CN103945480B - Eliminate the method, apparatus and system disturbed in heterogeneous network between picocell and highspeed user's equipment - Google Patents
Eliminate the method, apparatus and system disturbed in heterogeneous network between picocell and highspeed user's equipment Download PDFInfo
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Abstract
It is an object of the invention to provide the method, apparatus and system disturbed between a kind of elimination picocell and highspeed user's equipment for heterogeneous network.Wherein, the heterogeneous network includes macrocell and picocell, and both have geographical same overlay area, when highspeed user's equipment corresponding to the macrocell enters the coverage of the picocell, the picocell is that highspeed user's device configuration retains resource, to eliminate the interference between the picocell and highspeed user's equipment；The macrocell is communicated in the reservation resource with highspeed user's equipment.Picocell retain resource on macrocell coordination come eliminate for/in the macrocell highspeed user's equipment interference, avoid the frequent switching in heterogeneous network, reduce the quantity of aerial signaling, so as to improve the efficiency of heterogeneous network, and the continuity of highspeed user's device service is ensure that as far as possible so that highspeed user's equipment obtains more preferable experience.
Description
Technical Field
The invention relates to the technical field of mobile communication, in particular to a technology for eliminating interference between a pico cell and high-speed user equipment for a heterogeneous network.
Background
Recently, heterogeneous networks (hetnets) are widely discussed in 3GPP LTE-a (long termeevolution advanced) for improving system performance. Small cells (small cells) have been widely accepted in LTE, which is a promising technology capable of significantly improving cell capacity. Also, the commercial use of small cells is attractive to operators all over the world.
However, due to the addition of small cells in the system, the different coverage areas of the cells pose a serious problem in mobility management of heterogeneous networks. The introduction of small cells, such as pico cells (pico cells), will create additional interference and also cause more frequent handovers due to the smaller coverage of the pico cells.
Currently, when an active ue moves from a macro cell (macro cell) to a pico cell, if it meets a handover condition, a normal handover procedure is triggered, which is defined by 3gpp ts 36.300. And, the path of the user plane is handed over from the macro cell to the pico cell by a Serving Gateway (SGW) through a series of RRC signaling, X2 signaling, and S1 signaling.
Likewise, another handover procedure is also performed when the active ue moves from the pico cell to the macro cell. Also, the path of the user plane is switched back from the pico cell to the macro cell by the SGW, also through the above-described over-the-air signaling.
In summary, since pico cells have a relatively small coverage, existing schemes will produce more frequent handovers, resulting in more over-the-air signaling and a poorer user experience. Therefore, for heterogeneous network scenarios, a more efficient solution is needed.
Disclosure of Invention
To avoid unnecessary over-the-air handovers and ping-pong effects, a consensus has been reached: when a user equipment approaches a small cell, a high speed user equipment should not be handed over to the small cell. However, if not handed over to a small cell, the high speed user equipment may experience strong interference when passing through the small cell. The invention aims to provide a method, a device and a system for eliminating interference between a pico cell and high-speed user equipment for a heterogeneous network.
According to an aspect of the present invention, there is provided a method for eliminating interference between a pico cell and a high speed user equipment in a heterogeneous network, wherein the heterogeneous network comprises the macro cell and the pico cell, and the macro cell and the pico cell both have geographic same coverage area, and the high speed user equipment comprises the user equipment of which the speed exceeds a predetermined threshold, wherein the method comprises:
a, when high-speed user equipment corresponding to the macro cell enters the coverage area of the pico cell, the pico cell configures reserved resources for the high-speed user equipment so as to eliminate the interference between the pico cell and the high-speed user equipment;
b the macro cell communicates with the high speed user equipment on the reserved resources.
According to another aspect of the present invention, there is also provided an apparatus for eliminating interference between a pico cell and a high speed user equipment in a heterogeneous network, wherein the heterogeneous network includes the pico cell and a macro cell having a same geographical coverage area as the pico cell, and the high speed user equipment includes a user equipment whose speed exceeds a predetermined threshold, wherein the apparatus includes:
resource allocation means, configured to allocate reserved resources for the high-speed user equipment when the high-speed user equipment corresponding to the macro cell enters the coverage of the pico cell, so as to eliminate interference between the pico cell and the high-speed user equipment;
and the resource indicating device is used for sending the indication information about the reserved resources to the macro cell so as to communicate with the high-speed user equipment on the reserved resources by the macro cell.
According to still another aspect of the present invention, there is also provided an apparatus for assisting a pico cell of a macro cell in a heterogeneous network to cancel interference between the macro cell and a high speed user equipment, wherein the heterogeneous network includes the macro cell and the pico cell having a geographical same coverage area as the macro cell, and the high speed user equipment includes a user equipment whose speed exceeds a predetermined threshold, wherein the apparatus includes:
an indication transceiver, configured to receive, from the pico cell, indication information of reserved resources configured for the high-speed user equipment when the high-speed user equipment corresponding to the macro cell enters a coverage area of the pico cell;
communication means for communicating with the high speed user equipment on the reserved resources.
According to still another aspect of the present invention, there is also provided a system for a heterogeneous network to cancel interference between a pico cell and a high speed user equipment, wherein the heterogeneous network includes the macro cell and the pico cell, and both have a geographic same coverage area, and the high speed user equipment includes a user equipment whose speed exceeds a predetermined threshold, wherein the system includes the aforementioned apparatus for canceling interference between the pico cell and the high speed user equipment in the heterogeneous network according to another aspect of the present invention, and the aforementioned apparatus for assisting the pico cell to cancel interference between the pico cell and the high speed user equipment in the macro cell in the heterogeneous network according to still another aspect of the present invention.
