HK1221562B - Method and system of advanced interference cancellation on pdsch at the ue - Google Patents

Description

Advanced interference cancellation method and system for PDSCH at UE

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to U.S. Provisional Patent Application No. 61/863,902, filed on August 8, 2013, entitled “ADVANCED WIRELESS COMMUNICATION SYSTEMS AND TECHNIQUES,” the entire disclosure of which is incorporated herein by reference.

Technical Field

Embodiments disclosed herein relate generally to the field of wireless communications, and more particularly, to the provision of information for facilitating interference mitigation in wireless networks.

Background of the Invention

It is becoming increasingly important to be able to provide telecommunication services to both fixed and mobile users as efficiently and cost-effectively as possible.In addition, the growing use of mobile applications has led to widespread interest in developing wireless systems capable of transferring large amounts of data at high speeds.

The development of more efficient and higher bandwidth wireless networks has become increasingly important, and the problem of how to maximize the efficiency of such networks is still under research. Many techniques for maximizing the efficiency of such networks involve increasing frequency channel reuse, and therefore, co-channel interference (from inter-cell users or co-scheduled intra-cell users) becomes a significant limiting factor in achieving higher network capacity.

BRIEF DESCRIPTION OF THE DRAWINGS

Aspects, features, and advantages of embodiments of the present invention will become apparent from the following description of the embodiments with reference to the accompanying drawings, in which like numerals represent like elements, and in which:

FIG1 is a block diagram of an exemplary wireless network according to various embodiments;

FIG2 is a flowchart illustrating an exemplary method in an eNodeB according to various embodiments;

FIG3 is a flowchart illustrating an exemplary method in a user equipment according to various embodiments;

FIG4 is a block diagram illustrating how determination of a soft buffer size for a transport block and a soft buffer size for a code block may be performed according to various embodiments;

FIG5 is a table showing each PRB pair and each interference layer allocation for a modulation that may be broadcast in a DCI transmitted in a common or UE-specific search space, according to various embodiments;

FIG6 is a table showing an exemplary indication to a UE of each modulation scheme using a PRB set according to various embodiments;

FIG7 is a conventional {antenna port(s), scrambling flag, and layer number indication} mapping table according to various embodiments;

FIG8 is a first new {antenna port(s), scrambling identity and indication of number of layers} mapping table with UE-specific antenna ports 11, 13 for PDSCH transmission with up to two layers according to various embodiments;

FIG9 is a second new {antenna port(s), scrambling identity, and layer number indication} mapping table with UE-specific antenna ports 9, 10 for PDSCH transmission with up to two layers according to various embodiments;

FIG10 is a third alternative, combined form of a new {indication of antenna port(s), scrambling identity, and number of layers} mapping table with a 4-bit index according to various embodiments;

FIG11 is a new {antenna port(s), indication of scrambling entity and number of layers} mapping table of a second alternative, combined form with a 3-bit index according to various embodiments;

FIG12 is a fourth new {antenna port(s), scrambling identifier, and layer number indication} mapping table with UE-specific antenna ports 11, 13, 9, 10 for PDSCH transmission on the first four layers according to various embodiments;

FIG13 is a block diagram illustrating an exemplary system, according to various embodiments; and

14 is a block diagram illustrating an example wireless device configured for communicating in a wireless network according to one or more inventive methods disclosed herein.

Detailed description of the embodiment

Illustrative embodiments of the present disclosure include, but are not limited to, methods, systems, and apparatus for mitigating interference on a physical downlink shared channel (PDSCH) at a user equipment (UE) in a wireless network.

The various aspects of the descriptive embodiments will be described using the terms commonly used by those skilled in the art to express the essence of their work to other persons skilled in the art. However, it will be apparent to those skilled in the art that some alternative embodiments may be implemented using a portion of the described aspects. For illustrative purposes, specific numbers, materials, and configurations are provided to provide a complete understanding of the descriptive embodiments. However, it will be apparent to those skilled in the art that alternative embodiments may be implemented without specific details. In other examples, well-known features are omitted or simplified to avoid making the descriptive embodiments difficult to understand.

Furthermore, various operations will be described as multiple separate sequential operations in a manner that is most helpful for understanding the illustrative embodiments; however, the order of description should not be interpreted as implying that these operations are necessarily order-dependent. In particular, these operations do not need to be performed in the order described.

The phrases "according to some embodiments" and "in various embodiments" are used repeatedly. These phrases generally do not refer to the same embodiment; however, they may refer to the same embodiment. The terms "comprising," "including," and "having" are synonymous unless the context indicates otherwise. The phrase "A/B" means "A or B." The phrase "A and/or B" means "(A), (B), or (A and B)." The phrase "at least one of A, B, and C" means "(A), (B), (C), (A and B), (B and C), (A and C), or (A, B, and C)." The phrase "(A)B" means "(B) or (AB)," i.e., A is optional.

Although specific embodiments have been shown and described herein, those skilled in the art will appreciate that numerous alternative and/or equivalent embodiments may be substituted for the specific embodiments shown and described without departing from the scope of the embodiments of the present disclosure. This application is intended to cover any adaptations or modifications of the embodiments discussed herein. It is, therefore, intended that the embodiments of the present disclosure be limited only by the claims and their equivalents.

As used herein, the term "module" may refer to (or be part of, or include) a dedicated integrated circuit, an electronic circuit, a processor (shared, designated, or group) and/or memory (shared, designated, or group) that executes one or more software or firmware instructions and/or programs, a combinational logic circuit, and/or other appropriate components that provide the described functionality.

FIG1 schematically illustrates a wireless communication network 100 according to various embodiments. The wireless communication network 100 (hereinafter referred to as “network 100”) may be an access network of a 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) or Long Term Evolution Advanced (LTE-A) network, such as an Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN).

The network 100 may include a first base station (e.g., an evolved node base station (eNB) 102) configured to communicate with one or more mobile devices or terminals (e.g., a first user equipment (UE) A 104 and/or a second UE B 106). In various embodiments, the eNB 102 may be a fixed station (e.g., a fixed node) or a mobile station/node.

The wireless communication network 100 also includes a second evolved node base station (eNB) 110 covering a cell range that overlaps with the cell range of the first eNB 102, the second eNB 110 being configured to wirelessly communicate with one or more other mobile device(s) or terminal(s), such as a third user equipment (UE) C 108, or indeed with the same UEs (104 and 106) of the first eNB 102. Thus, the wireless communication network 100 may be considered an example of a heterogeneous network comprising cells of different sizes, each of which may reuse radio resources within the network as appropriate and may be subject to inter-cell interference, intra-cell interference, or both forms of interference.

In various embodiments, the UEs 104-108 and/or the eNBs 102, 110 may include multiple antennas for implementing a multiple-input, multiple-output (MIMO) transmission system that may operate in a variety of MIMO modes, including single-user MIMO (SU-MIMO), multi-user MIMO (MU-MIMO), closed-loop MIMO, open-loop MIMO, or variations of small antenna processing. The UEs 104-108 may provide some type of channel state information (CSI) feedback to the eNBs 102, 110 via one or more uplink channels, and the eNBs 102, 110 may adjust one or more downlink channels based on the received CSI feedback. The accuracy of the CSI feedback may affect the performance of the MIMO system.

