Patent Application
20240195664
The present application relates to the field of communication, and in particular to interference mitigation (IM) methods and apparatuses, an electronic device, and a storage medium.
In a long term evolution (LTE) and new radio (NR) coexistence network with dynamic spectrum sharing (DSS) or in an LTE and NR coexistence network with spectrum overlap, in case that a neighboring cell for the NR system is in the LTE system, since the cell-specific reference signal (CRS) in the LTE system is a reference signal at a cell level, the CRS always exists and is configured within bandwidth whether a physical downlink shared channel (PDSCH) is scheduled or not scheduled in the neighboring cell. In case that spectra of the NR serving cell and the LTE neighboring cell overlap, it causes a decrease in the PDSCH performance for an NR user equipment (UE) in the serving cell.
At present, as shown in
However, there is no solution to an IM caused by LTE CRS from the neighboring cell to the NR UE in the serving cell.
Embodiments of the present application provides interference mitigation (IM) methods and apparatuses, an electronic device, and a storage medium, to solve related issues of IM caused by the LTE CRS from the neighboring cell to the NR UE in the serving cell.
Embodiments of the present application provide the following solutions.
An embodiment of the present application provides an interference mitigation (IM) method, including:
In an embodiment, the determining whether the interference caused by the LTE CRS from the neighboring cell exists includes:
In an embodiment, the LTE CRS-IM signaling includes:
In an embodiment, the performing LTE CRS-IM includes:
In an embodiment, the obtaining parameters required for performing LTE CRS-IM includes:
In an embodiment, the parameters required for performing LTE CRS-IM include one or more of the followings:
In an embodiment, after the performing LTE CRS-IM, the method further includes:
In an embodiment, the IM method further includes:
In an embodiment, the IM method further includes:
In an embodiment, the IM method further includes:
An embodiment of the present application further provides an interference mitigation (IM) method applied to a base station, including:
In an embodiment, the determining whether the interference caused by the LTE CRS from the neighboring cell to the NR UE exists, includes:
An embodiment of the present application further provides an interference mitigation (IM) apparatus applied to a new radio (NR) user equipment (UE), including:
In an embodiment, the determining device is specifically used for:
In an embodiment, the LTE CRS-IM signaling includes:
In an embodiment, the mitigating device, when performing LTE CRS-IM, is specifically used for:
In an embodiment, the mitigating device, when obtaining the parameters required for performing LTE CRS-IM, is specifically used for:
An embodiment of the present application further provides an interference mitigation (IM) apparatus applied to a base station, including:
In an embodiment, the notification device, when determining whether the interference caused by the LTE CRS from the neighboring cell to the NR UE exists, is specifically used for:
An embodiment of the present application further provides an electronic device, including a memory storing computer programs, and a processor, where the computer programs, when executed by the processor, cause the electronic device to perform any one of the interference mitigation (IM) methods according to the embodiments of the present application.
An embodiment of the present application further provides a processor readable storage medium, and the processor readable storage medium stores a computer program, and the computer program, when executed by a processor, causes the processor to perform any one of the interference (IM) methods according to the embodiments of the present application.
Embodiments of the present application provide IM methods and apparatuses, an electronic device, and a storage medium, applied to the NR UE or the base station. The method applied to the NR UE includes: determining whether the interference caused by the LTE CRS from the neighboring cell exists; and in case that the interference caused by the LTE CRS from the neighboring cell exists, determining whether the NR UE is able to perform LTE CRS-IM based on whether the NR UE has the capability for LTE CRS-IM, and in case that the NR UE has the capability for LTE CRS-IM, performing the LTE CRS-IM. The embodiments of the present application may effectively solve the related issues of LTE CRS-IM, and also avoid excessive resource consumption caused by unnecessary LTE CRS-IM performed by the NR UE when there is no interference caused by the LTE CRS from the neighboring cell. In addition, the UE may determine, based on its own capability, whether the UE is able to perform LTE CRS-IM.
In order to illustrate the solutions in the embodiments of the present application or the related art, the accompanying drawings to be used in the descriptions of the embodiments or the related art are briefly described below. It should be noted that the accompanying drawings in the following description are some embodiments of the present application.
The solutions in the embodiments of the present application are described below in conjunction with the accompanying drawings in the embodiments of the present application. It should be noted that the described embodiments are only a part of the embodiments of the present application, and not all of them.
