Inter-cell interference cancellation framework

Interference Elimination Framework for Cell Service Area

Claim priority based on patent law

This patent application requests to enjoy the priority of provisional application No. 61/080,051 filed on July 11, 2008 and titled "Systems and Methods for Uplink Inter-cell Interference Cancellation Using Hybrid Automatic Repeat (HARQ) Retransmissions", This provisional application has been assigned to the assignee of this application, so its entire content is expressly incorporated into this application by reference.

Generally speaking, the present invention relates to wireless communication. Specifically, the present invention relates to various electronic circuits or algorithms for interference management in wireless networks, but is not limited to this.

Nowadays, wireless networks have been widely deployed to provide customers with various services, such as telephone, data, video, audio, messaging, broadcast, and so on. Wireless networks enable broadband communications to be carried out in a region, nationwide, or even globally. This type of network is sometimes called a wireless wide area network (WWAN). A common example of WWAN is a cellular network that supports CDMA 2000, which is a telecommunications standard that uses code division multiple access (CDMA) to send voice, data, and signaling between mobile users. Another example of WWAN is a cellular network that provides broadband Internet access to mobile users, such as Evolution Data Optimized (EV-DO) or Ultra Mobile Broadband (UMB), both of which are wireless interface standards Part of the CDMA 2000 series. Other examples include WCDMA, HSPA, LTE (long-term evolution), and LTE-Advanced. Generally, these cellular networks provide coverage in multiple cellular areas, in which mobile users are served by a fixed site base station located in the service area of each cell.

In a specific example used in the network, the terminal can communicate with the serving base station on the forward link and/or the reverse link. On the forward link, the terminal can observe strong interference from the interfering base station. On the reverse link, the serving base station can observe strong interference from the interfering terminal. Interference on each link will reduce the performance of data transmission sent on this link. In future revisions of wireless standards such as LTE, base stations capable of supporting different powers (for example, high-power macro cell service areas and lower-power pico cell service areas) are required. In addition, some cell service areas (referred to as femtocell service areas hereinafter) work under "restricted association" or closed user group (CSG) conditions, that is, they only allow certain user terminals (UE) to connect to them . For example, these UEs belong to users who have subscribed to a specific access plan provided by a service provider.

In the traditional homogeneous arrangement, in general, the UE is connected to the cell service area with the best geometric conditions (for example, signal-to-noise ratio). However, in some cases such as disjoint links, the cell service area of the strongest forward link may be different from the cell service area of the strongest reverse link (or vice versa) due to the geometric conditions of the strongest forward link. Therefore, the UE may be connected to a weaker cell service area. In addition, in a heterogeneous arrangement, there will also be benefits when the UE is connected to a weaker base station. For example, the UE can be connected to the cell service area with the lowest path loss (even if the cell service area has poor geometric conditions) to reduce interference to the network. Similarly, in the case of restricted association, the UE may be forced to connect to a base station with a weaker geometric condition, because the UE is not allowed to access the base station with the strongest geometric condition.

A brief overview of the application is given below to provide a basic understanding of some aspects of the disclosed aspects. This summary is not a general summary, nor is it intended to identify key or important elements or describe the scope of these aspects. Its purpose is to present some concepts of the described features in a simple form as a prelude to the detailed description that follows.

According to one or more aspects and their corresponding content, the various aspects described in this application eliminate the interference channel by using an identifier for encoding the interference channel. The network entity (for example, the serving base station and/or the interfering base station) performs transmission adjustments to change the signal to interference plus noise ratio (SINR) of one of these channels, thereby improving interference cancellation.

In one aspect, this application provides a method for facilitating interference cancellation in the service area of a wireless cell at a serviced user equipment (UE) by a network. The method includes: transmitting a first identifier to the serviced UE Encoding the first link, wherein the served UE also receives from the interfering base station the interference second link encoded with a second identifier; transmitting the second identifier to the UE; The served UE receives feedback, where the feedback represents the ability of the served UE to eliminate one of the first link and the second link from the received signal; responding to the feedback, The transmission is adjusted so that the signal-to-interference plus noise ratio (SINR) of one of the first link and the second link has a relative change; wherein when the second link is received with a higher SINR Link, the served UE eliminates the second link in the following manner: uses the second identifier to decode the second link; uses the second identifier to decode the second link; The second link is re-encoded; the second link is eliminated from the received signal; the first link is decoded from the received signal through channel estimation.

In another aspect, the present application provides at least one processor for facilitating interference cancellation in the service area of a wireless cell by the network at the UE being served. The first module transmits the first link coded with the first identifier to the served UE, wherein the served UE also receives the interfering second link coded with the second identifier from the interfering base station . The second module transmits a second identifier to the UE and receives feedback from the served UE, where the feedback indicates that the served UE eliminates the first link and the received signal from the received signal. The capability of one of the second links. The third module is used to respond to the feedback and adjust the transmission so that the signal to interference plus noise ratio (SINR) of one of the first link and the second link changes relatively. When the second link is received with a higher SINR, the served UE eliminates the second link in the following manner: uses the second identifier to decode the second link; Re-encoding the second link using the second identifier; eliminating the second link from the received signal; and decoding the first link from the received signal through channel estimation.

In another aspect, this application provides a computer program product used by the network to promote interference cancellation in the service area of the wireless cell at the UE receiving the service. The computer-readable storage medium includes: a first code set for the computer to transmit a first link coded with a first identifier to a served UE, wherein the served UE also receives from the interfering base station The second link of the interference encoded with the second identifier; the second code set is used to make the computer transmit the second identifier to the UE and receive feedback from the served UE, where The feedback indicates the ability of the served UE to eliminate one of the first link and the second link from the received signal; the third code set is used to make the computer respond to the feedback , The transmission is adjusted so that the signal-to-interference plus noise ratio (SINR) of one of the first link and the second link has a relative change. When the second link is received with a higher SINR, the served UE eliminates the second link in the following manner: uses the second identifier to decode the second link; Re-encoding the second link using the second identifier; eliminating the second link from the received signal; and decoding the first link from the received signal through channel estimation.

In another aspect, the present application provides a device used by the network to promote interference cancellation in the service area of a wireless cell at a UE receiving a service. The means for transmitting the first link coded with the first identifier to the UE under service is given, wherein the UE under service also receives the first link coded with the second identifier from the interfering base station. Two links. A means for transmitting the second identifier to the UE and for receiving feedback from the served UE is given, wherein the feedback means that the served UE eliminates all the signals from the received signal. The capability of one of the first link and the second link. A component used to respond to the feedback and adjust the transmission so that the signal to interference plus noise ratio (SINR) of one of the first link and the second link changes relatively. When the second link is received with a higher SINR, the served UE eliminates the second link in the following manner: uses the second identifier to decode the second link; Re-encoding the second link using the second identifier; eliminating the second link from the received signal; and decoding the first link from the received signal through channel estimation.

In another aspect, this application provides a device used by the network to promote interference cancellation in the service area of a wireless cell at a UE receiving a service. The transmitter transmits the first link coded with the first identifier to the served UE, wherein the served UE also receives the interfering second link coded with the second identifier from the interfering base station. The transmitter also transmits the second identifier to the served UE. The transmitter of the first link or the receiver at the interfering base station receives feedback from the UE under service, wherein the feedback indicates that the UE under service eliminates the first signal from the received signal. Capability of one of a link and the second link. The computing platform is used to respond to the feedback and adjust the transmission so that the signal to interference plus noise ratio (SINR) of one of the first link and the second link changes relatively. When the second link is received with a higher SINR, the served UE eliminates the second link in the following manner: uses the second identifier to decode the second link; Re-encoding the second link using the second identifier; eliminating the second link from the received signal; and decoding the first link from the received signal through channel estimation.