Compared with the prior art, the invention provides an effective solution for the movement of high-speed user equipment in a heterogeneous network, wherein a pico cell is coordinated with a macro cell on the reserved resources to eliminate the interference to/from the high-speed user equipment in the macro cell. The invention avoids frequent switching in the heterogeneous network, reduces the number of air signaling, thereby improving the efficiency of the heterogeneous network, ensuring the continuity of the service of the high-speed user equipment as much as possible and leading the high-speed user equipment to obtain better experience.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
FIG. 1 illustrates an exemplary application scenario in accordance with the present invention;
fig. 2 is a flowchart illustrating a method for eliminating interference between a pico cell and a high speed ue by coordinating the macro cell and the pico cell in a heterogeneous network according to a preferred embodiment of the present invention;
fig. 3 is a flowchart illustrating a method for eliminating interference between a pico cell and a high speed user equipment by coordinating the macro cell and the pico cell in a heterogeneous network according to another preferred embodiment of the present invention;
fig. 4 is a schematic diagram of an apparatus of a base station of a macro cell and a pico cell cooperating to eliminate interference between the pico cell and high speed user equipment in a heterogeneous network according to a preferred embodiment of the present invention.
The same or similar reference numbers in the drawings identify the same or similar elements.
Detailed Description
The present invention is described in further detail below with reference to the attached drawing figures.
Based on the existing handover process, the present invention proposes an improved solution to achieve efficient mobility management in heterogeneous network scenarios. In addition to the scheme of handing over one or more user equipments belonging to a macro cell to a pico cell, in the case where the user equipments pass through the pico cell, the present invention provides another scheme: the user equipments are still served by the macro cell on some specific resources while the pico cell will reserve these resources to cancel the interference it generates to/from the user equipments on the downlink/uplink.
As shown in fig. 1, the heterogeneous network includes a macro cell 10 and a pico cell 20, both of which have geographically identical coverage areas. Here, geographically co-covering means that the macro cell 10 and the pico cell 20 have the same coverage area in geographic location. The user equipments 3 and 4 correspond to the macro cell 10, i.e. the user equipments 3 and 4 are in the coverage of the macro cell 10 and their movement path will pass through the pico cell 20.
Here, it is possible to determine whether the user equipments 3 and 4 belong to the high speed user equipment by setting a predetermined threshold. And, the predetermined threshold value can be adjusted according to a specific application scenario. The macro cell 10 may obtain the mobility state information of the user equipment in a variety of ways, such as the mobility state information of the user equipment may be reported by the user equipment to the macro cell 10, or obtained by the macro cell 10 according to other ways, such as estimation from a sound reference signal. For example, the macro cell 10 configures a measurement report of the ue, and adds an additional mobility threshold to assist the ue to determine its mobility state, such as a high-speed ue or a low-speed ue; the user equipment then adds information about its mobility state to the macro cell 10 when reporting measurement reports to it. Hereinafter, for convenience of describing the present invention, the user equipment 3 is exemplified as belonging to a high speed user equipment, and it is labeled as the high speed user equipment 3.
When the high speed ue 3 enters the coverage of the pico cell 20, the pico cell 20 configures a reserved resource (reserved resource) for the high speed ue 3 to eliminate the interference between the pico cell 20 and the high speed ue 3. Here, the resource utilization pattern (resource utilization pattern) of the reserved resources may have various granularities, such as a subframe (subframe) utilization pattern. Smaller granularity, such as Resource Block (RB) utilization mode, may also be used in consideration of Quality of Service (QoS) and other factors. The resource utilization pattern may be composed of two parts, including a resource utilization pattern for the downlink and a resource utilization pattern for the uplink. For convenience of describing the present invention, the subframe utilization pattern is exemplified.
The macro cell 10 communicates with the high speed user equipment 3 on the reserved resources. For example, the macro cell 10 reconfigures the high speed ue 3 through RRC signaling, and schedules the high speed ue 3 on the reserved resources.
For the reserved subframe, on the downlink, the pico cell 20 will not transmit any wireless signal, and meanwhile, the macro cell 10 may schedule on the reserved subframe to transmit data to the high-speed user equipment 3, so as to eliminate the interference caused by the pico cell 20 to the high-speed user equipment 3; on the uplink, the pico cell 20 may also reserve certain resources, and the high speed user equipment 3 may transmit uplink data to the macro cell 10 on the reserved resources to eliminate interference of the high speed user equipment 3 on the pico cell 20. Thus, interference on the uplink/downlink with the high speed user equipment 3 by the pico cell 20 can be eliminated. For other subframes, the pico cell 20 may still be scheduled normally.
Subsequently, when the high speed user equipment 3 leaves the coverage of the pico cell 20, the macro cell 10 will inform the pico cell 20 to stop configuring the reserved resources for the high speed user equipment 3.
Fig. 2 is a flowchart of a method for coordinating a macro cell and a pico cell in a heterogeneous network to eliminate interference between the pico cell and a high speed user equipment according to a preferred embodiment of the present invention.
Referring to fig. 1, the pico cell 20 is within the coverage of the macro cell 10, i.e., both have the same geographic coverage area. The high speed user equipment 3 is in the coverage of the macrocell 10 and its path of movement will pass through the picocell 20.
In step S201a, the macro cell 10 configures the user equipment in its coverage area with measurement parameters, which may help in controlling the function of the connection mobility of the user equipment. In step S201b, when a predetermined rule is satisfied, the ue is triggered to report a corresponding measurement report to the macrocell 10 according to the measurement parameters configured by the macrocell 10.
In step S202, the macro cell 10 makes a handover decision for the corresponding ue according to the measurement report reported by the ue and RRM (Radio resource management) information.
The above procedure is the same as the corresponding existing procedure defined by LTE-Advanced and is not described in detail here.
