WO2011009271A1 - Method for collaborative multiple point transmission and reception and corresponding base station - Google Patents

Abstract

A method for collaborative multiple point transmission and reception and a base station are provided. The method includes: a pattern set for collaborative multiple point transmission and reception is preset in the base station (BS); a collaborative BS group is configured for each pattern in the pattern set, and a selection condition is set for each pattern; for an accessed user terminal (UT) which is going to perform collaborative multiple point transmission and reception, the serving BS acquires performance parameter values of the UT, and selects one of the patterns corresponding to the selection condition satisfied by the values; collaborative multiple point transmission and reception of the UT is performed via the collaborative BS group configured for the selected pattern. With the invention, performance requirements in different wireless communication environments, such as throughout and peak data rate and so on, can be met and the system overhead can be effectively reduced.

Description

 Multi-point cooperative transmission and reception method and corresponding base station

 The present invention relates to a wireless communication network, and more particularly to a method and a base station for coordinated multi-point transmission and reception. Background technique

 In the next-generation broadband wireless communication network, the problem of inter-cell user terminal UT (UT, User Terminal) throughput, average UT throughput, especially the throughput and peak rate of the cell edge UT is a key factor and Serious challenges. At present, in IEEE 802.16j, IMT-Advanced, and WINNER, a method of transmitting and receiving by CoMP (Collaborative Multiple Point) is proposed to solve the problem.

 The basic concept of CoMP transmission and reception is: Joint transmission and reception between multiple coordinated BSs (BS, Base Stations) and a single UT on the same radio resource. There are two basic characteristics:

 (1) Each UT can be jointly served by multiple BSs through BS cooperation on the same radio resource, which can make inter-cell interference can be alleviated, or change inter-cell interference into useful signal function.

(2) Each BS can serve multiple UTs on the same radio resource, and all sector throughput can be improved.

However, in the implementation of CoMP transmission and reception, using the same resource for one UT in multiple cooperative BSs may cause waste of resources; in the uplink where inter-cell interference exists, when selecting at the same time at the cell edge When the UT performs CoMP transmission and reception, it may cause severe inter-cell interference, which in turn significantly reduces cell edge throughput, peak rate, and average cell throughput. Summary of the invention

 In view of the above, an object of the present invention is to provide a method and a base station for coordinated multi-point transmission and reception, which can be selected to a suitable cooperative base station in combination with the performance requirements of the UT.

 In order to achieve the above object, the solution of the present invention is achieved as follows:

 The present invention provides a method for multipoint coordinated transmission and reception, the method comprising: setting a style set for multipoint coordinated transmission and reception at a base station (BS); configuring a cooperative BS for each style in the style set Group, and set selection criteria for each of the styles;

 For the user terminal (UT) to be connected and transmitted in a coordinated manner, the serving BS obtains the value of the UT performance parameter, and selects a style from the style corresponding to the selection condition that the value can satisfy. ;

 Multipoint coordinated transmission and reception of the UT is performed by a cooperative BS group configured for the selected style.

 Wherein, setting a selection condition for each style correspondingly includes:

 Dividing the styles in the style set into one or more subsets, and setting a set of UT performance parameters and their value requirements for each subset as a trigger condition for selecting the subset;

 Setting a selection strategy for the cooperative BS group participating in the multi-point cooperative transmission and reception in the subset mainly includes a set of UT performance parameters and a value requirement thereof to be considered when selecting the cooperative BS group;

 The trigger condition of the subset and the selection strategy of the BS group are used as selection conditions of the pattern; accordingly, the selection of the pair style is completed by:

 The UT that is to be configured to perform multi-point coordinated transmission and reception, the serving BS first determines, according to the obtained value of the UT performance parameter, a trigger condition that the value can satisfy, and selects the trigger condition. Corresponding subset;

The serving BS selects a cooperative BS group from the cooperative BS group configured for the selected subset style according to the selection policy of the cooperative BS group and the value of the acquired UT performance parameter, by using the collaboration The BS group performs multipoint coordinated transmission and reception of the UT. The pattern and its selection conditions are established by negotiation between BSs;

 The UT performance parameters include parameters of the UT capability and/or parameters measured during UT communication. The pattern set includes a plurality of subsets, and the number of BSs included in the cooperative BS group configured for the styles in each subset is different.