In various embodiments, the uplink channel and the downlink channel may be associated with one or more frequency bands, which may or may not be shared by the uplink channel and the downlink channel. The one or more frequency bands may also be divided into one or more sub-bands, which may or may not be shared by the uplink channel and the downlink channel. Each frequency sub-band, one or more aggregated sub-bands, or one or more frequency bands of an uplink channel or a downlink channel (wideband) may be referred to as a frequency resource.

The base station 102 may be configured, for example, to reuse frequency resources for communication with the first UE 104 and the second UE 106 by using Multi-User Multiple Input Multiple Output (MU-MIMO) technology.

Although some embodiments are described with reference to LTE networks, some embodiments may be used with other types of radio access networks.

The following inventive embodiments can be used in various types of applications, including transmitters and receivers of radio systems, although the invention is not limited in this respect. Specifically included within the scope of the present disclosure are radio systems including, but not limited to, network interface cards (NICs), network adapters, fixed or mobile client devices, relay stations, base stations, home base stations, gateways, bridges, hubs, routers, access points, or other network devices. Furthermore, radio systems within the scope of the present invention can be implemented in cellular wireless telephone systems, satellite systems, two-way radio systems, and computing devices that include these radio systems, including personal computers (PCs), tablet computers and related peripherals, personal digital assistants (PDAs), personal computing accessories, handheld communication devices, and all systems that may be related and to which the principles of the inventive embodiments may be applied.

To increase the capacity of wireless communication networks (such as LTE-A networks), heterogeneous networks using MU-MIMO and cell-splitting gain have been proposed. However, in both scenarios, co-channel interference from inter-cell or co-scheduled intra-cell users will be the main limiting factor in achieving higher network capacity. For example, although MU-MIMO utilizes beam steering to limit the signal power of a signal transmitted to a second UE 106 received at a first UE 104, the signal will still appear to the first UE to some extent. If the first and second UEs utilize the same frequency and time resources (i.e., radio resources), the signal transmitted to the second UE 106 may cause co-channel interference at the first UE 104, and therefore, since the first UE 104 is the UE being interfered with (i.e., the victim of interference), it can now also be referred to as a victim UE. Of course, interference can also occur in the other direction, i.e., a signal transmitted to the first UE 104 may cause co-channel interference at the second UE 106, in which case the second UE 106 will be the victim UE. These are exemplary forms of intra-cell interference.

Similarly, while the third UE 108 is communicating with the second base station 110, if the same radio resources are used for communication between the first UE 104 and the first eNB 102, the signal transmitted to the third UE 108 may generate inter-cell interference at the first UE 104, and vice versa (and also with reference to the second UE 106).

In traditional systems, this co-channel (intra-cell) or inter-cell interference is mitigated by using coordinated multi-point (CoMP) technology, which helps avoid interference at the transmitting base station (i.e., on the network side). However, by accounting for the spatial properties of interference, interference mitigation on the UE side can also provide promising gains in spectral efficiency. In this article, interference mitigation may also be referred to as interference cancellation and/or interference suppression.

According to some embodiments, interference mitigation at the receiver side (e.g., a receiver of a UE) may be enhanced by using advanced interference cancellation algorithms at a receiver (e.g., a receiver of a UE) based on information related to an interfering signal (e.g., an interfering signal structure) provided to the UE. For example, the receiver may be provided with side knowledge of the interfering signal, such as, but not limited to, the modulation format, the presence and characteristics of the interference, its transmission mechanism (including allocation), its reference symbols, and its modulation and/or coding, which is not available at the UE side in traditional wireless communication networks. This information may be provided to the first UE 104 by, for example, the first eNB 102 using message 112. A receiver using the advanced interference cancellation algorithms described herein may be used to provide performance improvements for various physical channels (e.g., but not limited to, a physical downlink shared channel (PDSCH), a physical downlink control channel (PDCCH), an enhanced physical downlink control channel (EPDCCH), etc.).

According to some embodiments, an advanced receiver structure and corresponding signaling of PDSCH is provided.

According to some embodiments, the first UE 104 may receive and encode one or more messages 114 transmitted by the second base station 110, which provide information about an interfering signal transmitted from the second base station 110 to the third UE 108. The first UE 104 may be provided with configuration data by the first base station 102 to allow the first UE 104 to identify relevant information within the message 114 transmitted by the second base station 110. In some embodiments, the first UE 104 may be informed of the parameters of the interfering signal directly from the eNB 110 (e.g., over the air interface). In some other embodiments, the parameters of the interfering signal may be transmitted over, for example, a backhaul link between the eNBs (e.g., using the X2-AP interface 120 between the eNBs). Accordingly, the second base station 110 may transmit the parameters to the first base station 102 for handover to the first UE 104 for interference cancellation and mitigation at the first UE 104.

The detailed embodiments described below provide several ways in which additional information about the structure of interference can be conveyed to the UE 104 to assist in interference mitigation at the UE.

2 , an exemplary method 200 performed at an eNB 102 of a wireless network 100 is shown in accordance with some embodiments. Initially, a communication channel between a first UE 104 and the eNB 102 is established (202), for example, using a standard UE registration procedure, to attach to the network and request radio resources for communication. Once the eNB 102 has registered the presence of the first UE 104 and allocated frequency resources for communication with the first UE 104, the eNB may identify any other ongoing communications (204), such as communications with a second UE 106, that use the same frequency resources and may therefore cause interference at the first UE 104. If a possible interfering signal transmitted by the eNB 102 is identified, information about the interfering signal is communicated to the first UE 104 (206).

Then, eNB 102 may further identify signals transmitted by neighboring eNBs, such as eNB 110, that utilize the same frequency resources (208). Similarly, if a possible interfering signal is identified, such as a communication between a second eNB 110 and a third UE 108, information regarding the corresponding interfering signal is communicated to first UE 104 (210).

According to some embodiments, the eNB 102 may identify only interfering signals transmitted by itself (e.g., blocks 204/206) or, alternatively, only interfering signals transmitted by neighboring eNBs (blocks 208/210). For each identified signal, information regarding the interfering signal, or information regarding the characteristics of the interfering signal, may be provided from the eNB 102 to the first UE 104 as a separate message for each identified signal, or may be combined into a single communication for all identified interference sources. In some embodiments, the information regarding the interfering signal may be provided as part of downlink control information (DCI) or as part of other high-level signaling, such as a medium access control (MAC) or radio resource control (RRC) message provided to the UE (e.g., the first UE 104) that receives the corresponding interference.

According to some embodiments, the interference signal information provided by the first eNB 102 to the victim UE (e.g., the first UE 104) may be in the form of parameters identifying control information transmitted by the base station 102 or a neighboring eNB 110, which includes parameters related to the interference signal and should be monitored and decoded by the victim UE (e.g., the first UE 104). For example, the base station 102 may provide information to enable the user equipment 104 to receive and decode downlink channel information (DCI) related to other user equipment in the network.

