WO2010057389A1

WO2010057389A1 - Method for solving carrier interference when a terminal is high-speed moving

Info

Publication number: WO2010057389A1
Application number: PCT/CN2009/073331
Authority: WO
Inventors: 韩小江; 赵刚; 杨卓; 易鸿锋
Original assignee: 中兴通讯股份有限公司
Priority date: 2008-11-24
Filing date: 2009-08-18
Publication date: 2010-05-27
Also published as: CN101742607B; CN101742607A

Abstract

A method for solving carrier interference when a terminal is high-speed moving is provided. Implementation steps are as follows: the terminal reports the communication quality fed back from the received information or the detected moving speed of the terminal to the system (201); the system judges whether the terminal is a high-speed moving terminal according to the communication quality fed back from the terminal or the moving speed reported from the terminal (202); when the terminal is a high-speed moving terminal, the system allocates the resource for the terminal according to the resource allocation method of the high-speed moving terminal, at the same time transmits the signaling including the resource allocation indication mode of the high-speed moving terminal to the terminal (203); the system and the terminal according to the signaling of the resource allocation indication mode in the signaling, allocate the resource for the data with the resource allocation method corresponding to the resource allocation indication mode and transmit; the receiver receives and reads the data according to the resource allocation method corresponding to the resource allocation indication mode (204). The method reduces subcarrier interference by allocating the reasonable resource for the high-speed moving terminal, so that the higher moving speed can be supported by the terminal, and the communication quality of the terminal which is high speed moving is improved.

Description

Method for solving carrier interference in high-speed mobile terminal

The present invention relates to the field of wireless communication technologies, and in particular, to a method for solving a carrier bandwidth in a terminal.

Background technique

As the requirements for the communication quality of modern wireless communication systems continue to increase, it is imperative to maintain normal communication and good communication quality at the high-speed mobile terminals. The 3G standard requires that the maximum mobile speed that the mobile terminal can support is 200km/h, and the requirement of the 4G standard is that the maximum mobile speed that the mobile terminal can support is 500km/h, so that users in multiple high-speed scenarios can communicate normally. Therefore, in 3G, 4G and later systems, high-speed terminals are a common terminal group in the system. Therefore, it is very important to solve the interference between high-speed mobile terminals to ensure communication quality.

In the current wireless communication system, for a high-speed mobile terminal, the normal communication of the terminal moving at a certain speed is satisfied by changing the MCS (modulation coding table) of the terminal data.

The existing wireless communication system supports the terminal's moving speed to be limited, and the terminal's moving speed is mainly reflected in parameters such as the bit error rate of the terminal decoding. When the terminal fails to decode several times in succession, the terminal feeds back the decoding situation to the base station, and the base station lowers the MCS and then attempts to transmit until it is adjusted to the lowest level MCS. Decoding failure caused by high-speed movement is mainly caused by inter-subcarrier interference and frequency offset of the receiving channel. Subcarrier interference and frequency offset problems cannot be directly eliminated by the reduction of MCS. Therefore, the method of reducing the MCS supports the terminal's movement speed is very limited.

For the communication system based on OFDM (Orthogonal Frequency-Division Multiplexing) technology, the resource allocation is allocated according to the RB, and the data on the subcarriers of the system is continuously distributed, and the individual subcarriers cannot be determined. The interval of subcarriers is flexibly changed. Therefore, the current resource allocation method cannot meet the requirements for supporting the work of high-speed mobile terminals.

In summary, the existing processing methods cannot meet the normal operation of the terminal with higher moving speed. Summary of the invention

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for solving carrier interference in a high-speed mobile terminal, which satisfies the normal operation of a terminal with a higher moving speed.

In order to achieve the above problem, the present invention provides a method for solving carrier interference in high-speed mobile terminal, which includes the following steps:

The terminal feeds back the communication quality to the system according to the received information or reports the detected moving speed of the terminal to the system;

Determining, by the system, whether the terminal is a high-speed mobile terminal according to the communication quality fed back by the terminal or the reported moving speed;

When the terminal is a high speed mobile terminal,

The system allocates resources to the terminal according to the resource allocation method of the high-speed mobile terminal, and simultaneously transmits signaling including the resource allocation indication mode of the high-speed mobile terminal to the terminal;

And the system and the terminal allocate, according to the resource allocation indication mode in the signaling, a resource allocation method corresponding to the resource allocation indication mode, to allocate data to the data, and send the data, where the receiver receives and responds according to the resource allocation indication mode. The resource allocation method reads the data.

