WO2015033207A2

WO2015033207A2 - Resource allocation method and device for wireless communication system

Info

Publication number: WO2015033207A2
Application number: PCT/IB2014/001712
Authority: WO
Inventors: 熊芝兰; 张闽
Original assignee: 阿尔卡特朗讯
Priority date: 2013-08-06
Filing date: 2014-08-06
Publication date: 2015-03-12
Also published as: WO2015033207A3; CN104349481B; CN104349481A

Abstract

Embodiments of the present invention provide a resource allocation method and device for a wireless communication system. The method comprises: obtaining from multiple eNBs information relevant to the user equipment served by each eNB; analyzing the obtained information; allocating wireless resources for an eNB on the basis of the analysis; transmitting the wireless resource allocation information of the eNB to the corresponding eNB. The technical solutions of the embodiments of the present invention enable distributed scheduling.

Description

Resource allocation method and device in wireless communication system

Embodiments of the present invention relate to the field of wireless communication technologies, and more particularly to a resource allocation method and apparatus in a wireless communication system, and a scheduling method and apparatus in the wireless communication system. Background technique

In order to achieve inter-cell interference coordination and avoidance, Coordinated multi-point operation (CoMP) operation under ideal backhaul has been introduced in LTE-A Release 11 (Rel-11) to allow multiple transmission points. Work together to improve transmission performance. Currently, 3GPP is considering implementing further CoMP enhancements in Small Cell Enhancement (SCE) version 12 (Rel-12), especially in non-ideal backhaul situations. In the case of non-ideal backhaul, the non-ideal backhaul between the macro eNode B (eNB) and the small cell node (SCN) or between the two SCNs may be 5ms-60ms.

However, CoMP Rel-11 is based on the assumption of an ideal backhaul. Therefore, in CoMP Rel-11, for optimal performance, resource allocation and information exchange such as CSI, HARQ, buffer status, scheduling, precoding, MCS, etc. are all expected to be performed under the conditions of centralized scheduling and ideal backhaul. Therefore, if the CoMP scheme in the ideal backhaul scenario is directly used for the non-ideal backhaul scenario considered in SCE Rel-12, the network performance will inevitably be reduced more or less due to delayed information exchange and resource allocation.

Therefore, it is desirable to propose a CoMP scheme in the case of non-ideal backhaul in SCE Rel-12. Summary of the invention

In order to effectively alleviate or solve at least some of the above technical problems, in the first aspect, Embodiments of the present invention provide a resource allocation method in a wireless communication system. The method can include: acquiring information associated with a mobile terminal served by each base station from a plurality of base stations; analyzing the acquired information; assigning radio resources to each of the base stations based on the analyzing; The radio resource allocation information of the base station is sent to the corresponding base station.

In an exemplary embodiment, analyzing the acquired information includes identifying respective neighboring base stations of the mobile terminal.

In an exemplary embodiment, the method may further include: transmitting radio resource allocation information about a transmission base station of the mobile terminal to a neighboring base station of each of the mobile terminals.

In an exemplary embodiment, the radio resource allocation information may include at least one of the following: an identifier of the mobile terminal, indication information of the radio subframe, and indication information of the physical resource block.

In an exemplary embodiment, analyzing the acquired information may include identifying the same set of mobile terminals served by different base stations; and wherein allocating radio resources to the mobile terminal may include for the same set of mobile terminals served by different base stations Allocate physical resource blocks that are orthogonal to each other.

In an exemplary embodiment, analyzing the acquired information may include identifying a set of neighboring mobile terminals served by different base stations; and wherein allocating radio resources to the mobile terminal may include for neighboring mobile services served by different base stations The terminal set allocates physical resource blocks that are orthogonal to each other.

In an exemplary embodiment, transmitting radio resource allocation information regarding the mobile terminal may include transmitting via X2 interface signaling.