FIG3 illustrates an exemplary method 300 performed by a victim UE (e.g., first UE 104) in wireless network 100, according to various embodiments. First UE 104 requests allocation of frequency resources from eNB 102 (302) and receives information regarding the allocated resources. First UE 104 also obtains information (304) from the eNB defining parameters used in a coding process for encoding interfering signals also received at the victim UE (e.g., first UE 104). These may be interfering signals (one or more) related to other signals transmitted by eNB 102 and/or neighboring eNBs. The obtained information defining parameters used in the coding process for encoding the interfering signals may include information on characteristics of the received interfering signals, which may include, for example, the modulation format of the potential interfering signal, the presence and characteristics of the interference, its transmission mechanism (including allocation), its reference symbols, and its modulation and/or coding. The first UE 104 then uses the obtained information defining parameters used in the encoding process used to encode the interfering signal, mitigates interference by decoding the interfering symbols using the obtained information, and performs interference cancellation and/or suppression on the provided signal using the decoded interfering signal.

Different advanced receiver structures (such as maximum likelihood (ML), successive interference cancellation (SIC) (also referred to as linear codeword level interference cancellation (L-CWIC) type receivers), maximum a posteriori probability (MAP) (also referred to as maximum likelihood-codeword level interference cancellation (ML-CWIC) type receivers), etc.) may require different levels of signaling support. Therefore, according to various embodiments, different parameters that can be provided to different receiver type structures to facilitate interference cancellation are disclosed. In some different embodiments, some other improvements that can be used to improve the operation of advanced interference cancellation/suppression receivers are also disclosed. The proposed signaling (and some advanced receiver structures) disclosed in some embodiments can facilitate the operation of advanced interference cancellation/suppression receivers.

According to various embodiments, codeword level interference cancellation (CWIC - i.e., L-CWIC and ML-CWIC) type receivers (e.g., SIC and MAP receivers) may be used for PDSCH. The operating principle of the SIC (i.e., L-CWIC) and MAP (i.e., ML-CWIC) receivers may rely on the possibility of demodulating and decoding the interference layer(s) at the victim UE (i.e., the UE being interfered with) for the purpose of interference cancellation. The operating principle of the SIC (i.e., L-CWIC) and MAP (i.e., ML-CWIC) receivers may also rely on the possibility of re-encoding the interference layer(s) at the victim UE for the purpose of interference cancellation. That is, interference suppression/cancellation may be improved by demodulating and decoding (and possibly re-encoding) any interfering signal so that it can be properly removed from the (primary) signal intended to be received. The difference between a continuous interference cancellation (SIC) (e.g., L-CWIC) and a maximum a posteriori probability (MAP) receiver (e.g., ML-CWIC) is that the output of a SIC (L-CWIC) receiver for the interference layer(s) is hard bits, while the output of a MAP (ML-CWIC) receiver for the interference layer(s) is a soft indicator that also indicates the likelihood of the decoder decision. Since SIC (L-CWIC) and MAP (ML-CWIC) receiver processing may involve decoding of the interference layer(s), according to an embodiment, the victim UE receiver may be provided with information about the hypothesis used to generate the corresponding interference signal (e.g., the interference signal caused by a signal destined for transmission to another UE in a neighboring cell).

According to an embodiment, section 5.1.4.1.2 of technical specification 36.212 of the LTE-A standard defines how the sequence encoded at the eNB transmitter is obtained. In particular, the soft buffer portion and the circular buffer size NIR are determined as follows:

…

The soft buffer size of the transport block is represented by NIR bits, and the soft buffer size of the rth code block is represented by Ncb bits. The size of Ncb is obtained as follows, where C is the number of code blocks calculated in Section 5.1.2:

- For DL-SCH and PCH transport channels,

- For UL-SCH and MCH transport channels, N _cb = K _w

Here, NIR is equal to:

here:

If the UE signals ue-Category-v10xy (e.g., referred to as ue-Category-v1020 in recent standard documents) and is configured with transmission mode 9 or transmission mode 10 for the DL cell, then Nsoft is the total number of soft channel bits [4] according to the UE policy indicated by ue-Category-v10xy[6]. Alternatively, Nsoft is the total number of soft channel bits [4] according to the UE policy indicated by ue-Category[6].

If N _soft = 35982720,

K _C = 5,

Otherwise, if N _soft = 3654144, and the UE can support no more than two spatial layers for the DL cell,

K _C = 2

otherwise

K _C = 1

Finish.

K _MIMO is equal to 2 if the UE is configured to receive PDSCH transmissions based on transmission mode 3, 4, 8, 9 or 10 as defined in section 7.1 of [3] and equal to 1 otherwise.

If the UE is configured with more than one serving cell, and if at least two serving cells have different UL/DL configurations, the MDL-HARQ is the maximum number of DL HARQ processes as defined in Table 7-1 of [3] for the DL reference UL/DL configuration of the serving cell. Otherwise, the MDL-HARQ is the maximum number of DL HARQ processes as defined in Section 7 of [3].

Mlimit is a constant equal to 8.

Denote by E the ratio of the length of the matching output sequence for the rth encoded block, by rvidx the redundant version number of this transmission (rvidx=0, 1, 2 or 3), and the ratio of the matching output bit sequence is ek, k=0, 1, ..., E-1.

…

In recent standard documents, the parameter “ue-Category-v10xy” has been referred to as “ue-Category-v1020”, which is a parameter indicating the category of the user equipment involved.

For convenience, FIG4 illustrates the soft buffer partitioning for determining the circular buffer size, according to an embodiment. Specifically, this figure illustrates the determination of the soft buffer size for a transport block and the soft buffer size for a code block, according to various embodiments. According to the embodiment shown in FIG4 , for a transport block, a soft buffer 401 of size Nsoft is divided into multiple memory blocks 402 of size NIR . Each memory block 402 corresponds to a HARQ process and a codeword (i.e., a spatial stream), which may be related to the currently used transmission mode (TM). Each memory block 402 of size NIR is further subdivided into multiple code blocks 403 of size NCB , where NCB is derived based on the above formula. The encoding process at the eNB may be performed by generating a code sequence of a convolutional turbo code (CTC). The code sequence of the convolutional turbo code (CTC) may consist of systematic bits and parity bits. The parity bits from the first and second component codes may be represented as "Parity 1" and "Parity 2" in FIG4 . The actual coded sequence sent by the eNB to the UE can be derived from the coded sequence of the CTC by reading the coded sequence from a circular buffer 405 of size NCB (starting at a position determined by the redundancy version number rvidx). When the index of the coded sequence reaches the end of the circular buffer 405 of size NCB, the coded sequence is read again from the beginning of the circular buffer. A similar (i.e., complementary, so that it remains synchronized) buffer management process can be performed on the UE side to store the received bits for subsequent decoding.