The method of the present invention, wherein

The terminal periodically or non-periodically reports the communication quality to the system according to the received information, or reports the moving speed of the terminal periodically or aperiodically to the system, where the terminal only reports the moving speed of the system. Commanding a non-periodic feedback to the system based on the received information or periodically detecting the moving speed of the detected terminal to the system;

The system determines whether the terminal is a high-speed mobile terminal according to the communication quality fed back by the terminal or the reported moving speed.

The method of the present invention, wherein resources of a dynamic terminal resource are idle and interpolated or cleared to zero or two of two subcarriers of the subcarrier of the resource, and data is carried on the subcarriers of the remaining resources. At the intersection of the resources allocated to the terminal and the resources of the low speed mobile terminal, one or more subcarriers are idle and interpolated or cleared.

The method according to the present invention, wherein the system is based on a channel quality indication fed back by the terminal, Determining the feedback of the terminal or denying the feedback of the terminal, and determining whether the terminal is a high-speed mobile terminal according to the current modulation coding table of the terminal and whether the handover condition is met; or

The system determines a threshold of a moving speed, and determines, according to the threshold, whether the moving speed of the terminal is greater than the threshold, to determine whether the terminal is a high-speed mobile terminal; wherein the threshold is a system through simulation or analysis. The threshold is determined.

In the above method, when the terminal is a high speed mobile terminal,

The system allocates resources to the terminal according to the downlink resource allocation method of the high-speed mobile terminal, and the system sends signaling including the downlink resource allocation indication mode of the high-speed mobile terminal to the terminal through the control channel, and the downlink resource allocation of the high-speed mobile terminal The signaling of the indication mode includes an interval idle subcarrier number parameter for allocating subcarriers;

The system uses the downlink resource allocation method corresponding to the downlink resource allocation indication mode to allocate resources to the data to be sent to the terminal, and completes the data baseband processing, and then sends the data through the radio frequency; and the terminal receives the data for baseband solution processing. And converting the data into the frequency domain data, and determining, according to the downlink resource allocation indication mode of the high-speed mobile terminal in the received signaling, the frequency domain data resource allocation, if the frequency domain data is in accordance with the downlink of the high-speed mobile terminal. If the downlink resource allocation method corresponding to the resource allocation indication mode is allocated by the subcarrier, the terminal reads the frequency domain data at intervals of the number of free subcarriers used for allocating the subcarriers carrying the data, if If not, the terminal reads the frequency domain data in a normal downlink resource allocation method.

In the above method, the signaling of the downlink resource allocation indication mode of the high speed mobile terminal further includes a resource block allocated to the terminal.

In the above method, when the terminal is a high speed mobile terminal,

The system allocates resources to the terminal according to the uplink resource allocation method of the high-speed mobile terminal, and the system sends the authorization indication signaling of the uplink resource allocation indication mode of the high-speed mobile terminal to the terminal through the control channel or the downlink shared channel, where the high-speed The signaling of the uplink resource allocation indication mode of the mobile terminal includes an interval free subcarrier number parameter for allocating subcarriers;

After receiving the authorization indication signaling, the terminal uses an uplink resource allocation method corresponding to the uplink resource allocation indication mode to map data to be sent to the system, and completes the data baseband processing, and then sends the data through the radio frequency; After receiving the data, the system converts the data into frequency domain data, and determines the frequency domain according to the signaling of the uplink resource allocation indication mode of the high-speed mobile terminal in the authorization indication signaling sent to the terminal. a data resource allocation situation, if the frequency domain data is carried according to an uplink resource allocation method corresponding to an uplink resource allocation indication mode of the high speed mobile terminal, the system is configured to allocate a subcarrier carrying the data. The number of spaced idle subcarriers is read for the frequency domain data, and if not, the system reads the frequency domain data by a common uplink resource allocation method.