In step S203, when a specific ue is selected for HANDOVER and a certain condition is satisfied, for example, the selected ue is a high speed ue, the macro cell 10 sends a HANDOVER REQUEST (HANDOVER REQUEST) for the selected high speed ue to the pico cell 20 to deliver necessary information to the pico cell 20 for HANDOVER preparation. The information includes X2 signaling context of the ue, S1EPC (Evolved Packet Core) signaling context of the ue, RRC (Radio Resource Control) context, and QoS information. Of course, indication information of high speed user equipment passing through the pico cell 20 should also be included.
Here, the macro cell 10 may select one or more user equipments for handover as long as it satisfies the handover condition. Preferably, the aforementioned handover condition may further include that the stay time of the selected user equipment in the pico cell 20 is similar. Further, the macro cell 10 may first group the selected high speed ues and send a handover request to the pico cell 20 for the group of high speed ues.
For convenience of explanation, the following description will be given by way of example in which the macro cell 10 selects one high-speed user equipment 3 to request handover from the pico cell 20. However, it will be understood by those skilled in the art that these examples are for illustrative purposes only and should not be construed as limiting the present invention, i.e., the present invention is equally applicable to the case of selecting multiple high speed ue for handover.
In step S204, after receiving its handover request for the high speed user equipment 3 from the macro cell 10, the pico cell 20 configures reserved resources for the high speed user equipment 3 in response to the handover request. Based on the QoS information of the received E-RAB (Enhanced-Radio Access bearer) and the Radio resources of the pico cell 20, the pico cell 20 performs policy selection and Access control. Here, the pico cell 20 decides to resolve the handover request, but selects an interference cancellation mechanism co-scheduled with the macro cell 10, for example, the pico cell 20 configures reserved resources, such as reserved specific subframes, for the high speed ue 3 requested to handover, so that the macro cell can provide services for the high speed ue 3 on the reserved resources. In the reserved subframe, the pico Cell 20 still needs to transmit at least a Cell-specific reference Signal (CRS).
In step S205, the pico cell 20 sends a handover resolution message corresponding to its handover request to the macro cell 10, where the handover resolution message includes indication information of reserved resources configured for the high-speed user equipment 3 requesting handover. For example, the pico cell 20 sends a handover request Negative Acknowledgement (NACK) message to the macro cell, wherein the NACK message carries the resource utilization pattern of the reserved resources configured by the pico cell 20 for the high-speed user equipment 3 requesting handover. Preferably, the handover resolution message may also carry other information, for example, in a case of requesting handover to a high speed ue group, the pico cell 20 may decide to perform handover only to a part of the high speed ues therein, that is, configure reserved resources for other high speed ues in the high speed ue group, so that the handover resolution message may also include an updated high speed ue group (including the high speed ues for which the pico cell 20 configures reserved resources), identification information thereof, and an associated subframe utilization mode.
After receiving the handover reject message sent by the pico cell 20 corresponding to the previous handover request, the macro cell 10 provides the service to the high speed user equipment 3 on the reserved resources configured by the pico cell 20 according to the indication information of the reserved resources included therein, so as to avoid interference to/from the pico cell 20. In step S206a, after receiving the NACK message, the macro cell 10 configures a restricted measurement report of RRM/RLM (Radio link monitoring)/CSI (Channel state information) for the high-speed ue 3 passing through the pico cell 20 through RRC signaling. In step S206b, the high speed ue 3 is triggered to report a corresponding measurement report to the macro cell 10 according to the configured RRM/RLM/CSI restriction parameter according to a predetermined rule.
In step S207, the macro cell 10 determines whether the high speed user equipment 3 has moved out of the pico cell 20 based on the received RLM-limited measurement report. One exemplary decision condition is shown below:
if the Reference Signal Receiving Power (RSRP) of the pico cell is less than the Reference signal receiving Power-T of the macro cell, i.e., RSRP (pico cell) < RSRP (macro cell) -T, the high speed user equipment 3 is out of the coverage of the pico cell, where T is a predetermined threshold.
When it is determined that the high speed user equipment 3 moves out of the coverage of the pico cell 20, the macro cell 10 sends a notification message to the pico cell 20 about stopping the configuration of the reserved resources for the high speed user equipment 3, for example, the macro cell 10 sends a "stop coordination Request" message to the pico cell 20, wherein the notification message carries the identification information of the high speed user equipment 3.
For the case where there are multiple high speed user equipments requesting handover, when all the high speed user equipments are out of the coverage of the pico cell 20, the macro cell 10 sends a notification message to the pico cell 20 about stopping configuring the reserved resources for these high speed user equipments.
In step S208, the pico cell 20 stops the configuration of the reserved resource for the coordinated scheduling with the macro cell 10 according to the notification message sent by the macro cell 10. That is, the pico cell 20 stops the configuration of the reserved subframes for the high speed user equipment 3 and returns to normal operation.
In step S209, the pico cell 20 transmits a "stop coordination Request acknowledgement (StopCoordination Request acknowledgement)" message to the macro cell 10.
In step S210, the macro cell 10 reconfigures the channel condition measurement report for the high speed ue 3 and resumes normal operation.
Fig. 3 is a flow chart of a method according to another preferred embodiment of the present invention, which illustrates a procedure for a macro cell and a pico cell in a heterogeneous network to cancel interference between the pico cell and a high speed user equipment.
Still referring to fig. 1, the pico cell 20 is within the coverage of the macro cell 10, i.e., both have the same geographic coverage area. The high speed user equipment 3 is in the coverage of the macrocell 10 and its path of movement will pass through the picocell 20.
Fig. 3 shows a preferred embodiment for avoiding interference between the pico cell 20 and the high speed user equipment 3 by using ABS (almost blank subframe) at the pico cell 20. Thus, this picocell 20-directed ABS configuration procedure can be used to solve the problem of strong interference generated when high-speed user equipment 3 in a macrocell 10 passes through the coverage area of a picocell 20.
