CN106465350B - Method and apparatus for assisting a UE in reducing interference - Google Patents
Method and apparatus for assisting a UE in reducing interference Download PDFInfo
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Abstract
The present invention aims to help a UE reduce interference from neighboring base stations by providing the UE with Subset Restriction (SR) -related information of one or more levels including multi-level signaling. According to the present invention, there is provided in a base station in a wireless network an apparatus for assisting a UE served by another base station in reducing interference, the apparatus comprising: means for receiving a request for subset restriction from a serving base station; means for providing the subset restriction related information to the serving base station in response to the request, wherein the SR related information may comprise one or more levels of multi-level signaling, wherein a first level indicates whether or not to activate SR and a next level indicates details of SR if SR is to be activated. The following advantages are achieved by the invention: 1) the subset restriction related information provided by the interfering base station helps the UE to reduce false detections and improve its throughput performance; 2) the hierarchical structure of multi-level signaling provides greater flexibility for the base station to indicate various combinations of subset restrictions. This is to allow the base station to decide whether to start or stop the subset restriction; 3) the hierarchical structure of the multi-level signaling provides flexibility to accommodate future extensions.
Description
Technical Field
The present invention relates to the field of wireless networks, and more particularly to techniques for assisting a UE in reducing interference in a wireless network.
Background
In various wireless networks, such as 3 GPP-based wireless networks, User Equipment (UE) in one cell served by a base station located close to the perimeter covered by a neighboring base station will experience interference from the neighboring base station. The interference will lead to false detections in the UE and may affect its throughput performance.
Currently, Network Assisted Interference Cancellation and Suppression (NAICS) is proposed in the Work Item (WI) release 12 of 3GPP, which provides information about the source of interference so that the UE can use this information to cancel or suppress the interference, thereby reducing false detections and improving throughput performance. However, the details of NAICS are not disclosed in WI 12 th edition.
Disclosure of Invention
The present invention aims to help a UE reduce interference from neighboring base stations by providing the UE with Subset Restriction (SR) -related information of one or more levels including multi-level signaling.
According to one embodiment, there is provided in a base station in a wireless network, an apparatus for assisting a UE served by another base station in reducing interference, the apparatus comprising:
means for receiving a request for a Subset Restriction (SR) from a serving base station;
means for providing the subset restriction related information to the serving base station in response to the request, wherein the SR related information may comprise one or more levels of multi-level signaling, wherein a first level indicates whether or not to activate SR and a next level indicates details of SR if SR is to be activated.
According to a second embodiment, there is provided in a base station in a wireless network, an apparatus for assisting a UE served by the base station itself in reducing interference, the apparatus comprising:
means for transmitting a request for Subset Restriction (SR) to an interfering base station;
means for receiving subset restriction related information sent by the interfering base station in response to the request, wherein the subset restriction related information may comprise one or more levels of multi-level signaling, wherein a first level indicates whether SR is to be activated and a next level indicates details of SR if SR is to be activated;
means for forwarding the received subset restriction related information to the UE requiring NAICS.
According to a third embodiment, there is provided in a base station in a wireless network, a method for assisting a UE served by another base station in reducing interference, the method comprising:
-receiving a request for Subset Restriction (SR) from a serving base station;
-providing subset restriction related information to the serving base station in response to the request, wherein the subset restriction related information may comprise one or more levels of multi-level signaling, wherein a first level indicates whether SR is to be activated and a next level indicates details of SR if SR is to be activated.
According to a fourth embodiment, there is provided in a base station in a wireless network, a method for assisting a UE served by the base station itself in reducing interference, the method comprising:
-sending a request for Subset Restriction (SR) to an interfering base station;
-receiving subset restriction related information sent by the interfering base station in response to the request, wherein the subset restriction related information may comprise one or more levels of multi-level signaling, wherein a first level indicates whether SR is to be activated and a next level indicates details of SR if SR is to be activated;
-forwarding the received subset restriction related information to the UE requiring NAICS.
The following advantages are achieved by the invention:
the subset restriction related information provided by the interfering base station helps the UE to reduce false detections and improve its throughput performance;
the hierarchical structure of multi-level signaling provides the base station with more flexibility to indicate various combinations of subset restrictions. This is to allow the base station to decide whether to start or stop the subset restriction;
the hierarchical structure of multi-level signaling provides flexibility to accommodate future extensions.