As described in the background, in a long term evolution (LTE) and new radio (NR) coexistence network with dynamic spectrum sharing (DSS) or in an LTE and NR coexistence network with spectrum overlap, in case that a neighboring cell for the NR system is in the LTE system, since the cell-specific reference signal (CRS) in the LTE system is a reference signal at a cell level, the CRS always exists and is configured within bandwidth whether physical downlink shared channel (PDSCH) is scheduled or not scheduled in the neighboring cell. In case that spectra of the NR serving cell and the LTE neighboring cell overlaps, it causes a decrease in the PDSCH performance for an NR user equipment (UE) in the serving cell.
At present, as shown in
However, there is no solution to an IM caused by LTE CRS from the neighboring cell to the NR UE in the serving cell.
It should be noted that, as shown in
In order to avoid an interference between an NR PDSCH and an LTE CRS, several CRS patterns may be configured, and the PDSCH performs rate matching on the configured CRS. In case that the rate matching is used for the LTE CRS from the neighboring cell, it results in a decrease in the resource elements for PDSCH of NR UE, and its throughput is affected. Embodiments of the present application provide an IM (cancellation) method for LTE CRS applied to UE side, which may be used to avoid the interference caused by the LTE CRS from the neighboring cell for the NR UE in the serving cell. For an NR UE, it may be interfered by the LTE CRS from the neighboring cell, as shown in
In response to the problems in the related art, embodiments of the present application provide a solution, in which an NR UE receives LTE CRS-IM signaling, and the UE determines, based on the IM signaling, whether an interference caused by an LTE CRS from a neighboring cell exists. In case that the interference caused by the LTE CRS from the neighboring cell exists, the NR UE determines, based on an NR UE capability, whether the NR UE is able to perform LTE CRS-IM (or interference cancellation). In case that the NR UE is able to perform LTE CRS-IM (or interference cancellation), the NR UE performs the LTE CRS-IM; and in case that the NR UE is unable to perform the LTE CRS-IM, the NR UE does not perform the LTE CRS-IM. In addition, in case that it is determined that the interference caused by the LTE CRS from the neighboring cell doesn't exist, the LTE CRS-IM is not performed. It should be noted that the solution provided in the embodiments of the present application may effectively solve the related issues of LTE CRS-IM, and also avoid excessive resource consumption caused by unnecessary LTE CRS-IM performed by the NR UE when interference caused by the LTE CRS from the neighboring cell does not exist. In addition, the UE may determine, based on its own capability, whether the UE is able to perform LTE CRS-IM. Detailed description of the solutions is provided by the present application through specific embodiments in the following.
It should be noted that in the following description, since the methods and the apparatuses are based on the same conception, and the principles of the methods and the apparatuses to solve the problems are similar, the implementation of the apparatuses and methods may be referred to each other, and the similar part is not repeated.
It should be noted that the solutions according to the embodiments of the present application may be applicable to various systems, for example, 5G systems. For example, the applicable systems may be a global system of mobile communication (GSM) system, a code division multiple access (CDMA) system, a wideband code division multiple access (WCDMA) general packet radio service (GPRS) system, a long term evolution (LTE) system, an LTE frequency division duplex (FDD) system, an LTE time division duplex (TDD) system, a long term evolution advanced (LTE-A) system, a universal mobile telecommunication system (UMTS), a worldwide interoperability for microwave access (WiMAX) system, a 5G new radio (NR) system, etc. These various systems include a terminal device and a network device, and may further include a core network part, such as an evolved packet system (EPS), a 5G system (5GS), and the like.
The terminal device in the embodiments of the present application may be a device that provides voice and/or data connectivity to a user, a handheld device with a wireless connection function, or other processing devices connected to a wireless modem. In different systems, the names of the terminal may be different. For example, in the 5G system, the terminal may be called as a user equipment (UE). A wireless terminal device may communicate with one or more core networks (CN)s via a radio access network (RAN), and the wireless terminal may be a mobile terminal device, such as a mobile phone (or cellular phone) and a computer with mobile terminal device, e.g., a portable mobile device, a pocket-sized mobile device, a handheld mobile device, a computer-built mobile device or a vehicle-mounted mobile device, which exchange language and/or data with the radio access network. For example, a personal communication service (PCS) phone, a radio phone, a session initiated protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA) and other devices. A wireless terminal device may also be called a system, a subscriber device, a subscriber station, a mobile station, a mobile platform, a remote station, an access point, a remote terminal, an access terminal, a user terminal, a user agent, or a user device, which is not limited in the embodiments of the present application. Since the terminal device and other network devices (such as a core network device, an access network device (i.e. a network side device)) together form a network being able to support communication, the terminal device may be regarded as a network device in the present application.
