WO2012163151A1

WO2012163151A1 - Method for coordinating sub-frame configuration between tdd cells and device thereof

Info

Publication number: WO2012163151A1
Application number: PCT/CN2012/072948
Authority: WO
Inventors: 潘学明; 沈祖康; 徐婧
Original assignee: 电信科学技术研究院
Priority date: 2011-05-31
Filing date: 2012-03-23
Publication date: 2012-12-06
Also published as: CN102215534A; CN102215534B

Abstract

Disclosed are a method for coordinating sub-frame configuration between Time Division Duplexing (TDD) cells and a device thereof. The method comprises: a cell of a source TDD base station performing alteration determination of sub-frame configuration for a cell of a current base station, and when the determination is that the sub-frame configuration of the cell of the current base station needs to be altered, sending a sub-frame configuration alteration request to a cell of an adjacent target TDD base station; and the cell of the source TDD base station receiving feedback information, returned by the cell of the target TDD base station, indicating whether to accept the sub-frame configuration alteration request, and setting the sub-frame configuration of the cell of the current base station correspondingly according to the feedback information. The present invention can improve the flexibility of the sub-frame configuration.

Description

TDD inter-cell subframe configuration coordination method and device thereof The present application claims to be submitted to the Chinese Patent Office on May 31, 2011, the application number is 201110144583.1, and the invention name is "a TDD small-interval subframe configuration coordination method and device thereof" The priority of the Chinese Patent Application, the entire contents of which is incorporated herein by reference. Technical field

The present invention relates to the field of wireless communication technologies, and in particular, to a TDD inter-cell subframe configuration coordination method and apparatus therefor. Background technique

As one of the two basic duplex systems, the TDD (Time Division Duplexing) mode has received more and more attention in the context of the increasing bandwidth demand for broadband mobile communications.

For the basic duplex mode adopted by the cellular system, the TDD mode means that the uplink and downlink use the same working frequency band, and the uplink and downlink signals are transmitted at different time intervals, and there is a guard interval between the uplink and the downlink (Guard Period). FDD (Frequency Division Duplexing) mode refers to the use of different working frequency bands on the uplink and downlink. It can transmit uplink and downlink signals on different frequency carriers at the same time, and there is protection between uplink and downlink. Guard Band. Common TDD systems include 3G TD-SCDMA (Time Division-Synchronous Code Division Multiple Access) systems and 4G TD-LTE (Long Term Evolution TD-SCDMA) systems.

The frame structure of the LTE TDD system (Long Term Evolution TDD system) is slightly more complicated. As shown in FIG. 1 , a radio frame has a length of 10 ms, and includes 10 subframes of a special subframe and a regular subframe, and each subframe is 1 ms. The special subframe is divided into three slots: DwPTS, GP, and UpPTS, where DwPTS is used to transmit PSS/PDCCH/PHICH/PCFICH/PDSCH, etc., and GP is used between downlink and uplink. The guard interval, UpPTS is used to transmit SRS/PRACH. The regular subframe includes an uplink subframe and a downlink subframe, and is used for transmitting uplink/downlink control signaling, service data, and the like. Wherein, in one radio frame, two special subframes (located in subframes #1 and #6) or a special subframe (located in subframe #1) may be configured. Subframe #0 and subframe #5 and DwPTS slots in special subframes are always used for downlink transmission, and subframes #2 and UpPTS slots in special subframes are always used for uplink transmission, and other subframes can be used as needed. Configured to be used for upstream or downstream transmission.

In the TD-LTE system, the sum of the three time slots of the DwPTS/GP/UpPTS in the special subframe is lms, and the three slot length divisions support different configurations. As shown in Table 1, the time length unit in the table is Ts. , 1 = (诵x 2048, .

Table 1. Configuration format of TD-LTE special subframe

Configuration extended CP

GP EfevPT3⁄4 GP UpPTS

0 21560,5

2Γ, 21 Outline ' 2; ?诵 20 shed ' 7

1

: ? Outline "7

'

2

23040 -:7 _S

3

24144 - standard 4-7; ism- T,

4

2633 , T _s 2192- 1792Q'T _S

5 6592 T _z 4384. I; 20柳':; 5120 ·Γ ₃

6

1 said 0 ' r _s speak 40' ism -T _s

7

- - -

8

24144 - ;7 - -

The uplink and downlink subframe allocation in TD-LTE supports 7 different modes. The specific configuration parameters are as shown in Table 2 below. D indicates that it is used for downlink transmission, U indicates that it is used for uplink transmission, and S indicates that the subframe is a special subframe, including DwPTS, GP and UpPTS three parts.

