above step S501, the detailed process is explained as follows:

When the multiplexing indication bit received by the terminal is Multiuse indicator: 1, it indicates that the multiplexing state has changed; when the multiplexing indication bit received by the terminal is Multiuse indicator: 0, it indicates that the multiplexing state has not changed.

Step S503: Adjust a demodulation mode of the terminal.

Change the multiplexing status and change the corresponding demodulation method.

Specifically, referring to the setting of the multiplexing indication bit in the above step S501, the detailed process is explained as follows: When the multiplexing indication bit received by the terminal is Multiuse indicator: 1, it indicates that the multiplexing state has changed, and the demodulation mode needs to be changed.

If the state in the terminal is multiplexed and QPSK mode is demodulated, the state is changed, and the GMSK mode is demodulated.

If the status in the terminal is not multiplexed and GMSK is demodulated, the status is changed, and the multiplex is switched to QPSK mode demodulation.

Step S504: Maintain a demodulation mode of the terminal.

Keep the multiplexing state and the corresponding demodulation mode unchanged.

Specifically, referring to the setting of the multiplexing indication bit in the foregoing step S501, the detailed process includes: when the multiplexing indication bit received by the terminal is Multiuse indicator: 0, it indicates that the multiplexing state has not changed, and the demodulation mode does not need to be changed. .

For example, the state in the terminal is multiplexed, QPSK mode is demodulated, the state is not changed, and the multiplex is maintained, and the QPSK mode is demodulated unchanged;

For example, if the status in the terminal is not multiplexed, the GMSK mode demodulates, the state is not changed, and the GMSK mode is not demodulated.

In order to implement a method for adjusting a demodulation mode according to the third embodiment of the present invention, the fourth embodiment of the present invention further provides a corresponding device, as shown in FIG. 6, which is a network device according to Embodiment 4 of the present invention. Schematic diagram of the structure, including:

The identifying module 61 is configured to identify whether the terminal multiplexing status is changed.

The adjusting module 62 is configured to: when the identifying module identifies the terminal multiplexing state change, the control terminal performs the demodulation mode adjustment.

The adjusting module may further include:

The indication sending submodule 621 is configured to: when the identification module identifies the multiplexing state change of the terminal, send a message or data including the multiplexing indication information, and notify the demodulation mode adjustment.

FIG. 7 is a schematic flowchart of a method for adjusting a demodulation mode according to Embodiment 5 of the present invention, including the following steps: Step S700: Send a signal to the terminal.

Step S701: Identify whether the multiplexing status of the terminal is changed.

It is recognized whether or not the multiplexing state has changed. When a change has occurred, the process proceeds to step S702; when no change has occurred, the process proceeds to step S703.

Step S702: Initiating intra-cell handover, instructing the terminal to perform demodulation mode adjustment.

The network initiates intra-cell handover, which is equivalent to performing one channel reassignment to the terminal, and re-instructing the user channel state through channel reassignment, and the terminal can change the demodulation mode.

Step S 703: Keep the existing demodulation mode unchanged.

In order to implement a method for adjusting a demodulation mode according to the fifth embodiment of the present invention, the sixth embodiment of the present invention further provides a corresponding device, as shown in FIG. 8 , which is a network device according to Embodiment 6 of the present invention. Schematic diagram of the structure, including:

The identifying module 81 is configured to identify whether the terminal multiplexing status is changed.

The adjusting module 82 is configured to: when the identifying module identifies the terminal multiplexing state change, the control terminal performs the demodulation mode adjustment.

The adjustment module 82 further includes:

The channel re-sub-module 821 is configured to perform channel re-assignment, indicate channel state change, adjust demodulation mode, initiate intra-cell handover, and indicate that the terminal performs demodulation mode adjustment when the identification module recognizes the terminal multiplexing state change.