Further, in the foregoing method, the signaling of the uplink resource allocation indication mode of the high-speed mobile terminal further includes a resource block allocated to the terminal;

The baseband processing includes an inverse Fourier transform, a cyclic prefix, a framing, and an antenna configuration hierarchy; the baseband processing includes a Fourier transform, an inverse Fourier transform, a cyclic prefix, a framing, and an antenna configuration hierarchy.

Compared with the prior art, the present invention enables the terminal to support higher moving speed, reduce subcarrier interference, and improve communication quality.

BRIEF abstract

1 is a schematic diagram of subcarrier allocation with subcarrier spacing of 1 in the method according to the present invention; FIG. 2 is a flowchart of a method for resolving carrier interference in high speed mobile of a terminal according to the present invention; A flowchart of downlink processing for supporting a high-speed mobile terminal; FIG. 4 is a flowchart of uplink processing for supporting a high-speed mobile terminal in the method of the present invention.

Preferred embodiment of the invention

The detailed description is not to be construed as limiting the invention.

The system directly reports its own moving speed. The system selects different resource allocation methods according to the moving speed information of the terminal, and sends information such as signaling to the terminal through the control channel to allocate resources to the terminal, so as to realize the communication problem of the terminal supporting the high-speed mobile. As shown in FIG. 1, the resource allocation method of the high-speed mobile terminal of the present invention is mainly as follows: Step 1: The resources allocated by the system to the high-speed mobile terminal are twice or multiple, and are allocated to both sides of each subcarrier of the high-speed mobile terminal resource. Two or more subcarriers are idle and interpolated or cleared to zero. Connect, idle one carrier or multiple carriers and interpolate or clear to zero.

The interference between subcarriers is reduced by step 1 corresponding to the subcarrier spacing of the high-speed mobile terminal being twice or more, and the subcarrier interference between the high-speed mobile terminal and the low-speed mobile terminal is solved by the second step.

As shown in FIG. 2, it is a flowchart of a method for solving carrier interference in a high-speed mobile terminal according to an embodiment of the present invention, and the specific steps are as follows:

Step 201: The terminal periodically or non-periodically transmits the communication quality of the received information feedback or the detected moving speed of the terminal to the system;

Step 202: The system determines, according to the communication quality fed back by the terminal or the reported moving speed, whether the terminal is a high-speed mobile terminal;

Step 203: When the terminal is a high-speed mobile terminal, the system allocates resources to the terminal according to the resource allocation method of the high-speed mobile terminal, and simultaneously sends a signal including the resource allocation indication mode of the high-speed mobile terminal to the terminal;

The signaling of the resource allocation indication mode described herein is used to notify the receiver that the high-speed mobile processing mode is used for this transmission. The signaling of the resource allocation indication mode includes at least the interval free subcarrier number parameter of the subcarrier allocation, and may further include other parameters, and the other parameters mainly refer to parameters in the common resource allocation indication method, including the RB allocated to the terminal. (resource block, resource block) and other parameters;

Step 204: The system and the terminal send, according to the resource allocation indication mode in the signaling, a resource allocation method corresponding to the resource allocation indication mode, after the resource is allocated, and the receiver receives and follows the resource allocation indication mode. The resource allocation method reads the data.

Based on the method in the foregoing embodiment, the present invention may specifically solve the carrier interference problem in the high-speed mobile terminal based on the uplink and downlink resource allocation methods. As shown in FIG. 3, it is a flowchart of downlink processing for supporting a high-speed mobile terminal in a method for solving carrier interference in high-speed mobile of a terminal according to an embodiment of the present invention, and the specific steps are as follows:

Step 301: The terminal reports the communication quality of the received information feedback or the detected moving speed of the terminal to the system periodically or aperiodically, wherein the terminal reports the non-periodic report only when receiving the command to report the moving speed. ;

Step 302: The system determines, according to the communication quality fed back by the terminal or the reported moving speed, whether the terminal is a high-speed mobile terminal;

Among them, there are two kinds of judgment basis:

The first type is based on the CQI (channel quality indication) of the terminal, the ACK (Acknowledgement) of the terminal feedback, or the NACK (Negative Acknowledgement) of the terminal feedback or the terminal moving speed of the terminal measurement feedback. Parameter, and combining the current MCS table of the terminal and whether the handover condition is met to determine whether the terminal is a high-speed mobile terminal;

For example: When the terminal is at the lowest MCS and the feedback is NACK and the handover condition is not met, the terminal is defined as a high-speed mobile terminal.