Table 2. LTE TDD uplink and downlink subframe configuration format

The division of the uplink and downlink time slots is static or semi-static. Generally, in the network planning process, the uplink and downlink time slot ratios are determined and remain unchanged according to the cell type and the approximate service ratio. The special subframe configuration and the above-mentioned special subframe configuration The line subframe allocation mode is broadcast to all users in the cell through System Information (SI). This is a relatively simple approach in the context of large coverage of macro cells, and is also more effective. With the development of technology, more and more low-power base stations such as Pico cells and Home NodeBs are deployed to provide local small coverage. In such cells, the number of users is small, and The user service requirements vary greatly. Therefore, there is a dynamic change in the proportion of uplink and downlink services in the cell.

Currently, the TD-LTE standard supports online change of the uplink and downlink time slot ratio of a cell, such as changing the above two frame configuration parameters by means of System Information Change. However, this change requires a process of paging and re-reading system information, and there are some ambiguities before and after the change. For example, if the frame configuration changes frequently, the system performance is seriously degraded, and HARQ (Hybrid Automatic Repeat Request, hybrid) Automatic retransmission requests) operations and scheduling, etc., adversely affect. Moreover, the minimum frame configuration change period supported by the TD-LTE standard is 640 ms, which is not flexible enough to fully adapt to the dynamic change of the service. Summary of the invention

Embodiments of the present invention provide a TDD inter-cell subframe configuration coordination method and apparatus thereof for improving subframe configuration flexibility.

The TDD inter-cell subframe configuration coordination method provided by the embodiment of the present invention includes: the source TDD base station cell performs a subframe configuration change decision on the base station cell, and when it is determined that the subframe configuration change needs to be performed on the base station cell, the adjacent The target TDD base station cell sends a subframe configuration change request;

The source TDD base station cell receives the feedback information of the target TDD base station cell to receive the subframe configuration change request, and performs corresponding setting of the subframe configuration on the base station cell according to the feedback information.

The base station provided by the embodiment of the present invention is applied to a TDD system, and includes:

a first decision module, configured to perform a subframe configuration change decision on the base station cell when the base station is the source base station, and send the subframe to the adjacent target base station when the subframe configuration change is required to be performed on the base station cell Frame configuration change request;

a second determining module, configured to determine, according to the base station as the target base station, whether to accept a subframe configuration change request of the source base station;

a feedback module, configured to: when the base station is the target base station, return, to the source base station, whether to accept the feedback information of the subframe configuration change request;

The configuration module is configured to perform, according to whether the base station returns the feedback information of the subframe configuration change request, according to the feedback information of the subframe configuration change request returned by the target base station, and perform corresponding setting of the subframe configuration on the base station cell.

In the foregoing embodiment of the present invention, the source TDD base station cell sends a subframe change configuration request to the adjacent target TDD base station cell when the subframe configuration change is required, so that the target TDD base station cell accepts the subframe change configuration request. The decision is made and the feedback information of the request is accepted. The source TDD base station cell sets the subframe configuration of the base station cell according to the feedback information, thereby improving the subframe configuration flexibility. DRAWINGS 1 is a schematic diagram of a frame structure of a TD-LTE system in the prior art;

2 is a schematic diagram of a dynamic uplink-downlink subframe allocation scheme according to an embodiment of the present invention; FIG. 3 is a schematic diagram of TDD cross-slot interference;

4 is a schematic diagram of a TDD inter-cell subframe configuration coordination process according to an embodiment of the present invention;

FIG. 5A and FIG. 5B are respectively schematic diagrams of a TDD inter-cell subframe configuration coordination signaling process according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a base station device according to an embodiment of the present invention. detailed description

To implement dynamic allocation of uplink and downlink subframes, the following scheme may be adopted: In a certain period of time, four seed frame types are set, including a subframe fixed for downlink transmission, a subframe fixed for uplink transmission, and flexible allocation. A subframe transmitted for uplink or downlink. For example, as shown in FIG. 2, the time period is a radio frame (only one example, and may be other time periods), where subframes #0, #5 are fixed downlink subframes, subframe #2, # 7 is a fixed uplink subframe, subframes #1, #6 are special subframes (which can also be classified as fixed downlink subframes), and other subframes (#3, #4, #8, #9) are flexibly allocated as Subframe transmitted in the uplink or downlink. For the last type of subframe, the base station can be dynamically configured according to real-time service requirements and channel conditions to adapt to dynamic changes in service requirements.