The network device in the embodiments of the present application may be a base station, and the base station may include multiple cells providing services for the terminal; and the network device may also be a centralized unit (CU) or a distributed unit (DU). Depending on the specific scenario, the network device may be called an access point, or a device communicating with a wireless terminal device through one or more sectors on the air interface in the access network, or other names. The network device may be used for exchanging received air frames with internet protocol (IP) packets, and acting as a router between the wireless terminal device and the rest of the access network, where the rest of the access network may include an IP communication network. The network device may also mitigate attribute management for the air interface. For example, the network device in the embodiments of the present application may be a base transceiver station (BTS) in a global system for mobile communications (GSM) or a code division multiple access (CDMA), or may be a node B in a wide-band code division multiple access (WCDMA), or may be an evolutional node B (eNB or e-Node B) in a long term evolution (LTE) system, or may be a 5G gNB in 5G network architecture (next generation system), or may be a home evolved node B (HeNB), a relay node, a femto, or a pico, etc., which is not limited in the embodiments of the present application. In some network structures, the network device may include a centralized unit (CU) node and a distributed unit (DU) node, and the centralized unit and the distributed unit may be geographically separated.
In addition, it should be understood that the term “and/or” in the embodiments of the present application describes the association relationship of the associated objects, indicating that three types of relationships may exist, for example, A and/or B, which may indicate the following three cases: A alone, both A and B, and B alone. The character “/” generally indicates that the associated objects before and after is an “or” relationship.
The reference to “an embodiment” or “one embodiment” throughout the specification means that specific features, structures, or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, the words “in an embodiment” or “in one embodiment” appearing throughout the entire specification may not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in one or more embodiments in any suitable manner.
The present application is specifically described in the following.
In an embodiment, as shown in
Step 1: the NR UE receives LTE CRS-IM signaling. The signaling may be radio resource control (RRC) signaling, medium access control-control element (MAC-CE) signaling, downlink control information (DCI) signaling, or a combination thereof.
The LTE CRS-IM signaling may be signaling that only used to notify the NR UE of the existence of LTE CRS interference, or may be signaling that includes specific parameters for LTE CRS-IM.
Step 2: the NR UE determines, based on whether the LTE CRS-IM signaling is received, whether the interference caused by the LTE CRS from the neighboring cell exists. In case that the NR UE receives the LTE CRS-IM signaling, it is indicated that the interference caused by the LTE CRS from the neighboring cell exists; and in case that the NR UE does not receive the LTE CRS-IM signaling, it is indicated that the interference caused by the LTE CRS from the neighboring cell does not exist.
In case that the interference caused by the LTE CRS from the neighboring cell exists, the NR UE determines whether the NR UE itself has the capability for LTE CRS-IM (or CRS interference cancellation). In case that the NR UE has the capability for LTE CRS-IM, the NR UE performs the LTE CRS-IM (or CRS interference cancellation) on PDSCH. After the LTE CRS-IM is performed, PDSCH is directly received.
In an embodiment, the IM scheme for LTE CRS from the neighboring cell may be as follows.
In the embodiment, each CRS antenna port signal s(k, l) at the time domain position l and the frequency domain position k for each CRS antenna port is reconstructed, and channel estimation is performed for the time-frequency domain position (k, l) to obtain the channel response H(k, l) of each CRS antenna port at the corresponding time and frequency domain position. The CRS interference signal R_inter(k, l)=H(k, l)*s(k, l) is reconstructed using the channel response H(k, l) and the CRS antenna port signal s(k, l). The reconstructed CRS interference signal R_inter(k, l) is subtracted from the received PDSCH signal r(k, l) at the time domain and frequency domain position of each CRS antenna port to obtain the PDSCH signal without CRS interference rl(k, l)=r(k, l)−R_inter(k, l).