According to various embodiments, the encoded bit sequence sent to a corresponding victim UE may depend on parameters used in the corresponding encoding process, such as the following parameters: Nsoft signaled in the UE category (e.g., ue-Category-v10xy, ue-Category-v1020, or ue-Category); the user equipment (UE) capability of supporting two spatial layers for a downlink (DL) cell; the number of hybrid automatic repeat request (HARQ) processes; and the number of cells configured in carrier aggregation (VA). That is, the victim UE may receive information about the HARQ soft buffer partition by configuring one or more encoding parameter sets that may include parameters defining the UE category, the UE capability of supporting at least two spatial layers for a DL cell, the number of HARQ processes, and the number of component carriers (CCs). Because these parameters are UE-specific, some uncertainty may arise at the victim UE regarding the decoding of the interfering signal. Therefore, different solutions to this problem are provided in different embodiments.

One embodiment may include indicating information about the HARQ soft buffer partition to the victim UE by configuring one or more sets, the one or more sets including radio resource control (RRC) coding parameters {ue-Category-v10xy, UE capability for supporting two spatial layers for the DL cell, number of HARQ processes, number of CCs}, where the ue-Category-v10xy (e.g., ue-Category-v1020) parameter indicates the Nsoft value that the UE should assume to be used to encode the coded sequence of the corresponding interfering layer. Then, by means of DCI signaling, the embodiment may dynamically indicate the specific set that should be used to decode the interfering layer. In the case where only a single set configuration exists, DCI-based signaling selection may not be used.

In another embodiment, it can be assumed that at the victim UE, the same parameters {ue-Category-v10xy (e.g., ue-Category-v1020), UE capability of supporting two spatial layers for DL cells, number of HARQ processes, number of CCs} as those used for decoding the service signal (i.e., the main signal intended to be received) also apply to the interfering signal/layer.

Another embodiment may configure the default values of the coding parameters {ue-Category-v10xy (e.g., ue-Category-v1020), UE capability for DL cells supporting two spatial layers, number of HARQ processes, number of CCs}, which should be used for decoding of the serving layer and/or interference layer. In these embodiments, the configured parameters {ue-Category-v10xy (e.g., ue-Category-v1020), UE capability for DL cells supporting two spatial layers, number of HARQ processes, number of CCs} should not exceed the current (victim) UE capability.

In an exemplary embodiment using an ML receiver or a symbol layer IC receiver for receiving PDSCH, in order to improve interference suppression/cancellation performance, the ML receiver should be able to process more spatial layers than the number of receiver antennas. In fact, this can also be applied to any implementation based on L-CWIC or ML-CWIC receiver. For example, a victim UE with two antennas should be able to process three or more spatial layers (e.g., three or more) using the maximum likelihood criterion. For a UE with a maximum of three layer processing capabilities, the layer partitioning between the serving node and the interfering node can be, for example, as follows:

{The number of serving layers is 1, and the number of interfering layers is 0, 1, or 2}

{The number of service layers is 2, the number of interference layers is 0 or 1}

In such exemplary embodiments using an ML receiver or a SIC receiver, in order to support the use of such a receiver (i.e., capable of processing more streams than the number of receiver antennas), at least two modulation schemes corresponding to up to two interference layers should be signaled to the victim UE. The modulation indicated can be, for example, {Spare, QPSK, 16QAM, 64QAM}, where "Spare" can indicate a spare physical resource block (PRB) pair, "QPSK" is quadrature phase shift modulation, "16QAM" is 16-point quantized quadrature amplitude modulation, and "64QAM" is 64-point quantized quadrature amplitude modulation. As described above, the allocation of each PRB pair and each layer of the modulation scheme can be broadcast in a DCI message, which is transmitted in a common or UE-specific search space.

An exemplary embodiment of data transmitted in this exemplary embodiment using an ML receiver or a SIC receiver is shown in the table of Figure 5. The modulation assignment may also be signaled for a PRB set comprising a plurality of adjacent PRB pairs.

In this exemplary embodiment using an ML receiver or a SIC receiver, another exemplary embodiment of the transmitted data is as shown in the table of FIG6 , where, for each modulation scheme, a PRB set may be indicated to the UE, where the “PRB set” is a bitmap, and a 1 (or 0) in the bitmap indicates a specific PRB on a specific layer carrier of a PDSCH having the indicated modulation scheme.

Similar signaling may be defined for the precoding matrix indicator (PMI) on the interfering cell(s), with PMIs of different ranks (or only ranks 2 and above) being provided to the victim UE for each PRB or PRG (precoding resource group).

In another embodiment, a power boost of the PDSCH relative to a cell-specific reference signal (CRS) is signaled for each PRB or set of PRBs from the set {-6, -4.77, -3, -1.77.0, 1, 2, 3} dB.

In some other embodiments (which may also include some or all aspects of the previous exemplary embodiments), reference signal enhancement may be provided. In these exemplary embodiments, in order to facilitate channel measurement (i.e., provide accurate channel estimation from more than two spatial layers (e.g., serving signal and interfering signal)), the victim UE-specific reference signal (RS) should support up to four orthogonal antenna ports for serving signal and interfering signal. By assigning different orthogonal antenna ports to the serving signal and the interfering signal, the impact of the RS dedicated to the UE from the interfering or serving can be cancelled (or removed) during the channel estimation of the interfering and serving channels respectively.

In a first RS embodiment, antenna ports 7, 8 and 11, 13 (e.g., processed with an orthogonal cover code (OCC) length of 4) can be used, for example, for scheduling PDSCH transmissions with up to two layers for serving and interfering signals, with the two layers having orthogonal UE-specific RS antenna ports. Examples of conventional (e.g., traditional) and new {antenna port(s), scrambling identity, and layer number indication} mapping tables according to this embodiment are shown in Figures 7 and 8, respectively. When one or two layers are used, the new table is obtained by replacing antenna ports 7 and 8 in the conventional table with antenna ports 11 and 13. The indication of which UE-specific antenna ports are used for PDSCH can be signaled with the help of an additional bit in, for example, DCI formats 2C/2D (or other formats that may or may not be based on DCI formats 2C/2D). This additional bit can be used to switch between the conventional and new {antenna port(s), scrambling entity, and number of layer indications} mapping tables (see Figures 7 and 8). In another embodiment, RRC signaling may instead be used to switch between these tables, in which case DCI-based selection may not be required.

In an alternative RS embodiment, 4 orthogonal antenna ports for UE-specific RS for PDSCH can be implemented by using UE-specific RS antenna ports 7, 8 and 9, 10 for serving and interfering signals (e.g., processing and frequency division multiplexing of length 2 of OCC). The conventional and new {antenna port(s), scrambling identifier, and indication of the number of layers} mapping tables according to this embodiment are shown in Figures 7 and 9, where the new table is obtained by replacing antenna ports 7 and 8 in the conventional table with antenna ports 9 and 10 when 1 or 2 layers are used.

In another alternative RS embodiment, a new DCI format (e.g., DCI format 2E) can be used for interference cancellation (IC). For example, the tables of Figures 7 and 9 can be combined into a single table that uses 4 bits to determine the antenna port used to transmit the serving or interfering PDSCH signal - see Figure 10.