In the above solution, only the method of dynamically configuring the TDD subframe is given. In the actual system, if different uplink and downlink subframe configurations are set for different cells, the cross-slot interference of the neighboring cells may be caused, as shown in FIG. Show. It should be noted that the neighboring cell here may be a geographically adjacent cell using the same TDD carrier (as shown in FIG. 3), a cell deployed in the same layer (for example, a macro cell), or may be layered. A deployed cell (eg, including a macro cell, a micro cell, a home base station, etc.). The impact of such cross-slots 4 on system performance is closely related to the deployment scenario and the wireless environment. For example, if the distance between adjacent cells is relatively close, or the signal propagation conditions are better, the cross-slot interference will be seriously reduced. Cell performance in the receiving state; if the distance between neighboring cells is far, or there is a valid letter No. occlusion, etc., the cross-slot interference level has little effect on the performance of the cell in the receiving state.

In the above solution, although the method of flexibly configuring the uplink and downlink subframes of the TDD cell is given, the serious impact of the cross-slot interference on the system performance cannot be effectively solved, and thus the introduced flexibility cannot guarantee or even reduce the system performance.

For the above problem, the embodiment of the present invention provides a coordination mechanism for inter-cell subframe configuration in a TDD, so that a neighboring TDD cell can select an appropriate TDD subframe allocation manner by negotiation, thereby avoiding cross-slot interference to the system. The adverse effects of performance.

In the embodiment of the present invention, it is assumed that the neighboring TDD cells in the same network are time-synchronized cells, and the neighboring cells mentioned herein may be adjacent cells of the same frequency or adjacent cells of adjacent frequencies.

In the embodiment of the present invention, when the TDD base station cell determines that the subframe configuration change needs to be performed on the base station cell, the source TDD base station cell sends a subframe configuration change request to the adjacent target TDD base station cell, and receives the target TDD base station cell reply feedback. The information determines whether the subframe configuration change is performed on the base station cell according to the received feedback information, and if the determination is yes, performs corresponding setting of the subframe configuration on the base station cell. Further, after the TDD base station cell receives the subframe configuration change request message sent by the source TDD base station cell as the target TDD base station cell, according to the subframe configuration expected by the source TDD base station cell and the current subframe configuration of the local base station cell Whether there is a subframe configuration change request of the source TDD base station cell at the time of intersection, and returning feedback information for accepting or rejecting the subframe configuration change request to the source TDD base station cell.

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

Referring to FIG. 4, it is a schematic diagram of a TDD inter-cell subframe configuration coordination process according to an embodiment of the present invention. As shown in the figure, the process may include the following steps:

Step 401: The source TDD base station cell determines whether a TDD subframe configuration change is required.

In this step, the source TDD base station cell can determine whether a TDD subframe configuration change needs to be performed according to its own needs and the wireless environment condition. Specifically, the source TDD base station The factors considered when the cell performs the TDD subframe configuration change determination include, but are not limited to, one or any of the following:

(a) The current uplink and downlink traffic proportion requirement of the source TDD base station cell. For example, if the downlink service demand increases and the uplink service demand decreases, some uplink subframes can be reconfigured as downlink subframes.

(b) Source TDD base station cell uplink interference level. For example, if the interference level of the uplink subframe is high, the transmission direction of the uplink subframe corresponding to the downlink signal with the higher interference level and the interference from the neighboring base station is determined to be the downlink subframe. Specifically, if the uplink subframe of the source TDD base station cell is caused by interference from the downlink signal of the neighboring TDD base station, and the interference level is higher than the set threshold, the uplink subframe whose interference level is higher than the set threshold is changed to Downstream subframe.

(c) Source TDD base station cell downlink interference level. For example, if the interference level of the downlink subframe is high, the transmission direction of the downlink subframe corresponding to the uplink signal transmission of the user equipment (UE) can be changed. Configured as an uplink subframe. Specifically, if the downlink subframe of the source TDD base station cell is caused by the interference of the uplink signal from the neighboring TDD base station cell UE, and the interference level is higher than the set threshold, the downlink subframe whose interference level is higher than the set threshold is performed. Change to an uplink subframe.