Specifically, in step S301a, the macro cell 10 configures a measurement report for all the ues in its coverage area, and adds a mobility threshold to assist the ues in determining their mobility status, i.e. high speed ues or low speed ues. The threshold is determined by the macro cell 10 and may be adjusted to the actual situation.
In step S301b, when the high speed user equipment 3 approaches the pico cell 20, since the RSRP received from the pico cell is stronger than the RSRP received from the macro cell 10, an A3 event is triggered, and the high speed user equipment 3 reports a measurement report to the macro cell 10. In addition to the usual measurement parameters, the high speed ue 3 sends high speed ue indication information to the macro cell 10, for example, by adding a high speed ue indicator to the measurement report, which may occupy one bit and indicate high speed ue with "1" and low speed ue with "0" to inform the macro cell 10 that it should be avoided to handover to the pico cell 20. The estimate of the mobility state of the user equipment may be obtained by counting the number of times a handover of the user equipment occurs within a predetermined time. An exemplary a3 event is shown below:
Mn+Ofn+Ocn-Hys＞Mp+Ofp+Ocp+Off
where Mn is the measurement result for the neighbor cell, without considering any offset;
ofn is the frequency specific offset of the neighbouring cell, i.e. the offset frequency parameter (offsetFreq) defined in the measurement configuration of EUTRA (measObjectEUTRA), which corresponds to the frequency of the neighbouring cell;
ocn is a cell-specific offset of the neighboring cell, i.e. a cell-specific offset parameter (celllndividualoffset) defined in the measurement configuration of EUTRA (measObjectEUTRA), and is set to 0 if not configured for a neighboring cell;
mp is the measurement result for the primary serving cell, without considering any offset;
ofp is the frequency specific offset of the primary serving cell, i.e. the offset frequency parameter (offsetFreq) defined in the measurement configuration of EUTRA (measObjectEUTRA), which corresponds to the carrier frequency of the primary serving cell;
ocp is the cell specific offset of the primary serving cell, i.e. the cell specific offset parameter (celllndividualoffset) defined in the measurement configuration of EUTRA (measObjectEUTRA), if not configured for pico cells, Ocp is set to 0;
hys is a hysteresis parameter for the event, i.e. a hysteresis parameter defined for the event in the reporting configuration of EUTRA (reportConfigEUTRA);
off is an offset parameter for the event, i.e. the a3 offset defined for the event in the reporting configuration for EUTRA (reportConfigEUTRA).
In step S302, upon receiving the measurement report triggered by the a3 event, the macro cell 10 ranks the mobility state of the user equipment according to the high speed user equipment indicator therein. At the same time, the macro cell 10 will detect the type of target cell potentially being handed over, i.e. the target cell is a macro cell or a pico cell, which will cause strong interference to the user equipment within the macro cell 10.
According to the mobility state class of the user equipment, the macro cell 10 will perform the following operations:
1) for low speed user equipment, the macro cell 10 will initiate a handover operation;
2) for high speed user equipment, the macrocell 10 will request from the picocell 20 to configure reserved resources for it without handing it over to the picocell 20.
In step S303, for the high speed user equipment 3, the macro cell 10 sends a configuration Request for configuring the reserved resources for the high speed user equipment 3 to the target pico cell, for example, the macro cell 10 sends an "ABS on Request (ABSTurn-on Request)" message to the pico cell 20. Preferably, when the macro cell 10 is currently providing a VoIP (voice over internet Protocol) service for the high-speed user equipment 3, the ABS on request may further include a next transmission time message of the VoIP service.
In step S304, the pico cell 20 configures reserved resources, such as ABS, for the high speed user equipment 3 in response to the configuration request sent by the macro cell 10. Depending on the current ABS status of the pico cell 20, the pico cell 20 will perform the following operations, respectively:
1) if the pico cell 20 has not configured ABS and the high speed ue 3 is using VoIP service, the pico cell 20 determines which subframe to use when configuring ABS for the high speed ue 3 according to the next transmission time message of the high speed ue 3 in the ABS start request and the VoIP data transmission interval;
2) if the pico cell 20 is not currently configured with ABS and the high speed user equipment 3 is not using VoIP service, the pico cell 20 may configure any subframe as a reserved subframe;
3) if the pico cell 20 has currently configured ABS and the ABS turn-on request it receives is not for a high speed ue using VoIP service, the pico cell 20 does not need to additionally configure reserved subframes for the high speed ue;
4) if the pico cell 20 has currently configured ABS and the ABS on request it receives is for a high speed ue using VoIP service, the pico cell 20 reconfigures the ABS according to the next transmission time message of the high speed ue 3 in the ABS on request.
In step S305, the pico cell 20 transmits indication information on the reserved resources configured for the high speed user equipment 3 to the macro cell 10. For example, after the pico cell 20 configures or reconfigures the ABS for the high-speed ue 3, the pico cell 20 sends the indication information of the configured ABS to the macro cell 10 through the existing X2ABS load related message.
In step S306, after the macro cell 10 receives the indication information of the configured ABS from the pico cell 20, the macro cell 10 resets the measurement configuration information through RRC signaling and makes a corresponding scheduling decision according to the configured ABS.
Since the ABS is adopted in the pico cell 20 to protect the high speed ue 3 in the macro cell 10, the ABS should be stopped when the high speed ue 3 leaves the pico cell 20 to avoid wasting resources. In step S307, the macro cell 10 detects whether the high-speed user equipment 3 is still in the coverage of the pico cell 20, and when it leaves the pico cell 20, sends a notification message to the pico cell 2 about stopping configuring the reserved resource, for example, sends an "ABS Turn-off Request" message to the pico cell 20. Here, there are at least 2 ways to detect whether the high speed user equipment 3 is out of the coverage of the pico cell 20, so that the pico cell 20 stops configuring its ABS:
1) when the high-speed user equipment 3 detects that the RSRP (Reference signal receiving power) or RSRQ (Reference signal receiving Quality) received by the high-speed user equipment 3 is lower than a corresponding predetermined threshold, the high-speed user equipment 3 sends a specific message to the affiliated macro cell 10 to indicate that the interference from the pico cell 20 is currently small, so as to inform the pico cell 20 to stop ABS configuration;
2) when the macro cell 10 receives another measurement report triggered by an A3 event, where the identification information of the target cell is different from the identification information of the pico cell in the measurement report of the A3 event triggered by the high speed ue 3, the macro cell 10 knows that the high speed ue 3 has left the pico cell 20, and can inform the pico cell 20 to stop ABS configuration.