In one aspect, this application provides a method for helping non-served UEs to achieve interference cancellation in a wireless cell service area. When the serving base station transmits the first link coded with the first identifier to the unserved UE, it transmits the interference second link coded with the second identifier. A communication message is received from the serving base station, and the communication message indicates that the non-served UE needs to perform interference cancellation on the interfering second link. The transmission of the interfering second link is adjusted to facilitate interference cancellation by the unserved UE.

In another aspect, this application provides a computer program product that helps non-served UEs realize interference cancellation in wireless cell service areas. The computer-readable storage medium includes a code set for causing the computer to perform the following operations: when the serving base station transmits the first link encoded with the first identifier to the unserved UE, the second identifier is transmitted Encoding the second link of interference; receiving a communication message from the serving base station, the communication message indicating that the non-served UE needs to perform interference cancellation on the interfering second link; direct or indirect direction The non-served UE transmits the second identifier; the transmission of the interfering second link is adjusted to help the non-served UE achieve interference cancellation.

In another aspect, this application provides a device that helps non-served UEs to achieve interference cancellation in a wireless cell service interval. A transmitting means is provided for when the serving base station transmits the first link encoded with the first identifier to the unserved UE, the second link with the interference encoded with the second identifier is transmitted. A receiving component is provided for receiving a communication message from the serving base station, the communication message indicating that the non-served UE needs to perform interference cancellation on the interfering second link. A second identifier transmitting component is provided for directly or indirectly transmitting the second identifier to the unserved UE. An adjustment component is provided for adjusting the transmission of the interfering second link, so as to facilitate interference cancellation by the unserved UE.

In another aspect, this application provides a device that helps non-served UEs to achieve interference cancellation in a wireless cell service interval. The transmitter is used for transmitting, when the serving base station transmits the first link encoded with the first identifier to the unserved UE, the second link with interference encoded with the second identifier. The receiver is configured to receive a communication message from the serving base station, the communication message indicating that the non-served UE needs to perform interference cancellation on the interfering second link. The transmitter is also used to directly or indirectly transmit the second identifier to the unserved UE. The computing platform is used to adjust the transmission of the interfering second link so as to help the non-served UE to achieve interference cancellation.

In order to achieve the foregoing and related purposes, one or more aspects include the features fully described below and specifically pointed out in the scope of the patent application. The following description and drawings describe certain illustrative aspects in detail, but the following description and drawings merely illustrate some of the different ways in which the basic principles of these aspects can be adopted. Through the detailed description given below in conjunction with the accompanying drawings, other advantages and novel features will become apparent, and the aspects disclosed in this application are intended to include all these aspects and their equivalents.

For UEs (User Equipment) that are affected by significant interference signals transmitted by different base stations, the communication technology described in this application can achieve efficient communication. It is helpful to assume a synchronization system, which means that both the femtocell service area and the picocell service area can access synchronization sources such as the Global Positioning System (GPS). The disclosed interference cancellation technology (including UE-centric and network-centric) is suitable for this situation. These techniques are particularly advantageous when it is undesirable or difficult to make changes in the physical (PHY) layer and medium access control (MAC) layer of the existing base station. The UE-centric ("backward compatibility") framework refers to a method approach mainly implemented by the UE, which includes a pico cell service area or a femto cell service area. The closed-loop coordination of the network-centric framework between the base station and the UE realizes interference reduction, thereby improving network performance. Specifically, the interfering base station can help the "victim" UE through the following operations: adjust the downlink pilot frequency and control power; adjust the traffic data rate in response to the information provided by the "victim" UE, which provides The information includes information about the interference link and the cancellation performance itself (for example, CQI (channel quality index) and ACK (acknowledgement) before cancellation). The feedback information can be sent over the air or using backhaul.

The term "exemplary" used in this application means "serving as an example, illustration, or illustration." Any embodiment described as "exemplary" in this application should not be construed as being more preferable or advantageous than other embodiments. The embodiments disclosed in this application can be applied to any of the following technologies or their combination: Code Division Multiple Access (CDMA) system, Multi-Carrier CDMA (MC-CDMA), Broadband CDMA (W-CDMA), High Speed Packet Access ( HSPA, HSPA+), time division multiple access (TDMA) system, frequency division multiple access (FDMA) system, orthogonal frequency division multiple access (OFDMA) system or other multiple access technology. The wireless communication system can be designed to implement one or more standards, such as IS-95, CDMA 2000, IS-856, W-CDMA, TD-SCDMA, and other standards.

The description set forth below in conjunction with the accompanying drawings is a description of various structures of the present invention, but does not indicate that the present invention can be implemented only in these structures. The description includes specific details to provide a thorough understanding of the present invention. However, it is obvious that for those skilled in the art, the present invention can be implemented without these specific details. In some instances, in order to avoid obscuring the concept of the present invention, well-known structures and components are presented in the form of block diagrams.

Referring now to the drawings, in FIG. 1, the wireless communication system 100 helps to mitigate UE (UE_B) 102 executes the cell service area interference cancellation framework 101, so as to communicate with the second UE in the presence of_A 108 strong interfering eNB for communication_A In the case of 106, the evolution base station (eNB_B) 104 for effective communication.

In one aspect of the present invention, the UE_B The interference cancellation performed by the computing platform 110 of 102 is used to allow decoding of signals affected by strong interference. In one aspect, interference cancellation can be applied to pilot frequency channels ("pilot frequencies") 112, control channels 114, and traffic channels 116. Because the interference is caused by different base stations eNB_A 106, so some other information can be used in this elimination process. For example, the interference can be estimated by decoding the interference and its identifier, and then using the corresponding identifier to re-encode the interference. The above estimation can also be accomplished by estimating the transmitted modulation symbols through soft estimation, repeated estimation or some other techniques.

In one aspect, UE_B The pilot frequency interference cancellation (PIC) element 118 of the computing platform 110 of 102 obtains information from the received signal (ie, from the eNB_B 104 downlink 120 and from eNB_A 106 in the downlink 106) in the combination from the stronger eNB_A 106 of the pilot frequency 112, and then strive to obtain the weaker eNB_B 104 downlink 120 transmitted. Even if traffic interference cancellation is not used, the PIC component 118 is advantageous. In some interference avoidance schemes, the eNB_A 106 Using eNB_B 104 downlink resources. Even in this case, due to traditional reasons, the eNB_A 106 can transmit RS (ie, reference signal, alternative name for pilot frequency). If the eNB_A 106 RS and eNB_B The RS of 104 overlaps, so in order to be able to_B For better estimation of 104 channels, PIC is necessary or advantageous. If the eNB_A 106 RS and eNB_B 104 traffic channels overlap, then the UE_B 102 can zero LLR (Log Likelihood Probability) or try to eliminate eNB from its signal_A 106's guide frequency. As shown in 124, interference cancellation on pilot frequency 112 requires UE_B 102 knows the identifier (ID) of each cell service area 104, 106.

In the other two aspects, UE_B The control interference cancellation (CIC) component 126 of the 102 computing platform 110 performs interference cancellation on the control channel 114, which requires the UE_B 102 Know the user (for example, UE_A 108) MAC_ID 127.