(d) The interference indication information of the neighboring base station cell received by the source TDD base station cell. For example, the neighboring base station cell indicates that an uplink subframe is subjected to strong interference if the source

The TDD base station cell configures the downlink transmission on the corresponding subframe, and then adapts it to the uplink subframe. Specifically, the source TDD base station cell determines, according to the received interference indication information of the neighboring base station cell, that the interference that the neighboring base station cell has in the uplink subframe exceeds a set threshold, and the subframe is configured in the source TDD base station cell. For the downlink subframe, the source TDD base station cell changes the downlink subframe to an uplink subframe.

(e) The transmit power indication information of the neighboring base station cells received by the source TDD base station cell. For example, the neighboring base station cell indicates that the downlink transmission power is increased. If the source TDD base station cell configures the uplink transmission in the corresponding subframe, it is configured as a downlink subframe.

Step 402: If the source TDD base station cell determines that the TDD subframe configuration needs to be changed Further, the TDD subframe configuration change request message is transmitted to the adjacent target TDD base station cell. Specifically, the request message may include but is not limited to one or any of the following information:

(a) the current TDD subframe configuration of the source TDD base station cell;

(b) a target TDD subframe configuration in which the source TDD base station cell desires to change;

(c) The reason why the source TDD base station cell desires to change the configuration of the TDD subframe, for example, the reason may be a service demand trigger or an interference trigger or the like.

(d) the path loss measured between the source TDD base station cell and the target TDD base station cell;

(e) the downlink TDD power of the target TDD base station received by the source TDD base station cell;

(f) Source TDD base station cell downlink signal transmission power.

Step 403: After receiving the TDD subframe configuration change request message sent by the source TDD base station cell, the target TDD base station cell checks, according to the target TDD subframe configuration desired by the source TDD base station cell, the current (in the target TDD base station cell) In the case where there is no need to perform subframe configuration change at this time) or desired (when the target TDD base station cell has a need to perform subframe configuration change at this time), the TDD subframe configures the base station cell to determine whether to accept the source TDD base station cell. TDD subframe configuration change request.

Specifically, if the target TDD base station cell receives the TDD subframe configuration change request message of the plurality of source TDD base station cells, the judgment is performed one by one for each source TDD base station cell.

Specifically, the target TDD base station cell may consider one or any of the following factors in the judgment process:

(a) Whether the subframe in which the cross slot is present is a subframe in which the target TDD base station cell transmits key information. For example, the target TDD base station cell is configured with a random access channel or other key uplink control signal transmission in a certain uplink subframe, and the source TDD base station cell desires to adapt the position corresponding to the subframe to the downlink transmission, which may be The target TDD base station cell causes a large performance degradation. In this case, the target TDD base station cell can be rejected. The TDD subframe configuration change request of the source TDD base station cell.

(b) The path loss between the source TDD base station cell and the target TDD base station cell. For example, if the path loss is less than the preset threshold, a large cross-slot interference may be caused. In this case, the target TDD base station cell may reject the TDD subframe configuration change request of the source TDD base station cell. The path loss can be obtained in one of several ways:

Mode 1: The source TDD base station cell measures the path loss, and sends the measured path loss value to the target TDD base station cell;

Mode 2: Target The TDD base station cell measures and calculates the path loss by itself. For example, the learned TDD base station cell downlink signal transmission power is subtracted from the source TDD base station cell downlink signal transmission power received by the target TDD base station cell;

Mode 3: The source TDD base station cell measures the downlink signal power (set to P_r) of the target TDD base station received, and the target TDD base station calculates the path loss (PL) indirectly. For example, the target TDD base station cell downlink signal transmission power is P_t, then PL=P_t-P_r.

(c) The source TDD base station cell downlink signal power received by the target TDD base station cell. For example, if the power received by the target TDD base station cell is greater than the preset threshold, a large cross-slot interference may be caused. In this case, the target TDD base station cell may reject the TDD subframe configuration change request of the source TDD base station cell. .

The received power level can be obtained by using one of the following methods: Mode 1: Target The TDD base station cell directly measures the downlink signal power of the received source TDD base station cell;

Manner 2: The target TDD base station cell obtains the received power by learning the source TDD base station cell transmit power and the path loss between the two.

(d) Source TDD base station cell changes the reason for TDD subframe configuration. For example, if the calculated or measured cross-slot interference level is similar, if the TDD subframe configuration change triggered by the source cell service requirement, the priority may be appropriately lower than the TDD subframe configuration triggered by the interference avoidance. The priority of the change.