In a second aspect, embodiments of the present invention provide a scheduling method in a wireless communication system. The method includes: receiving radio resource allocation information about a serving mobile terminal; determining a radio resource allocated for the mobile terminal according to the radio resource allocation information; and scheduling the mobile terminal on the radio resource.

In a third aspect, an embodiment of the present invention provides a resource allocation device in a wireless communication system. The device includes: configured to acquire from each base station with each base station Means for communicating information associated with the mobile terminal; means for analyzing the acquired information; means for allocating radio resources to the mobile terminal based on the analysis; and for relating to the mobile terminal The radio resource allocation information is transmitted to the device of the mobile terminal's respective serving base station.

In a fourth aspect, an embodiment of the present invention provides a scheduling device in a wireless communication system. The apparatus includes: means for receiving radio resource allocation information about a serving mobile terminal; means for determining a radio resource allocated for the mobile terminal based on the radio resource allocation information; and for using on the radio resource Means for scheduling the mobile terminal.

With the technical solution described in the various embodiments of the present invention, the central controller is responsible for resource allocation to the eNB, and ^! The resource allocation information is sent to the corresponding eNB, and each eNB may process the UEs in the served UE set independently of each other according to the received resource allocation information, for example, scheduling or precoding. Thus, for example, distributed scheduling can be implemented. Further, after allocating radio resources for each eNB, the central controller not only transmits radio resource allocation information about the eNB to the corresponding eNB, but also may transmit radio resource allocation information about the UE's transmission eNB to the UE. The neighboring eNB can avoid resource collision when the neighboring eNB and the transmitting eNB perform UE scheduling. Furthermore, by identifying the same set of UEs served by different eNBs and allocating physical resource blocks that are orthogonal to each other for the same set of UEs served by different eNBs, inter-stream interference during multi-stream transmission can be avoided. In addition, inter-cell interference can be avoided by identifying a set of neighboring UEs that are served by different eNBs and allocating physical resource blocks that are orthogonal to each other for neighboring UE sets of different eNBs. DRAWINGS

The above and other objects, features and advantages of the present invention will become apparent from the Detailed Description Description

1 shows a flow chart of a resource allocation method according to an embodiment of the present invention; FIG. 2 shows an exemplary UE set configuration for data segmentation;

FIG. 3 illustrates a UE set configuration for avoiding inter-cell interference; FIG. 4 shows an example of a resource allocation request;

FIG. 5 is a flowchart showing a scheduling method according to an embodiment of the present invention;

Fig. 6 shows a specific example of a scheduling method of an embodiment of the present invention; and Fig. 7 shows an application scenario of a specific example of the scheduling method in Fig. 6. detailed description

Preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While the preferred embodiment of the present invention has been shown in the drawings the embodiments of the invention personnel.

In a first aspect, an embodiment of the present invention provides a resource allocation method in a wireless communication system. FIG. 1 shows a resource allocation method in a wireless communication system according to an embodiment of the present invention. This method can be performed by a central controller. The central controller can be placed in the eNB. For example, in a CoMP system, a plurality of interoperating eNBs may form a cooperative cluster, and a central controller may be disposed on an eNB in the cooperative cluster. As an alternative, the central controller can also be placed on a network node other than the eNB.

As shown in Fig. 1, first, in step S101, information associated with a UE served by each eNB is acquired from a plurality of eNBs. In the CoMP system, the plurality of eNBs may be a plurality of eNBs that cooperate with each other in one cooperative cluster. The information associated with the UE served by each eNB includes at least one of the following: a load condition of the UE, channel status information, and retransmission information. The channel state information may be one of long-term channel information and short-term channel information. The channel state information may be channel information of the UE transmitting base station to the UE. The channel state information may also be channel information of a neighboring base station of the UE to the UE.