In other respects, UE_B The traffic interference cancellation (TIC) component 128 of the computing platform 110 of 102 does not need to come from the interfering base station eNB_A In the case of the additional action of 106, interference cancellation is performed on the traffic channel 116. Traffic interference cancellation requires UE_B 102 knows the control information (ie, allocation and ACK) related to the interfering traffic 116. If as shown in the feedback before cancellation 132 (CQI and ACK), send the message to the base station eNB_B 104 provides some additional information about the interference link (downlink 122) and the cancellation performance itself, then from the base station eNB_B 104 to the UE performing interference cancellation_B 102's communication is more efficient.

Alternatively or additionally, such as eNB_B 104 and/or eNB_A Network entities such as 106 can be part of the cell service area interference cancellation framework 101, thereby improving UE_B 102 ability. In one aspect, the eNB_B The computing platform 134 of 104 may include a PIC element 136, a CIC element 138, and a TIC element 140 working as described below. In addition, the interfering eNB_A 106 can cooperate with interference mitigation by using pilot frequency power adjustment element 142, control channel power adjustment element 144, and traffic data rate adjustment element 146. This kind of cooperation is based on the related information (for example, CQI) sent on the backhaul network or radio link (RL) control channel 150._A, CQI_B, ACK_A, ACK_B) 148 responses.

In Figure 2, the interference mitigation UE (UE_B) 202 performs a UE-centric cell service area interference cancellation method or a series of operations 200, so as to communicate with the second UE in the presence of_A 208 strong interfering eNB for communication_A In the case of 206, the UE_B 202 Evolved Base Station (eNB_B) 204 for effective communication.

In one aspect, as shown at 210, the pilot frequency interference cancellation (PIC) is performed by the communication 200, where the pilot frequencies sent by the two eNBs 204, 206 overlap as shown at 212 and 214, respectively. The pilot frequencies sent by each eNB 204, 206 are specific to the cell service area, and they are determined by the eNB_ID (for example, cell service area ID, sector ID). For PIC 210, UE_B 202 obtains the eNB_IDs of the two eNBs, as shown in 216 and 218, respectively. UE_B 202 uses the received pilot frequency to estimate the channel of the stronger eNB, and eliminates the contribution of the eNB from the received pilot frequency sequence (block 220). Subsequently, at block 222, the UE_B 202 Use the second eNB_ID to estimate the second eNB_A 206 channel.

Alternatively or additionally, as shown in 222, network-centric pilot channel interference cancellation (PIC) improves UE_B 202 Eliminate the signal from the stronger eNB from the received signal_A The result of the efforts of the 208 pilot frequency, and subsequently, try to obtain the weaker eNB_B 204 transmitted signal. Specifically, the network-centric PIC scheme 222 enables eNB_A 206 can control the power of the pilot frequency so that the UE_B The UE-centric PIC 210 in 202 (e.g., femtocell service area) is more efficient (block 223). Generally speaking, this is particularly suitable for scenarios where a dedicated pilot frequency is used. Therefore, the final power increase has a limited impact on the entire system.

In another aspect, as shown at 224, controlled interference cancellation (CIC) is performed. At block 225, it is necessary to obtain the_A 206 Control information sent. UE_B 202 to an eNB_A The control channel of 206 is decoded (block 226), re-encoded (block 227), and eliminated from the received signal (block 228).

In an exemplary implementation for LTE, as shown in block 230, the target user UE is used_A 208 MAC_ID to control channel_AScramble it from the eNB_A 206 performs unicast transmission (block 232). In the case of LTE, MAC_ID can be referred to as the Cell Service Area Radio Network Temporary Identifier (c-RNTI). Therefore, it is advantageous to let the UE know the MAC_ID used to scramble the control channel, where the control channel: (a) Occupy and slave eNB_B 204 to UE_B The same PHY resources of the control channel of 202; (b) Carrying interference from eNB_B 204 traffic channel (from eNB_A 206 communications). It should be understood that situations (a) and (b) are not necessarily mutually exclusive. Can be used for scrambling control in the following ways_AThe MAC_ID is revealed to the UE_B 202: (i) As shown in 234, in the air, use PDCCH_A(Physical Downlink Control Channel), may use a specific coding scheme; or (b) as shown in 236, on the backhaul.

After knowing the MAC_ID, the UE can select a PDCCH decoding method that allows decoding of both PDCCHB and PDCCHA (as needed) (block 238). If CIC 224 is implemented, then the UE_B 202 first decodes the PDCCH received with a higher SINR (signal to interference plus noise ratio) (block 239).

In another aspect shown by 240, the network-centric control interference cancellation (CIC) process improves UE_B 202 capability to an eNB_A The control channel (PDCCH) of 206 is decoded, re-encoded, and eliminated from the received signal. Specifically, if the PDCCH_BIf the transmission is suitable for this situation, CIC can be performed more efficiently. Assumption and PDCCH_ACompared with the transmission rate, PDCCH_BThe transmission rate is lower (block 242). In this case, the eNB_B 204 can be selected for PDCCH_BEncoding scheme, which enables receiving PDCCH_AThe SINR of is maximized so that the channel can be better decoded and CIC can be better performed (block 244).

Alternatively or additionally, if PDCCH_AIf the transmission is suitable for this situation, CIC can be performed more efficiently. Assume that cell service area A is relatively large, and cell service area B is located in cell service area A (block 245). In this case, the eNB_A 206 may want to improve PDCCH_APower to enable the channel to be close to the eNB_B The UE of 204 decodes correctly. In addition, eNB_A 206 may selectively want to do this; in this case, the eNB_B 204 can send some relevant information (cell service area size and location, traffic distribution of its users) to the eNB on the backhaul_A 206 (Block 246) so that the eNB_A 206 Use this information to improve PDCCH_APower (block 248). As an alternative to or in addition to CIC, control orthogonalization can be used. In this case, the service cell service area and the control channel of the interference cell service area use different resources.

Continuing the method in Fig. 3, in other respects, UE-centric ("backward compatible") traffic interference cancellation (TIC) is described at 249, where it does not need to come from the eNB_A 206 or eNB_B In the case of any actions of 204 (power control, rate adjustment), the UE_B 202 can be used by the eNB as shown in 250_A 206 The sent traffic (interfering traffic) is decoded. In this example, the traffic power A is greater than the traffic power B. Can be obtained from the eNB_B The traffic of 204 is processed as noise (block 251) to complete the communication from the eNB as shown in the figure_A Decoding of 206 traffic. For example, if the eNB_A 206 The traffic sent is aimed at users located at the edge of the cells service area._B 202 receives at a higher power, then the above processing can be performed. UE_B 202 pairs with eNB_A The traffic-related control information sent by 206 is decoded (block 252).

As shown at 254, and will come from the eNB_A Compared with the SINR (Signal to Interference plus Noise Ratio) when the traffic of 206 is regarded as interference, it comes from the eNB_B After the elimination of 204 traffic, the SINR is significantly higher. In this case, it is useful to let the UE_B 202 to eNB_B 204 report: (1) At 256, (before TIC) CQI (channel quality index) of link A, marked as CQI_A; (1a) At 260, the ACK for traffic on link A is marked as DL ACK_A; (2) As shown in 264, the CQI of link B (after TIC) is marked as CQI_B. UE_B 202 Use CQI_AAnd ACK_ATo adjust the rate on link B (block 266). This adjustment can be done in the following two exemplary ways: (1) Ensure that the UE_B 202 can perform UE-centric TIC (block 268); or (2) adjust the transmission of link B traffic so that UE-centric TIC is not required first, and UE_B 202 can decode it (block 270).