Step 404: The target TDD base station cell according to whether to accept the source TDD base station cell The TDD subframe configuration change request sends a feedback message to the source TDD base station cell.

Specifically, the feedback message may include but is not limited to one or any of the following information:

(a) Receive or reject the indication of the source TDD base station cell subframe configuration change request

(b) Reason for rejecting the source TDD base station cell subframe configuration change request. For example, it indicates that the base station cell (ie, the target TDD base station cell) cannot accept cross-slot interference, or indicates that the source TDD base station cell transmission power is too high;

(c) current TDD subframe configuration information of the target TDD base station cell;

(d) a TDD subframe configuration mode of the source TDD base station cell that the target TDD base station cell can accept;

(e) The transmit power of the source TDD base station cell that the target TDD base station cell can accept.

Step 405: After receiving the feedback message returned by the target TDD base station cell, the source TDD base station cell performs corresponding processing according to the feedback message. For example, if the target TDD base station cell rejects the subframe configuration change request of the source TDD base station cell, the source TDD base station cell keeps the current subframe configuration unchanged; if the target TDD base station cell accepts the subframe configuration change request of the source TDD base station cell, then The source TDD base station cell changes the current subframe configuration.

If the source TDD base station cell receives the feedback message of the multiple target TDD base station cells, the TDD subframe configuration may be integrated, for example, if at least one target TDD base station cell replies with the reject message, the source TDD base station cell maintains the current The subframe configuration is unchanged.

The subframe configuration coordination process between the above TDD cells can be performed under different conditions. For example, it can be triggered in at least two cases:

(1) When the source TDD cell base station is initialized, the TDD subframe configuration is set for the first time;

(2) Before the source TDD cell base station is running normally, it needs to change the TDD subframe configuration before.

The signaling interaction process of the subframe configuration coordination process between the foregoing TDD cells may be as shown in FIG. 5A. Or as shown in Figure 5B. 5A shows a signaling flow of a subframe configuration change request of a target TDD base station cell accepting a source TDD base station cell, and FIG. 5B shows a signaling of a subframe configuration change request of a target TDD base station cell reject source TDD base station cell. Process. For example, interaction may be performed through a wired interface between adjacent cells, such as an X2 interface or/and an S1 interface, or may be directly performed and transmitted through an air interface between adjacent cells.

It can be seen from the above description that the TDD inter-cell subframe configuration coordination scheme provided by the embodiment of the present invention enables a neighboring cell to select an appropriate TDD subframe allocation manner by negotiation, thereby avoiding cross-slot interference to system performance. The adverse effects make the flexible TDD subframe allocation mechanism work better, that is, while ensuring the flexibility of TDD subframe configuration, the impact of cross-slot interference on system performance is also avoided to some extent, and the technical solution is improved. Availability.

Based on the same technical concept, an embodiment of the present invention further provides a base station, which can be applied to the foregoing processing flow.

FIG. 6 is a schematic structural diagram of a base station according to an embodiment of the present invention. As shown in the figure, the base station may include:

The first determining module 601 is configured to perform a subframe configuration change decision on the base station cell when the base station is the source base station, and send the subframe configuration change to the neighboring target base station when the base station cell needs to be changed. Subframe configuration change request;

The second determining module 602 is configured to determine, if the base station is the target base station, whether to accept the subframe configuration change request of the source base station;

The feedback module 603 is configured to: when the base station is the target base station, return, to the source base station, whether to accept the feedback information of the subframe configuration change request;

The configuration module 604 is configured to: if the base station is the source base station, perform corresponding setting of the subframe configuration on the cell of the base station according to whether the target base station returns the feedback information of the subframe configuration change request.

In the foregoing base station, the first determining module 601 may carry the subframe configuration expected by the base station cell in the subframe configuration change request; the second determining module 602 may be configured according to the source base station. Whether there is an inter-slot and an inter-slot interference level between the subframe configuration and the current or desired subframe configuration of the base station cell, and determining to accept or reject the subframe configuration change request of the source base station.

In the foregoing base station, the first determining module 601 may perform a subframe configuration change decision on the base station cell according to one or any combination of the following:

(a) the current upstream and downstream traffic ratio requirements of the base station cell;

(b) the uplink interference level of the cell of the base station; specifically; if the uplink subframe signal received by the base station cell is interfered by the downlink signal from the neighboring base station cell, and the interference level is higher than a set threshold, the interference level is high. The uplink subframe that sets the threshold is changed to the downlink subframe.

