巴西专利BR112014013065A2 efficient spectrum use with near blank subframes

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  EFFICIENT SPECTRUM USE WITH SUBQUADS ALMOST WHITESystems and methods for providing efficient use of spectrum in a cellular communication network that apply Almost Blank Subframes (ABSs) are revealed. In general, the network includes an access node that applies ABSs to the downlink. In one embodiment, the access node identifies UEs for which transmissions must be scheduled for the uplink using a scheduling scheme that does not require control information for each subframe. The access node then aligns the scaling instants of the UEs and subframes in the uplink that correspond to at least some of the ABSs in the downlink in time. In another modality, the access node identifies UEs for which transmissions must be scheduled for the downlink using a scheduling scheme that does not require control information for each subframe. The access node then aligns time staggering UEs for the downlink and at least a subset of the ABSs in the downlink.
公开号:BR112014013065A2
申请号:R112014013065-5
申请日:2012-11-29
公开日:2020-10-27
发明作者:Jawad Manssour；Konstantinos Dimou
申请人:Telefonaktiebolaget L M Ericsson (Publ)；
IPC主号:

专利说明:

[0001] [0001] The present description refers to a cellular communication network which and more particularly refers to the use of efficient spectrum when applying Subframes Almost Blank in the downlink from an access node (for example, a macro closed subscriber group (CSG) node or femto node in a heterogeneous cellular communication network. Fundamentals of the Invention
[0002] [0002] The implementation of heterogeneous cellular communication networks, which are called here Heterogeneous Networks (HetNets), is widely seen as one of the most cost efficient solutions to reach the constantly increasing demand for higher data rates in future generations of cellular systems. Such implementations include several Low Power Nodes (LPNs) of different nature (for example, eNode Bs micro, pico, and femto in the case of Long Term Evolution (LTE)). These LPNs transform a homogeneous cellular communication network architecture into a fragmented multilayer architecture.
[0003] [0003] HetNets are resistant to deformations in the signal power normally resulting from the increase in distance from the transmission point and are well known for defying the inverse law of the distance frame by moving the base stations (BSs) (ie ie, macro nodes and LPNs) closer to user equipment devices (UEs) and providing similar Quality of Service (QoS) throughout the cell area. Thus, HetNet implementations have an inherent capacity to encompass the limitations implied by the channel capacity and provide a uniform user experience throughout the cell area regardless of the user's location. The potential of HetNets to provide gains in coverage and capacity is widely known. The main advantages or benefits can be summarized as: - Moving the BSs closer to the UEs results in better radio link conditions, which in turn leads to higher data rates for the UEs connected to the LPNs .
[0004] [0004] However, even though there are significant advantages brought about by HetNet architectures, there are a number of concerns to be addressed. For example, the high number of parameters associated with LPNs, for example, Transmission Power restrictions, access rights, and point-to-point connection capabilities, has a direct impact on system performance and makes selection of LPN and supported features a highly complicated task. The decision depends mainly on the objective to be achieved with the addition of LPNs (for example, improvement in capacity versus data rate, or both).
[0005] [0005] The coexistence of cells with different levels of Power in HetNets has several implications for system procedures and mobility. In a macro-only implementation, the cell selection process for UEs is generally based on the Received Power from the Reference Signal (RSRP), otherwise known as the Received Signal Strength (RSS). This means that the UEs are coupled to the cell from which they obtain the strongest RSS. However, employing this procedure for HetNets can intensify the interference scenarios in the uplink and can also lead to situations of load imbalance where most UEs are connected to macro cells while LPN cells are underutilized. In LTE, the power difference between macro and femto cells is approximately 23 decibel-milliwatts (dBm). This means that UEs that have the least loss of path to the LPN cell still receive high RSRP from the macro node and are then connected to the macro node instead of the LPN. This causes high interference in the uplink, which results in an uneven distribution of the UEs in the macro cell and LPN layer.
[0006] [0006] The load imbalance problem mentioned earlier has been a topic of several research. A proposed solution is a “Range Extension” concept, which provides a simulated expansion in the LPN range when making a decision regarding the association of the UE with the LPN. This means that whenever an UE is associating with an LPN, an artificial displacement limit is added to the actual RSRP value to be used for the cell association decision. In contrast, in the case of a macro node, association decisions are based on the actual received signal strength in most cases. The Range Extension (RE) concept enables an optimal association of users across the coverage area, which leads to improved system performance and reduced load from the macro cell at the same time.