In step S308, after receiving the ABS shutdown request sent by the macro cell 10, the pico cell 20 determines whether to stop configuring the ABS according to the other received ABS startup requests.
Fig. 4 is a schematic diagram of an apparatus according to a preferred embodiment of the present invention, which illustrates a base station of a macro cell and a pico cell cooperating to eliminate interference between the pico cell and high-speed user equipment in a heterogeneous network.
In this context, the macro cell and the corresponding base station, i.e. the "macro cell base station" are used equally and not distinguished. Similarly, the pico-cell and its corresponding base station, i.e., the "pico-cell base station" are also used equally and are not distinguished.
Referring to fig. 1, the pico cell 20 is within the coverage of the macro cell 10, i.e., both have the same geographic coverage area. The high speed user equipment 3 is in the coverage of the macrocell 10 and its path of movement will pass through the picocell 20.
As shown in fig. 4, the macrocell base station 10 includes an instruction transceiver device 101 and a communication device 102; the picocell base station 20 includes a resource configuration means 201 and a resource indication means 202.
When the high speed ue 3 enters the coverage of the pico cell 20, the resource allocating device 201 of the pico cell base station 20 allocates reserved resource (reserved resource) for the high speed ue 3 to eliminate the interference between the pico cell 20 and the high speed ue 3. Here, the resource utilization pattern (resource utilizations pattern) of the reserved resources may have various granularities, such as a subframe (subframe) utilization pattern. Smaller granularity, such as Resource Block (RB) utilization mode, may also be used in consideration of quality of Service (QoS) and other factors. The resource utilization pattern may be composed of two parts, including a resource utilization pattern for the downlink and a resource utilization pattern for the uplink. For convenience of describing the present invention, the subframe utilization pattern is exemplified.
Subsequently, the resource instruction device 202 of the picocell base station 20 sends instruction information of the reserved resources configured for the high-speed user equipment 3 to the macrocell 10. Accordingly, the instruction transceiver device 101 of the macrocell base station 10 receives the instruction information on the reserved resources from the picocell 20.
The communication means 102 of the macrocell base station 10 communicates with the high speed user equipment 3 on the reserved resources. For example, the communication device 102 reconfigures the high speed user equipment 3 through RRC signaling, and schedules the high speed user equipment 3 on the reserved resource.
For the reserved subframe, on the downlink, the pico cell 20 will not transmit any wireless signal, and meanwhile, the macro cell 10 may schedule on the reserved subframe to transmit data to the high-speed user equipment 3, so as to eliminate the interference caused by the pico cell 20 to the high-speed user equipment 3; on the uplink, the pico cell 20 may also reserve certain resources, and the high speed user equipment 3 may transmit uplink data to the macro cell 10 on the reserved resources to eliminate interference of the high speed user equipment 3 on the pico cell 20. Thus, interference on the uplink/downlink with the high speed user equipment 3 by the pico cell 20 can be eliminated. For other subframes, the pico cell 20 may still be scheduled normally.
When the high speed user equipment 3 leaves the coverage of the pico cell 20, the macro cell 10 may also notify the pico cell 20 to stop configuring the reserved resources for the high speed user equipment 3.
In a preferred application scenario of the macro cell base station 10 and the pico cell base station 20 shown in fig. 4, the pico cell base station 20 determines whether to configure reserved resources for the high speed user equipment 3.
In particular, the macro cell 10 configures the user equipment within its coverage area with measurement parameters that may help control the functionality of the connected mobility of the user equipment. When a predetermined rule is satisfied, the ue is triggered to report a corresponding measurement report to the macro cell 10 according to the measurement parameters configured by the macro cell 10.
The macro cell 10 makes a handover decision for the corresponding ue according to the measurement report reported by the ue and RRM (Radio resource management) information.
When a specific ue is selected for handover and a certain condition is satisfied, for example, the selected ue is a high speed ue, the instruction transceiver 101 of the macrocell base station 10 sends a handover request (handover request) for the selected high speed ue to the picocell 20 to transfer necessary information to the picocell 20 for its handover preparation. These information include the X2 signaling context of the user equipment, the S1EPC signaling context of the user equipment, the RRC context, and QoS information. Of course, indication information of high speed user equipment passing through the pico cell 20 should also be included.
Here, the macro cell 10 may select one or more user equipments for handover as long as it satisfies the handover condition. Preferably, the aforementioned handover condition may further include that the stay time of the selected user equipment in the pico cell 20 is similar. Further, the macro cell 10 may first group the selected high speed ues and send a handover request to the pico cell 20 for the group of high speed ues.
For convenience of explanation, the following description will be given by way of example in which the macro cell 10 selects one high-speed user equipment 3 to request handover from the pico cell 20. However, it will be understood by those skilled in the art that these examples are for illustrative purposes only and should not be construed as limiting the present invention, i.e., the present invention is equally applicable to the case of selecting multiple high speed ue for handover.