In another aspect shown in 272, in some instances, network-centric traffic interference cancellation (TIC) can provide UE_B Additional SINR required for 202 so that it does not need to come from the eNB_A The additional help of 204 can be used for interfering traffic (from eNB_A 206 traffic) for decoding. In the UE-centric TIC process 272, the UE_B 202 and eNB_B 204 (mainly) needs to perform additional actions to correctly decode the traffic channel on link B 273. In an exemplary implementation, as shown in 274, the UE_B 202 to eNB_B 204 send CQI_A, ACK_A, ACK_BAnd CQI_B. UE_B 202 (for example, on the backhaul or using a radio link (RL) control channel) to the eNB_A 206 Send the same information (CQI_A, CQI_B, ACK_A, ACK_B) (Block 276). In one aspect, the eNB_B 204 and eNB_A 206 uses the backhaul/RL control channel to negotiate the rate (block 278). eNB_A 206 Adjust the rate of data transmitted on link A 256 so that the UE_B 202 may perform interference cancellation (block 280). The rate adjustment can be done in different ways. For example, if cell service area B is located in cell service area A, then the eNB_A 206 can schedule the following users on link A: (i) They are located at the edge of the cell service area (with lower geometric conditions), so their signals are received with higher power in the cell service area, which results in UE In the case of a central TIC (block 282); (ii) with a lower data rate (e.g., VoIP user) (block 284). Subsequently, the UE-centric TIC can be performed as described in 249 above. As shown in 285, the serving eNB changes its power to increase the SNR of the interfering eNB. In this way, the UE can better estimate the interfering link, which can then be eliminated. Subsequently, the UE obtains a better SINR from the service area of the serving cell.

In information theory, the scenario where a pair of users communicate with a pair of base stations is called an interference channel. In the previous scenario, when the traffic on link B does not really affect the UE_A When receiving 208, it will not be clearly considered that there is a UE that was originally scheduled to receive traffic on link A_A 208. However, in some instances, the presence of link B also affects the UE_AThe non-significant interferer situation that caused the interference (block 286). In this case, the rate adjustment (actually, rate reduction) on the interfering link mentioned above is based on the UE_A 208 for the price. eNB_A 206 and eNB_B 204 can negotiate a rate pair applicable to both link A and link B (R_A, R_B) (Block 288). An exemplary method is to achieve a large number of rate pairs by sharing resources between two different interference cancellation schemes (block 290). In an exemplary solution, the UE_A 208 pairs of signals received on link B (i.e. for UE_B 202) to cancel (block 292), and the UE_B 202 decodes the signal of link A as noise (block 294). In another exemplary solution, the UE_B 202 performs interference cancellation (block 296), and the UE_A 208 will come from eNB_B The signal of 204 is regarded as noise (block 298).

FIG. 4 depicts a wireless multiple access communication system 400 according to various aspects. For example, the wireless multiple access communication system 400 includes a plurality of base stations 410 and a plurality of terminals 420. In addition, one or more base stations 410 may communicate with one or more terminals 420. As a non-limiting example, the base station 410 may be an access point, a node B, and/or other appropriate network entities. Each base station 410 provides communication coverage for a specific geographic area 402a-c. The term "cell service area" used in this application and commonly used in the art may refer to the base station 410 and/or its coverage area 402a-c, depending on the context in which the term "cell service area" is used.

In order to increase the system capacity, the coverage area 402a, 402b, or 402c corresponding to the base station 410 may be divided into a plurality of smaller areas (for example, areas 404a, 404b, and 404c). Each of the smaller areas 404a, 404b, and 404c can be served by a respective base station transceiver subsystem (BTS, not shown). The term "sector" used in this application and commonly used in the art can refer to a BTS and/or its coverage area, depending on the context of the term "sector". For example, the sectors 404a, 404b, and 404c in the cell service areas 402a, 402b, and 402c may be formed by antenna groups (not shown) of the base station 410, where each group of antennas is responsible for communicating with the cell service areas 402a, 402b, and 402b. The terminal 420 in a part of 402c communicates. For example, the base station 410 serving the cell service area 402a may have a first antenna group corresponding to the sector 404a, a second antenna group corresponding to the sector 404b, and a third antenna corresponding to the sector 404c. Group. However, it should be understood that all aspects disclosed in this application can be used in systems with sectorized and/or non-sectorized cell service areas. In addition, it should also be understood that all appropriate wireless communication networks with any number of sectorized and/or non-sectorized cell service areas fall within the scope of protection of the attached patent application. For the sake of simplicity, the term "base station" used in this application can refer to a station serving a sector and a station serving a cell service area. It should be understood that, as used in this application, the downlink sector in the split link scenario is a neighboring sector. Although for simplicity, the following description is generally related to a system in which each terminal communicates with a service access point, but it should be understood that the terminal can communicate with any number of service access points.

According to one aspect, the terminals 420 may be dispersed in the system 400. Each terminal 420 may be stationary or mobile. As a non-limiting example, the terminal 420 may be an access terminal (AT), mobile station, user equipment, user station, and/or other appropriate network entities. The terminal 420 may be a wireless device, a cellular phone, a personal digital assistant (PDA), a wireless modem, a handheld device, or other suitable devices. In addition, the terminal 420 can communicate with any number of base stations 410 or not with any base station 410 at any given moment.

For another example, the system 400 may use a centralized architecture by using the system controller 430, where the system controller 430 may be coupled to one or more base stations 410, and coordinate and control these base stations 410. According to alternative aspects, the system controller 430 may be a single network entity or a collection of network entities. In addition, the system 400 can use a decentralized architecture to allow base stations 410 to communicate with each other as needed. The backhaul network communication 434 can facilitate point-to-point communication between base stations using this distributed architecture. For example, the system controller 430 may additionally include one or more connections to multiple networks. These networks may include the Internet, other packet-based networks, and/or circuit-switched voice networks. These networks can provide/from a terminal 420 that communicates with one or more base stations 410 in the system 400. Get information. For another example, the system controller 430 may include or be coupled to a scheduler (not shown), where the scheduler can schedule transmissions to and/or from the terminal 420. Of course, the scheduler can also be located in each individual cell service area 402, each sector 404, or a combination thereof.

For example, the system 400 may use one or more multiple access schemes, such as CDMA, TDMA, FDMA, OFDMA, single carrier FDMA (SC-FDMA), and/or other suitable multiple access schemes. TDMA uses time division multiplexing (TDM), in which transmissions of different terminals 420 are orthogonalized by transmitting at different time intervals. FDMA uses frequency division multiplexing (FDM), in which transmissions of different terminals 420 are orthogonalized by transmitting on different frequency subcarriers. For example, TDMA and FDMA systems can also use code division multiplexing (CDM). In CDM, even if the transmissions for multiple terminals are sent in the same time interval or frequency subcarrier, different orthogonality can be used. Encoding (e.g., Walsh encoding) to orthogonalize these transmissions. OFDMA uses Orthogonal Frequency Division Multiplexing (OFDM), and SC-FDMA uses Single Carrier Frequency Division Multiplexing (SC-FDM). OFDM and SC-FDM can divide the system bandwidth into multiple orthogonal sub-carriers (for example, tone, frequency, ...), each of which can be modulated with data. Generally, OFDM is used to send modulation symbols in the frequency domain, and SC-FDM is used to send modulation symbols in the time domain. Additionally and/or alternatively, the system bandwidth may be divided into one or more frequency carriers, and each frequency carrier may include one or more sub-carriers. The system 400 may also use a combination of multiple access schemes such as OFDMA and CDMA. Although the power control technology given in this application is generally described for OFDMA systems, it should be understood that the technology described in this application can also be applied to any wireless communication system.