Secondly, the system determines a moving speed threshold. If the system determines 200Km/H as the moving speed threshold according to the simulation or analysis, and determines whether the moving speed reported by the terminal is greater than the threshold according to the threshold, it is determined whether the terminal is High-speed mobile terminal.

Step 303: When the terminal is a high-speed mobile terminal, the system sends, by using a control channel, signaling that includes a downlink resource allocation indication mode of the high-speed mobile terminal, where the signaling of the downlink resource allocation indication mode of the high-speed mobile terminal includes the subcarrier. The allocated interval idle subcarrier number parameter; based on the above resource allocation method, the control signaling required to increase the downlink resource allocation indication mode in the signaling sent by the control channel is specifically used for the high speed mobile terminal The resource allocation indication includes at least a downlink resource allocation indication mode of the high speed mobile terminal, and may also include other control signaling. For example, in the LTE (Long Term Evolution) system, three resource allocation indication modes are now determined. Now, a resource allocation indication mode is also added. As the fourth mode, the resource allocation according to any of the first three types of allocation is added, and at the same time, one parameter is added: the number of spare subcarriers of the subcarrier allocation interval. The fourth mode is only used for resource allocation of high speed mobile terminals. At the same time, several resource allocation modes in the LTE system correspond to their downlinks. Several modes of the control channel (PDCCH), therefore, an increased resource allocation indication mode signaling, and a resource allocation corresponding to a resource allocation method of the high-speed mobile terminal;

Step 304, completing data baseband processing, and transmitting information;

The system uses a downlink resource allocation method corresponding to the downlink resource allocation indication mode to allocate resources to the data to be sent to the terminal, and completes the data baseband processing, and then transmits the data through the radio frequency;

The baseband processing here includes: IFFT (anti-Fourier transform), force. CP (circle prefix, cyclic prefix), framing and antenna configuration grading;

The steps of the downlink resource allocation method are the same as those in the foregoing resource allocation method; Step 305, the terminal receives and reads data;

After receiving the data by the radio frequency, the terminal converts the data into frequency domain data, and determines the frequency domain data resource allocation according to the signaling of the downlink resource allocation indication mode of the high-speed mobile terminal in the received signaling. The frequency domain data is carried according to the downlink resource allocation method corresponding to the downlink resource allocation indication mode of the high speed mobile terminal, and the terminal allocates the number of free subcarriers allocated by the data subcarrier as an interval. The frequency domain data is read. If not, the terminal reads the frequency domain data in a normal downlink resource allocation method.

As shown in FIG. 4, it is a flowchart for supporting uplink processing of a high-speed mobile terminal in a method for solving carrier interference in high-speed mobile of a terminal according to an embodiment of the present invention, and the specific steps are as follows:

Step 401: The terminal reports the communication quality of the received information feedback or the detected moving speed of the terminal to the system periodically or aperiodically, wherein the terminal only reports the non-periodic report when receiving the command for reporting the moving speed of the system. ;

Step 402: The system determines, according to the communication quality fed back by the terminal or the reported moving speed, whether the terminal is a high-speed mobile terminal; the judgment is the same as step 302;

Step 403: When the terminal is a high-speed mobile terminal, the system sends, by using a control channel or a downlink shared channel, an authorization indication signaling that includes an uplink resource allocation indication mode of the high-speed mobile terminal, and the uplink resource allocation indication mode of the high-speed mobile terminal The command includes an interval idle subcarrier number parameter of the subcarrier allocation; the authorization indication signaling is used to command the terminal to map the bearer data by using a resource allocation method of the high speed mobile terminal on the allocated resource;