In some embodiments, it may be assumed that interference cancellation may be configured only for PDSCH transmissions of no more than 4 layers, in which case the entries in Figures 7 and 9 corresponding to PDSCH transmissions of no more than 4 layers may be combined into a single {antenna port(s), scrambling identifier, and number of layers} mapping table that uses 3 bits to determine the antenna port used to transmit the serving or interfering PDSCH signal - see Figure 11. In this case, there may be no need to redefine or change the existing DCI format. Furthermore, for such exemplary embodiments, depending on the additional configuration signaled from the network, for example, PDSCH resource element (RE) mapping may be performed using antenna ports 7, 8 or antenna ports 9, 10 or antenna ports 7, 8, 9, 10.

In some embodiments, UE-specific antenna ports 11, 13, 12, and 14 may be used for PDSCH transmission on the first four layers. An example of a {antenna port(s), scrambling identifier, and layer number indication} mapping table according to this embodiment is shown in FIG12 , where a new table is obtained by replacing antenna ports 7, 8, 9, and 10 in the conventional table with antenna ports 11, 13, 12, and 14.

In other alternative RS embodiments, using RRC signaling, the network may configure one table from two available tables (eg, FIG. 7 (legacy) and 12 (new)) that the UE should use for antenna port, scrambling identity, and layer indication.

In some other embodiments (which may also include some or all aspects of the previous exemplary embodiments), PRB bundling for the interfering channel may be used. That is, in order to improve channel estimation performance for UE-specific reference signals on the interfering layer, RRC signaling may be used to configure the UE with a PRB bundling assumption for (one or more) interfering layers. If PRB bundling is configured on the interfering cell, the victim UE may assume the same precoding vector across a set of adjacent PRBs in the interfering signal.

In some other embodiments (which may also include some or all aspects of the previous exemplary embodiments), signaling of PDSCH RE mapping may be used. In this case, for most receivers (but especially CWIC receivers), it may be desirable to signal the PDSCH RE mapping used on the interfering signal/layer. In this case, the network may configure (e.g., using RRC signaling) one or more sets of information including the following parameters for the victim UE: {PDSCH start, zero power channel state information reference signal (ZP CSI-RS), non-zero power channel state information reference signal (NZP CSI-RS), MBSFN subframe (multicast broadcast single frequency network), CRS configuration (cell ID and CRS antenna port)}. For PDSCH transmission, the specific set used by the interfering node(s) may then be signaled, for example, in the DCI using the IPQI bit (i.e., interfering PDSCH RE mapping and similar co-located signaling bits). In another embodiment, only a subset of parameters (e.g., ZP CSI-RS, NZP CSI-RS, MBSFN subframe, and CRS configuration parameters corresponding to (one or more) interfering cells) can be provided, for example, using RRC signaling. In another embodiment, only a subset of parameters {PDSCH start, ZP CSI-RS, NZP CSI-RS, MBSFN subframe, CRS configuration parameters} corresponding to the interfering cell can be configured to the UE. These additional encoding parameters of the interference signal signaled to the corresponding interfered UE (i.e., the victim UE) can further assist in decoding the interference signal and, therefore, assist in the cancellation/suppression of the corresponding interference signal in the interference cancellation and suppression receiver used in the victim UE.

It should be understood that embodiments of the present invention may be implemented in hardware, software, or a combination of hardware and software. Any such software may be stored in the following forms: a volatile or non-volatile storage device (e.g., a storage device similar to a ROM, whether erasable or rewritable), or a memory (e.g., RAM, a memory chip, a device, or an integrated circuit) or a machine-readable storage device (e.g., a DVD, a memory stick, or a solid-state medium). It should be understood that storage devices and storage media are embodiments of non-transitory machine-readable storage devices suitable for storing programs or programs containing instructions that, when executed, implement the embodiments discussed and claimed herein. Thus, embodiments provide machine executable code for implementing systems, devices, or methods as described herein or as claimed herein and machine-readable storage devices for storing such programs. Still further, such programs may be transmitted electronically via any medium (such as a communication signal carried over a wired or wireless connection), and the embodiments appropriately cover the same.

Any such hardware may take the form of a suitably programmable processor, such as, for example, a programmable general-purpose processor designed for mobile devices, such as an FPGA or ASIC, which together constitute an embodiment of a processing circuit configured or configurable to perform the functions of the above examples and embodiments. Any such hardware may also take the form of a chip or chipset arranged to operate according to any one or more of the above-described diagrams, which diagrams and related descriptions may be used in conjunction or individually with any and all permutations.

The eNBs 102, 110 and UEs (104, 106, 108) described herein can be implemented in a system using any appropriate hardware and/or software configured as desired. For one embodiment, FIG13 illustrates an exemplary system 500 including one or more processors 540, system control logic 520 coupled to at least one processor 540, system memory 510 coupled to the system control logic 520, non-transitory memory (NVM)/storage device 530 coupled to the system control logic 520, and a network interface 560 coupled to the system control logic 520. The system control logic 520 can also be coupled to an input/output device 550.

The processor(s) 540 may include one or more single-core or multi-core processors. The processor 540 may include any combination of general-purpose processors and specialized processors (e.g., graphics processors, application processors, baseband processors, etc.). The processor 540 is operable to execute the methods described above using appropriate instructions or programs (i.e., via operation using processor, or other logic, instructions). The instructions may be stored in the system memory 510 as the interference mitigation logic memory portion 515, or may additionally or alternatively be stored in the (NVM)/storage device 530 as the NVM interference mitigation logic instruction portion 535.

Processor(s) 540 may be configured to perform the embodiments of Figures 2-3 according to various embodiments. In embodiments where system 500 implements eNB 102, processor(s) 540 may be configured to transmit interference signal characteristic information 112 to UE 102, for example, including interference signal coding parameters as described herein.

For one embodiment, the system control logic 520 may include any suitable interface controller to provide any suitable interface to the at least one processor and/or to any suitable device or component in communication with the system control logic 520 .

For one embodiment, system control logic 520 may include one or more memory controllers (not shown) to provide an interface to system memory 510. System memory 510 may be used, for example, to load and store data and/or instructions for system 500. For one embodiment, system 510 may include any suitable volatile memory, such as, for example, a suitable dynamic random access memory (DRAM).

The NVM/storage 530 may include one or more tangible, non-transitory computer-readable media for storing data and/or instructions. For example, the NVM/storage 530 may include any suitable non-volatile memory, such as, for example, flash memory, and/or may include any suitable non-volatile memory, such as, for example, one or more hard disk drives (HDDs), one or more compact disk (CD) drives, and/or one or more digital versatile disk (DVD) drives.

NVM/storage device 530 may include a storage resource that is physically part of the device on which system 500 is installed, or it may be accessible to the device but not necessarily part of the device. For example, NVM/storage device 530 may be accessed over a network via network interface 560.