For another example, the base station 410 and the terminal 420 in the system 400 may use one or more data channels to transmit data, and one or more control channels to transmit signals. The data channels used by the system 400 can be allocated to the mobile terminals 420 so that each data channel is used by only one terminal at any given time. Alternatively, data channels may be allocated to a plurality of terminals 420, and these terminals 420 may be superimposed on one data channel or scheduled orthogonally. In order to save system resources, it is also possible to use, for example, code division multiplexing to share the control channel used by the system 400 among multiple terminals 420. For example, due to channel conditions and non-idealities of the receiver, data channels that are only orthogonally multiplexed in frequency and time (for example, data channels that do not use CDM for multiplexing) are compared with the corresponding control channels. Can be less affected by the loss of orthogonality.

In Figure 5, the serving radio access network (RAN) depicted as an evolved base node (eNB) 500 has a computing platform 502 that provides components such as a code set that causes a computer to perform the following operations: serving as a base station or Interfere with the base station to promote interference cancellation in the wireless cell service area. Specifically, the computing platform 502 includes a computer-readable storage medium (for example, a memory) 504, which stores a plurality of modules 506-510 executed by the processor 520. The modulator 522 controlled by the processor 520 generates a downlink signal for modulation by the transmitter 524 and transmission by the antenna 526. The receiver 528 receives the uplink signal from the antenna 526, and the signal is demodulated by the demodulator 530 and provided to the processor 520 for decoding. Specifically, a component (e.g., module, code set) 506 is provided, which is used to transmit a first link coded with a first identifier to the served UE, where the served UE also receives information from the interfering base station. Receive an interfering second link coded with a second identifier. A component (for example, a module, a code set) 508 is provided for transmitting a second identifier to the UE and receiving feedback from the UE, where the feedback indicates that the first signal is eliminated from the signal received by the UE. Capability of one of the first link and the second link. A component (e.g., module, code set) 510 is provided to respond to the feedback and adjust the transmission so that the signal to interference plus noise ratio (SINR) of one of the first link and the second link ) Has undergone a relative change. Therefore, the UE is improved when canceling the second link received with a higher SINR in the following manner: using the second identifier to decode the second link; using the second identifier to reconstruct the second link Encoding; eliminating the second link from the received signal; decoding the first link from the received signal through channel estimation. Advantageously, the transmit (Tx) power element 532 can adjust the transmit power. The received signal indicator (RSI) 534 can measure the signal strength.

Continuing to refer to FIG. 5, a mobile station or user equipment (UE) 550 has a computing platform 552, which provides components such as a code set that causes a computer to perform interference cancellation in a wireless cell service area. Specifically, the computing platform 552 includes a computer-readable storage medium (for example, a memory) 554, which stores a plurality of modules 556-560 executed by the processor 570. The modulator 572 controlled by the processor 570 generates an uplink signal for modulation by the transmitter 574 and transmitted by the antenna 576 to the eNB 500 (as shown in 577). The receiver 576 receives the downlink signal from the eNB 500 from the antenna 576, and the signal is demodulated by the demodulator 560 and provided to the processor 570 for decoding. Specifically, the component (e.g., module, code set) 556 accesses the first identifier used by the serving base station to encode the first link. The component (e.g., module, code set) 557 accesses the second identifier used by the interfering base station to encode the second link. The component (e.g., module, code set) 558 receives the signal including the first link and the second link. The component (e.g., module, code set) 559 eliminates the second link: uses the corresponding identifier to estimate the second link, and eliminates the second link from the received signal. The component (e.g., module, code set) 560 decodes the first link from the received signal through channel estimation.

See FIG. 6, which depicts a system 600 that performs interference cancellation in a wireless cell service area. For example, the system 600 may be located at least partially in a user equipment (UE). It should be understood that the system 600 is represented as including some functional blocks, and these functional blocks represent functions implemented by a computing platform, a processor, software, or a combination thereof (for example, firmware). System 600 includes a logical grouping 602 of electronic components that act in conjunction. For example, the logical group 602 may include: an electronic component 604 for accessing the first identifier used by the serving base station to encode the first link. In addition, the logical group 602 may further include: an electronic component 606 for accessing the second identifier used by the interfering base station to encode the second link. In addition, the logical group 602 may further include: an electronic component 608 for receiving a signal including the first link and the second link. The logical group 602 may further include: a second link elimination electronic component 610, which uses the corresponding identifier to estimate the second link, and eliminates the second link from the received signal. The logical group 602 may also include an electronic component 612 for decoding the first link from the received signal through channel estimation. In addition, the system 600 may also include a memory 614, which stores instructions for performing functions related to the electronic components 604-612. Although the electronic components 604-612 are shown as being located outside the memory 614 in the figure, it should be understood that one or more of the electronic components 604-612 may be located inside the memory 614.

See FIG. 7, which depicts a system 700 for improving interference cancellation in the service area of a wireless cell. For example, the system 700 may be located at least partially in a base station. It should be understood that the system 700 is represented as including some functional blocks, and these functional blocks represent functions implemented by a computing platform, a processor, software, or a combination thereof (for example, firmware). System 700 includes a logical grouping 702 of electronic components that work in conjunction. For example, the logical group 702 may include: an electronic component 704 for transmitting a first link encoded with a first identifier to a UE, wherein the UE also receives an interference encoded with a second identifier from an interfering base station The second link. In addition, the logical group 702 may further include: an electronic component 706 for transmitting a second identifier to the UE and receiving feedback from the UE, wherein the feedback indicates that the UE eliminates the first link and the signal from the received signal. The capability of one of the second links. In addition, the logical group 702 may further include: an electronic component 708 for responding to the feedback and adjusting the transmission so that the signal to interference plus noise ratio (SINR) of one of the first link and the second link ) A relative change occurs, where the UE eliminates the second link received with a higher SINR by using the second identifier to decode the second link, and using the second identifier to re-encode the second link, from The second link is eliminated from the received signal, and the first link is decoded from the received signal through channel estimation. In addition, the system 700 may also include a memory 714, which stores instructions for executing functions related to the electronic components 704-708. Although the electronic components 704-708 are shown as being located outside the memory 714, it should be understood that one or more of the electronic components 704-708 may be located inside the memory 714.

In FIG. 8, the present application provides an apparatus 802 for interference cancellation in a wireless cell service area. The component 804 is used to access the first identifier used by the serving base station to encode the first link. The component 806 is used to access the second identifier used by the interfering base station to encode the second link. The component 808 is used to receive a signal including the first link and the second link. The component 810 is used to estimate the second link by using the corresponding identifier and eliminate the second link from the received signal to eliminate the second link. The component 812 is used to decode the first link from the received signal through channel estimation.

In FIG. 9, the present application provides a network device 902 for promoting interference cancellation in a wireless cell service area. The component 904 is used to transmit a first link encoded with a first identifier to a node, wherein the node also receives an interfering second link encoded with a second identifier from an interfering base station. The component 906 is used to receive feedback from the node, where the feedback represents the ability of the node to eliminate one of the first link and the second link from the received signal. The component 908 is used to respond to the feedback and adjust the transmission so that the signal-to-interference plus noise ratio (SINR) of one of the first link and the second link has a relative change, wherein the node is eliminated by the following method The second link received with a higher SINR: Use the second identifier to decode the second link, use the second identifier to re-encode the second link, eliminate the second link from the received signal, and pass The channel estimation decodes the first link from the received signal.