The technical solution of the embodiment of the present invention has the following advantages, because the multiplexing state identification and adjustment method is adopted, and when the multiplexing state change occurs, the terminal timely recognizes and changes the corresponding demodulation mode, thereby ensuring signals or data. It can correctly demodulate, ensure the network communication effect, improve the guarantee of network transmission, and improve the user experience.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software plus a necessary general hardware platform, and of course, can also be through hardware, but in many cases, the former is a better implementation. the way. Based on such understanding, the technique of the present invention The portion of the program that contributes in essence or to the background art may be embodied in the form of a software product stored in a storage medium, including instructions for causing a terminal device (which may be a mobile phone, a personal A computer, server, or network device, etc.) performs the methods described in various embodiments of the present invention. It should be noted that the above embodiments are only for explaining the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail 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 are modified, or some of the technical features are equivalently replaced. The modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

Claim

A method for adjusting a demodulation method, comprising:

Identifying whether the terminal multiplexing status has changed;

2. The method for adjusting a demodulation mode according to claim 1, wherein the identifying whether the multiplexing state of the terminal changes comprises:

The terminal performs blind detection on the received downlink signal to obtain a correct demodulation mode; and identifies a terminal multiplexing state corresponding to the correct demodulation mode;

Comparing the terminal multiplexing state corresponding to the correct demodulation mode with the multiplexing state before the terminal, it is recognized whether the terminal multiplexing state has changed.

The demodulation mode adjustment method according to claim 2, wherein if the correct demodulation mode is Gaussian minimum frequency shift keying GMSK, the corresponding terminal reuse state is not multiplexed;

If the correct demodulation mode is quadrature phase shift keying QPSK, the corresponding terminal multiplexing state is multiplexing.

The method for adjusting a demodulation mode according to claim 1, wherein the identifying whether the multiplexing state of the terminal changes comprises:

The network side identifies whether the terminal multiplexing status has changed.

The method for adjusting a demodulation mode according to claim 4, wherein the adjusting the demodulation mode of the terminal comprises:

The network side notifies the terminal to perform demodulation mode adjustment by sending a message or data carrying the multiplexing indication information, where the multiplexing indication information indicates whether the multiplexing state is changed.

The method for adjusting a demodulation mode according to claim 4, wherein the adjusting the demodulation mode of the terminal comprises: The network side initiates intra-cell handover, and instructs the terminal to adjust according to the demodulation mode.

The method for adjusting a demodulation method according to any one of claims 1 to 6, wherein the terminal supports multi-user multiplexing of the same time slot MUR0S.

8. A terminal, comprising:

a detecting module, configured to detect the received signal;

An identification module, configured to determine a correct demodulation mode according to the detection result of the detection module, and identify a terminal multiplexing state corresponding to the correct demodulation mode;

And an adjustment module, configured to adjust a demodulation manner according to the identification result of the identification module.

The terminal according to claim 8, wherein the adjustment module specifically includes:

a matching submodule, configured to match the identification result of the identification module with a multiplexing state before the terminal;

The adjustment submodule is configured to adjust a demodulation manner of the terminal when the matching result of the matching submodule is inconsistent.

The terminal according to claim 8 or 9, wherein if the correct demodulation mode is Gaussian minimum frequency shift keying GMSK, the corresponding terminal multiplexing state is not multiplexed; The correct demodulation mode is four-phase phase shift keying QPSK, and the corresponding terminal multiplexing state is multiplexing.

The terminal according to claim 10, wherein the terminal supports multiple users to multiplex the same time slot MUR0S.

12. A network device, comprising:

The network device according to claim 12, wherein the adjustment module Includes:

a first sub-module, configured to: when the identifying module identifies the change of the multiplexing state of the terminal, send a message or data that includes the multiplexing indication information, notify the terminal to perform a demodulation mode adjustment, where the multiplexing indication information indicates multiplexing Whether the status has changed.

The network device according to claim 12, wherein the adjustment module comprises:

And a second submodule, configured to: when the identifying module identifies the terminal multiplexing state change, initiate an intra-cell handover, and instruct the terminal to perform a demodulation mode adjustment.