 When a set of UT performance parameters and their value requirements are set for each subset, it is ensured that the cooperative BS group configured for the subset style has the ability to meet the value requirements of the group UT performance parameters.

 The method further includes: selecting inter-cell interference as a performance parameter to select a cooperative BS group, specifically:

 In a cooperative BS group configured for the selected subset style, selecting a cooperative BS group including the serving BS and one or more BSs that have the strongest interference to the UT, performing coordinated multi-point transmission and reception of the UT; Or,

 In a cooperative BS group configured for the selected subset style, selecting a coordinated BS group including the serving BS and the BS having interference to the UT greater than the set inter-cell interference threshold, performing coordinated multi-point transmission of the UT And receiving.

 The present invention also provides a base station having multi-point cooperative transmission and reception functions, including a multipoint cooperation module, a setting module and a selection module, wherein:

 The setting module is configured to preset a style set for multi-point cooperative transmission and reception, configure a cooperative BS group for each style in the style set, and set a selection condition for each style;

 The selection module is configured to compare the value of the acquired UT performance parameter with the selection condition for the UT to be connected and received by the multipoint, and the selection condition corresponding to the value that can be satisfied Select a style in the style, and notify the multi-point collaboration module;

The multipoint cooperation module is configured to perform multipoint coordinated transmission and reception of the UT by a cooperative BS group configured for the selected style. The setting module includes a style setting sub-module and a condition setting sub-module, and the selecting module includes a first selecting sub-module and a second selecting sub-module, wherein:

 The style setting sub-module is configured to preset a style set for multi-point cooperative sending and receiving, configure a cooperative BS group for each style in the style set, and divide the style in the style set into one or Multiple subsets;

 The condition setting sub-module is connected to the style setting sub-module, and is configured to set a set of UT performance parameters and their value requirements for each subset as a trigger condition for selecting the subset; and set a pair of subsets at the same time The selection strategy of the cooperative BS group participating in the multi-point cooperative transmission and reception mainly includes a set of UT performance parameters and their value requirements to be considered when selecting the cooperative BS group;

 The first selection sub-module is connected to the style setting sub-module and the condition setting sub-module, and is configured to determine, by using a value of the acquired UT performance parameter, a UT that needs to perform multi-point cooperative transmission and reception. Determining a trigger condition that the value can satisfy, selecting a subset corresponding to the trigger condition, and notifying the second selection submodule;

 The second selection sub-module is connected to the style setting sub-module, the condition setting sub-module, and the first selection sub-module, and is configured to select according to a selection policy of the cooperative BS group and a value of the acquired UT performance parameter. A cooperative BS group is selected from the cooperative BS group configured by the stator concentration pattern.

 The condition setting submodule is further configured to set inter-cell interference as a performance parameter to be considered when selecting a cooperative BS group;

 The second selection submodule is further configured to select, in the cooperative BS group configured for the selected subset style, a cooperative BS group including the serving BS and one or more BSs that have the strongest interference to the UT. Multi-point cooperative transmission and reception of the UT; or

 The second selection submodule is further configured to: in the cooperative BS group configured for the selected subset style, select a cooperative BS that includes the serving BS and the BS that has interference with the UT greater than a set inter-cell interference threshold. The group performs multi-point cooperative transmission and reception of the UT.

The condition setting sub-module is set in a trigger condition of the subset and a selection policy of the BS group The set UT performance parameters include: UT capability parameters and/or parameters measured during UT communication; the condition setting sub-module is further used to set a set of UT performance parameters and their value requirements for each subset correspondingly And ensuring that the cooperative BS group configured for the subset style has the ability to satisfy the value requirement of the group UT performance parameter.