(C) the downlink interference level of the cell of the base station; specifically, if the user of the cell of the base station receives the interference of the uplink signal from the user equipment of the neighboring cell, and the interference level is higher than the set threshold, The downlink subframe whose interference level is higher than the set threshold is changed to the uplink subframe.

(d) the interference indication information of the neighboring base station cell received by the cell in the centralized group; specifically, if the base station cell determines, according to the received interference indication information of the neighboring base station cell, the neighboring base station cell has an uplink subframe received If the interference exceeds the set threshold, and the subframe is configured as a downlink subframe in the base station cell, the downlink subframe is changed to an uplink subframe.

(e) the transmit power indication information of the neighboring base station cell received by the base station d and the area; specifically, if the base station cell determines the downlink transmit power of the neighboring base station according to the received transmit power indication information of the neighboring base station cell If the corresponding subframe of the cell of the base station is an uplink subframe, the uplink subframe is changed to a downlink subframe.

In the foregoing base station, the first determining module 601 may carry one or any combination of the following information in the subframe configuration change request message:

The desired subframe configuration of the base station cell;

The current subframe configuration of the base station cell;

The reason why the base station cell desires to change the subframe configuration;

The path loss measured by the base station cell and the target base station cell; the downlink signal power of the target base station cell received by the base station cell; Downlink signal transmission power of the base station cell.

In the foregoing base station, the second determining module 602 may determine to accept or reject the subframe configuration change request of the source base station according to one or any combination of the following:

(a) whether the subframe in which the cross-slot is present is a subframe in which the base station cell transmits the key information; specifically, if the base station cell is configured with the uplink uplink control signal transmission in the uplink subframe in which the cross-slot is present, the source base station cell If it is desired to change the position corresponding to the subframe to the downlink transmission, the subframe configuration change request of the source base station cell is rejected.

(b) the path loss between the source base station cell and the local base station cell. Specifically, if the path loss is less than the preset threshold, the subframe configuration change request of the source TDD base station cell is rejected.

(c) the downlink signal power of the source base station cell received by the base station cell; specifically, if the power received by the base station cell is greater than a preset threshold, the subframe configuration change request of the source TDD base station cell is rejected.

(d) The reason why the source base station cell changes the subframe configuration.

In the foregoing base station, the feedback module 603 may carry one or any combination of the following information to the feedback message and return it to the source base station:

Receiving or rejecting indication information of a source base station cell subframe configuration change request;

Reason for rejecting the source base station cell subframe configuration change request;

The current subframe configuration of the base station cell;

a subframe configuration mode of the source base station cell that the base station cell can accept;

The transmit power of the source base station cell that the base station cell can accept.

In the foregoing base station, the configuration module 604 is specifically configured to: if the base station receives the feedback message of the multiple target base station cells, synthesize the feedback information of the multiple target base station cells, and perform the setting of the base station cell subframe configuration.

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 this understanding, the form of the software product is embodied, the computer software product is stored in a storage medium A number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods described in various embodiments of the present invention.

A person skilled in the art can understand that the drawings are only a schematic diagram of a preferred embodiment, and the modules or processes in the drawings are not necessarily required to implement the invention.

Those skilled in the art can understand that the modules in the apparatus in the embodiments may be distributed in the apparatus of the embodiment according to the description of the embodiments, or may be correspondingly changed in one or more apparatuses different from the embodiment. The modules of the above embodiments may be combined into one module, or may be further split into a plurality of sub-modules.

The serial numbers of the embodiments of the present invention are merely for the description, and do not represent the advantages and disadvantages of the embodiments. The above disclosure is only a few specific embodiments of the present invention, but the present invention is not limited thereto, and any changes that can be made by those skilled in the art should fall within the protection scope of the present invention.

Claims

Rights request

A time division duplex TDD inter-cell subframe configuration coordination method, which is characterized in that:

The source TDD base station cell performs a subframe configuration change decision on the base station cell, and sends a subframe configuration change request to the adjacent target TDD base station cell when it is determined that the subframe configuration change needs to be performed on the base station cell;

The method according to claim 1, wherein the subframe configuration change request carries a subframe configuration desired by an active TDD base station cell;

Determining whether to accept or reject the target TDD base station cell according to whether there is an inter-slot and an inter-slot interference level between the subframe configuration expected by the source TDD base station cell and the current or desired subframe configuration of the base station cell. A subframe configuration change request of the source TDD base station cell.