It should be noted that in case that the NR UE does not have the capability for LTE CRS-IM, PDSCH is directly received. In case that the interference caused by the LTE CRS from the neighboring cell does not exist, PDSCH is directly received.
In an embodiment, when the NR UE initially accesses, the NR UE reports to the base station that whether the NR UE itself has the capability for LTE CRS-IM.
In an embodiment, it should be noted that the capability for LTE CRS-IM is a UE capability, and only the UE having this UE capability is able to perform LTE CRS-IM. In an embodiment, a flag bit in the UE may be used to identify whether the UE has this capability.
In this embodiment, it is determined whether the interference caused by the LTE CRS from the neighboring cell exists firstly; and in case that the interference caused by the LTE CRS from the neighboring cell exists, it is determined whether the NR UE is able to perform LTE CRS-IM based on whether the NR UE has the capability for LTE CRS-IM, and in case that the NR UE has the capability for LTE CRS-IM, the NR UE performs the LTE CRS-IM. The embodiments of the present application may effectively solve the related issues of LTE CRS-IM, and also avoid excessive resource consumption caused by unnecessary LTE CRS-IM performed by the NR UE when interference caused by the LTE CRS from the neighboring cell does not exist. In addition, the UE may determine, based on its own capability, whether the UE is able to perform LTE CRS-IM.
Based on the above embodiments, in an embodiment, the determining whether the interference caused by the LTE CRS from the neighboring cell exists, includes:
In this embodiment, the NR UE determines, based on whether the LTE CRS-IM signaling is received, whether the interference caused by the LTE CRS from the neighboring cell exists. In case that the NR UE receives the LTE CRS-IM signaling, it is determined that the interference caused by the LTE CRS from the neighboring cell exists; and in case that the NR UE does not receive the LTE CRS-IM signaling, the interference caused by the LTE CRS from the neighboring cell does not exist.
In an embodiment, the base station determines, based on whether the NR UE meets one of the following three conditions, whether the interference caused by the LTE CRS from the neighboring cell for the NR UE exists. In case that the interference caused by the LTE CRS from the neighboring cell exists, the base station transmits the LTE CRS-IM signaling to the UE. Condition 1: a serving cell of the NR UE is a dynamic spectrum sharing (DSS) cell, and a neighboring cell of the NR UE is also a DSS cell; condition 2: a serving cell of the NR UE is a DSS cell, and a neighboring cell of the NR UE is an LTE cell; and condition 3: a serving cell of the NR UE is an NR cell, and a neighboring cell of the NR UE is an LTE cell.
In an embodiment, by determining, based on whether LTE CRS-IM signaling is received, whether the interference caused by the LTE CRS from the neighboring cell exists, excessive resource consumption caused by unnecessary LTE CRS-IM performed by the NR UE when the interference does not exist is avoided.
Based on the above embodiments, in an embodiment, the LTE CRS-IM signaling includes:
In an embodiment, the LTE CRS-IM signaling may be signaling that only used to notify the NR UE of the existence of LTE CRS interference (for example, indicates whether the interference exists through “true” or “false”), or may be signaling that includes specific parameters for LTE CRS-IM.
Based on the above embodiments, in an embodiment, the performing LTE CRS-IM includes:
In this embodiment, each CRS antenna port signal s(k, l) at the time domain position l and the frequency domain position k for each CRS antenna port is reconstructed, and channel estimation is performed for the time-frequency domain position (k, l) to obtain the channel response H(k, l) of each CRS antenna port at the corresponding time and frequency domain position. The CRS interference signal R_inter(k, l)=H(k, l)*s(k, l) is reconstructed using the channel response H(k, l) and the CRS antenna port signal s(k, l). The reconstructed CRS interference signal R_inter(k, l) is subtracted from the received PDSCH signal r(k, l) at the time domain and frequency domain position of each CRS antenna port to obtain the PDSCH signal without CRS interference rl(k, l)=r(k, l)−R_inter(k, l).
In this embodiment, a specific scheme for performing LTE CRS-IM is provided. Through the scheme of the embodiment, the related issues of IM caused by the LTE CRS from the neighboring cell to the NR UE in the serving cell may be effectively solved.