In step S102, the acquired information is analyzed. In one embodiment, analyzing the acquired information includes identifying the same set of UEs served by different eNBs. In another embodiment, analyzing the acquired information includes identifying a set of neighboring UEs that are served by different eNBs. In step S103, a radio resource is allocated to the eNB based on the analysis. The radio resources may include time domain resources (e.g., subframes), frequency domain resources (e.g., physical resource blocks), and/or time-frequency domain resources. In one embodiment, allocating radio resources for an eNB includes allocating physical resource blocks that are orthogonal to each other for different eNBs serving the same set of UEs.

As mentioned earlier, a CoMP scheme based on non-ideal backhaul is being considered in SCE Rel-12. However, in addition to the non-ideal backhaul-based CoMP scheme, SCE Rel-12 may also consider the data splitting problem when the same UE receives data (including control plane information) from multiple cells. For example, the UE may receive data from multiple small cells or receive data from a small cell and a macro cell, respectively. Figure 2a shows an example of a data segmentation scenario. In the scenario shown in Figure 2a, cell 201 and cell 202 employ the same carrier frequency in the downlink transmission and are interconnected by a non-ideal backhaul. The UEs in the UE set 203 are UEs located at the edge of the cell 201 and the cell 202. When the UE in the UE set 203 simultaneously receives different data from the cell 201 and the cell 202, inter-stream interference occurs between the downlink from the cell 201 to the UE and the downlink from the cell 201 to the UE (inter - flow interference ). In order to avoid this inter-stream interference, a specific non-scheduled UE set of each of the cell 201 and the cell 202 may be allocated a physical resource block orthogonal to each other, as shown in Fig. 2b.

It should be understood that the benefits of data segmentation also include service balancing and cell edge throughput improvement. For example, if a UE with severe downlink load is at the edge of two severely loaded cells and only one cell is transmitting data to the UE, then in this case compared to the case where data transmission is provided for this user from two cells, The downlink download of the UE may take longer and affect the quality of service of other UEs of the transmitting cell.

With continued reference to step S103 in FIG. 1, in another embodiment, allocating radio resources for the eNB includes allocating physical resource blocks that are orthogonal to each other for different eNBs serving the set of neighboring UEs. Figure 3 shows an application scenario of this embodiment. In Figure 3a, cell 301 and cell 203 employ the same carrier frequency in the downlink transmission and are interconnected by a non-ideal backhaul. The UE in the UE set 303 and the UE in the UE set 304 are UEs located at the edge of the cell 301 and the cell 302, respectively, and are respectively used by the cell. 301 and cell 302 services. When the UE in the UE set 303 and the UE in the UE set 304 receive data from the cell 301 and the cell 302, respectively, inter-cell interference occurs between the two cells. In order to avoid inter-cell interference, orthogonal physical resource blocks may be allocated for a specific non-scheduled UE set and a scheduled UE set of each of the cell 301 and the cell 302, as shown in FIG. 3b. Thus, cell 301 and cell 302 can avoid scheduling neighboring cell edge UEs on the same time-frequency resource.

Still referring to step S103 in Figure 1, in yet another embodiment, allocating radio resources for the UE includes allocating non-orthogonal physical resource blocks for different sets of UEs served by the same eNB. In still another embodiment, allocating radio resources to a UE includes allocating non-orthogonal physical resource blocks for different sets of UEs served by different eNBs.

In step S104, radio resource allocation information about the eNB is transmitted to the corresponding serving eNB. In one embodiment, transmitting radio resource allocation information about the eNB includes transmitting via X2 interface signaling. The X2 interface signaling may take the form of, for example, a resource allocation request. Resource allocation requests may include but are not limited to:

· The identity of the sending node (eg the global eNB ID or cell ID of the transmitting eNB)

• The identity of the receiving node (eg receiving the global eNB ID or cell ID of the eNB)

• Cell ID

• Resource allocation information

• Subframe indication information

· PRB instructions

• UE's identity

One or more resource allocation information for one cell may be included in the resource allocation request. In the example shown in FIG. 4, the resource allocation request 401 includes three resource allocation information 402, 403, 404 for one cell. Resource allocation information 402 is associated with UE set 402a and scheduling resource block 402b. The resource allocation information 403 is associated with the UE set 403a and the scheduling resource block 403b. Resource allocation information 404 is associated with UE set 404a and scheduling resource block 404b.