 The above embodiment solution can meet performance requirements such as throughput and peak data rate in different wireless communication environments by setting a multi-point coordinated transmission/reception (CoMP) style set and a style selection condition. Further, by properly setting the CoMP style set and the trigger threshold, the performance of the UT bandwidth capability, the throughput, and the peak rate are satisfied, and the number of BSs in different CoMP patterns is limited, the number of times of CoMP transmission and reception is reduced, and CoMP transmission and reception are performed. The number of BSs can effectively reduce system overhead. In an embodiment, considering the Inter-cell Interference Coordination (ICIC), only the BS with severe interference to the UT is selected as the cooperative BS, which may effectively reduce inter-cell interference. DRAWINGS

 1 is a flow chart of a method according to an embodiment of the present invention;

 FIG. 2 is a schematic structural diagram of a BS according to an embodiment of the present invention. detailed description

 The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

 In this embodiment, based on the multi-point cooperative transmission and reception method of the BS grouping, it is first necessary to set a style set and conditions related to the style selection, and then select corresponding styles according to these conditions for multi-point cooperative transmission and reception, as shown in FIG. Includes:

 Step 100: Pre-set a style set for CoMP transmission and reception in the BS, and configure a cooperative BS group for each style in the style set.

It can also be said that each style represents a cooperative BS group. Step 110: Divide the style in the style set into one or more subsets, and set a set of UT performance parameters and their value requirements for each subset.

 The set of UT performance parameters and their value requirements for each subset is the trigger condition for selecting the subset. That is, if the value of the current UT performance parameter meets the value requirement of a set of UT performance parameters corresponding to a certain subset, the cooperative BS group configured in a certain style in the subset can be used to perform the current UT CoMP. Send and receive.

 The performance parameters of the UT may include: parameters of the UT capability and/or parameters measured during UT communication. The parameters of the UT capability may be bandwidth capability, throughput, peak rate, etc.; the parameters measured during UT communication may be SINR, Signal to Interference + Noise Ratio, path loss and inter-cell interference, etc. Wait. When these performance parameters take different values, it will affect the choice of BS participating in CoMP. It should be noted that the set of UT performance parameters of each style configuration may be one or more, and the types are not limited to the above mentioned ones.

 For different performance parameters, the value requirements are different, can be defined as a value or a few discrete values, or a continuous range of values, and so on. The range of values can be determined by setting one or more thresholds.

 In one application example, the set style set includes three subsets, each of which represents that 2, 3, and 4 BSs will participate in the CoMP transmission and reception of the current UT. But this is only an example, and the number of BSs in the same subset is not necessarily the same.

The more the number of BSs participating in CoMP transmission and reception, the better the general communication performance. In addition to the number, in the corresponding setting of the UT performance parameters of the subset and their value requirements, it is also necessary to consider the configuration of the cooperative BS of the style included in the subset. Capabilities, such as bandwidth capabilities, enable the cooperative BS group configured in the subset to have the ability to meet the value requirements of a set of UT performance parameters corresponding to the subset. However, as the number of BSs participating in CoMP increases, the complexity of scheduling increases, and system overhead is increased. Therefore, when setting the UT performance parameters and their value requirements corresponding to the subset, it is also necessary to consider the system overhead. The selection of the CoMP transmission and reception style is a compromise between performance and overhead. Through the spirit By setting the UT performance parameters and their value requirements, the number of participating BSs can be effectively reduced and the system overhead can be reduced under the premise of ensuring UT communication performance. By setting the parameters measured during UT communication and their value requirements, it is possible to better reflect the situation in the wireless communication network and further improve the communication performance of the current UT.

 The settings of the subsets and styles in the above style set, the UT performance parameters corresponding to the subset, and the setting requirements of the values can be completed through negotiation between the BSs.

 Step 120: Set a selection policy for the cooperative BS group that participates in CoMP transmission and reception in the subset.

 According to the selection strategy of the cooperative BS group, it can be determined which style of the subset is adopted, and the selection strategy mainly includes a set of UT performance parameters and their value requirements. Thus, the selection criteria for a style include: the trigger condition of the subset in which it is located and the selection strategy of the cooperative BS group. If the value of the current UT performance parameter meets the selection criteria of a certain style, the cooperative BS group configured for the style can be selected to perform CoMP transmission and reception of the current UT.