Based on the above embodiments, in an embodiment, the obtaining parameters required for performing LTE CRS-IM includes:
In the embodiment, there are multiple implementations for obtaining the parameters required for performing LTE CRS-IM. One is to receive the first signaling used to directly indicate that the interference caused by the LTE CRS from the neighboring cell exists, and obtain, by using blind detection, the parameters required for performing LTE CRS-IM from the LTE broadcast signal from the neighboring cell; another is to receive the first signaling used to directly indicate that the interference caused by the LTE CRS from the neighboring cell exists, and obtain the parameters required for performing LTE CRS-IM from lte-CRS-PatternList1 and/or lte-CRS-PatternList2 in the ServingCellConfig signaling; and another is to receive the second signaling used to indicate the parameters required for performing LTE CRS-IM, and obtain the parameters for performing LTE CRS-IM from the LTE CRS-IM signaling. The embodiment may obtain the parameters required for performing LTE CRS-IM through various implementations, which facilitates application. In the actual process, a suitable implementation may be selected based on the specific situation to obtain the parameters required for performing LTE CRS-IM.
Based on the above embodiments, in an embodiment, the parameters required for performing LTE CRS-IM include one or more of the followings:
In an embodiment, the parameters required for performing LTE CRS-IM may include one or more of the above to assist in subsequent IM.
Based on the above embodiments, in an embodiment, after performing LTE CRS-IM, the method further includes:
In addition, it should be noted that in case that the NR UE is unable to perform LTE CRS-IM, PDSCH is directly received. Or, in case that the interference caused by the LTE CRS from the neighboring cell does not exist, PDSCH is directly received.
In an embodiment, it is determined firstly whether the interference caused by the LTE CRS from the neighboring cell exists; and in case that the interference caused by the LTE CRS from the neighboring cell exists, the LTE CRS-IM signaling is transmitted to the NR UE to notify the NR UE of the existence of LTE CRS interference; and after the NR UE receives the LTE CRS-IM signaling, the NR UE determines, based on whether the NR UE has the capability for LTE CRS-IM, whether the NR UE is able to perform LTE CRS-IM, and in case that the NR UE has the capability for LTE CRS-IM, the NR UE performs the LTE CRS-IM. The embodiments of the present application may effectively solve the related issues of LTE CRS-IM, and also avoid excessive resource consumption caused by unnecessary LTE CRS-IM performed by the NR UE when interference caused by the LTE CRS from the neighboring cell does not exist. In addition, the UE may determine, based on its own capability, whether the UE is able to perform LTE CRS-IM.
Based on the above embodiments, in an embodiment, the determining whether the interference caused by the LTE CRS from the neighboring cell to the NR UE exists, includes:
In an embodiment, referring to the previous description in conjunction with
The following is a detailed explanation and description of the interference mitigation (IM) method provided in the present application through specific embodiments.
LTE CRS-IM signaling is signaling used to notify an NR UE of the existence of LTE CRS interference, and the NR UE obtains, by using blind detection, following specific parameters for performing LTE CRS-IM from signals such as LTE PBCH from a neighboring cell.
Step 1: the NR UE receives the LTE CRS-IM signaling (IMLTE CRS). The LTE CRS-IM signaling is simple signaling that only includes parameters indicating whether an interference caused by an LTE CRS exists (YES/NO). It may be RRC signaling, MAC CE signaling, DCI signaling, or a combination thereof.
Step 2: the NR UE determines, based on whether the LTE CRS-IM signaling is received or not, whether the interference caused by the LTE CRS from the neighboring cell exists. In case that the NR UE receives the LTE CRS-IM signaling, it is indicated that the interference caused by the LTE CRS from the neighboring cell exists; and in case that the NR UE does not receive the LTE CRS-IM signaling, it is indicated that the interference caused by the LTE CRS from the neighboring cell does not exist.
In case that the interference caused by the LTE CRS from the neighboring cell exists, the NR UE determines whether the NR UE itself has the capability for LTE CRS-IM (or CRS interference cancellation). In case that the NR UE has the capability for LTE CRS-IM, the NR UE performs the LTE CRS-IM (or CRS interference cancellation) on PDSCH. After the LTE CRS-IM is performed, PDSCH is directly received.
The IM scheme for LTE CRS from the neighboring cell may be as follows.