The method according to claim 1, wherein the source TDD base station cell performs a subframe configuration change decision on the base station cell according to one or any combination of the following: the current uplink and downlink service proportion requirement of the source TDD base station cell;

The uplink interference level of the source TDD base station cell;

Downlink interference level of the source TDD base station cell;

The interference indication information of the neighboring base station cell received by the source TDD base station cell; the transmission power indication information of the neighboring base station cell received by the source TDD base station cell.

4. The method of claim 3, wherein

The source TDD base station cell performs a subframe configuration change decision on the base station cell according to the uplink interference level, and includes:

If the source TDD base station cell receives the uplink subframe signal from the downlink signal of the neighboring TDD base station, and the interference level is higher than the set threshold, the uplink subframe with the interference level higher than the set threshold is changed to the downlink subframe. frame; Or, the source TDD base station cell performs a subframe configuration change decision on the base station cell according to the downlink interference level, and includes:

If the user of the source TDD base station receives the interference of the uplink signal from the neighboring TDD base station cell user equipment, and the interference level is higher than the set threshold, the interference level is higher than the set threshold. The frame is changed to an uplink subframe;

Or, the source TDD base station cell performs a subframe configuration change decision according to the received interference indication information of the neighboring base station cell, and includes:

The source TDD base station cell determines, according to the received interference indication information of the neighboring base station cell, that the interference that the neighboring base station cell has in the uplink subframe exceeds a set threshold, and the subframe is configured as a downlink in the source TDD base station cell. a frame, the source TDD base station cell changes the downlink subframe to an uplink subframe;

Or, the source TDD base station cell performs a subframe configuration change decision according to the received transmit power indication information of the neighboring base station cell, and includes:

The source TDD base station cell determines, according to the received transmit power indication information of the neighboring base station cell, that the downlink transmit power of the neighboring base station is increased, and the corresponding subframe of the source TDD base station cell is an uplink subframe, and the source TDD base station cell The uplink subframe is changed to a downlink subframe.

The method according to claim 1, wherein the subframe configuration change request message carries one or any combination of the following information:

The desired subframe configuration of the source TDD base station cell;

Source TDD base station cell current subframe configuration;

The reason why the source TDD base station cell expects to change the subframe configuration;

The path loss measured between the source TDD base station cell and the target TDD base station cell;

Source TDD base station cell received downlink TDD base station cell downlink signal power; source TDD base station cell downlink signal transmission power.

The method according to claim 1, wherein the target TDD base station cell determines to accept or reject a subframe configuration change request of the source TDD base station according to one or any combination of the following:

Whether a subframe in which a cross slot is present is a subframe in which a base station cell transmits key information; The path loss between the source TDD base station cell and the base station cell;

Target TDD base station cell received source TDD base station cell downlink signal power; source TDD base station cell changed subframe configuration reason.

7. The method of claim 6 wherein:

The target TDD base station cell determines whether to accept or reject the subframe configuration change request of the source TDD base station cell according to whether the subframe in which the cross-slot is present is the subframe in which the base station cell transmits the key information, including:

If the target TDD base station cell is configured with the key uplink control signal transmission in the uplink subframe in which the cross-slot is present, and the source TDD base station cell desires to change the position corresponding to the subframe to the downlink transmission, the target TDD base station cell rejects the source TDD base station cell. Subframe configuration change request;

Or, the target TDD base station, the area determines, according to the path loss between the source TDD base station cell and the base station cell, a frame configuration change request for accepting or rejecting the source TDD base station cell, including:

If the path loss is less than a preset threshold, the target TDD base station cell rejects the source

a subframe configuration change request of the TDD base station cell;

Or, the target TDD base station cell determines, according to the received source TDD base station cell downlink signal power, the accepting or rejecting the subframe configuration change request of the source TDD base station cell, including: if the target TDD base station cell receives the power greater than a preset threshold Then, the target TDD base station cell rejects the subframe configuration change request of the source TDD base station cell.

8. The method according to claim 1, wherein the feedback information comprises one or any combination of the following information:

Receiving or rejecting the indication information of the source TDD base station cell subframe configuration change request; rejecting the source TDD base station cell subframe configuration change request;

Target TDD base station cell current subframe configuration;

The subframe configuration mode of the source TDD base station cell that the target TDD base station cell can accept;

Target The transmit power of the source TDD base station cell that the TDD base station cell can accept.