Step 404, complete data baseband processing, and send information. After receiving the authorization indication signaling, the terminal uses an uplink resource allocation method corresponding to the uplink resource allocation indication mode to perform mapping bearer for data to be sent to the system, and completes the data baseband processing, and then sends the data through the radio frequency;

The step 404 is further, after the terminal receives the authorization indication signaling, determining whether the terminal is a high-speed mobile terminal according to the communication quality fed back by the system or the reported moving speed, and if yes, the terminal passes the authorization indication letter. The uplink resource allocation method for the medium and high speed mobile terminal is to perform mapping bearer on the data to be sent to the system, and complete the data baseband processing, and then send the data through the radio frequency;

The steps of the uplink resource allocation method herein are the same as those in the resource allocation method described above; the baseband processing herein includes: FFT (Fourier Transform), IFFT, and force. CP, framing, and antenna configuration grading;

Here, the condition for determining whether the terminal is a high-speed mobile terminal is the same as step 302 described above; in step 405, the system receives and reads data;

The system receives the data through the radio frequency for baseband de-processing, converts the data into frequency domain data, and determines the frequency domain data resource according to the signaling of the uplink resource allocation indication mode of the high-speed mobile terminal in the authorization indication signaling sent to the terminal. The allocation case, if the frequency domain data is carried according to the uplink resource allocation method corresponding to the uplink resource allocation indication mode of the high-speed mobile terminal, the number of idle subcarriers allocated by the system to carry the data subcarrier allocation The frequency domain data is read for the interval. If not, the system reads the frequency domain data in a normal uplink resource allocation method.

Compared with the prior art, the method described in the embodiment of the present invention has the beneficial effects of: a method for supporting a higher moving speed of the terminal, reducing subcarrier interference, and improving communication quality. The present invention basically eliminates the problem of subcarrier interference caused by high-speed movement of the terminal and mutual interference of uplink state terminals. The communication quality of the system is greatly improved. The invention solves the problem that the system supports high-speed movement of the terminal and ensures the communication quality, and the method of the invention is simple and the complexity is relatively low.

It is a matter of course that the invention may be embodied in various other forms and modifications without departing from the spirit and scope of the invention. Industrial applicability

By using the method proposed by the present invention, by reducing subcarrier interference, the terminal can support a higher moving speed, thereby improving the communication quality of the terminal in high speed movement.

Claims

Claim

A method for solving carrier interference in a high-speed mobile terminal, comprising the following steps: the terminal feeds back the communication quality to the system according to the received information or reports the detected moving speed of the terminal to the system;

Determining, by the system, whether the terminal is a high-speed mobile terminal according to a communication quality fed back by the terminal or a reported moving speed;

When the terminal is a high speed mobile terminal,

Transmitting signaling to the terminal including a resource allocation indication mode of the high speed mobile terminal;

One of the system and the terminal allocates a resource for data according to a resource allocation indication mode in the signaling, and allocates the data by using a resource allocation method corresponding to the resource allocation indication mode, where the system and the terminal The other one receives and reads the data according to a resource allocation method corresponding to the resource allocation indication mode.

2. The method of claim 1 wherein

The terminal periodically or non-periodically reports the communication quality to the system according to the received information, or reports the detected moving speed of the terminal periodically or aperiodically to the system, where the terminal only receives the system. When the command for moving the speed is reported, the communication quality is reported to the system aperiodically according to the received information, or the detected moving speed of the terminal is reported to the system aperiodically;

3. The method of claim 2, wherein

a resource of a mobile terminal resource, which is idle and interpolated or cleared to two or more subcarriers on two sides of the subcarrier of the resource, and carries data on the subcarriers of the remaining resources, and resources allocated to the terminal At the intersection with the resources of the low-speed mobile terminal, one or more subcarriers are idle and interpolated or cleared.