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 accompanying drawings.
FIG. 1 illustrates an exemplary scenario of a wireless network;
fig. 2 shows a flow diagram of a method for assisting a user equipment in reducing interference according to one embodiment of the invention;
fig. 3 shows a flow diagram of a method for assisting a user equipment in reducing interference according to another embodiment of the invention;
fig. 4 shows a schematic diagram of a system for assisting a user equipment in reducing interference according to an embodiment of the invention;
fig. 5 shows a schematic diagram of a system for assisting a user equipment in reducing interference according to an embodiment of the invention.
The same or similar reference numerals in the drawings denote the same or similar components.
Detailed Description
Further description of the present invention will be given below with reference to the accompanying drawings.
Definition of technical terms:
for clarity, we first define some terms in context as follows:
"wireless network" means a communication network for voice and/or data transmission by wireless signals, comprising a plurality of base stations, each serving one or more cells in which one or more user equipments are present. Wireless networks include, without limitation, wireless networks based on GSM, CDMA, 3GPP (third generation partnership project) protocols.
"base station" means a radio station (radio station) with a bi-directional transceiver, which can communicate by radio signals both uplink and downlink with UEs in the cell it serves, and also directly or indirectly with other base stations. Wireless networks include, without limitation, base stations in wireless networks based on GSM protocols, Node bs (Node bs) in wireless networks based on CDMA protocols, and e-Node bs in wireless networks based on 3GPP protocols.
"user equipment" means a communication device used by a user, which can communicate uplink and downlink with a base station in a wireless network. User equipment includes, without limitation, a mobile phone, a laptop computer, or a tablet computer having a telecommunications module for a wireless network.
For clarity, only two base stations BS1, BS2 are shown and for greater clarity only one user equipment UE3 is shown in a cell served by base station BS2 (which is referred to as the "serving base station") located near the perimeter covered by BS1 and subject to interference from BS1 (which is referred to as the "interfering base station") when communicating in the downlink with BS 2. wherein the wireless network may be a 3 GPP-based wireless network, which is preferably a L TE network, and the base stations are e-Node Bs of an L TE network.
Fig. 2 shows a flow diagram of a method for assisting a user equipment in reducing interference according to one embodiment of the invention. This will be described in detail below with reference to fig. 1 and fig. 2:
as shown in fig. 1, the UE3 in the cell of BS2 is located near the perimeter of the cell of BS1 and is therefore subject to interference from BS1 during downlink and uplink communications with BS 2.
To help the UE3 cancel and suppress downlink interference from the BS1, at step S201, the BS2 sends a request to the BS1 to request the BS1 to start a Subset Restriction (SR) operation, that is, the base station restricts certain parameters related to downlink communications to a subset in order to avoid interfering with other neighboring base stations.
The request may include only an indication of the presence of a UE requiring Network Assisted Interference Cancellation and Suppression (NAICS), or explicit information requesting the BS1 to activate SR operation. It will be appreciated by those skilled in the art that the request may include other types of information for requesting the BS1 to activate the SR operation.
After receiving the request for SR from the BS2, the BS1 transmits SR-related information to the BS2 as a response at step S202. It will be understood by those skilled in the art that the SR-related information may be contained in a specific field of the message specified by the specification of the existing interface between the two base stations, such as the X2 interface, or may be carried by new signaling over the existing or new interface between the two base stations. It should be understood that other ways for carrying SR related information, if applicable to the present invention, shall also fall within the scope of protection of the present invention and are incorporated herein by reference.
The SR-related information may include multi-level signaling, where a first level indicates whether to activate the SR; and the next level indicates the details of the SR, if it is to be activated. For example, in the case of two-level signaling, the first level of signaling is a base station specific N-bit SR binary sequence. Each bit of the sequence corresponds to a different parameter for which an SR operation can be performed. When one bit is "1", it indicates that the SR operation is to be activated for its corresponding parameter; otherwise, when the bit is "0", it means that the SR operation will not be activated for its corresponding parameter. And a second level of signaling includes one or more Information Elements (IEs) corresponding to some or all of the "1" bits in the sequence. Each IE corresponds to a different "1" bit of the N-bit SR binary sequence and defines specific information of the SR operation for the parameter to which the "1" bit corresponds.