The resource configuration means 201 of the picocell base station 20, after receiving its handover request for the high speed user equipment 3 from the macrocell 10, configures reserved resources for the high speed user equipment 3 in response to the handover request. Based on the QoS information of the received E-RAB (Enhanced-Radio Access bearer) and the Radio resources of the pico cell 20, the pico cell 20 performs policy selection and Access control. Here, the resource allocation means 201 decides to grant the handover request, but selects the interference cancellation mechanism scheduled in cooperation with the macro cell 10, for example, the resource allocation means 201 allocates reserved resources, such as reserved specific subframes, for the high speed ue 3 requested to handover, so that the macro cell can provide services for the high speed ue 3 on the reserved resources. In the reserved subframe, the pico Cell 20 still needs to transmit at least a Cell-specific Reference Signal (CRS). The resource allocation means 201 transmits a handover resolution message corresponding to its handover request to the macro cell 10, the handover resolution message including indication information of reserved resources allocated for the high speed user equipment 3 requesting handover. For example, the resource configuration device 201 sends a HANDOVER request acknowledgement (NACK) message to the macro cell, wherein the NACK message carries the resource utilization pattern of the reserved resources configured by the pico cell 20 for the high-speed user equipment 3 requesting HANDOVER. Preferably, the handover resolution message may also carry other information, for example, in a case of requesting handover to a high speed ue group, the pico cell 20 may decide to perform handover only to a part of the high speed ues therein, that is, configure reserved resources for other high speed ues in the high speed ue group, so that the handover resolution message may also include an updated high speed ue group (including the high speed ues for which the pico cell 20 configures reserved resources), identification information thereof, and an associated subframe utilization mode.
After the instruction transceiver 101 of the macrocell base station 10 receives the handover reject message sent by the picocell 20 corresponding to the previous handover request, the communication device 102 provides a service to the high-speed user equipment 3 on the reserved resources configured by the picocell 20 according to the instruction information of the reserved resources included therein so as to avoid interference to/from the picocell 20. After instructing the transceiver 101 to receive the NACK message, the communication device 102 configures a restricted measurement report of RRM/RLM (Radio Link monitor)/CSI (Channel state information) to the high-speed ue 3 passing through the pico cell 20 through RRC signaling. The high speed user equipment 3 will be triggered to report the corresponding measurement report to the macro cell 10 according to the configured RRM/RLM/CSI restriction parameter according to the predetermined rule.
Based on the RLM-restricted measurement report reported by the high speed user equipment 3, the notification means 103 of the macrocell base station 10 determines whether the high speed user equipment 3 has moved out of the picocell 20. One exemplary decision condition is shown below:
if the Reference Signal Receiving Power (RSRP) of the pico cell is less than the Reference signal receiving Power-T of the macro cell, i.e., RSRP (pico cell) < RSRP (macro cell) -T, the high speed user equipment 3 is out of the coverage of the pico cell, where T is a predetermined threshold.
When it is determined that the high-speed user equipment 3 moves out of the coverage of the pico cell 20, the notification device 103 sends a notification message about stopping configuring the reserved resources for the high-speed user equipment 3 to the pico cell 20, for example, the notification device 103 sends a "stop coordination Request" message to the pico cell 20, where the notification message carries the identification information of the high-speed user equipment 3.
In the case where there are a plurality of high speed user equipments requesting handover, when all the high speed user equipments are out of the coverage of the pico cell 20, the notification means 103 sends a notification message to the pico cell 20 about stopping configuring the reserved resources for these high speed user equipments.
The notification reception device 203 of the picocell base station 20 receives the notification message transmitted by the macrocell 10, and the configuration control device 204 stops the configuration of the corresponding reserved resource for the coordinated scheduling with the macrocell 10. That is, the configuration control device 204 stops the configuration of the reserved subframes for the high-speed ue 3, and the pico cell 20 returns to normal operation.
The notification reception device 203 also transmits a "stop coordination request acknowledgement (stopcoordination request acknowledgement)" message to the macrocell 10.
Subsequently, the macro cell 10 reconfigures the channel condition measurement report for the high speed ue 3 and resumes normal operation.
In another preferred application scenario of the macrocell base station 10 and the picocell base station 20 shown in fig. 4, the macrocell base station 10 directly requests the picocell base station 20 to configure reserved resources for the high-speed user equipment 3, and the picocell 20 utilizes an ABS (almost blank subframe) to avoid interference between the picocell 20 and the high-speed user equipment 3. Thus, this picocell 20-directed ABS configuration procedure can be used to solve the problem of strong interference generated when high-speed user equipment 3 in a macrocell 10 passes through the coverage area of a picocell 20.
The macro cell 10 configures measurement reports for all ues in its coverage area and adds mobility thresholds to assist the ues in determining their mobility state, i.e. high speed ues or low speed ues. The threshold is determined by the macro cell 10 and may be adjusted to the actual situation.
When the high speed user equipment 3 approaches the pico cell 20, since it receives a stronger RSRP from the pico cell than from the macro cell 10, an a3 event is triggered and the high speed user equipment 3 reports a measurement report to the macro cell 10. In addition to the usual measurement parameters, the high speed ue 3 sends high speed ue indication information to the macro cell 10, for example, by adding a high speed ue indicator to the measurement report, which may occupy one bit and indicate high speed ue with "1" and low speed ue with "0" to inform the macro cell 10 that it should be avoided to handover to the pico cell 20. The estimate of the mobility state of the user equipment may be obtained by counting the number of times a handover of the user equipment occurs within a predetermined time. An exemplary a3 event is shown below:
Mn+Ofn+Ocn-Hys＞Mp+Ofp+Ocp+Off
wherein,
where Mn is the measurement result for the neighbor cell, without considering any offset;
ofn is the frequency specific offset of the neighbouring cell, i.e. the offset frequency parameter (offsetFreq) defined in the measurement configuration of EUTRA (measObjectEUTRA), which corresponds to the frequency of the neighbouring cell;
ocn is the cell specific offset of the neighbouring cell, i.e. the cell specific offset parameter (celllndividualoffset) defined in the measurement configuration of EUTRA (measObjectEUTRA) sets Ocn to 0 if not configured for a neighbouring cell;
mp is the measurement result for the primary serving cell, without considering any offset;
ofp is the frequency specific offset of the primary serving cell, i.e. the offset frequency parameter (offsetFreq) defined in the measurement configuration of EUTRA (measObjectEUTRA), which corresponds to the carrier frequency of the primary serving cell;
ocp is the cell specific offset of the primary serving cell, i.e. the cell specific offset parameter (celllndividualoffset) defined in the measurement configuration of EUTRA (measObjectEUTRA), if not configured for pico cells, Ocp is set to 0;
hys is a hysteresis parameter for the event, i.e. a hysteresis parameter defined for the event in the reporting configuration of EUTRA (reportConfigEUTRA);
off is an offset parameter for the event, i.e. the a3 offset defined for the event in the reporting configuration for EUTRA (reportConfigEUTRA).