[0007] [0007] The disadvantage of the range extension is that UEs located in the extended range of small cells and connected to LPNs need to experience difficulties in correctly receiving control information in the downlink transmitted by the downlink. Specifically, for LTE, UEs located in the extended range of LPNs and connected to LPNs may experience difficulty in correctly receiving control information in the downlink on the Physical Downlink Control Channel (PDCCH) since the UEs are experiencing geometry in the negative downlink. To minimize the effect of high interference on the PDCCH transmitted by the LPN, Almost Blank Subframes (ABSs) are used. During ABSs at the macro node, there is no data transmission from the macro node, which provides the advantage of low interference to LPN cells.
[0008] [0008] During an ABS at the macro node, the transmission from the macro node does not contain data or control information, but mainly Cell Specific Reference Signal (CRS) or Common. This means that the subframe in the corresponding uplink (that is, for LTE, the subframe in the uplink that occurs later 4 Transmission Time Intervals (TTIs) in the macro node will have no data transmission or because no Downlink control (DCI) (or control information in general) was transmitted on the downlink during ABS. As a result, the resources are not fully utilized, leading to a decrease in spectral capacity and efficiency.
[0009] [0009] The present description refers to systems and methods that provide efficient use of the spectrum in a cellular communication network that applies almost blank subframes. In the preferred mode, the cellular communication network is a heterogeneous cellular communication network (HetNet). In one mode, HetNet includes an access node that applies almost blank subframes to the downlink from the access node to user equipment devices (UEs) served by the access node. In a particular embodiment, the access node is a macro node. In another particular embodiment, the access node is a femto node, such as a closed subscriber group (CSG) femto cell. The almost blank subframes do not include control information. In order to provide efficient spectrum usage when using almost blank subframes on the downlink, the access node identifies one or more UEs for which transmissions are scheduled using a scheduling scheme that does not require control information for each subframe. Some exemplified programming schemes that do not require control information for each subframe are Transmission Time Interval (TTI) packaging, Semi-persistent Scaling (SPS), and Persistent Scaling (PS). The access node then aligns in time the scheduling instants of one or more UEs and subframes that correspond to at least some of the almost blank subframes in the downlink. In this way, at least some of the subframes that normally would not have staggered transmissions as a result of the lack of control information in the almost blank subframes are used by the scheduling instants for one or more UEs.
[0010] [0010] In an embodiment, in order to provide efficient use of the spectrum in the uplink, the access node identifies one or more UEs for which transmissions are scheduled for the uplink using a scheduling scheme that does not require control information for each subframe. Some scheduling schemes that do not require control information for each subframe are TTI, SPS and PS packaging. The access node then aligns the scheduling instants of one or more UEs and subframes in the uplink that correspond to at least some of the almost blank subframes in the downlink. For the uplink, the subframes in the uplink that correspond to at least some of the nearly blank subframes are subframes that occur in the uplink a predefined amount of time after at least some of the almost blank subframes. In this way, at least some of the subframes in the uplink that would not normally have staggered transmissions as a result of the lack of control information in the almost blank subframes are used by the scheduling instants for one or more UEs.
[0011] [0011] In another modality, in order to provide efficient spectrum usage for the downlink, the access node identifies one or more UEs for which the transmissions are scheduled for the downlink using a scheduling scheme that does not require information of control for each subframe. Some scheduling schemes that do not require control information for each subframe are SPS and PS. The access node then aligns the scheduling instants of the one or more UEs for the downlink and at least a subset of the almost blank subframes in the downlink. Thus, at least some of the almost blank subframes in the downlink that would normally not have scheduled transmissions as a result of the absence of control information would normally not have scheduled transmissions as a result of the absence of control information in the almost blank subframes. used by the scheduling instants to one or more UEs.
[0012] [0012] Those skilled in the art will appreciate the scope of this description and will understand the additional aspects of it after reading the following detailed description of the preferred modalities in association with the attached drawings. Brief Description of Drawings
[0013] [0013] The attached drawings incorporated and forming a part of this specification illustrate several aspects of the description, and together with the description serve to explain the principles of the same.
[0014] [0014] Figure 1 illustrates a heterogeneous cellular communication network (HetNet) including a macro node and a Low Power Node (LPN) according to a fashion-
[0015] [0015] Figure 2 illustrates exemplified Almost Blank Subframes (ABSs) applied to a downlink from the macro node in Figure 1.