In one example, the SR-related information includes a base station specific N-bit SR binary sequence. Each bit of the sequence corresponds to a different parameter for which an SR operation can be performed. When one bit is "1", it indicates that the SR operation is to be activated for its corresponding parameter; otherwise, when the bit is "0", it means that the SR operation will not be activated for its corresponding parameter.
In another example, in addition to an N-bit SR binary sequence, SR-related information includes some Information Elements (IEs) corresponding to some or all "1" bits in the sequence. Each IE corresponds to a different "1" bit of the N-bit SR binary sequence and defines specific information of the SR operation for the parameter to which the "1" bit corresponds. For example:
for a Transmission Mode (TM) bit being "1", its corresponding IE defines the range or specific subset of the transmission mode that is restricted.
For Physical Resource Block (PRB) bits that are "1", their respective IEs define the number or specific subset of PRBs that are restricted.
For Codebook (CB) bits that are "1", their corresponding IE defines the number or specific subset of codes in the restricted codebook.
In an alternative example, the N-bit SR sequence is static or semi-static, that is, it does not need to be updated frequently. Specifically, the interfering base station may inform other base stations of its N-bit SR sequence through global broadcasting or transmit its N-bit SR sequence to other base stations only once in response to the request of other base stations. Upon receiving the N-bit SR sequence from the interfering base station, the other base stations keep it in the storage device and do not update it until the next time a new N-bit SR sequence is received from the same interfering base station. In this case, since BS2 maintains the N-bit SR sequence previously transmitted by BS1, BS2 need only transmit to BS1 IEs corresponding to some or all of the "1" bits of the N-bit SR sequence, with each IE defining details of the subset restriction of its corresponding parameters. In this way, frequent sending of an N-bit SR sequence each time is avoided, thereby greatly reducing signaling overhead in the transmission of SR-related information.
Upon receiving the SR-related information from the BS1, the BS2 forwards the SR-related information to the UE 3. The UE3 will use this SR-related information in the detection process and benefit from detection performance and complexity.
Fig. 3 shows a flow diagram of a method for assisting a user equipment in reducing interference according to another embodiment of the invention. We will now describe this in detail in connection with fig. 1 and with reference to fig. 3:
as shown in fig. 1, the UE3 in the cell of BS2 is located near the perimeter of the cell of BS1 and is therefore subject to interference from BS1 during downlink and uplink communications with BS 2.
To help the UE3 cancel and suppress downlink interference from the BS1, at step S301, the BS2 sends a request to the BS1 to request the BS1 to activate a Subset Restriction (SR) operation, i.e., the base station restricts certain parameters related to downlink communications to a subset in order to avoid interfering with other neighboring base stations.
The request may include only an indication of the presence of a UE requiring Network Assisted Interference Cancellation and Suppression (NAICS), or explicit information requesting the BS1 to activate SR operation. It will be appreciated by those skilled in the art that the request may include other types of information for requesting the BS1 to activate SR operation, which should fall within the scope of the present invention and is incorporated herein by reference.
After receiving the request for the SR from the BS2, the BS1 determines whether to activate the SR based on the request at step S302. For example, upon receiving the request, the BS1 estimates the impact on its system performance caused by the SR to be activated. Its system performance includes, without limitation, any combination of its scheduler's performance or flexibility, the number of UEs it serves or its throughput capacity, and so on. If the impact does not exceed a predefined condition, it decides to activate the SR; otherwise, it decides not to activate SR. It will be appreciated by those skilled in the art that other ways of deciding whether to activate SR operation, if applicable, are within the scope of the present invention and are incorporated herein by reference.
In this way, the interfering base station (i.e., BS1) may be provided with more flexibility in deciding whether to initiate SR, thereby achieving a balance between stability of system performance and providing network-assisted interference cancellation and suppression for the UE.
At step S303, if it is decided that the SR is to be activated, the BS1 transmits SR-related information to the BS2 in response. It will be understood by those skilled in the art that the SR-related information may be contained in a specific field of the message specified by the specification of the existing interface between the two base stations, such as the X2 interface, or may be carried by new signaling over the existing or new interface between the two base stations. It should be understood that other ways for carrying SR related information, if applicable to the present invention, shall also fall within the scope of protection of the present invention and are incorporated herein by reference.