In the embodiment, each CRS antenna port signal s(k, l) at the time domain position l and the frequency domain position k for each CRS antenna port is reconstructed, and channel estimation is performed for the time-frequency domain position (k, l) to obtain the channel response H(k, l) of each CRS antenna port at the corresponding time and frequency domain position. The CRS interference signal R_inter(k, l) H(k, l)*s(k, l) is reconstructed using the channel response H(k, l) and the CRS antenna port signal s(k, l). The reconstructed CRS interference signal R_inter(k, l) is subtracted from the received PDSCH signal r(k, l) at the time domain and frequency domain position of each CRS antenna port to obtain the PDSCH signal without CRS interference rl(k, l)=r(k, l)−R_inter(k, l).
In case that the NR UE does not have the capability for LTE CRS-IM, PDSCH is directly received.
In an embodiment, when the NR UE initially accesses, the NR UE reports to the base station that whether the NR UE itself has the capability for LTE CRS-IM, and the base station transmits the LTE CRS-IM signaling to the NR UE.
In case that the interference caused by the LTE CRS from the neighboring cell does not exist, PDSCH is directly received.
LTE CRS-IM signaling is signaling used to notify an NR UE of the existence of LTE CRS interference, and the NR UE obtains following specific parameters for performing LTE CRS-IM from lte-CRS-PatternList1 and/or lte-CRS-PatternList2 in the ServingCellConfig signaling.
Step 1: the NR UE receives the LTE CRS-IM signaling (IMLTE CRS). The LTE CRS-IM signaling is simple signaling that only includes parameters indicating whether an interference caused by an LTE CRS exists (YES/NO). It may be RRC signaling, MAC CE signaling, DCI signaling, or a combination thereof.
Step 2: the NR UE determines, based on whether the LTE CRS-IM signaling is received, whether the interference caused by the LTE CRS from the neighboring cell exists. In case that the NR UE receives the LTE CRS-IM signaling, it is indicated that the interference caused by the LTE CRS from the neighboring cell exists; and in case that the NR UE does not receive the LTE CRS-IM signaling, it is indicated that the interference caused by the LTE CRS from the neighboring cell does not exist.
In case that the interference caused by the LTE CRS from the neighboring cell exists, the NR UE determines whether the NR UE itself has the capability for LTE CRS-IM (or CRS interference cancellation). In case that the NR UE has the capability for LTE CRS-IM, the NR UE performs the LTE CRS-IM (or CRS interference cancellation) on PDSCH. After the LTE CRS-IM is performed, PDSCH is directly received.
The IM scheme for LTE CRS from the neighboring cell may be as follows.
In the embodiment, each CRS antenna port signal s(k, l) at the time domain position l and the frequency domain position k for each CRS antenna port is reconstructed, and channel estimation is performed for the time-frequency domain position (k, l) to obtain the channel response H(k, l) of each CRS antenna port at the corresponding time and frequency domain position. The CRS interference signal R_inter(k, l) H(k, l)*s(k, l) is reconstructed using the channel response H(k, l) and the CRS antenna port signal s(k, l). The reconstructed CRS interference signal R_inter(k, l) is subtracted from the received PDSCH signal r(k, l) at the time domain and frequency domain position of each CRS antenna port to obtain the PDSCH signal without CRS interference rl(k, l)=r(k, l)−R_inter (k, l).
In case that the NR UE does not have the capability for LTE CRS-IM, PDSCH is directly received.
In an embodiment, when the NR UE initially accesses, the NR UE reports to the base station that whether the NR UE itself has the capability for LTE CRS-IM, and the base station transmits the LTE CRS-IM signaling to the NR UE.
In case that the interference caused by the LTE CRS from the neighboring cell does not exist, PDSCH is directly received.
LTE CRS-IM signaling is signaling including specific parameters for LTE CRS-IM, and the NR UE directly reads specific parameters for LTE CRS-IM from the LTE CRS-IM signaling.
Step 1: the NR UE receives the LTE CRS-IM signaling (IMLTE CRS). The LTE CRS-IM signaling is simple signaling that only includes parameters indicating whether an interference caused by an LTE CRS exists (YES/NO). It may be RRC signaling, MAC CE signaling, DCI signaling, or a combination thereof.
Step 2: the NR UE determines, based on whether the LTE CRS-IM signaling is received or not, whether the interference caused by the LTE CRS from the neighboring cell exists. In case that the NR UE receives the LTE CRS-IM signaling, it is indicated that the interference caused by the LTE CRS from the neighboring cell exists; and in case that the NR UE does not receive the LTE CRS-IM signaling, it is indicated that the interference caused by the LTE CRS from the neighboring cell does not exist.