[0016] [0016] Figure 3 illustrates an example downlink from the macro node including ABSs and an example uplink to the macro node where the uplink includes subframes in which no transmission is normally scheduled as a result of the ABSs in the downlink from the macro at the.
[0017] [0017] Figure 4 illustrates the operation of the macro node in Figure 1 to provide efficient use of spectrum when applying ABs in the downlink by aligning the timing of the scheduling moments of one or more user equipment devices (UEs). ) for which no transmission is scheduled according to the scheduling scheme which does not require control information for each subframe according to a modality of the present description.
[0018] [0018] Figure 5 illustrates the operation of the macro node in Figure 1 to provide efficient use of spectrum for the uplink when applying ABSs in the downlink according to a modality of the present description.
[0019] [0019] Figure 6 graphically illustrates the time alignment of Transmission Time Interval (TTI) packets for one or more UEs and subframes in the uplink that correspond to ABSs in the downlink according to an embodiment of the process of Figure 5.
[0020] [0020] Figure 7 graphically illustrates the time alignment of semi-persistent or persistent scheduling instants of one or more UEs and subframes in the uplink that correspond to ABSs in the downlink according to a modality of the process of Figure 5.
[0021] [0021] Figure 8 illustrates the operation of the macro node in Figure 1 to provide efficient use of the spectrum for the downlink when applying ABSs in the downlink according to a modality of the present description.
[0022] [0022] Figure 9 graphically illustrates the time alignment of semi-persistent or persistent scheduling instants of one or more UEs and subframes in the downlink that correspond to ABSs in the downlink according to a modality of the process of Figure 8.
[0023] [0023] Figure 10 illustrates a HetNet including a macro node and a femto node of the Closed Subscriber Group (CSG) according to another modality of the present description.
[0024] [0024] Figure 11 illustrates a HetNet including a macro node, a CSG femto node, and a peak node according to another embodiment of the present description.
[0025] [0025] Figure 12 illustrates a HetNet that provides cancellation of interference on the uplink according to a modality of the present description.
[0026] [0026] Figure 13 illustrates a HetNet that provides cancellation of interference in the downlink according to a modality of the present description.
[0027] [0027] Figure 14 is a block diagram of a macro node according to an embodiment of the present description.
[0028] [0028] Figure 15 is a block diagram of a femto node according to an embodiment of the present description.
[0029] [0029] Figure 16 is a block diagram of a user equipment device according to an embodiment of the present description. Detailed Description of the Invention
[0030] [0030] The modalities presented below represent the information needed to enable those skilled in the art to practice the modalities and illustrate the best way to practice them. Upon reading the following description in view of the attached drawings, those skilled in the art will understand the concepts of the description and recognize applications of those concepts not particularly addressed here. It should be understood that these concepts and applications are within the scope of the description and the attached drawings.
[0031] [0031] The present description refers to systems and methods that provide the efficient use of the spectrum in a heterogeneous cellular communication network (HetNet) that applies almost blank subframes (ABSs). Figure 1 illustrates a heterogeneous cellular communication network 10 (hereinafter called HetNet 10) according to an embodiment of the present description. The discussion below focuses on modalities where HetNet 10 operates according to a Long-Term Evolution pattern
[0032] [0032] As illustrated, HetNet 10 includes a macro node 12 and a Low Power Node (LPN) 14. Macro node 12 is a base station (for example, macro eNode B) that serves a corresponding macro cell 16. LPN 14 is also a base station, but transmits at a substantially lower power level than macro node 12. In addition, LPN 14 may have other characteristics that are different from macro node 12 (for example , a different number of antennas). LPN 14 can be, for example, an eNode B micro, pico, or femto. LPN 14 serves a corresponding Low Power (LP) cell 18. In addition, LPN 14 serves an expansion region 20 that surrounds cell LP 18. Expansion region 20 is a region in which a loss of path for LPN 14 it is less than a path loss for macro node 12, but where the signal strength received from macro node 12 is greater than the signal strength received from LPN 14. In the example illustrated, a user equipment device (UE) 22 is located in macro cell 16 and is served by macro node 12, and a UE 24 is located in the expansion region and is served by LPN 14. Preferably, transmissions to and from from macro node 12 are synchronized with transmissions to and from LPN 14.