In FIG. 10, the present application provides an apparatus 1002 that helps non-served UEs to achieve interference cancellation in a wireless cell service interval. The component 1004 is used to: when the serving base station transmits the first link encoded with the first identifier to the non-serviceable node, transmit the second link of interference encoded with the second identifier. The component 1006 is used to receive a communication message from the serving base station, the communication message indicating that the non-serviceable node needs to perform interference cancellation on the interfering second link. The component 1008 is used to directly or indirectly transmit the second identifier to the UE not receiving the service. The component 1010 is used to adjust the transmission of the interfering second link, so as to facilitate interference cancellation by non-served nodes.

Although the specification describes specific examples of the present invention, those skilled in the art can design variations of the present invention without departing from the concept of the present invention. For example, the content of this application is directed to a circuit switched network unit, but it can be equally applied to a packet switched domain network unit.

Referring to Figure 11, this figure depicts a system 1100 for improving interference cancellation in the service area of a wireless cell. For example, the system 1100 may be located at least partially in a base station. It should be understood that the system 1100 is represented as including some functional blocks, and these functional blocks represent functions implemented by a computing platform, a processor, software, or a combination thereof (for example, firmware). System 1100 includes a logical grouping 1102 of electronic components that act in conjunction. For example, the logical group 1102 may include: an electronic component 1104 for transmitting the interference coded with the second identifier when the serving base station transmits the first link coded with the first identifier to the unserved UE The second link. In addition, the logical group 1102 may further include: an electronic component 1106 for receiving a communication message from the serving base station, the communication message indicating that the unserved UE needs to perform interference cancellation on the interfering second link. In addition, the logical group 1102 may further include: an electronic component 1108, configured to directly or indirectly transmit the second identifier to the unserved UE. In addition, the logical group 1102 may further include: an electronic component 1110 for adjusting the transmission of the second link of interference, so as to facilitate interference cancellation by the unserved UE. In addition, the system 1100 may also include a memory 1114, which stores instructions for executing functions related to the electronic components 1104-1110. Although the electronic components 1104-1110 are shown as being located outside the memory 1114 in the figure, it should be understood that one or more of the electronic components 1104-1110 may be located within the memory 1114.

From the above description, it should be understood that, in one aspect, a UE that is receiving interference can benefit from receiving an identifier that encodes the interference. Preferably, the reception of identifiers such as MAC ID or c-RNTI is tunneled from the interfering base station to the serving base station and then to the UE. The transmission can be prompted by a request initiated by the UE or the serving base station.

On the other hand, it can support the pilot channel interference cancellation for OFDMA system. For example, the UE may cancel the reference signal, or use different interference estimates for the resource unit including the canceled reference signal (RS).

In other respects, it can support control interference cancellation. For example, the UE may decode the PDCCH of the interfering sector based on the received c-RNTI. In addition, the UE can eliminate the PDCCH after decoding it.

In another aspect, cell service interval interference cancellation (ICIC) can be performed based on the decoded PDCCH allocation.

In another aspect, traffic interference cancellation can be supported in situations such as: (1) restricted association, (2) distance expansion (lower geometry cell service area), and (3) separate link. For example, the UE can perform ICIC in every situation. As another example, the serving base station can determine the SINR after cancellation directly or by receiving information from the UE, and determine that the UE can be handed over to the interfering base station.

In another aspect, CQI based on SINR after cancellation can be supported. According to the eliminated SINR, the UE feeds back the CQI. In some instances, the UE also feeds the pre-cancellation CQI. The scheduling of the serving eNB may be based on ICIC after elimination. In another example, when HARQ fails, the CQI before cancellation is provided.

In another aspect, the feedback of the control channel is supported. The UE feeds back the CQI/ACK corresponding to the interfering sector. The serving base station tunnels the CQI/ACK to the interfering base station. The interfering base station receives CQI/ACK feedback directly or on the backhaul connection. For example, CQI/ACK can be about data. For another example, CQI/ACK may be related to PDCCH. For another example, CQI/ACK may be related to a reference signal (RS). The serving base station may (e.g., according to feedback) change (e.g., reduce) its power in order to help its UE in ICIC. The interfering base station may (e.g., according to feedback) change (e.g., increase) its power in order to help non-served neighboring UEs.

In another aspect, the interfering base station can control the rate to achieve ICIC. In one example, such rate control can be related to PDCCH. In another aspect, rate control can be related to PDSCH. The UE can provide feedback, and then perform ICIC. (For example, based on feedback), the interfering base station provides a rate that enables unserved UEs to decode.

For example, some nodes may be used to implement the exemplary aspects described above, and these nodes may interchangeably act as transmitting nodes in one instance and then acting as interfering nodes in another instance. In addition, fairness corresponding to the receiving capability of the node can be given, so as to smoothly respond to the request to reduce the transmission power. Of course, it can also be specified that a node only serves as a selected one of the transmitting node and the interfering node.

Those skilled in the art should understand that information and signals can be represented using any of a variety of different technologies and methods. For example, the data, instructions, commands, information, signals, bits, symbols, and chips mentioned throughout the above description can be represented by voltage, current, electromagnetic waves, magnetic fields or particles, light fields or particles, or any combination thereof .

Those skilled in the art should also understand that the various exemplary logic blocks, modules, circuits, methods, and algorithms described in conjunction with the examples disclosed in this application can all be implemented as electronic hardware, computer software, or a combination of both. In order to clearly show the interchangeability between hardware and software, various exemplary components, blocks, modules, circuits, methods, and algorithms are described above in general around their functions. As for whether this function is implemented as hardware or software, it depends on the specific application and the design constraints imposed on the entire system. Skilled artisans can implement the described functions in a flexible manner for each specific application, but this implementation decision should not be interpreted as a departure from the protection scope of the present invention.

As used in this application, the terms "component", "module", "system", etc. are intended to include computer-related entities, such as, but not limited to: hardware, firmware, a combination of hardware and software, Software or running software. For example, the element can be, but is not limited to: a process running on a processor, a processor, an object, an executable file, an executing thread, a program, and/or a computer. As an example, both the application running on the computing device and the computing device may be elements. One or more components may exist in processing and/or execution threads, and the components may be located in one computer and/or distributed between two or more computers. In addition, these components can be executed from various computer-readable media having various data structures thereon. These components can be based on, for example, a signal having one or more data packets (for example, data from a component that interacts with another component in a local system, a distributed system, and/or through a signal such as the Internet A network such as a network interacts with other systems), and communicates by means of local and/or remote processing.

In addition, this application describes various aspects in conjunction with a terminal, where the terminal may be a wired terminal or a wireless terminal. A terminal can also be called a system, equipment, user unit, user station, mobile station, mobile station, mobile device, remote station, remote terminal, access terminal, user terminal, terminal, communication device, user agent, user equipment or User Equipment (UE). Wireless terminals can be cellular phones, satellite phones, wireless phones, dialogue initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDAs), handheld devices with wireless connection capabilities, computing devices, or connected to Other processing equipment for wireless modems. In addition, this application describes various aspects in conjunction with base stations. The base station can be used to communicate with wireless terminals. The base station is also called an access point, node B, or some other terminology.

In addition, the term "or" means an inclusive "or" rather than an exclusive "or". That is, unless otherwise stated or clearly known from the context, the phrase "X uses A or B" means any normal or permutation. That is, any of the following examples satisfy the phrase "X uses A or B": X uses A; X uses B; or X uses A and B. In addition, the articles "a" and "a" used in the patent scope of this application and the appended applications should generally be interpreted as meaning "one or more" unless specifically stated or clearly known from the context that they are directed to the singular form.