Table 1 shows a specific example of a resource allocation request. IE/group name description

Message type

Global eNB ID of the sending node

Receive node's global eNB ID

Cell information

>Cell information item

»Cell ID The ID of the cell controlled by the receiving node or the ID of the neighboring cell of the cell controlled by the receiving node

>>Resource allocation information

Bit string (SIZE(40)). Each position in the bitmap represents a DL subframe.

»>Subframe indication

The value "1" indicates that the UE in the indicated UE set can be scheduled, and the value "0" indicates that the UE in the indicated UE set cannot be scheduled.

The first position in the "subframe indication" corresponds to subframe 0 in the radio frame, where SFN = "subframe indication" is continuously repeated in all radio frames. The maximum number of subframes is 40.

Bit string. Each position in the bitmap represents an n _PRB value (ie, first bit = PRB 0,

»>PRB indication

And so on, where the value "1" indicates that the UE in the indicated UE set can be scheduled, and the value "0" indicates that the UE in the indicated UE set cannot be scheduled. Indicating the UE set, the cell identified by the "cell ID" may consider the UE

»>UE Logo

The UE in the set performs scheduling.

Table 1

In an embodiment, the analyzing the acquired information in step S102 comprises identifying respective neighboring eNBs of the UE, and the method further comprises transmitting the radio resource allocation information about the eNB to the neighboring eNB of the transmitting eNB of the UE. . Therefore, after allocating radio resources for each eNB, the central controller not only transmits radio resource allocation information about the eNB to the corresponding eNB, but also can transmit radio resource allocation information about the eNB to the transmitting eNB of the UE. The neighboring eNB can avoid resource collision when the neighboring eNB and the serving eNB perform UE scheduling. It should be understood that the "transport eNB" is an eNB that points to the UE to transmit data, and includes not only a serving eNB that establishes a connection with the UE, but also a non-serving eNB that includes the UE. In a second aspect, embodiments of the present invention provide a scheduling method in a wireless communication system. This scheduling method can be implemented at the eNB. FIG. 5 shows a flow chart of a scheduling method of an embodiment of the present invention. As shown in FIG. 5, in step S501, the eNB receives radio resource allocation information about the eNB from the central controller. In one embodiment, the central controller transmits radio resource allocation information about the eNB to the serving eNB of the UE via X2 interface signaling, the eNB receiving its radio resource allocation information via X2 interface signaling. The resource allocation information includes at least one of the following: an identifier of the UE, indication information of a radio subframe for the UE, and indication information of a physical resource block. In step S502, the eNB determines, according to the radio resource allocation information, a radio resource to be allocated for the UE. In step S503, the eNB selectively schedules the UE on the radio resource. In other words, the eNB may decide whether to schedule the UE on the radio resource.

In an embodiment, if the resource allocation information includes only the identifier of the UE, and does not include the indication information of the radio subframe and the indication information of the physical resource block, the eNB may be on all the time-frequency resources indicated in the resource allocation information. The UE in the UE set is scheduled.

In another embodiment, if the resource allocation information includes the indication information of the wireless subframe and/or the indication information of the physical resource block, and does not include the identifier of the UE, the eNB may indicate the information in the wireless subframe and/or All the serving UEs of the eNB are scheduled on the time-frequency resource indicated by the indication information of the physical resource block.

In another embodiment, if the eNB does not receive any resource allocation information from the central controller, the eNB may schedule the serving UE of the eNB on any time-frequency resource.