[0033] [0033] As discussed in detail below, macro node 12 applies ABSs on the downlink from macro node 12. In general, ABSs do not include control information. In a particular embodiment, ABSs do not include control information and also do not include data. However, in one embodiment, ABSs can be either normal power ABSs that do not include control information and do not include data or low power ABSs that do not include control information, but include data. Low power ABSs are transmitted at low transmission power to reduce interference. ABSs provide an advantage that interference particularly for UEs, such as UE 24, located in expansion region 20 is reduced. Reduced interference improves the ability of UEs, such as UE 24, located in expansion region 20 to successfully receive a Physical Control Channel on the Downlink (PDCCH) from LPN 14.
[0034] [0034] Figure 2 illustrates ABSs exemplified in the downlink from the macro node
[0035] [0035] More specifically, Figure 3 illustrates a downlink (DL) transmission pattern exemplified in macro node 12 including ABSs and a corresponding exemplified uplink (UL) in macro node 12. ABSs do not include control information and also don't include data. As illustrated, the downlink includes a number of ABSs arranged according to an ABS standard. Note that the ABS standard is exemplified. Any ABS standard can be used. As the ABSs in the downlink do not contain any control information (ie, for LTE, the ABSs do not contain the DCI, which includes the PDCCH, the Hybrid ARQ Indicator Physical Channel (PHICH), and the Physical Format Indicator Channel Control Panel (PCFICH)), ABSs do not contain control information for scheduling transmissions in corresponding subframes of the uplink. As a result, no transmission is scheduled for the corresponding subframes of the uplink. As illustrated, for LTE, the corresponding subframes in the uplink are subframes that occur four Transmission Time Intervals (TTIs) after ABSs.
[0036] [0036] As illustrated in Figures 2 and 3, normally when using ABSs in the downlink, there is spectral inefficiency due to ABSs in the downlink and subframes in the uplink for which no transmission is staggered as a result of the ABSs in the downlink. Figure 4 is a flow chart illustrating the operation of macro node 12 of Figure 1 according to an embodiment of the present description. Generally,
[0037] [0037] As illustrated, macro node 12 applies ABSs to the downlink (step 100). ABSs are arranged in the downlink according to the desired ABS standard. The ABS pattern can be a predefined or predetermined ABS pattern. Alternatively, macro node 12 can adjust the ABS pattern as discussed below. In addition, macro node 12 identifies one or more UEs for which transmissions are scheduled using a scheduling scheme that does not require control information for each subframe (step 102). Note that the order of steps 100 and 102 can be reversed. In one modality, the scheduling scheme is TTI packaging. For TTI packaging, a single transmission concession for a UE is a concession for the entire TTI package, which for LTE is four consecutive TTIs, which is equivalent to four consecutive subframes. Thus, as discussed above, TTI packaging can be used to scale a TTI package that overlays subframes that correspond to ABSs in the downlink. In another embodiment, the scheduling scheme is a semi-persistent or persistent scheduling scheme where a single transmission concession to a UE is a concession for transmissions traversing one or more subframes at a defined periodicity. Note that in TTI packaging, semi-persistent scheduling (SPS) and persistent scheduling (PS) are suitable scheduling schemes that can be used for LTE. However, these types of scheduling schemes and potentially other suitable scheduling schemes can be used if HetNet 10 operates according to another standard.
[0038] [0038] Finally, macro node 12 aligns in time instants of escalation for one or more UEs identified in step 102 with the subframes that correspond to at least some of the ABSs in the downlink from macro node 12 (step 104). More specifically, for TTI packaging, the TTI packages for the UE (s) are aligned
[0039] [0039] Figure 5 is a flowchart that illustrates the operation of macro node 12 of Figure 1 to provide the use of efficient spectrum for the uplink when applying ABSs in the downlink according to a modality of the present description. In general, when using ABSs in the downlink, macro node 12 operates to fill at least some of the corresponding subframes in the uplink that normally would not contain transmissions due to the absence of control information in ABSs with staggered transmissions (ie, scheduling moments). according to scheduling schemes that do not require control information for each transmission subframe.