4. The method according to claim 2, wherein the step of determining, by the system, whether the terminal is a high-speed mobile terminal according to the communication quality fed back by the terminal or the reported moving speed comprises: the system according to the Determining, by the terminal, the channel quality indication, the acknowledgement of the terminal feedback, or the denial of the terminal feedback, determining whether the terminal is a high-speed mobile terminal according to the current modulation and coding table of the terminal and whether the handover condition is met; Or

Determining, by the threshold, a threshold of a moving speed, determining, according to the threshold, whether the moving speed reported by the terminal is greater than the threshold, to determine whether the terminal is a high-speed mobile terminal; wherein the threshold is determined by simulation or analysis of.

5. The method of claim 2, 3 or 4, wherein

When the terminal is the high speed mobile terminal,

The steps of transmitting signaling including a resource allocation indication mode of a high speed mobile terminal to the terminal include:

At the same time, the system sends signaling including a downlink resource allocation indication mode of the high-speed mobile terminal to the terminal by using a control channel, where the signaling of the downlink resource allocation indication mode including the high-speed mobile terminal includes an idle interval for allocating subcarriers. Subcarrier number parameter;

One of the system and the terminal allocates a resource for data according to a resource allocation indication mode in the signaling, and allocates the data by using a resource allocation method corresponding to the resource allocation indication mode, where the system and the terminal The other step of receiving and reading the data according to the resource allocation method corresponding to the resource allocation indication mode includes:

The system uses a downlink resource allocation method corresponding to the downlink resource allocation indication mode to allocate resources to the data to be sent to the terminal, complete baseband processing of the data, and process the baseband processed data. Transmitted by radio; and

Receiving, by the terminal, the data, performing baseband decompression processing on the baseband processed data, and converting the baseband decomposed data into frequency domain data, according to the received downlink including the high speed mobile terminal The signaling of the resource allocation indication mode determines the frequency domain data resource allocation situation, if the frequency domain data is in accordance with the downlink resource allocation indication mode of the high speed mobile terminal. If the row resource allocation method allocates the subcarriers to be carried, the terminal reads the frequency domain data at intervals of the number of free subcarriers for allocating the subcarriers carrying the data, and if not, the The terminal reads the frequency domain data in a normal downlink resource allocation method.

6. The method of claim 5, wherein

The signaling including the downlink resource allocation indication mode of the high speed mobile terminal further includes a resource block allocated to the terminal.

7. The method of claim 5, wherein

The baseband processing includes an inverse Fourier transform, a cyclic prefix, a framing, and an antenna configuration hierarchy.

8. The method of claim 2, 3 or 4, wherein

When the terminal is the high speed mobile terminal,

The step of transmitting signaling including the resource allocation indication mode of the high speed mobile terminal to the terminal includes:

The system allocates resources to the terminal according to the uplink resource allocation method of the high-speed mobile terminal, and the system sends the authorization indication signaling including the uplink resource allocation indication mode of the high-speed mobile terminal to the terminal through the control channel or the downlink shared channel. The authorization indication signaling includes an interval idle subcarrier number parameter for allocating subcarriers;

After receiving the authorization indication signaling, the terminal uses an uplink resource allocation method corresponding to the uplink resource allocation indication mode, performs mapping on data to be sent to the system, completes baseband processing of the data, and Transmitting the baseband processed data by radio frequency; and

Receiving, by the system, the baseband processed data, performing baseband decompression processing on the baseband processed data, and converting the baseband decomposed data into frequency domain data, according to the uplink The resource allocation indication mode determines a resource allocation situation of the frequency domain data, if the frequency domain data is allocated according to an uplink resource allocation method corresponding to the uplink resource allocation indication mode If the wave is carried, the system reads the frequency domain data at intervals of the number of free idle subcarriers for allocating the subcarriers carrying the data, if the frequency domain data is not according to the uplink. If the uplink resource allocation method corresponding to the resource allocation indication mode is allocated by the subcarrier, the system reads the frequency domain data by using a common uplink resource allocation method.

9. The method of claim 8 wherein

The signaling of the uplink resource allocation indication mode including the high speed mobile terminal further includes a resource block allocated to the terminal.

10. The method of claim 8 wherein

The baseband processing includes Fourier transform, inverse Fourier transform, plus cyclic prefix, framing, and antenna configuration grading.