System memory 510 and NVM/storage device 530 may each include, among other things, temporary and persistent copies of instruction memory portions, respectively, that hold interference mitigation logic 515 and 535. Interference mitigation logic instruction portions 515 and 535 may include instructions that, when executed by at least one processor 540, cause system 500 to implement one or both of methods 200 and/or 300, or any other embodiment described herein. In some embodiments, instruction portions 515 and 535, or hardware, firmware, and/or software components thereof, may additionally or alternatively reside in system control logic 520, network interface 560, and/or processor 540.

The network interface 560 may have a transceiver module 565 to provide a radio interface for the system 500 to communicate over one or more networks (e.g., wireless communication networks) and/or with any other suitable devices. In various embodiments, the transceiver 565 may be integrated with other components of the system 500. For example, the transceiver 565 may include one of the processor(s) 540, the memory of the system memory 510, and the NVM/storage of the NVM/storage device 530. The network interface 560 may include any suitable hardware and/or firmware. The network interface 560 may be operably coupled to multiple antennas to provide a multi-input, multi-output radio interface. For one embodiment, the network interface 560 may include, for example, a network adapter, a wireless network adapter, a telephone modem, and/or a wireless modem.

For one embodiment, at least one of the processor(s) 540 may be packaged together with the logic for one or more controllers of the system control logic 520. For one embodiment, at least one of the processor(s) 540 may be packaged together with the logic for one or more controllers of the system control logic 520 to form a system-in-package (SiP). For one embodiment, at least one of the processor(s) 540 may be integrated with the logic for one or more controllers of the system control logic 520 on the same chip. For one embodiment, at least one of the processor(s) 540 may be integrated with the logic for one or more controllers of the system control logic 520 on the same chip to form a system-on-chip (SoC).

In various embodiments, I/O device 550 may include a user interface designed to enable a user to interact with system 500, a peripheral component interface designed to enable peripheral components to interact with system 500, and/or a sensor designed to determine environmental conditions and/or location information related to system 500.

FIG. 14 illustrates an embodiment in which the system 500 implements the UEs 104 , 106 , 108 in the specific form of a mobile device 600 .

In various embodiments, the user interface may include, but is not limited to, a display 640 (e.g., a liquid crystal display, a touch screen display, etc.), a speaker 630, a microphone 690, one or more cameras 680 (e.g., a still camera and/or a video camera), a flash (e.g., an LED flash), and a keyboard 670.

In various embodiments, the peripheral component interface may include, but is not limited to, a non-volatile memory port, an audio jack, and a power interface.

In various embodiments, the sensors may include, but are not limited to, a gyroscope sensor, an accelerometer, a proximity sensor, an ambient light sensor, and a positioning unit. The positioning unit may also be part of (or interact with) the network interface 560 to communicate with components of a positioning network (e.g., Global Positioning System (GPS) satellites).

In various embodiments, the system 500 may be a mobile computing device, such as, but not limited to, a desktop computing device, a tablet computing device, a netbook, a mobile phone, etc. In various embodiments, the system 500 may have more or fewer components, and/or a different architecture.

In various embodiments, the implemented network may be the 3rd Generation Partnership Project Long Term Evolution (LTE) Advanced wireless communication standard, which may include but is not limited to 3GPP's LTE-A standard releases 8, 9, 10, 11, and 12, or later releases.

Although certain embodiments have been shown and described herein for purposes of illustration, various alternative and/or equivalent embodiments or implementations contemplated to achieve the same purpose may be substituted for the illustrated and described embodiments without departing from the scope of this disclosure. This disclosure is intended to cover any alternatives or variations of the embodiments discussed herein. Therefore, the embodiments discussed herein are expressly intended to be limited only by the claims and their equivalents.

In various embodiments, a method for mitigating interference on a physical downlink shared channel (PDSCH) at a user equipment in a wireless communication system is provided, wherein the user equipment includes an interference cancellation receiver for receiving the PDSCH, the method comprising: at the user equipment, receiving a PDSCH in which at least one interference signal is present; at the user equipment, obtaining information defining parameters used in a coding process for encoding at least one interference signal; and when receiving the PDSCH, based on the obtained information, suppressing interference caused by the at least one interference signal by decoding the at least one interference signal using parameters defined by the obtained information, and using the decoded at least one interference signal for interference cancellation.

In various embodiments, obtaining information defining parameters used in an encoding process for encoding at least one interfering signal at a user equipment includes: receiving, at the user equipment, information about HARQ soft buffer partitions by configuring one or more parameter sets, the one or more parameter sets including the following parameters: parameters defining UE classification, parameters defining UE capability for supporting at least two spatial layers for a DL cell, parameters defining the number of HARQ processes, parameters defining the number of component carriers (CCs); and receiving an indication indicating which of the one or more parameter sets to use for decoding at least one interfering signal; or assuming, at the user equipment, that the same parameter sets: parameters defining UE classification, parameters defining UE capability for supporting at least two spatial layers for a DL cell, parameters defining the number of HARQ processes, parameters defining the number of CCs, are used for decoding of the serving signal and also apply to the at least one interfering signal; or receiving and using default values of the following parameters for decoding of the serving signal and the at least one interfering signal: parameters defining UE policy, parameters defining UE capability for supporting at least two spatial layers for a DL cell, parameters defining the number of HARQ processes, parameters defining the number of CCs.

In various embodiments, wherein the interference cancellation receiver comprises an interference cancellation and suppression receiver, and wherein obtaining information defining parameters used in an encoding process for encoding at least one interfering signal at a user equipment further comprises: receiving, via signaling, at least two modulation schemes corresponding to at least two interfering signals.

In various embodiments, wherein the at least two modulations include: spare, QPSK, 16QAM, and/or 64QAM, and wherein spare indicates an empty physical resource block (PRB) pair.

In various embodiments, the method may further include broadcasting to the user equipment, in a DCI transmission in a UE-specific or common search space, the per-PRB-pair and per-layer assignments of at least two modulation schemes to be used.

In various embodiments, wherein there are multiple PRB sets, and wherein the modulation allocation signaling includes signaling for a PRB set, the PRB set contains multiple adjacent PRB pairs.

In various embodiments, receiving at least two modulation schemes corresponding to at least two interference layers via signaling includes receiving an indication of each modulation scheme via a bitmap, wherein a specific binary value "1" in the bitmap indicates a specific PRB on a specific layer carrier of a PDSCH having the indicated modulation scheme.

In various embodiments, receiving at least two modulation schemes corresponding to at least two interfering layers by signaling includes receiving signaling of a precoding matrix indicator (PMI) defined for an interfering cell, wherein PMIs of different ranks (or only ranks 2 and above) are provided to the user equipment for each PRB or precoding resource group (PRG).

In various embodiments, the described methods may also include power boosting of the PDSCH relative to the cell-specific reference signal (CRS), as signaled over each PRB.

In various embodiments, the power boost of PDSCH is signaled from the set {-6, -4.77, -3, -1.77.0, 1, 2, 3} dB per PRB.

In various embodiments, the described methods may also include providing, at the UE, a capability to process more spatial layers than the number of antennas used on the UE, wherein the spatial layers comprise the received data streams.