[0040] [0040] As illustrated, macro node 12 applies ABSs to the downlink (step 200). ABSs are arranged in the downlink according to a desired ABS standard. The ABS pattern can be a predefined or predetermined ABS pattern. Alternatively, macro node 12 can adjust the ABS pattern as discussed below. In addition, macro node 12 identifies one or more UEs for which transmissions on the uplink are scheduled using a scheduling scheme that does not require control information for each subframe (step 202). In other words, the scheduling scheme is any type of scheduling scheme that does not require that all downlink subframes include control information to schedule transmissions to the corresponding subframes in the uplink. Note that the order of steps 200 and 202 can be reversed.
[0041] [0041] More specifically, in one modality, the scaling scheme is TTI packaging. For TTI packaging, a single transmission concession for a UE is a concession for the entire TTI package, which for LTE, is four consecutive TTIs (that is, four consecutive subframes). Thus, TTI packaging can be used to scale a TTI package on the uplink that overlays subframes that correspond to ABSs on the downlink. In another embodiment, the scheduling scheme is a semi-persistent or persistent scheduling scheme where a single transmission concession to a UE for the uplink is a concession for transmissions traversing one or more subframes in the uplink at a defined periodicity. Note that for TTI packaging, SPS and SP are suitable scheduling schemes that can be used for LTE. However, these types of scheduling schemes and potentially other suitable scheduling schemes can be used if HetNet 10 operates according to another standard.
[0042] [0042] Finally, macro node 12 aligns the uplink scheduling instants in time for the one or more UEs identified in step 102 with uplink subframes that correspond to at least some of the ABSs in the downlink from macro node 12 ( step 204). The subframes in the uplink that correspond to the ABSs in the downlink are the subframes in the uplink that occur in the uplink a predefined amount of time after the corresponding ABSs in the downlink. For LTE, the corresponding subframes in the uplink are subframes that occur in the uplink four TTIs, or four subframes, after the ABSs in the downlink. More specifically, for TTI packaging, the TTI packages for the UE (s) in the uplink are time aligned with the subframes in the uplink that correspond to the ABS (s) in the downlink. Note that when using TTI packaging, macro node 12 can identify the UEs that use TTI packaging and then schedule transmissions (ie, scheduling moments) to those UEs using a desired prioritization or weighing scheme . The prioritization or weighing scheme can consider, for example, the type of data to be transmitted. For SPS or PS, the periodic scheduling instants for the UE (s) are time aligned with the subframes on the uplink that correspond to ABSs in the downlink from macro node 12. In one embodiment, the ABS pattern is predetermined, and time alignment is performed by aligning the scheduling instants with the subframes in the uplink that match
[0043] [0043] Figure 6 graphically illustrates the time alignment of TTI packets for one or more UEs and subframes in the uplink for the macro node 12 that correspond to the ABSs in the downlink from the macro node 12 according to a modality of the process of Figure 5 As illustrated, the downlink (DL) from macro node 12 includes a series of subframes including a first subframe that includes normal transmission along with control information (eg DCI) that schedules a TTI packet on the uplink (UL). The first subframe in the downlink is followed by three ABSs. Specifically, subframe O of the downlink is a normal transmission that includes the control information that schedules the TTI packet on the uplink. Subframes 1, 2, and 3 of the downlink are ABSs. As a result of the control information, a TTI packet (ie, for LTE, four consecutive subframes transmitting the same data) is transmitted on the uplink starting at subframe 4 and continuing through subframe 7 of the uplink.
[0044] [0044] Normally, ABSs in subframes 1, 2 and 3 of the downlink would result in no transmission being staggered to subframes 5, 6 and 7 of the uplink. In other words, when scaling the TTI packet appropriately, subframes in the uplink that were not used as a result of the ABSs in the downlink are now used for transmitting the TTI packet. In this way, macro node 12 provides efficient use of spectrum in the uplink for macro node 12 when using ABSs in the downlink from macro node 12.
[0045] [0045] Figure 7 graphically illustrates the time alignment of semi-persistent or persistent scheduling instants of one or more UEs and subframes in the uplink for macro node 12 that correspond to the ABSs in the downlink from macro node 12 according to another modality of the process in Figure 5. As shown, the downlink (DL) from macro node 12 includes a series of ABSs. Specific-
[0046] [0046] Figure 8 is a flowchart that illustrates the operation of macro node 12 of Figure 1 to provide efficient use of spectrum for the downlink when applying ABSs on the downlink according to a modality of the present description. As discussed above, ABSs do not include control information. In addition, for this modality, ABSs preferably do not include data. In general, when using ABSs in the downlink, macro node 12 operates to fill at least some of the ABSs in the downlink with data transmissions (ie, scaling times) scaled according to scaling schemes that do not require information control for each transmission subframe.