Upon receiving a measurement report triggered by the a3 event, the macrocell 10 ranks the mobility state of user equipment according to high speed user equipment indicators therein. At the same time, the macro cell 10 will detect the type of target cell potentially performing handover, i.e. the target cell is a macro cell or a pico cell, which will cause strong interference to the user equipment within the macro cell 10.
According to the mobility state class of the user equipment, the macro cell 10 will perform the following operations:
1) for low speed user equipment, the macro cell 10 will initiate a handover operation;
2) for high speed user equipment, the macrocell 10 will request from the picocell 20 to configure reserved resources for it without handing it over to the picocell 20.
For the high speed ue 3, the instruction transceiver 101 of the macrocell base station 10 sends a configuration request for configuring the reserved resources for the high speed ue 3 to the target picocell, for example, instructs the transceiver 101 to send an "ABS Turn-on request" message to the picocell 20. Preferably, when the macro cell 10 is currently providing a VoIP (Voice over Internet Protocol) service for the high-speed user equipment 3, the ABS on request may further include a next transmission time message of the VoIP service.
The resource allocation means 201 of the picocell base station 20 receives and responds to the configuration request sent by the macrocell 10 to allocate reserved resources, such as ABS, for the high-speed user equipment 3. According to the current ABS status of the pico cell 20, the resource configuration device 201 will perform the following operations:
1) if the pico cell 20 has not configured ABS currently and the high speed ue 3 is using VoIP service, the resource configuration apparatus 201 determines which subframe to use when configuring ABS for the high speed ue 3 according to the next transmission time message of the high speed ue 3 in the ABS activation request and the VoIP data transmission interval;
2) if the pico cell 20 has not configured ABS and the high speed ue 3 does not use VoIP service, the resource configuration apparatus 201 may configure any subframe as a reserved subframe;
3) if the pico cell 20 has currently configured ABS and the ABS turning-on request received by the pico cell is not for the high speed ue using VoIP service, the resource configuration apparatus 201 does not need to additionally configure reserved subframes for the high speed ue;
4) if the pico cell 20 has currently configured ABS and the ABS on request it receives is for a high speed ue using VoIP service, the resource configuration apparatus 201 reconfigures the ABS according to the next transmission time message of the high speed ue 3 in the ABS on request.
The resource indicating means 202 sends indication information on the reserved resources configured for the high speed user equipment 3 to the macro cell 10. For example, after the resource configuring device 201 configures or reconfigures the ABS for the high speed user equipment 3, the resource indicating device 202 sends the indication information of the configured ABS to the macro cell 10 through the existing X2ABS load related message.
After the instruction transceiver 101 of the macrocell base station 10 receives the instruction information of the configured ABS from the picocell 20, the communication device 102 resets the measurement configuration information through RRC signaling and makes a corresponding scheduling decision according to the configured ABS.
Since the ABS is adopted in the pico cell 20 to protect the high speed ue 3 in the macro cell 10, the ABS should be stopped when the high speed ue 3 leaves the pico cell 20 to avoid wasting resources. The notification device 103 of the macrocell base station 10 detects whether or not the high-speed user equipment 3 is still in the coverage area of the picocell 20, and transmits a notification message to the picocell 2 about stopping the configuration of the reserved resources, for example, transmits an "ABS Turn-off request" message to the picocell 20 when the high-speed user equipment leaves the picocell 20. Here, there are at least 2 ways to detect whether the high speed user equipment 3 is out of the coverage of the pico cell 20, so that the pico cell 20 stops configuring its ABS:
1) when the high-speed user equipment 3 detects that the RSRP (Reference signal receiving power) or RSRQ (Reference signal receiving Quality) received by the high-speed user equipment 3 is lower than a corresponding predetermined threshold, the high-speed user equipment 3 sends a specific message to the affiliated macro cell 10 to indicate that the interference from the pico cell 20 is currently small, so as to inform the pico cell 20 to stop ABS configuration;
2) when the macro cell 10 receives another measurement report triggered by an A3 event, where the identification information of the target cell is different from the identification information of the pico cell in the measurement report of the A3 event triggered by the high speed ue 3, the macro cell 10 knows that the high speed ue 3 has left the pico cell 20, and can inform the pico cell 20 to stop ABS configuration.
After the notification reception device 203 of the picocell base station 20 receives the ABS shutdown request transmitted by the macrocell 10, the configuration control device 204 determines whether to stop configuring the ABS according to the other received ABS startup requests.
It should be noted that the present invention may be implemented in software and/or in a combination of software and hardware, for example, using Application Specific Integrated Circuits (ASICs), general purpose computers or any other similar hardware devices.
The software program of the present invention can be executed by a processor to implement the steps or functions described above. Also, the software programs (including associated data structures) of the present invention can be stored in a computer readable recording medium, such as RAM memory, magnetic or optical drive or diskette and the like. Additionally, some of the steps or functionality of the present invention may be implemented in hardware, for example, as circuitry that cooperates with the processor to perform various functions or steps.