In various embodiments, the received data stream comprises a service data stream or an interference data stream.

In various embodiments, the serving data flow is a data flow intended to be received at the user equipment, the interfering data flow is a data flow not intended to be received at the user equipment, and the interfering data flow interferes with reception of the serving data flow.

In various embodiments, wherein at least two spatial layers are received at a user equipment, wherein the spatial layers include serving signals or interfering signals, and wherein signaling includes using additional bits in the DCI format to indicate which UE-specific antenna ports are used for interfering PDSCH.

In various embodiments, UE-specific RS may use: antenna ports 11 and 13 for PDSCH transmission with 1 or 2 spatial layers; or antenna ports 9 and 10 for PDSCH transmission with 1 or 2 spatial layers.

In various embodiments, DCI bits or RRC signaling are used between the new {(one or more) antenna ports, scrambling identifier and number of layers} mapping table and the traditional {(one or more) antenna ports, scrambling identifier and number of layers} mapping table to determine the antenna port used for PDSCH transmission.

In various embodiments, wherein the DCI format comprises DCI format 2E, 4 bits are used to determine the antenna port(s), the scrambling identity, and the number of layers used.

In various embodiments, a mapping table is used by a user equipment to determine the antenna port, scrambling identity, and layer for PDSCH transmission.

In various embodiments, the described method may further include improving channel estimation performance for a UE-specific reference signal on the interfering signal by configuring a PRB bundling assumption for the interfering signal using RRC signaling.

In various embodiments, the described method may further include receiving signaling of PDSCH RE mapping used on the interfering signal, wherein the signaling includes other configuration information for the user equipment, the other configuration information including one or more data sets having the following parameters: {PDSCH start, ZP CSI-RS, NZP CSI-RS, MBSFN subframe, CRS configuration}, where the CRS configuration includes the number of CRS antenna ports and the cell ID.

In various embodiments, where signaling PDSCH RE mapping includes signaling and similarly co-located signaling using interfering PDSCH RE mapping, IPQI, bits in DCI transmissions.

In various embodiments, a device for use in a wireless communication system is provided, the device comprising: a processing circuit for: receiving a PDSCH in which at least one interference signal is present; obtaining information defining parameters used in a coding process for encoding the at least one interference signal; and when receiving the PDSCH, based on the obtained information, suppressing interference caused by the at least one interference signal by decoding the at least one interference signal using parameters defined by the obtained information, and using the decoded at least one interference signal for interference cancellation.

In various embodiments, the circuit may further be configured to: receive information about the HARQ soft buffer partition configuration by configuring one or more parameter sets, obtain coding parameters of at least one encoded interference signal from the obtained feature information, the one or more parameter sets including the following parameters: parameters defining UE classification, parameters defining UE capability for a DL cell to support at least two spatial layers, parameters defining the number of HARQ processes, parameters defining the number of component carriers (CCs), and receive an indication indicating which of the one or more parameter sets to use for decoding the at least one interference signal; or assume that the same set of parameters: parameters defining UE policy, parameters defining UE capability for a DL cell to support at least two spatial layers, parameters defining the number of HARQ processes, parameters defining the number of CCs used for decoding the service signal are also applicable to the at least one interference signal; or receive and use default values of the following parameters for decoding the service signal and the at least one interference signal: parameters defining UE policy, parameters defining UE capability for a DL cell to support at least two spatial layers, parameters defining the number of HARQ processes, parameters defining the number of CCs.

In various embodiments, the apparatus may further include an interference cancellation receiver, and wherein the circuitry configured to obtain information defining parameters used in a process for encoding at least one interfering signal is further configured to receive, via signaling, at least two modulation schemes corresponding to the at least two interfering signals.

In various embodiments, the circuitry may be further configured to process, at the UE, a greater number of spatial layers than the number of antennas used on the UE, wherein the spatial layers comprise the received data streams.

In various embodiments, the circuitry may be further configured to receive at least two spatial layers, wherein the spatial layers include serving signals or interfering signals, and wherein the circuitry is further configured to signal, using additional bits in the DCI format, an indication of which UE-specific antenna ports are used for interfering PDSCH.

In various embodiments, the UE-specific RS may be configured to use antenna ports 11 and 13 for PDSCH transmission with 1 or 2 spatial layers, or antenna ports 9 and 10 for PDSCH transmission with 1 or 2 spatial layers.

In various embodiments, the circuitry may be configured to use a mapping table for determining antenna ports, scrambling identities, and layers for PDSCH transmission.

In various embodiments, the circuit may be further configured to signal a PDSCH RE mapping to be used on an interfering signal, wherein the signal includes other configuration information for the user equipment, the other configuration information including one or more sets of data having the following parameters: {PDSCH start, ZP CSI-RS, NZP CSI-RS, MBSFN subframe, CRS configuration}, where the CRS configuration includes the number of CRS antenna ports and the cell ID.

In various embodiments, where signaling PDSCH RE mapping may include using signaling of interfering PDSCH RE mapping and similar co-located signaling, IPQI, bits in DCI transmission.

In various embodiments, a circuit for use in an eNodeB in a wireless communication system may be provided, the circuit comprising: a device for transmitting a first downlink signal to a first user equipment; a device for identifying other signals in the wireless communication system, which are expected to interfere with the first downlink signal transmitted to the first user equipment; and a device for transmitting information defining parameters used in an encoding process to the first user equipment, the encoding process being used to encode the other signals in the wireless communication system, which are expected to interfere with the first downlink signal transmitted to the first user equipment.

In various embodiments, a non-transitory computer readable medium including computer program instructions may be provided that, when executed on a processor, causes the method of claim 1 to be performed.

In various embodiments, a user device may be provided that includes any of the apparatus described herein, and may also include, for example, one or more of: a screen, a speaker, a touch screen, a keyboard, an antenna array including multiple antennas, an image processor, or an application processor.

Claims (23)