FIG. 6 shows a specific example of a scheduling method of an embodiment of the present invention. In Figure 6, a transmission point (TP) 601 and a transmission point 602 use CoMP techniques to transmit data to a set of UEs (not shown). Transmission point 601 receives CSI feedback from its serving UE and is provided with a local scheduler. Transmission point 602 receives CSI feedback from its serving UE and is provided with a local scheduler. Central controller 603 of transmission point 601 and transmission point 602 is responsible for allocating radio resources for transmission point 601 and transmission point 602. The transmission point 601 and the transmission point 602 receive the resource allocation from the central controller 603, respectively. Resource allocation requests 604 and 605 for information. Transmission point 601 and transmission point 602 parse the received resource allocation requests 604 and 605, respectively, to determine the radio resources to be allocated for their pre-scheduled UE set based on the resource allocation information therein. Transmission point 601 and transmission point 602 may decide whether to schedule UEs in their respective pre-scheduled UE sets on the determined radio resources. If it is decided to perform scheduling of the UE, the transmission point 601 and

The UE performs scheduling.

As previously mentioned, if the central controller identifies transmission point 601 and transmission point 602 as transmission points serving the same set of UEs, the central controller will allocate a set of serving UEs for transmission point 601 and a set of serving UEs for transmission point 602. Physical resource blocks orthogonal to each other, as shown in FIG. Thus, transmission point 601 and transmission point 602 can schedule UEs in the same UE set on physical resource blocks that are orthogonal to each other to avoid inter-stream interference.

In a third aspect, an embodiment of the present invention provides a resource allocation device in a wireless communication system, comprising: means for acquiring information associated with a mobile terminal served by each base station from a plurality of base stations; Means for analyzing the acquired information; means for allocating radio resources to the mobile terminal based on the analysis; and means for transmitting radio resource allocation information about the base station to a corresponding base station.

In one embodiment, the means for analyzing the acquired information comprises means for identifying respective neighboring base stations of the mobile terminal.

In one embodiment, the apparatus further comprises: means for transmitting radio resource allocation information about the base station to a neighboring base station of a transmission base station of the mobile terminal.

In an embodiment, the radio resource allocation information includes at least one of the following: an identifier of the mobile terminal, indication information of the radio subframe, and indication information of the physical resource block.

In one embodiment, means for analyzing the acquired information comprises means for identifying a same set of mobile terminals served by different base stations; and wherein means for allocating radio resources for said base station comprises for For the same set of mobile terminals A device in which different base stations of a service allocate physical resource blocks that are orthogonal to each other.

In one embodiment, means for analyzing the acquired information comprises means for identifying a set of neighboring mobile terminals served by different base stations; and wherein means for assigning radio resources to said base station comprises Means for allocating mutually orthogonal physical resource blocks for different base stations serving adjacent sets of mobile terminals.

In one embodiment, means for transmitting radio resource allocation information for the base station includes means for transmitting via X2 interface signaling.

In a fourth aspect, an embodiment of the present invention provides a scheduling apparatus in a wireless communication system, including: means for receiving radio resource allocation information about a base station; and determining, according to the radio resource allocation information, that Means for assigning radio resources to the set of mobile terminals; and means for scheduling mobile terminals in the set of mobile terminals on the radio resources.

In one embodiment, means for receiving radio resource allocation information for a base station includes means for receiving via X2 interface signaling.

It will be understood that the terms "base station", "eNode B", "transport point" are used interchangeably as used herein without affecting the scope of protection of the claims.

In addition, it should be understood that aspects of the invention may be implemented in any form, including: (a) pure hardware circuit implementations (eg, implementations in analog and/or digital circuits), (b) circuits and stored in a Or a combination of computer program products comprising software and/or firmware instructions on a plurality of computer readable memories, the computer readable memories working together to cause the resource allocation device and/or the scheduling device to perform one or more of the functions described herein; (C) Pure software implementation (including firmware, resident software, microcode, etc.).

Claims

Claim

A method for resource allocation in a wireless communication system, comprising:

Acquiring information associated with the mobile terminal served by each base station from a plurality of base stations; analyzing the acquired information;

Allocating radio resources to each of the base stations based on the analysis;

Transmitting radio resource allocation information about the base station to a corresponding base station.