 In one example, the BS-to-UT interference (inter-cell interference) is taken as a performance parameter (which may be one or more) to be considered for selecting the BS, and one or more BSs and service BSs that have the strongest interference to the UT are selected— CoMP transmission and reception are performed. For a cooperative BS group, it is equivalent to requiring the non-serving BS to have the strongest interference to the UT. In another example, the inter-cell interference is also considered as a performance parameter considered by the selected BS, and the BS and the serving BS whose UT interference is greater than the set inter-cell interference threshold are selected for CoMP transmission and reception, for a cooperative BS. For the group, it is equivalent to requiring the non-serving BS to interfere with the UT greater than the set inter-cell interference threshold. Considering inter-cell interference coordination, selecting a BS with severe interference to the UT to participate in CoMP transmission and reception can effectively reduce the interference of other BSs on the UT. In addition to inter-cell interference, other one or more performance parameters may be combined to select a cooperative BS group, such as SINR, path loss, and the like.

It can be understood that in another embodiment, the division of the subset may not be performed, directly for each Configuration selection criteria, including a set of UT performance parameters and their value requirements. After dividing into the subset, the set of UT performance parameters and their value requirements are set for each subset, and another set of UT performance parameters and their value requirements are set in the selection strategy of the cooperative BS group. A set of UT performance parameters and their value requirements are set for each style. Further, the selection condition of a certain style is actually a selection condition of a cooperative BS group.

 Step 130: For the UT to be sent and received by the CoMP, the serving BS first determines a trigger condition that can be satisfied according to the obtained value of the UT performance parameter, and selects a subset corresponding to the trigger condition.

 If the value of a UT's actual performance parameter satisfies multiple trigger conditions, a subset with a lower system overhead can be selected from the subset corresponding to these trigger conditions.

 Step 140: The serving BS selects a cooperative BS group from the cooperative BS group configured in the selected subset style according to the selection policy of the cooperative BS group and the value of the obtained UT performance parameter, and performs the UT through the cooperative BS group. CoMP sends and receives.

 In one example, the cooperative BS group configured in the selected subset style includes two BSs, and the service BS and the pair UT may be selected from the cooperative BS groups configured for each style included in the subset. A cooperative BS group of one of the most interfered BSs performs CoMP transmission and reception of the UT. The cooperative BS group configured in the selected subset style includes three BSs, and the two BSs including the serving BS and the strongest interference to the UT can be selected from the cooperative BS groups configured for the respective styles included in the subset. A cooperative BS group performs CoMP transmission and reception of the UT.

 In another example, the value of the selection policy in the cooperative BS group is that the interference of the BS to the UT is greater than the set inter-cell interference threshold, and the cooperative BS group configured for the selected subset style may be configured according to the selection policy. One or more collaborative BS groups that meet the criteria are selected. When multiple cooperative BS groups are selected, one may be selected from one of them, or one may be selected according to a pre-agreed priority order, or may be selected in combination with other performance parameters of the UT such as SINR.

Correspondingly, the structure of the BS used in the foregoing method for implementing the foregoing method is as shown in FIG. 2, including multiple Point collaboration module, setup module and selection module, where:

 a setting module, configured to preset a style set for multi-point cooperative sending and receiving, configure a cooperative BS group for each style in the style set, and set a selection condition for each style; Access to the UT to be multi-point cooperative transmission and reception, which will be obtained

The value of the UT performance parameter is compared with the selection condition, and a style is selected from the corresponding mode of the selection condition that the value can satisfy, and the multi-point cooperation module is notified;

 A multi-point collaboration module is configured to perform multi-point coordinated transmission and reception of the UT by the cooperative BS group configured for the selected style.

 The setting module includes a style setting sub-module and a condition setting sub-module, and the selection module includes a first selection sub-module and a second selection sub-module, wherein:

 a style setting sub-module, configured to preset a style set for multi-point cooperative sending and receiving, configure a cooperative BS group for each style in the style set, and divide the style in the style set into one or more sub-categories Set

 The condition setting sub-module is connected to the style setting sub-module, and is configured to set a set of UT performance parameters and their value requirements for each subset as a trigger condition for selecting the subset; and simultaneously set to participate in multi-point cooperative transmission in the subset. And the selection strategy of the received cooperative BS group, mainly including selection and cooperation

A set of UT performance parameters and their value requirements to be considered in the BS group;

 The first selection sub-module is connected to the modality setting sub-module and the condition setting sub-module, and is used for the UT that needs to perform multi-point cooperative transmission and reception, and determines the trigger that the value can satisfy according to the value of the obtained UT performance parameter. Condition, selecting a subset corresponding to the trigger condition and notifying the second selection submodule;

 The second selection submodule is connected to the style setting submodule, the condition setting submodule, and the first selection submodule, and is configured to configure the style according to the selection strategy of the cooperative BS group and the obtained UT performance parameter. A cooperative BS group is selected from the cooperative BS group.