The SR-related information may include multi-level signaling, where a first level indicates whether to activate the SR; and the next level indicates the details of the SR, if it is to be activated. For example, in the case of two-level signaling, the first level of signaling is a base station specific N-bit SR binary sequence. Each bit of the sequence corresponds to a different parameter for which an SR operation can be performed. When one bit is "1", it indicates that the SR operation is to be activated for its corresponding parameter; otherwise, when the bit is "0", it means that the SR operation will not be activated for its corresponding parameter. And a second level of signaling includes one or more Information Elements (IEs) corresponding to some or all of the "1" bits in the sequence. Each IE corresponds to a different "1" bit of the N-bit SR binary sequence and defines specific information of the SR operation for the parameter to which the "1" bit corresponds.
In one example, the SR-related information includes only a base station specific N-bit SR binary sequence. Each bit of the sequence corresponds to a different parameter for which an SR operation can be performed. When one bit is "1", it indicates that the SR operation is to be activated for its corresponding parameter; otherwise, when the bit is "0", it means that the SR operation will not be activated for its corresponding parameter.
In another embodiment, the SR-related information includes some Information Elements (IEs) corresponding to some or all of the "1" bits in the sequence in addition to the N-bit SR binary sequence. Each IE corresponds to a different "1" bit of the N-bit SR binary sequence and defines specific information of the SR operation for the parameter to which the "1" bit corresponds. For example:
for a Transmission Mode (TM) bit being "1", its corresponding IE defines the range or specific subset of the transmission mode that is restricted.
For Physical Resource Block (PRB) bits that are "1", their respective IEs define the number or specific subset of PRBs that are restricted.
For Codebook (CB) bits that are "1", their corresponding IE defines the number or specific subset of codes in the restricted codebook.
In one example, the N-bit SR sequence is static or semi-static, that is, it does not need to be updated frequently. Specifically, the interfering base station may inform other base stations of its N-bit SR sequence through global broadcasting or transmit its N-bit SR sequence to other base stations only once in response to the request of other base stations. Upon receiving the N-bit SR sequence from the interfering base station, the other base stations keep it in the storage device and do not update it until the next time a new N-bit SR sequence is received from the same interfering base station. In this case, since BS2 maintains the N-bit SR sequence previously transmitted by BS1, BS2 need only transmit to BS1 IEs corresponding to some or all of the "1" bits of the N-bit SR sequence, with each IE defining details of the subset restriction of its corresponding parameters. In this way, frequent sending of an N-bit SR sequence each time is avoided, thereby greatly reducing signaling overhead in the transmission of SR-related information.
At step S305 (not shown), if it is decided not to activate SR, the BS1 may send a response to the BS2, such as a Negative Acknowledgement (NAK) or an N-bit SR sequence of all "0" bits, to indicate that SR is not activated. Alternatively, BS1 may also simply not send a response to BS2 to indicate that no SR is activated. It should be understood that other ways of indicating that an SR is not activated should also be incorporated herein by reference and fall within the scope of the present invention, if applicable to the present invention.
Upon receiving the SR-related information from the BS1, the BS2 forwards the SR-related information to the UE3 at step S304. The UE3 will use this SR-related information in the detection process and benefit from detection performance and complexity.
Fig. 4 shows a schematic diagram of a system for assisting a user equipment in reducing interference according to an embodiment of the invention. This will be described in detail below with reference to fig. 1 and with reference to fig. 4:
as shown in fig. 1, the UE3 in the cell of BS2 is located near the perimeter of the cell of BS1 and is therefore subject to interference from BS1 during downlink and uplink communications with BS 2.
To help the UE3 cancel and suppress downlink interference from the BS1, in BS2, an apparatus 21 called a "transmitting device" sends a request to BS1 to request BS1 to start a Subset Restriction (SR) operation, that is, a base station restricts certain parameters related to downlink communications to a subset in order to avoid interfering with other neighboring base stations.
The request may include only an indication of the presence of a UE requiring Network Assisted Interference Cancellation and Suppression (NAICS), or explicit information requesting the BS1 to activate SR operation. It will be appreciated by those skilled in the art that the request may include other types of information for requesting the BS1 to activate the SR operation.