In case that the interference caused by the LTE CRS from the neighboring cell exists, the NR UE determines whether the NR UE itself has the capability for LTE CRS-IM (or CRS interference cancellation). In case that the NR UE has the capability for LTE CRS-IM, the NR UE performs the LTE CRS-IM (or CRS interference cancellation) on PDSCH. After the LTE CRS-IM is performed, PDSCH is directly received.
The IM scheme for LTE CRS from the neighboring cell may be as follows.
In the embodiment, each CRS antenna port signal s(k, l) at the time domain position l and the frequency domain position k for each CRS antenna port is reconstructed, and channel estimation is performed for the time-frequency domain position (k, l) to obtain the channel response H(k, l) of each CRS antenna port at the corresponding time and frequency domain position. The CRS interference signal R_inter(k, l)=H(k, l)*s(k, l) is reconstructed using the channel response H(k, l) and the CRS antenna port signal s(k, l). The reconstructed CRS interference signal R_inter(k, l) is subtracted from the received PDSCH signal r(k, l) at the time domain and frequency domain position of each CRS antenna port to obtain the PDSCH signal without CRS interference rl(k, l)=r(k, l)−R_inter(k, l).
In case that the NR UE does not have the capability for LTE CRS-IM, PDSCH is directly received.
In an embodiment, when the NR UE initially accesses, the NR UE reports to the base station that whether the NR UE itself has the capability for LTE CRS-IM, and the base station transmits the LTE CRS-IM signaling to the NR UE.
In case that the interference caused by the LTE CRS from the neighboring cell does not exist, PDSCH is directly received.
In an embodiment, it should be noted that the NR UE determines, based on whether the interference caused by the LTE CRS from the neighboring cell exists and whether the NR UE has the capability for LTE CRS-IM, that whether LTE CRS-IM is performed. The embodiments of the present application may effectively solve the related issues of LTE CRS-IM, and also avoid excessive resource consumption caused by unnecessary LTE CRS-IM performed by the NR UE when interference caused by the LTE CRS from the neighboring cell does not exist. In addition, the UE may determine, based on its own capability, whether the UE is able to perform LTE CRS-IM.
Finally, it should be noted that the processing mode in the related art is to perform rate matching on the configured CRS on the UE side, rather than to perform interference cancellation on the UE side. The embodiments of the present application may cancel the interference caused by LTE CRS. In addition, in the related art, the CRS pattern used for rate matching is semi statically notified by the RRC, while in the embodiments of the present application, the IM CRS pattern may be semi statically notified by the RRC, be dynamically indicated, or be read from the broadcast.
In an embodiment, the IM CRS pattern may refer to the first signaling used to directly indicate that the interference caused by the LTE CRS from the neighboring cell exists, or the second signaling used to indicate parameters required for performing LTE CRS-IM, both of which are mentioned in the above embodiments.
It should be understood that since the second signaling carries parameters such as the LTE downlink carrier bandwidth, the LTE carrier center frequency, the physical cell ID of the neighboring interfering cell, the number of CRS antenna ports, the MBSFN configuration, and the v-shift, in case that the IM CRS pattern refers to the second signaling, these parameters are included in the IM CRS pattern.
In addition,
It should be noted here that the apparatus may implement all the method steps in the IM method embodiment applied to the new radio (NR) user equipment (UE), and may achieve the same effect. It is not repeated in the present application.
In addition,
It should be noted here that the apparatus may implement all the method steps in the IM method embodiment applied to the base station, and may achieve the same effect. It is not repeated in the present application.
In
The processor 1110 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or a complex programmable logic device (CPLD), and the processor may also adopt multi-core architecture.