2. The method of claim 1, wherein analyzing the acquired information comprises identifying respective neighboring base stations of the mobile terminal.

3. The method of claim 2, further comprising:

Radio resource allocation information about a transmission base station of the mobile terminal is transmitted to respective neighboring base stations of the mobile terminal.

The method according to claim 1, wherein the radio resource allocation information comprises at least one of: an identifier of a mobile terminal, indication information of a radio subframe, and indication information of a physical resource block.

5. The method of claim 4, wherein analyzing the acquired information comprises identifying a same set of mobile terminals served by different base stations;

The allocating radio resources for the base station includes allocating physical resource blocks orthogonal to each other for different base stations serving the same set of mobile terminals.

6. The method of claim 4, wherein analyzing the acquired information comprises identifying a set of neighboring mobile terminals served by different base stations; and

The allocating radio resources for the base station includes allocating physical resource blocks orthogonal to each other for different base stations serving adjacent sets of mobile terminals.

7. The method of claim 1, wherein the information associated with the mobile terminal comprises at least one of: a load condition of the mobile terminal, channel state information, and retransmission information.

The method according to any one of claims 1 to 7, wherein transmitting radio resource allocation information about the mobile terminal comprises transmitting via X2 interface signaling.

9. A scheduling method in a wireless communication system, comprising: Receiving radio resource allocation information about the base station;

Determining, according to the radio resource allocation information, a radio resource to be allocated for the set of mobile terminals; and

The mobile terminal in the set of mobile terminals is scheduled on the radio resource.

10. The method of claim 9, wherein the radio resource allocation information comprises at least one of: an identity of a mobile terminal, indication information of a wireless subframe, and indication information of a physical resource block.

The method according to claim 9 or 10, wherein receiving the radio resource allocation information about the serving mobile terminal comprises receiving via X2 interface signaling.

12. A resource allocation device in a wireless communication system, comprising:

Means for acquiring information associated with mobile terminals served by each base station from a plurality of base stations;

Means for analyzing the acquired information;

Means for allocating radio resources to each of said base stations based on said analysis; and

Means for transmitting radio resource allocation information about the base station to the base station.

13. Apparatus according to claim 12, wherein the means for analyzing the acquired information comprises means for identifying respective neighboring base stations of the mobile terminal.

14. The device of claim 13, further comprising:

Means for transmitting radio resource allocation information about a transmission base station of the mobile terminal to respective neighboring base stations of the mobile terminal.

The device according to claim 12, wherein the radio resource allocation information comprises at least one of: an identifier of a mobile terminal, indication information of a radio subframe, and indication information of a physical resource block.

16. The apparatus of claim 15, wherein the means for analyzing the acquired information comprises means for identifying a same set of mobile terminals served by different base stations; The means for allocating radio resources to the base station includes means for allocating mutually orthogonal physical resource blocks for different base stations serving the same set of mobile terminals.

17. Apparatus according to claim 15 wherein the means for analyzing the acquired information comprises means for identifying a set of adjacent mobile terminals served by different base stations;

Means for allocating radio resources to the base station include means for allocating mutually orthogonal physical resource blocks for different base stations serving a set of neighboring mobile terminals.

The apparatus according to any one of claims 12 to 17, wherein the means for transmitting radio resource allocation information about the mobile terminal comprises means for transmitting via X2 interface signaling.

19. A scheduling device in a wireless communication system, comprising:

Means for receiving radio resource allocation information about a base station;

Means for determining a radio resource to be allocated for the set of mobile terminals based on the radio resource allocation information;

Means for scheduling mobile terminals in the set of mobile terminals on the radio resource.

20. The apparatus of claim 19, wherein the radio resource allocation information comprises at least one of: an identification of a mobile terminal, indication information of a radio subframe, and indication information of a physical resource block.

21. Apparatus according to claim 19 or 20, wherein the means for receiving radio resource allocation information for the serving mobile terminal comprises means for receiving via X2 interface signaling.