[0047] [0047] As illustrated, macro node 12 applies ABSs to the downlink (step 300). ABSs are arranged in the downlink according to a desired ABS standard. Again, the ABS pattern can be a predefined or predetermined ABS pattern. Alternatively, macro node 12 can adjust the ABS pattern as discussed below. In addition, macro node 12 identifies one or more UEs that are determined to be non-interfering in any neighboring LPNs such as LPN 14 (step 302). For example, UEs that are determined to be non-interfering may be UEs that are located close to macro node 12 as determined, for example, by the strength of the received signal (for example, they have a received signal strength for the downlink from of macro node 12 that is greater than a predefined limit). As another example, UEs that are determined to be non-interfering may be UEs that are located distant from LPN 14 as determined, for example, by the strength of the received signal (for example, they have a signal strength received for the downlink from the LPN 14 which is less than a predefined limit).
[0048] [0048] Among the non-interfering UEs identified in step 302, macro node 12 identifies one or more UEs for which downlink transmissions are scheduled using a scheduling scheme that does not require control information for each subframe ( step 304). In one embodiment, the scheduling scheme is SPS, PS, or a similar scheduling scheme. Note that LTE does not currently provide TTI packaging for the downlink. However, if Het-Net 10 were to operate according to a standard that provided TTI packaging in the downlink, then the escalation scheme can also be TTI packaging. Note that the order of steps 300, 302, and 304 can be changed (for example, steps 302 and 304 can be performed before step 300).
[0049] [0049] Then, macro node 12 aligns in time staggering times for one or more UEs identified in step 304 with at least some of the ABSs in the downlink from macro node 12 (step 306). More specifically, for SPS or PS, the periodic escalation times for the UE (s) are aligned in time with at least some of the ABSs in the downlink from macro node 12. Finally, macro node 12 reduces a level of transmission power for the transmission in the downlink during the transmission of the scheduling moments to the UEs that are aligned in time with the ABSs in the downlink (step 308). Notably, when reducing transmission power, macro node 12 preferably notifies UEs of reduced transmission power. This notification can be provided, for example, via Radio Resource Control (RRC) signaling. As another example, UEs may have predefined transmission modes that operate at different power levels, where macro node 12 can notify the UEs of the transmission power level via the UE's specific reference signals.
[0050] [0050] Figure 9 graphically illustrates the time alignment of semi-persistent or persistent scheduling instants of one or more UEs and ABSs in the downlink from macro node 12 according to a modality of the process in Figure 8. As illustrated, the downlink (DL) from macro node 12 includes ABSs. Specifically, in this example, subframes O and 4 of the downlink are ABSs, which usually do not contain data and do not include control information. However, semi-persistent or persistent transmissions staggered according to a semi-persistent or persistent scaling scheme are time aligned with subframes 3 to 6 of the downlink, such that the data is transmitted during the ABS of subframe 4. In other words, using the transmission instants of the scaled UEs using the semi-persistent or persistent scaling scheme, subframe 4 in the downlink that would not have been used as a result of being an ABS is now used for the transmission instants of the UEs. In this way, macro node 12 provides efficient use of spectrum in the downlink from macro node 12 when using ABSs in the downlink from macro node 12.
[0051] [0051] Figure 10 illustrates a HetNet 26 according to another embodiment of the present description. In this modality, HetNet 26 includes a macro node 28 that serves a corresponding macro cell 30 and a closed subscriber group femto node (CSG) 32 (hereinafter called femto node 32) that serves subscribers in a cell femto CSG 34 (hereinafter referred to as femto 34 cell). In the illustrated example, a UE 36 is a subscriber to femto node 32 and as such, UE 36 is served by femto node 32. However, UE 38 is not a subscriber to femto node 32 and as such, UE 38 is served by macro node 28. So, macro node 28 operates to serve UEs in femto cell 34 that are not subscribers to femto node 32 as well as UEs, such as UE 40, which are otherwise located in macro cell 30. Preferably, transmissions to and from macro node 28 are synchronized with transmissions to and from femto node 32.