After receiving the request for SR from the BS2, in the BS1, the apparatus 11 called "providing device" transmits SR-related information to the BS2 in response. It will be understood by those skilled in the art that the SR-related information may be contained in a specific field of the message specified by the specification of the existing interface between the two base stations, such as the X2 interface, or may be carried by new signaling over the existing or new interface between the two base stations. It should be understood that other ways for carrying SR related information, if applicable to the present invention, shall also fall within the scope of protection of the present invention and are incorporated herein by reference.
The SR-related information may include multi-level signaling, where a first level indicates whether to activate the SR; and the next level indicates the details of the SR, if it is to be activated. For example, in the case of two-level signaling, the first level of signaling is a base station specific N-bit SR binary sequence. Each bit of the sequence corresponds to a different parameter for which an SR operation can be performed. When one bit is "1", it indicates that the SR operation is to be activated for its corresponding parameter; otherwise, when the bit is "0", it means that the SR operation will not be activated for its corresponding parameter. And a second level of signaling includes one or more Information Elements (IEs) corresponding to some or all of the "1" bits in the sequence. Each IE corresponds to a different "1" bit of the N-bit SR binary sequence and defines specific information of the SR operation for the parameter to which the "1" bit corresponds.
In one example, the SR-related information includes a base station specific N-bit SR binary sequence. Each bit of the sequence corresponds to a different parameter for which an SR operation can be performed. When one bit is "1", it indicates that the SR operation is to be activated for its corresponding parameter; otherwise, when the bit is "0", it means that the SR operation will not be activated for its corresponding parameter.
In another example, in addition to an N-bit SR binary sequence, SR-related information includes some Information Elements (IEs) corresponding to some or all "1" bits in the sequence. Each IE corresponds to a different "1" bit of the N-bit SR binary sequence and defines specific information of the SR operation for the parameter to which the "1" bit corresponds. For example:
for a Transmission Mode (TM) bit being "1", its corresponding IE defines the range or specific subset of the transmission mode that is restricted.
For Physical Resource Block (PRB) bits that are "1", their respective IEs define the number or specific subset of PRBs that are restricted.
For Codebook (CB) bits that are "1", their corresponding IE defines the number or specific subset of codes in the restricted codebook.
In an alternative example, the N-bit SR sequence is static or semi-static, that is, it does not need to be updated frequently. Specifically, the interfering base station may inform other base stations of its N-bit SR sequence through global broadcasting or transmit its N-bit SR sequence to other base stations only once in response to the request of other base stations. Upon receiving the N-bit SR sequence from the interfering base station, the other base stations keep it in the storage device and do not update it until the next time a new N-bit SR sequence is received from the same interfering base station. In this case, since BS2 maintains the N-bit SR sequence previously transmitted by BS1, BS2 need only transmit to BS1 IEs corresponding to some or all of the "1" bits of the N-bit SR sequence, with each IE defining details of the subset restriction of its corresponding parameters. In this way, frequent sending of an N-bit SR sequence each time is avoided, thereby greatly reducing signaling overhead in the transmission of SR-related information.
Upon receiving the SR-related information from the BS1, an apparatus (25) of the BS2, referred to as a "forwarding device," forwards the SR-related information to the UE 3. The UE3 will use this SR-related information in the detection process and benefit from detection performance and complexity.
It will be appreciated by those skilled in the art that the aforementioned devices and modules in each base station BS1, BS2 may be independent of each other. Alternatively, some or all of them may be integrated together in one device, such as a scheduler.
Fig. 5 shows a schematic diagram of a system for assisting a user equipment in reducing interference according to another embodiment of the invention.
As shown in fig. 1, the UE3 in the cell of BS2 is located near the perimeter of the cell of BS1 and is therefore subject to interference from BS1 during downlink and uplink communications with BS 2. This will be described in detail below with reference to fig. 5 in conjunction with fig. 1:
to help the UE3 cancel and suppress downlink interference from the BS1, in BS2, an apparatus 21 called a "transmitting device" sends a request to BS1 to request BS1 to activate a Subset Restriction (SR) operation, that is, a base station restricts certain parameters related to downlink communications to a subset in order to avoid interfering with other neighboring base stations.