Condition setting sub-module, further used to set inter-cell interference to select a cooperative BS group a performance parameter considered;

 a second selection sub-module, further configured to select, in the cooperative BS group configured for the selected subset style, a cooperative BS group including the serving BS and one or more BSs that have the strongest interference to the UT to perform the UT Point collaboration to send and receive; or,

 a second selection submodule, further configured to select, in the cooperative BS group configured for the selected subset style, a cooperative BS group including the serving BS and the BS that has interference to the UT greater than the set inter-cell interference threshold. UT multi-point collaboration to send and receive.

 The UT performance parameters set by the condition setting sub-module in the trigger condition of the subset and the selection policy of the BS group include: parameters of the UT capability and/or parameters measured during UT communication;

 The condition setting sub-module is further configured to: when a set of UT performance parameters and their value requirements are set for a subset, ensure that the cooperative BS group configured for the subset style has a value requirement that satisfies the set of UT performance parameters. ability.

 Specific implementations of these functional modules can be found in the detailed description of the method flow above. With the above solution, compared with the prior art, a multi-point coordinated transmission/reception (CoMP) style set can be set through negotiation between BSs, and the styles in each style set are configured with different cooperative BS groups to meet different Performance requirements such as throughput and peak data rate in a wireless communication environment. At the same time, different UT performance parameters and their value requirements are set for different subsets of the CoMP style set, and the values of the UT performance parameters are used to trigger different uses. a subset of. Considering inter-cell interference coordination (ICIC), BSs with severe interference to the UT can be selected to participate in CoMP transmission and reception. At the same time, in order to effectively reduce the system overhead, under the premise of satisfying the UT performance, the participation can be reduced by appropriately setting the performance parameters corresponding to the subset and the range of values, and limiting the number of BSs of the cooperative BS group configured in the subset. The number of BSs that the CoMP sends and receives.

 The present invention has been disclosed in the foregoing preferred embodiments, and is not intended to limit the scope of the present invention, and modifications may be included in the scope of the present application without departing from the spirit and scope of the invention. Inside.