The technology described in this application can be used in various wireless communication systems, such as CDMA, TDMA, FDMA, OFDMA, SC-FDMA, and other systems. The terms "system" and "network" are often used interchangeably. The CDMA system can implement wireless technologies such as Universal Terrestrial Radio Access (UTRA), CDMA 2000, and so on. UTRA includes wideband CDMA (W-CDMA) and other variants of CDMA. In addition, CDMA 2000 covers IS-2000, IS-95 and IS-856 standards. The TDMA system can implement wireless technologies such as the Global System for Mobile Communications (GSM). The OFDMA system can implement wireless technologies such as Evolved UTRA (E-UTRA), Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, flash OFDM, etc. UTRA and E-UTRA are part of the Universal Mobile Telecommunications System (UMTS). 3GPP Long Term Evolution (LTE) is a release version of UMTS that uses E-UTRA, where E-UTRA uses OFDMA on the downlink and SC-FDMA on the uplink. In the name from the "3rd Generation Partnership "Project" (3GPP) organization documents describe UTRA, E-UTRA, UMTS, LTE and GSM. In addition, CDMA 2000 and UMB are described in documents from an organization named "3rd Generation Partnership Project 2" (3GPP2). In addition, these wireless communication systems can also include peer-to-peer (for example, mobile station to mobile station) ad hoc network systems, which usually use unpaired unlicensed spectrum, 802.xx wireless LAN, Bluetooth, and any other short-range or long-range wireless Communication Technology.

This application presents various aspects or features around a system including multiple devices, components, modules, etc. It should be understood and understood that various systems may include other devices, elements, modules, etc. and/or may not include all the devices, elements, modules, etc. discussed in conjunction with the accompanying drawings. A combination of these approaches can also be used.

General-purpose processors, digital signal processors (DSP), special integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, individual gates or transistor logic used to perform the functions described in this application Devices, individual hardware components, or any combination thereof, can implement or execute various exemplary logics, logic block diagrams, modules, and circuits described in conjunction with the embodiments disclosed in the present application. The general-purpose processor may be a microprocessor, or the processor may also be any conventional processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, multiple microprocessors, a combination of one or more microprocessors and a DSP core, or any other such structure. In addition, at least one processor includes one or more modules that can be used to perform one or more steps and/or actions described above.

In addition, the steps and/or actions of the method or algorithm described in connection with the aspects disclosed in the present application can be directly embodied as hardware, a software module executed by a processor, or a combination of the two. The software module can be located in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, scratchpad, hard disk, removable disk, CD-ROM or any other known in the art Form of storage media. An example storage medium can be coupled to the processor so that the processor can read information from the storage medium and can write information to the storage medium. Alternatively, the storage medium may also be an integral part of the processor. In addition, in some aspects, the processor and storage medium may be located in an ASIC. In addition, the ASIC may be located in the user terminal. Of course, the processor and the storage medium may also exist as individual components in the user terminal. In addition, in some aspects, the steps and/or actions of a method or algorithm may be located on a machine-readable medium and/or a computer-readable medium as one or any combination of code and/or instruction sets, and the machine may Readable media and/or computer-readable media can be incorporated into computer program products.

In one or more aspects, the functions described in this application can be implemented by hardware, software, firmware, or any combination thereof. When implemented by software, these functions can be stored as one or more instructions or codes in a computer readable medium or transmitted as one or more instructions or codes on a computer readable medium. Computer readable media include computer storage media and communication media, where communication media includes any media that facilitates the transfer of computer programs from one place to another. The storage medium can be any available medium that the computer can access. By way of example and not limitation, such computer-readable media may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, floppy disk storage media or other magnetic disk storage devices, or can be used for carrying or Any other medium that stores program codes in the form of desired commands or data structures and can be accessed by a computer. In addition, any connection is properly terminated with computer readable media. For example, if the software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, wireless, and microwave, then the coaxial cable , Fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, wireless, and microwave are included in the definition of the media. As used in this application, discs and discs include compact discs (CDs), laser discs, optical discs, digital versatile discs (DVD), floppy discs and Blu-ray discs. Disks usually copy data magnetically, and discs ( disc) uses lasers to optically reproduce data. The above combination should also be included in the protection scope of computer readable media.

Although the above invention discusses exemplary aspects and/or embodiments, it should be noted that, without departing from the scope of protection of the embodiments and/or described aspects as specified in the scope of the appended application, the present invention can be Apply for various changes and modifications. In addition, although the unit of the described aspect and/or embodiment is described or claimed in a singular form, unless it is clearly stated that it is limited to the singular, a plural form is contemplated. In addition, unless otherwise specified, all parts or parts of any aspect and/or embodiment may be used with all parts or parts of any other aspect and/or embodiment.