The request may include only an indication of the presence of a UE requiring Network Assisted Interference Cancellation and Suppression (NAICS), or explicit information requesting the BS1 to activate SR operation. It will be appreciated by those skilled in the art that the request may include other types of information for requesting the BS1 to activate SR operation, which should fall within the scope of the present invention and is incorporated herein by reference.
After receiving the request for SR from BS2, in an apparatus 12 of BS1 called "providing device", the decision module 121 absolutely whether or not to activate SR based on the request. For example, upon receiving a request, the decision module 121 estimates the impact on system performance caused by the SR to be activated. System performance includes, without limitation, any combination of the performance or flexibility of its scheduler, the number of UEs it serves or its throughput capacity, and so on. The decision module 121 decides to activate SR if the impact does not exceed a predefined condition; otherwise, it decides not to activate SR. It will be appreciated by those skilled in the art that other ways of deciding whether to activate SR operation, if applicable, are within the scope of the present invention and are incorporated herein by reference.
In this way, the interfering base station (i.e., BS1) may be provided with more flexibility in deciding whether to initiate SR, thereby achieving a balance between stability of system performance and providing network-assisted interference cancellation and suppression for the UE.
If the decision module 121 decides to activate SR, the transmission module 122 in the providing apparatus 12 transmits SR-related information to the BS2 in response. It will be understood by those skilled in the art that the SR-related information may be contained in a specific field of the message specified by the specification of the existing interface between the two base stations, such as the X2 interface, or may be carried by new signaling over the existing or new interface between the two base stations. It should be understood that other ways for carrying SR related information, if applicable to the present invention, shall also fall within the scope of protection of the present invention and are incorporated herein by reference.
In one example, the SR-related information includes a base station specific N-bit SR binary sequence. Each bit of the sequence corresponds to a different parameter for which an SR operation can be performed. When one bit is "1", it indicates that the SR operation is to be activated for its corresponding parameter; otherwise, when the bit is "0", it means that the SR operation will not be activated for its corresponding parameter.
In another example, in addition to an N-bit SR binary sequence, SR-related information includes some Information Elements (IEs) corresponding to some or all "1" bits in the sequence. Each IE corresponds to a different "1" bit of the N-bit SR binary sequence and defines specific information of the SR operation for the parameter to which the "1" bit corresponds. For example:
for a Transmission Mode (TM) bit being "1", its corresponding IE defines the range or specific subset of the transmission mode that is restricted.
For Physical Resource Block (PRB) bits that are "1", their respective IEs define the number or specific subset of PRBs that are restricted.
For Codebook (CB) bits that are "1", their corresponding IE defines the number or specific subset of codes in the restricted codebook.
In an alternative example, the N-bit SR sequence is static or semi-static, that is, it does not need to be updated frequently. Specifically, the interfering base station may inform other base stations of its N-bit SR sequence through global broadcasting or transmit its N-bit SR sequence to other base stations only once in response to the request of other base stations. Upon receiving the N-bit SR sequence from the interfering base station, the other base stations keep it in the storage device and do not update it until the next time a new N-bit SR sequence is received from the same interfering base station. In this case, since BS2 maintains the N-bit SR sequence previously transmitted by BS1, BS2 need only transmit to BS1 IEs corresponding to some or all of the "1" bits of the N-bit SR sequence, with each IE defining details of the subset restriction of its corresponding parameters. In this way, frequent sending of an N-bit SR sequence each time is avoided, thereby greatly reducing signaling overhead in the transmission of SR-related information.
If the decision block 121 decides not to activate SR, the BS1 may send a response to the BS2, such as a Negative Acknowledgement (NAK) or an N-bit SR sequence of all "0" bits to indicate that no SR is activated. Alternatively, BS1 may also simply not send a response to BS2 to indicate that no SR is activated. It should be understood that other ways of indicating that an SR is not activated should also be incorporated herein by reference and fall within the scope of the present invention, if applicable to the present invention.
After receiving the SR-related information from the BS1, the apparatus 25 of the BS2 (not shown), referred to as a "forwarding device," forwards the SR-related information to the UE 3. The UE3 will use this SR-related information in the detection process and benefit from detection performance and complexity.
It will be appreciated by those skilled in the art that the aforementioned devices and modules in each base station BS1, BS2 may be independent of each other. Alternatively, some or all of them may be integrated together in one device, such as a scheduler.