1. A method for mitigating interference on a Physical Downlink Shared Channel (PDSCH) at a User Equipment (UE) in a wireless communication system, wherein the UE includes an interference cancellation receiver for receiving data on the PDSCH, the method comprising: At the user equipment, the PDSCH containing at least one interference signal is received; At the user equipment, information is obtained regarding the parameters defined in the encoding process used to encode the at least one interference signal; When the PDSCH is received, based on the obtained information, the interference caused by the at least one interference signal is suppressed by decoding the at least one interference signal using the parameters defined by the obtained information and by using the decoded at least one interference signal for interference cancellation; and At the user equipment, the ability to process a spatial layer greater than the number of antennas used on the user equipment is provided, wherein the spatial layer includes received data streams. 2. The method of claim 1, wherein obtaining information at the user equipment defining parameters used in the encoding process for encoding the at least one interference signal includes: At the user equipment, information about the Hybrid Automatic Repeat Request (HARQ) soft buffer partition is received by configuring one or more parameter sets, which include the following parameters: parameters defining UE classification, parameters defining UE capabilities supporting at least two spatial layers for downlink DL cells, parameters defining the number of HARQ procedures, and parameters defining the number of component carrier CCs; and Receive an indication indicating which of the one or more parameter sets is used for decoding the at least one interfering signal; or At the user equipment, it is assumed that the same set of parameters is used: parameters defining UE classification, parameters defining UE capabilities supporting at least two spatial layers for the DL cell, parameters defining the number of HARQ procedures, parameters defining the number of CCs, and these parameters used for decoding the serving signal also apply to the at least one interfering signal; or The following parameters are received and their default values are used for decoding the service signal and the at least one interference signal: parameters defining the UE policy, parameters defining the UE capability supporting at least two spatial layers for DL cells, parameters defining the number of HARQ procedures, and parameters defining the number of CCs. 3. The method of claim 1, wherein the interference cancellation receiver comprises an interference cancellation and suppression receiver, and wherein obtaining information at the user equipment defining parameters used in the encoding process for encoding the at least one interference signal further comprises: The signaling receives at least two modulation schemes corresponding to at least two interference signals. 4. The method of claim 1, wherein the received data stream includes a service data stream or an interference data stream. 5. The method of claim 4, wherein the service data stream is a data stream intended to be received at the user equipment, the interfering data stream is a data stream not intended to be received at the user equipment, and the interfering data stream interferes with the reception of the service data stream. 6. The method of claim 3, wherein at least two spatial layers are received at the user equipment, wherein the spatial layers include service signals or interference signals, and wherein the signaling includes using additional bits in the downlink control information (DCI) format to indicate which UE-dedicated antenna ports are used for the interference PDSCH. 7. The method of claim 3, wherein the UE-specific reference signal RS uses: Antenna ports 11 and 13 are used for PDSCH transmission with 1 or 2 space layers; or Antenna ports 9 and 10 are used for PDSCH transmission with 1 or 2 space layers. 8. The method of claim 7, wherein the DCI bit or RRC signaling is used between a new {one or more antenna ports, scrambling identifier and layer number} mapping table and a conventional {one or more antenna ports, scrambling identifier and layer number} mapping table to determine the antenna port for PDSCH transmission. 9. The method of claim 8, wherein the DCI format includes DCI format 2E, and 4 bits are used to identify one or more antenna ports, a scrambling identifier, and the number of layers used. 10. The method of claim 1, wherein the mapping table is used by the user equipment to determine the antenna port, scrambling identifier, and layer for PDSCH transmission. 11. The method of claim 1, further comprising: improving the channel estimation performance of the UE-specific reference signal on the interference signal by configuring the PRB binding assumption on the interference signal using RRC signaling. 12. The method of claim 1, further comprising: receiving signaling for PDSCH RE mapping on the interference signal, wherein the signaling includes other configuration information for the user equipment, the other configuration information including one or more data sets having the following parameters: {PDSCH start, ZP CSI-RS, NZP CSI-RS, MBSFN subframe, CRS configuration}, wherein the CRS configuration includes the number of CRS antenna ports and the cell ID. 13. The method of claim 12, wherein the signaling PDSCH RE mapping includes signaling using interfering PDSCH RE mapping and similar co-location signaling, IPQI, and bits in the DCI transmission. 14. An apparatus for a user equipment (UE) in a wireless communication system, the apparatus comprising processing circuitry for: Obtain characteristic information about at least one encoded interference signal; The encoding parameters of the at least one encoded interference signal are obtained from the acquired feature information; When a PDSCH containing at least one encoded interference signal is received, the at least one interference signal is decoded using the obtained encoding parameters, and the decoded at least one interference signal is used during the interference cancellation process to eliminate the interference caused by the at least one encoded interference signal; and Processing a spatial layer that has more antennas than the number used on the UE, wherein the spatial layer includes the received data stream. 15. The apparatus of claim 14, wherein the circuitry is further configured to: The encoding parameters of the at least one encoded interference signal are obtained from the obtained feature information by acquiring information about the Hybrid Automatic Repeat Request (HARQ) soft buffer partition configuration based on one or more parameter sets, wherein the one or more parameter sets include the following parameters: parameters defining UE classification, parameters defining UE capabilities supporting at least two spatial layers for downlink DL cells, parameters defining the number of HARQ procedures, parameters defining the number of component carriers (CCs), and receiving an indication indicating which of the one or more parameter sets is used for decoding the at least one interference signal; or By assuming that the same set of encoding parameters applied to the received PDSCH signal also applies to the at least one encoded interfering signal, the encoding parameters of the at least one encoded interfering signal are obtained from the acquired feature information. These encoding parameters of the received PDSCH signal include: parameters defining UE classification, parameters defining UE capabilities supporting at least two spatial layers for DL cells, parameters defining the number of HARQ procedures, and parameters defining the number of CCs. These parameters used for decoding the serving signal also apply to the at least one interfering signal; or By using the default values of the encoding parameters, the encoding parameters of the at least one encoded interference signal are obtained from the obtained feature information for decoding the service signal and the at least one interference signal. The encoding parameters include: parameters defining UE classification, parameters defining UE capabilities supporting at least two spatial layers for DL cells, parameters defining the number of HARQ procedures, and parameters defining the number of CCs. 16. The apparatus of claim 14, further comprising an interference cancellation receiver, wherein the circuitry configured to obtain encoding parameters of the at least one encoded interference signal from the obtained feature information is further configured to receive, via signaling, at least two modulation schemes corresponding to at least two interference signals. 17. The apparatus of claim 14, wherein the circuitry is further configured to receive at least two spatial layers, wherein the spatial layers include service signals or interference signals, and wherein the circuitry is further configured to use additional bits in the downlink control information (DCI) format to signal an indication of which UE-dedicated antenna ports are being used to interfere with the PDSCH. 18. The apparatus of claim 16, wherein the UE-specific reference signal RS is configured to use: Antenna ports 11 and 13 are used for PDSCH transmission with 1 or 2 space layers, or Antenna ports 9 and 10 are used for PDSCH transmission with 1 or 2 space layers. 19. The apparatus of claim 14, wherein the circuitry is further configured to transmit a PDSCH RE mapping over the at least one interference signal, wherein the PDSCH RE mapping signal includes additional configuration information for the user equipment, the additional configuration information including one or more sets of data having the following parameters: {PDSCH start, ZP CSI-RS, NZP CSI-RS, MBSFN subframe, CRS configuration}, wherein the CRS configuration includes the number of CRS antenna ports and the cell ID. 20. The apparatus of claim 19, wherein the PDSCH RE mapping signal includes bits in the transmission of signaling that uses interfering PDSCH RE mapping and similar co-location signaling, IPQI, DCI transmission. 21. A non-transitory computer-readable medium comprising computer program instructions that, when executed on a processor, cause the method of any one of claims 1-13 to be performed. 22. A user equipment comprising the means of any one of claims 14-20, further comprising one or more of the following: a screen, a speaker, a touch screen, a keyboard, an antenna array including multiple antennas, an image processor, or an application processor. 23. An apparatus for a user equipment in a wireless communication system, comprising means for performing the method as described in any one of claims 1-13.