<p>150. . . Backhaul network/radio link (RL) control channel</p><p>104. . . Base Station (eNBB)</p><p>130. . . Allocation/ACK</p><p>124. . . Disruptor identification information</p><p>102. . . User Equipment (UEB)</p><p>106. . . Interference Base Station (eNBA)</p><p>142. . . Pilot frequency power adjustment</p><p>144. . . Control power adjustment</p><p>146. . . Data rate adjustment</p><p>112. . . Pilot frequency</p><p>122. . . Interfering downlink</p><p>114. . . control</p><p>116. . . Communication</p><p>108. . . UEA communicating with the interfering BS</p><p>134. . . Network-centric cell service area interference cancellation computing platform</p><p>136. . . Pilot frequency interference cancellation (PIC)</p><p>138. . . Controlled Interference Cancellation (CIC)</p><p>140. . . Traffic interference cancellation (TIC)</p><p>110. . . UE-centered cell service area interference cancellation computing platform</p><p>118. . . Pilot frequency interference cancellation (PIC)</p><p>126. . . Controlled Interference Cancellation (CIC)</p><p>128. . . Traffic interference cancellation (TIC)</p><p>202. . . Interference Mitigation User Equipment (UEB)</p><p>204. . . Interference mitigation base station/eNBB</p><p>206. . . Interference source base station/eNBA</p><p>208. . . Interfering User Equipment (UEA)</p><p>210. . . UE-centric pilot frequency interference cancellation (PIC)</p><p>214. . . Boot frequency A (cell service area ID, sector ID</p><p>212. . . Boot frequency B (cell service area ID, sector ID)</p><p>216. . . eNBA_ID (cell service area ID, sector ID)</p><p>218. . . eNBB_ID (cell service area ID, sector ID)</p><p>220. . . Estimated channel-eliminate eNBA contribution</p><p>223. . . Adjust the pilot frequency power</p><p>222. . . Network-centric pilot frequency interference cancellation (PIC)</p><p>230. . . Use MAC_ID to scramble control channel A</p><p>240. . . Network-centric control interference elimination</p><p>242. . . Data rate PDDCH B&lt;Data rate PDDCH A</p><p>244. . . Encoding to improve SINR/maximize PDDCH A</p><p>245. . . Cell service area A is larger and contains cell service area B</p><p>246. . . Cell service area size and location, traffic distribution, etc.</p><p>248. . . Responding to eNBB to increase the power of PDDCH A</p><p>224. . . UE-centric control interference cancellation (CIC)</p><p>234. . . MAC_ID via PDDCH A</p><p>236. . . MAC_ID via the backhaul network</p><p>232. . . Unicast scrambled control channel</p><p>225. . . Get eNBA control information</p><p>226. . . Decoding eNBA control channel</p><p>238. . . Select PDCCH A and B decoding</p><p>239. . . Decode the higher SINR first</p><p>227. . . Recode the eNBA control channel</p><p>228. . . Eliminate eNBA control channels</p><p>249. . . UE-centric traffic interference cancellation (TIC)</p><p>250. . . Link A traffic</p><p>251. . . Treat traffic B as noise</p><p>252. . . Decoding traffic A</p><p>256. . . Pre-TIC CQI of Link A</p><p>260. . . Downlink ACK A</p><p>264. . . CQI of link B</p><p>266. . . Adjust the data rate on link B</p><p>268. . . The rate first supports decoding A, SINR A&gt;SINR B</p><p>270. . . The rate first supports decoding B, SINR A&lt;SINR B</p><p>272. . . Network-centric traffic interference cancellation (TIC)</p><p>273. . . Link B traffic</p><p>274. . . CQIA, ACKA, ACKB and CQIB</p><p>276. . . CQIA, ACKA, ACKB and CQIB</p><p>278. . . Negotiate the rate of link A</p><p>280. . . Adjust the data rate on link A</p><p>282. . . Increase rate&gt;SINR</p><p>284. . . Reduce rate&lt;SINR</p><p>285. . . Power changes increase the SNR of interfering eNBs</p><p>286. . . Non-significant interference scenarios</p><p>288. . . Negotiate the rate of links A and B</p><p>290. . . Large number of rate pairs</p><p>292. . . UEA eliminates link B signal</p><p>294. . . UEB decodes link B and treats link A as noise</p><p>296. . . UEB eliminates link A signal</p><p>298. . . UEA decodes link A and treats link B as noise</p><p>430. . . System controller</p><p>500. . . Base station</p><p>502. . . Computing platform</p><p>504. . . Computer readable storage media (memory)</p><p>506. . . A component (module, code) for transmitting the first link coded with the first ID to the UE, wherein the UE also receives the second link coded with the second ID from the interfering base station</p><p>508. . . A means (module, code) for transmitting a second ID to the UE and receiving feedback from the UE, where the feedback means that the UE eliminates the first link and the second link from the received signal One of the ability</p><p>510. . . A component (module, code) used to respond to the feedback and adjust the transmission so that the SINR of one of the first link and the second link changes relatively</p><p>520. . . processor</p><p>524. . . transmitter</p><p>522. . . Modulator</p><p>530. . . Demodulator</p><p>528. . . Receiver</p><p>532. . . Transmit power</p><p>526. . . antenna</p><p>534. . . Receive RSI</p><p>576. . . antenna</p><p>574. . . transmitter</p><p>572. . . Modulator</p><p>580. . . Demodulator</p><p>578. . . Receiver</p><p>570. . . processor</p><p>554. . . Computer readable storage media (memory)</p><p>556. . . A component (module, code) used to access the first ID used by the service base station to encode the first link</p><p>557. . . A component (module, code) used to access the second ID used by the interfering base station to encode the second link</p><p>558. . . A component (module, code) for receiving signals including the first link and the second link</p><p>559. . . A component (module, code) used to eliminate the second link by using the corresponding identifier to estimate the second link and eliminate the second link from the received signal</p><p>560. . . The component (module, code) used to decode the first link from the received signal through channel estimation</p><p>552. . . Computing platform</p><p>550. . . Mobile station (e.g. user equipment (UE))</p><p>602. . . Logical group</p><p>604. . . Electronic component for accessing the first identifier used by the service base station to encode the first link</p><p>606. . . Electronic component for accessing the second identifier used by the interfering base station to encode the second link</p><p>608. . . Electronic assembly for receiving signals including a first link and a second link</p><p>610. . . Electronic component used to estimate the second link by using the corresponding identifier and eliminate the second link from the received signal to eliminate the second link</p><p>612. . . Electronic components for decoding the first link from the received signal through channel estimation</p><p>614. . . Memory</p><p>702. . . Logical group</p><p>704. . . An electronic component for transmitting a first link coded with a first identifier to a UE, wherein the UE also receives an interfering second link coded with a second identifier from the interfering base station</p><p>706. . . An electronic component for transmitting a second identifier to the UE and receiving feedback from the UE, wherein the feedback represents the ability of the UE to eliminate one of the first link and the second link from the received signal</p><p>708. . . An electronic component used to respond to the feedback and adjust the transmission so that the signal to interference plus noise ratio (SINR) of one of the first link and the second link relatively changes</p><p>714. . . Memory</p><p>802. . . Device</p><p>804. . . Means for accessing the first identifier used by the service base station to encode the first link</p><p>806. . . Means for accessing the second identifier used by the interfering base station to encode the second link</p><p>808. . . Means for receiving a signal including a first link and a second link</p><p>810. . . A component used to eliminate the second link by using the corresponding identifier to estimate the second link and eliminate the second link from the received signal</p><p>812. . . Means for decoding the first link from the received signal through channel estimation</p><p>902. . . Device</p><p>904. . . A module for transmitting a first link coded with a first identifier to a UE, wherein the UE also receives an interfering second link coded with a second identifier from the interfering base station</p><p>906. . . A means for transmitting a second identifier to the UE and receiving feedback from the node, wherein the feedback represents the ability of the UE to eliminate one of the first link and the second link from the received signal</p><p>908. . . A component used to respond to the feedback and adjust the transmission so that the signal to interference plus noise ratio (SINR) of one of the first link and the second link changes relatively</p><p>1002. . . Device</p><p>1004. . . When the serving base station transmits the first link coded with the first identifier to the unserved UE, it transmits the second link of the interference coded with the second identifier</p><p>1006. . . A component for receiving a communication message from a serving base station, the communication message indicating that a non-served UE needs to perform interference cancellation on the interfering second link</p><p>1008. . . Means for directly or indirectly transmitting the second identifier to the UE not receiving service</p><p>1010. . . A component used to adjust the transmission of the second link of interference to facilitate interference cancellation by non-served UEs</p><p>1102. . . Logical group</p><p>1104. . . Electronic component for transmitting the second link of the interference coded with the second identifier when the serving base station transmits the first link coded with the first identifier to the UE not receiving service</p><p>1106. . . An electronic component for receiving a communication message from a serving base station, the communication message indicating that a non-served UE needs to perform interference cancellation on the interfering second link</p><p>1108. . . Electronic component for directly or indirectly transmitting a second identifier to a UE not receiving service</p><p>1110. . . Electronic component for adjusting the transmission of the second link of interference to facilitate interference cancellation by non-served UEs</p><p>1114. . . Memory</p>

Through the detailed description given below in conjunction with the accompanying drawings, the features, essence and advantages of the present invention will become more apparent. In all the accompanying drawings, the same reference numerals denote the same components, among which:

Figure 1 depicts a block diagram of a wireless communication system in which a user equipment (UE) communicates with a base station in the presence of an interfering base station.

Figure 2-3 depicts a time chart of a method or a series of operations used to perform integrated elimination of pilot frequency, control, and traffic.

Figure 4 depicts a block diagram of a communication system in which user equipment (UE) communicates with their respective base stations and is affected by interference from other base stations.

Fig. 5 depicts a block diagram of a base station and a serviced user equipment (UE), both of which have a computing platform to perform a method for wireless interference cancellation.

Figure 6 depicts a block diagram of a system with a logical grouping of electronic components for performing wireless interference cancellation.

Figure 7 depicts a block diagram of a system with a logical grouping of electronic components for improving the performance of wireless interference cancellation.

Fig. 8 depicts a block diagram of an apparatus having components for interference cancellation in a wireless cell service area.

Fig. 9 depicts a block diagram of a device with a means for facilitating the elimination of interference in the cell service area by the network.

FIG. 10 depicts a block diagram of an apparatus having a component used by the network to facilitate interference cancellation in a cell service area at a non-served UE.

Figure 11 depicts a block diagram of a system with a logical grouping of electronic components for improving wireless interference cancellation performance at unserved UEs.