It should be noted that the present invention may be implemented by software and/or a combination of software and hardware, for example, the present invention may be implemented by using Application Specific Integrated Circuits (ASIC), a general purpose computer or any other similar hardware equipment. In one embodiment, the software program of the present invention may be executed by a processor to implement the aforementioned steps or functions. Likewise, the software programs (including associated data structures) of the present invention can be stored in a computer-readable recording medium, such as a RAM memory, a magneto-optical drive or diskette, and the like. Further, some of the steps or functions of the present invention may be implemented by using hardware such as a circuit which implements the respective steps or functions in cooperation with a processor.
Furthermore, parts of the present invention may be applied as a computer program product, such as computer program instructions, which, when executed by a computer, may invoke or provide the method and/or technical solution according to the present invention through the operation of the computer. Program instructions for invoking the inventive methods may be stored in a fixed or removable recording medium and/or transmitted via a broadcast or other signal bearing medium and/or stored in an operating memory of a computer device executing according to the program instructions. An embodiment according to the invention herein comprises an apparatus comprising a memory for storing computer program instructions and a processor for executing the program instructions, which apparatus is triggered to operate the method and/or technical solution according to the aforementioned embodiment of the invention when the computer program instructions are executed by the processor.
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, that the singular does not exclude the plural, that a plurality of elements or means recited in a device claim may be implemented by one element or means or by software or hardware, and that the words "first" and "second" and the like are used merely for denoting the name and not in any particular order.
Claims (13)
1. An apparatus in a base station in a wireless network for assisting a UE served by another base station in reducing interference, the apparatus comprising:
means for receiving a request for Subset Restriction (SR) from a serving base station, wherein the request for subset restriction is for requesting the base station to restrict certain parameters related to downlink communication to a subset;
means for providing subset restriction related information to the serving base station in response to a request, wherein the subset restriction related information comprises a first level of signaling as an N-bit binary sequence, wherein each bit is assigned to indicate a subset restriction on each different parameter, respectively, the subset restriction related information further comprises a second level of signaling consisting of IEs, wherein each IE corresponds to a different bit of the N-bit binary sequence and defines details of the subset restriction represented by that bit, respectively;
means for obtaining, from the serving base station, some or all IEs of the N-bit binary sequence for activating SR operation when the N-bit binary sequence is updated.
2. The apparatus of claim 1, wherein the means for providing comprises:
a decision module for deciding whether to provide subset restriction related information to the serving base station based on the request; and
a sending module for sending the subset restriction related information to the serving base station when deciding to provide the subset restriction related information.
3. The apparatus according to claim 1 or 2, wherein the request comprises indication information about the presence of UEs requiring NAICS.
4. An apparatus in a base station in a wireless network for assisting a UE served by another base station in reducing interference, the apparatus comprising:
means for sending a request for Subset Restriction (SR) to an interfering base station, wherein the request for subset restriction is for requesting the base station to restrict certain parameters related to downlink communication to a subset;
means for receiving and storing subset restriction related information sent by the interfering base station in response to a request, wherein the subset restriction related information comprises a first level of signaling as an N-bit binary sequence, wherein each bit is assigned to indicate a subset restriction on each different parameter, respectively, the subset restriction related information further comprises a second level of signaling consisting of IEs, wherein each IE corresponds to a different bit of the N-bit binary sequence, respectively, and defines details of the subset restriction represented by that bit;
means for forwarding the received subset restriction related information to a UE requiring NAICS;
means for transmitting only a portion or all of IEs corresponding to the N-bit binary sequence for activating SR operation to the interfering base station upon the N-bit binary sequence update.
5. The apparatus of claim 4, wherein the request includes indication information about the presence of a UE that requires NAICS.
6. A method in a base station in a wireless network for assisting a UE served by the base station itself in reducing interference, comprising:
-receiving a request for Subset Restriction (SR) from a serving base station, wherein the request for subset restriction is for requesting the base station to restrict certain parameters related to downlink communication to a subset;
-providing Subset Restriction (SR) related information to the serving base station in response to a request, wherein the subset restriction related information comprises a first level of signaling as an N-bit binary sequence, wherein each bit is assigned to indicate a subset restriction on each different parameter, respectively, the subset restriction related information further comprises a second level of signaling consisting of a number of IEs, wherein each IE corresponds to a different bit of the N-bit binary sequence, respectively, and defines details of the subset restriction represented by that bit;
when the N-bit binary sequence is updated, acquiring part or all of IEs of the N-bit binary sequence for activating SR operation from the serving base station.