The memory 1120 is used for storing computer programs; the transceiver 1100 is used for transmitting and receiving data under a control of the processor; and the processor 1110 is used for obtaining the computer programs in the memory and performing the following operations:
In an embodiment, the determining whether the interference caused by the LTE CRS from the neighboring cell exists, includes:
In an embodiment, the LTE CRS-IM signaling includes:
In an embodiment, the performing LTE CRS-IM includes:
In an embodiment, the obtaining parameters required for performing LTE CRS-IM includes:
In an embodiment, the parameters required for performing LTE CRS-IM include one or more of the followings:
In an embodiment, after performing LTE CRS-IM, the method further includes:
In an embodiment, the IM method further includes:
In an embodiment, the IM method further includes:
In an embodiment, the IM method further includes:
In addition, the processor 1110 is used for reading the computer programs in the memory and performing the following operations:
In an embodiment, the determining whether the interference caused by the long term evolution (LTE) cell-specific reference signal (CRS) from the neighboring cell to the new radio (NR) user equipment (UE) exists, includes:
It should be noted here that the electronic device provided by the embodiments of the present application may implement all the method steps in the IM method embodiment applied to the base station, and may achieve the same effect. It is not repeated in the present application.
It should be noted that the division of devices in the embodiments of the present application is schematic and is only a logical functional division, and there may be other division schemes in actual implementation. In addition, each functional device in each embodiment of the present application may be integrated in a single processing device, or each device may physically exist separately, or two or more devices may be integrated in a single device. The above integrated devices may be implemented either in the form of hardware or in the form of software functional devices.
The integrated device may be stored in a processor readable storage medium in case that it is implemented in the form of a software functional device and sold or used as a separate product. Based on this understanding, the solutions of the present application in essence, or the part contributing to the related art, or all or part of the solutions may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device, etc.) or processor to perform all or part of the steps of the methods described in various embodiments of the present application. The aforementioned storage medium includes: USB flash disk, movable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical discs, and other media that may store program code.
It should be noted here that the above-mentioned apparatuses provided by the embodiments of the present application may implement all the method steps in the above-mentioned method embodiments, and may achieve the same effect. The same parts and beneficial effects as the same method embodiments are not repeated in the present application.
An embodiment of the present application provides a processor readable storage medium, where the processor readable storage medium stores a computer program, and the computer program, when executed by a processor, causes the processor to perform the IM method applied to the new radio (NR) user equipment (UE) or the IM method applied to the base station in the aforementioned embodiment.
The processor readable storage medium may be any available medium or data storage device that the processor may access, including but not limited to magnetic memory (such as floppy disks, hard disks, magnetic tapes, magneto-optical disks (MO), etc.), optical memory (such as CD, DVD, BD, HVD, etc.), and semiconductor memory (such as ROM, EPROM, EEPROM, non-volatile memory (NAND FLASH), solid-state drive (SSD), etc.).
As seen in the above embodiments, the processor readable storage medium stores a computer program used to cause the processor to perform the information determination scheme described above.
Embodiments of the present application may be provided as schemes, systems, or computer program products. Therefore, the present application may take the form of complete hardware embodiments, complete software embodiments, or embodiments combining software and hardware aspects. Moreover, the present application may take the form of computer program products implemented on one or more computer available storage media (including but not limited to disk storage and optical storage, etc.) containing computer available program code.
The present application is described with reference to flowcharts and/or block diagrams of schemes, devices (systems), and computer program products according to embodiments of the present application. It should be understood that each process and/or box in the flowchart and/or block diagram, as well as the combination of processes and/or boxes in the flowchart and/or block diagram, may be implemented by computer executable instructions. These computer executable instructions may be provided to processors of general purpose computers, specialized computers, embedded processors, or other programmable data processing devices to produce a machine such that the indication executed by processors of computers or other programmable data processing devices may produce devices for implementing the functions specified in one or more processes of the flowchart and/or one or more boxes of the block diagram.
These processor executable instructions may also be stored in a processor readable memory capable of directing a computer or other programmable data processing device to operate in a particular manner such that the indication stored in the processor readable memory produce manufactured products including indication devices that implement the function specified in one or more processes of a flowchart and/or one or more boxes of a block diagram.
These processor executable instructions may also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on the computer or other programmable device to produce computer-implemented processing, thereby the indication executed on the computer or other programmable device provide steps for implementing the functions specified in one or more processes of the flowchart and/or one or more boxes of the block diagram.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202110363752.4 | Apr 2021 | CN | national |
The present application is a US National Stage of International Application No. PCT/CN2022/079262, filed on Mar. 4, 2022, which claims priority to Chinese patent application No. 2021103637524, filed on Apr. 2, 2021, entitled “Interference Coordination Processing Method and Apparatus, Electronic Device, and Storage Medium”, which are hereby incorporated by reference in their entireties.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2022/079262 | 3/4/2022 | WO |