In addition, some of the present invention can be applied as a computer program product, such as computer program instructions, which when executed by a computer, can invoke or provide the method and/or technical solution according to the present invention through the operation of the computer. Program instructions which invoke the methods of the present invention may be stored on a fixed or removable recording medium and/or transmitted via a data stream on a broadcast or other signal-bearing medium and/or stored within a working memory of a computer device operating in accordance with the program instructions. Here, according to an embodiment of the present invention, it includes an apparatus, which includes a memory for storing computer program instructions and a processor for executing the program instructions, wherein the computer program instructions, when executed by the processor, trigger the apparatus to execute the method and/or the technical solution according to the foregoing embodiments of the present invention.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned. Furthermore, it is obvious that the word "comprising" does not exclude other elements or steps, and the singular does not exclude the plural. A plurality of units or means recited in the system claims may also be implemented by one unit or means in software or hardware. The terms first, second, etc. are used to denote names, but not any particular order.
Claims (9)
1. A method for a heterogeneous network to cancel interference between a pico cell and a high speed user equipment, wherein the heterogeneous network comprises a macro cell and a pico cell both having geographically co-coverage areas, and the high speed user equipment comprises a user equipment whose speed exceeds a predetermined threshold, wherein the method comprises:
a, when high-speed user equipment corresponding to the macro cell enters the coverage area of the pico cell, the pico cell configures reserved resources for the high-speed user equipment so as to eliminate the interference between the pico cell and the high-speed user equipment;
b the macro cell communicates with the high-speed user equipment on the reserved resources;
wherein, the step a specifically comprises:
-the macro cell sending a handover request for the high speed user equipment to the pico cell;
-in response to said handover request, the pico cell configuring said reserved resources for said high speed user equipment;
-the pico cell sending a handover reject message corresponding to the handover request to the macro cell, the handover reject message comprising the indication information of the reserved resources.
2. The method of claim 1, wherein the step b comprises:
-the macro cell reconfiguring the user equipment in accordance with the reserved resources to communicate with the user equipment on the reserved resources.
3. The method of claim 1 or 2, wherein the method further comprises:
-when the high speed user equipment is out of the coverage of the pico cell, the macro cell sending a notification message to the pico cell about stopping the configuration of the reserved resources;
-the pico cell stopping the configuration of said reserved resources according to said notification message.
4. An apparatus for eliminating interference between a pico cell and a high speed user equipment in a heterogeneous network, wherein the heterogeneous network comprises the pico cell and a macro cell having a same geographical coverage area as the pico cell, and the high speed user equipment comprises the user equipment of which the speed exceeds a predetermined threshold, wherein the apparatus comprises:
resource allocation means, configured to allocate reserved resources for the high-speed user equipment when the high-speed user equipment corresponding to the macro cell enters the coverage of the pico cell, so as to eliminate interference between the pico cell and the high-speed user equipment;
resource indicating means for sending indication information on the reserved resources to the macro cell for the macro cell to communicate with the high speed user equipment on the reserved resources;
wherein the resource configuration device is specifically configured to:
-receiving a handover request for the high speed user equipment from the macro cell;
-configuring the reserved resources for the high speed user equipment in response to the handover request;
wherein the resource indication apparatus is specifically configured to:
-sending a handover reject message corresponding to the handover request to the macro cell, the handover reject message comprising an indication of the reserved resources for communication by the macro cell with the high speed user equipment on the reserved resources.
5. The apparatus of claim 4, wherein the apparatus comprises:
notification receiving means for receiving a notification message from the macro cell regarding stopping the configuration of the reserved resources when the high speed user equipment is out of the coverage of the pico cell;
and the configuration control device is used for stopping the configuration of the reserved resources according to the notification message.
6. An apparatus for assisting a pico cell of a macro cell in a heterogeneous network to cancel interference between the macro cell and a high speed user equipment, wherein the heterogeneous network comprises the macro cell and the pico cell having a geographical same coverage area with the macro cell, and the high speed user equipment comprises the user equipment of which the speed exceeds a predetermined threshold, wherein the apparatus comprises:
an indication transceiver, configured to receive, from the pico cell, indication information of reserved resources configured for the high-speed user equipment when the high-speed user equipment corresponding to the macro cell enters a coverage area of the pico cell;
communication means for communicating with the high speed user equipment on the reserved resources;
wherein the indication transceiver is specifically configured to:
-sending a handover request for the high speed user equipment to the pico cell;
-receiving from the pico cell a handover reject message corresponding to said handover request, said handover reject message comprising information indicating reserved resources configured by the pico cell for said high speed user equipment.
7. The apparatus of claim 6, wherein the communication device is to:
-reconfiguring the user equipment to communicate with the user equipment on the reserved resources in accordance with the reserved resources.
8. The apparatus of claim 6 or 7, wherein the apparatus further comprises:
and a notification device, configured to send a notification message about stopping the configuration of the reserved resources to the pico cell when the high-speed user equipment is out of the coverage of the pico cell.
9. A system for eliminating interference between a pico cell and a high speed user equipment in a heterogeneous network, wherein the heterogeneous network comprises a macro cell and a pico cell, and both have a geographic same coverage area, and the high speed user equipment comprises a user equipment of which the speed exceeds a predetermined threshold, wherein the system comprises the device for eliminating interference between the pico cell and the high speed user equipment in the heterogeneous network as claimed in any one of claims 4 to 5, and the device for eliminating interference between the high speed user equipment and the auxiliary pico cell for the macro cell in the heterogeneous network as claimed in any one of claims 6 to 8.
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| WO2012060655A2 (en) * | 2010-11-05 | 2012-05-10 | 엘지전자 주식회사 | Method for performing handover in wireless communication system |
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