9. The method of claim 1 wherein: said source TDD base station is small The determining, according to the received feedback information, whether the subframe configuration change is performed on the cell of the base station, includes:

If the source TDD base station cell receives the feedback message of the multiple target TDD base station cells, the feedback information of the multiple target TDD base station cells is integrated, and the TDD subframe configuration is set.

A base station, which is applied to a time division duplex TDD system, and includes: a first determining module, configured to perform a subframe configuration change decision on a cell of the base station when the base station is a source base station, and determine When the subframe configuration change needs to be performed on the base station cell, the subframe configuration change request is sent to the adjacent target base station;

The base station according to claim 10, wherein the first decision module is configured to: carry the subframe configuration desired by the base station cell in the subframe configuration change request;

The second determining module is specifically configured to determine whether to accept or reject the source base station according to whether a subframe configuration desired by the source base station and a current or desired subframe configuration of the base station cell have cross-slots and cross-slot interference levels. Subframe configuration change request.

The base station according to claim 10, wherein the first decision module is specifically configured to perform a subframe configuration change decision on the base station cell according to one or any combination of the following:

The current uplink and downlink service proportion requirement of the base station cell;

The uplink interference level of the base station cell;

The downlink interference level of the base station cell;

Interference indication information of neighboring base station cells received by the centralized cell; The transmit power indication information of the neighboring base station cell received by the base station cell.

13. The base station of claim 12, wherein:

The first determining module is specifically configured to: if the uplink subframe signal received by the base station cell is interfered by a downlink signal from a neighboring base station cell, and the interference level is higher than a set threshold, the interference level is higher than a set threshold. The uplink subframe is changed to a downlink subframe;

Or the first determining module is specifically configured to: if the user of the base station cell receives the interference of the uplink signal from the neighboring cell user equipment, and the interference level is higher than a set threshold, The downlink subframe whose interference level is higher than the set threshold is changed to the uplink subframe;

Or the first determining module is specifically configured to: if the base station cell determines, according to the received interference indication information of the neighboring base station cell, that the interference of the uplink subframe in the neighboring base station exceeds a set threshold, and the sub If the frame is configured as a downlink subframe, the downlink subframe is changed to an uplink subframe.

Or the first determining module is specifically configured to: if the base station cell determines, according to the received transmit power indication information of the neighboring base station cell, the downlink transmit power of the neighboring base station is increased, and the corresponding subframe of the base station cell is In the uplink subframe, the uplink subframe is changed to a downlink subframe.

The base station according to claim 10, wherein the first decision module is specifically configured to carry one or any combination of the following information in the subframe configuration change request message:

The desired subframe configuration of the base station cell;

The current subframe configuration of the base station cell;

The path loss measured by the base station cell and the target base station cell; the downlink signal power of the target base station cell received by the base station cell;

Downlink signal transmission power of the base station cell.

The base station according to claim 10, wherein the second determining module is specifically configured to: determine, according to one or any combination of the following, to determine or reject a subframe configuration change request of the source base station: Whether the subframe in which the cross slot is present is the subframe in which the base station cell transmits the key information; the path loss between the source base station cell and the base station cell;

The downlink signal power of the source base station cell received by the base station cell;

The reason why the source base station cell changes the subframe configuration.

16. The base station of claim 15 wherein:

The second determining module is specifically configured to: if the base station cell configures a key uplink control signal transmission in an uplink subframe in which the cross-slot is present, and the source base station cell desires to change the position corresponding to the subframe to the downlink transmission, rejecting a subframe configuration change request of the source base station cell; or, the second determining module is specifically configured to: if the path loss is less than a preset threshold, reject a subframe configuration change request of the source TDD base station cell;

Or the second determining module is specifically configured to: if the power received by the base station cell is greater than a preset threshold, reject the subframe configuration change request of the source TDD base station cell.

The base station according to claim 10, wherein the feedback module is configured to: carry one or any combination of the following information to the feedback message and return it to the source base station:

The current subframe configuration of the base station cell;

The base station according to claim 10, wherein the configuration module is configured to: if the base station receives feedback messages of multiple target base station cells, synthesize feedback information of the multiple target base station cells, The setting of the cell subframe configuration of the base station is performed.