7. The method of claim 6, wherein the providing step comprises:
-deciding on the basis of the request whether subset restriction related information is to be provided; and
-upon deciding to provide subset restriction related information, transmitting subset restriction related information to the serving base station.
8. The method according to claim 6 or 7, wherein the request comprises indication information about the presence of UEs requiring NAICS.
9. A method in a base station in a wireless network for assisting a UE served by the base station itself in reducing interference, comprising:
-sending a request for Subset Restriction (SR) to an interfering base station, wherein the request for subset restriction is for requesting the base station to restrict certain parameters related to downlink communication to a subset;
-receiving and storing subset restriction related information sent by the interfering base station in response to a request, wherein the SR related information comprises a first level of signaling as an N-bit binary sequence, wherein each bit is assigned to indicate a subset restriction on each different parameter, respectively, the subset restriction related information further comprises a second level of signaling consisting of IEs, wherein each IE corresponds to a different bit of the N-bit binary sequence, respectively, and defines details of the subset restriction represented by that bit;
-forwarding the received subset restriction related information to UEs requiring NAICS;
-upon update of the N-bit binary sequence, only transmitting to the interfering base station a part or all of the IEs corresponding to the N-bit binary sequence for activating SR operation.
10. The method of claim 9, wherein the request includes indication information about the presence of UEs requiring NAICS.
11. A base station for assisting a UE in reducing interference, the base station comprising the apparatus of any of claims 1 to 5.
12. Wireless network system for assisting a UE in reducing interference, comprising at least one base station of any of claims 1-3 and at least one base station of any of claims 4-5, wherein the wireless network is a 3 GPP-based wireless network.
13. A computer-readable medium having instructions stored thereon that, in response to execution by a computing device, cause the computing device to implement a method as defined in any one of claims 6 to 10.
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| PCT/CN2014/077056 WO2015168907A1 (en) | 2014-05-08 | 2014-05-08 | Method and apparatus for assisting ue to reduce interference |
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| CN101394649A (en) * | 2007-09-21 | 2009-03-25 | 夏普株式会社 | Method and base station for lowering interference between cells in uplink cell communication system |
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| JP3927027B2 (en) * | 2001-12-21 | 2007-06-06 | 株式会社エヌ・ティ・ティ・ドコモ | Resource control system, resource control method, and base station suitable for use in the same |
| CN101860886B (en) * | 2005-02-18 | 2013-05-08 | 富士通株式会社 | Wireless communication system, interference control method and base station thereof |
| US8811198B2 (en) * | 2007-10-24 | 2014-08-19 | Qualcomm Incorporated | Pilot report based on interference indications in wireless communication systems |
| US9031032B2 (en) * | 2009-10-05 | 2015-05-12 | Futurewei Technologies, Inc. | System and method for inter-cell interference coordination |
| CN102123525A (en) * | 2010-01-07 | 2011-07-13 | 夏普株式会社 | Interference coordination method of downlink multi-antenna multiple base stations and base station |
| CN102075977B (en) * | 2011-01-20 | 2013-07-31 | 上海大唐移动通信设备有限公司 | Method and equipment for controlling interference |
| JP5118219B2 (en) * | 2011-02-07 | 2013-01-16 | 京セラ株式会社 | Wireless device |
| GB2490750B (en) * | 2011-05-02 | 2014-07-23 | Broadcom Corp | Method and apparatus for configuring resource elements |
| CN103108330A (en) * | 2011-11-11 | 2013-05-15 | 中兴通讯股份有限公司 | Disturbance coordinating method between cells and device |
| US9538387B2 (en) * | 2012-09-28 | 2017-01-03 | Telefonaktiebolaget Lm Ericsson (Publ) | Radio resource assignment coordination in superdense networks |
| CN103220677B (en) * | 2013-05-09 | 2016-02-10 | 东莞宇龙通信科技有限公司 | For interference elimination method and the base station of cell cluster |
| CN103733666A (en) * | 2013-08-21 | 2014-04-16 | 华为技术有限公司 | Method and device for interering coordination |
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