Claims

Claim  A method for multi-point coordinated transmission and reception, the method comprising: setting a style set for multi-point cooperative transmission and reception at a base station (BS); configuring each style in the style set Coordinating BS groups, and setting selection conditions for each of the styles;  For the user terminal (UT) to be connected and transmitted in a coordinated manner, the serving BS obtains the value of the UT performance parameter, and selects a style from the style corresponding to the selection condition that the value can satisfy. ;  Multipoint coordinated transmission and reception of the UT is performed by a cooperative BS group configured for the selected style.  2. The method according to claim 1, wherein setting a selection condition for each style correspondingly comprises:  Dividing the styles in the style set into one or more subsets, and setting a set of UT performance parameters and their value requirements for each subset as a trigger condition for selecting the subset;  Setting a selection strategy for the cooperative BS group participating in the multi-point cooperative transmission and reception in the subset mainly includes a set of UT performance parameters and a value requirement thereof to be considered when selecting the cooperative BS group;  The trigger condition of the subset and the selection strategy of the BS group are used as selection conditions of the pattern; accordingly, the selection of the pair style is completed by:  The UT that is to be configured to perform multi-point coordinated transmission and reception, the serving BS first determines, according to the obtained value of the UT performance parameter, a trigger condition that the value can satisfy, and selects the trigger condition. Corresponding subset;  The serving BS selects a cooperative BS group from the cooperative BS group configured for the selected subset style according to the selection policy of the cooperative BS group and the value of the acquired UT performance parameter, by using the collaboration The BS group performs multipoint coordinated transmission and reception of the UT.  3. The method of claim 1 or 2, characterized by: The pattern and its selection conditions are established by negotiation between BSs; The UT performance parameters include parameters of the UT capability and/or parameters measured during UT communication. 4. The method of claim 2, wherein:  The pattern set includes a plurality of subsets, and the number of BSs included in the cooperative BS group configured for the styles in each subset is different.  5. The method of claim 2, wherein:  When a set of UT performance parameters and their value requirements are set for each subset, it is ensured that the cooperative BS group configured for the subset style has the ability to meet the value requirements of the group UT performance parameters.  The method according to claim 2, wherein the method further comprises: selecting the small interval interference as a performance parameter to select the cooperative BS group, specifically:  In a cooperative BS group configured for the selected subset style, selecting a cooperative BS group including the serving BS and one or more BSs that have the strongest interference to the UT, performing coordinated multi-point transmission and reception of the UT; Or,  In a cooperative BS group configured for the selected subset style, selecting a coordinated BS group including the serving BS and the BS having interference to the UT greater than the set inter-cell interference threshold, performing coordinated multi-point transmission of the UT And receiving.  A base station having a multipoint coordinated transmission and reception function, comprising: a multipoint cooperation module, a setting module, and a selection module, wherein:  The setting module is configured to preset a style set for multi-point cooperative transmission and reception, configure a cooperative BS group for each style in the style set, and set a selection condition for each style;  The selection module is configured to compare the value of the acquired UT performance parameter with the selection condition for the UT to be connected and received by the multipoint, and the selection condition corresponding to the value that can be satisfied Select a style in the style, and notify the multi-point collaboration module; The multi-point collaboration module is configured to perform a collaborative BS group configured for the selected style Multi-point cooperative transmission and reception of the UT.  The base station according to claim 7, wherein the setting module comprises a style setting sub-module and a condition setting sub-module, and the selecting module comprises a first selecting sub-module and a second selecting sub-module, wherein:  The style setting sub-module is configured to preset a style set for multi-point cooperative sending and receiving, configure a cooperative BS group for each style in the style set, and divide the style in the style set into one or Multiple subsets;  The condition setting sub-module is connected to the style setting sub-module, and is configured to set a set of UT performance parameters and their value requirements for each subset as a trigger condition for selecting the subset; and set a pair of subsets at the same time The selection strategy of the cooperative BS group participating in the multi-point cooperative transmission and reception mainly includes a set of UT performance parameters and their value requirements to be considered when selecting the cooperative BS group;  The first selection sub-module is connected to the style setting sub-module and the condition setting sub-module, and is configured to determine, by using a value of the acquired UT performance parameter, a UT that needs to perform multi-point cooperative transmission and reception. Determining a trigger condition that the value can satisfy, selecting a subset corresponding to the trigger condition, and notifying the second selection submodule;  The second selection sub-module is connected to the style setting sub-module, the condition setting sub-module, and the first selection sub-module, and is configured to select according to a selection policy of the cooperative BS group and a value of the acquired UT performance parameter. A cooperative BS group is selected from the cooperative BS group configured by the stator concentration pattern.  9. The base station according to claim 7 or 8, characterized in that:  The condition setting submodule is further configured to set inter-cell interference as a performance parameter to be considered when selecting a cooperative BS group;  The second selection submodule is further configured to select, in the cooperative BS group configured for the selected subset style, a cooperative BS group including the serving BS and one or more BSs that have the strongest interference to the UT. Multi-point cooperative transmission and reception of the UT; or The second selection submodule is further used for the cooperative BS configured in the selected subset style In the group, a coordinated BS group including the serving BS and the BS that interferes with the UT greater than the set inter-cell interference threshold is selected to perform coordinated multi-point transmission and reception of the UT.  10. The base station of claim 8 wherein:  The UT performance parameter set by the condition setting submodule in the trigger condition of the subset and the selection policy of the BS group includes: a parameter of the UT capability and/or a parameter measured during UT communication; the condition setting submodule, Further, when a set of UT performance parameters and their value requirements are set for each subset, the cooperative BS group configured for the subset style has the capability of satisfying the value requirement of the group UT performance parameter.