[0052] [0052] In this modality, femto node 32 applies ABSs in the downlink from femto node 32 to femto node 32 subscribers located in femto cell 34. In one embodiment, femto node 32 uses the process described above with respect to the Figures 4 to 6 to align in time the scaling instants scaled according to a scaling scheme that does not require control information for each subframe and subframes in the uplink for femto node 32 that correspond to ABSs in the downlink from femto node 32. As discussed above, the scheduling scheme can be TTI, SPS, PS or similar packaging. As such, subframes on the uplink for femto node 32 for which no transmission would have been staggered as a result of ABSs on the downlink from femto node 32 are used, thus improving the spectral efficiency of femto node 32. In addition or alternatively , the femto node 32 can use the process described above with respect to Figures 8 and 9 to align the scheduling moments for the downlink scaled in time according to a scheduling scheme that does not require control information for each subframe and at minus some of the ABSs in the downlink from the femto node 32. As discussed above, the scheduling scheme can be TTI, SPS, PS or similar packaging. As such, at least some of the ABSs in the downlink that would not have included data are used, thus improving the spectral efficiency of the femto node 32.
[0053] [0053] Figure 11 illustrates a HetNet 42 according to another embodiment of the present description. In this modality, HetNet 42 includes a macro node 44 that serves a corresponding macro cell 46, a femto node CSG 48 (hereinafter referred to as femto node 48) that serves subscribers in a corresponding femto cell CSG 50 (hereinafter called femto cell 50), and a peak node 52 that serves a corresponding peak cell 54 and expansion region 56. In the illustrated example, a UE 58 is a subscriber to femto node 48 and, as such, UE 58 is served by femto node 48. However, UE 60 is not a subscriber to femto node 48 and, as such, UE 60 is served by macro node 44. UE 62 is located at peak cell 54 and is then served by peak node 52. Macro node 44 operates to serve UEs in femto cell 50 that are not subscribers to femto node 48, as well as UEs, such as UE 64, which are otherwise located in macro cell 46, but outside peak cell 54 and expansion region 56 of peak node 52. Preferably, transmissions to and from macro node 44 are synchronized with transmissions Sessions to and from femto node 48 and transmissions to and from peak node 52.
[0054] [0054] In this modality, femto node 48 applies ABSs in the downlink from femto node 48 to subscribers of femto node 48 located in femto cell 50. In one embodiment, femto node 48 uses the process described above with respect to Figures 4 to 6 to align in time the scaling instants scaled according to a scaling scheme that does not require control information for each subframe and subframes in the uplink for femto node 48 that corresponds to the ABSs in the downlink from femto node 48. How discussed above, the scheduling scheme can be TTI, SPS, PS or similar packaging. As such, subframes on the uplink for the femto node 48 for which no transmission would have been staggered as a result of the ABSs on the downlink from the femto node are used, thus improving the spectral efficiency of the femto node 48. In addition or ternatively, the femto node 48 can use the process described above with respect to Figures 8 and 9 to align in time scheduling moments for the downlink staggered according to a scheduling scheme that does not require control information for each subframe and at minus some of the ABSs in the downlink from the femto node 48. As discussed above, the scheduling scheme can be TTI, SPS, PS or similar packaging. As such, at least some of the ABSs in the downlink that would otherwise have not included data are used, thereby improving the spectral efficiency of the femto node 48.
[0055] [0055] Figure 12 illustrates a HetNet that provides cancellation of interference on the uplink according to one embodiment of the present description. As illustrated, HetNet includes a macro node serving a corresponding macro cell, an LPN serving an LPN cell, and UEs, ie UEI1 and UE2. The macro node sends PDCCH information to UE2 to schedule a transmission to UE2 on the uplink for the macro node (step 400). Preferably, the PDCCH schedules a TTI packet for the UE2 on the uplink for the macro node. However, other types of scheduling, such as, for example, SPS or PS, can be used. In addition, the macro node sends the PDCCH information to the UE2 to the LPN via a communication interface between nodes (for example, an X2 interface or another point-to-point network interface) (step 402). The UE2 then sends a transmission using the uplink's scaled features to the macro node (step 404). Again, preferably-
[0056] [0056] In order to cancel the interference for the transmission from the UE1 to the LPN, the LPN stores the transmission in the uplink from the UE1 (step 408). In addition, the LPN receives the transmission from the UE2 on the uplink to the macro node and processes the transmission to train one or more parameters for interference cancellation to cancel the interference caused in the transmission on the uplink from the UE1 (step 410). More specifically, preferably, transmission from UE2 is a TTI pack. The TTI packaging includes four transmissions of the same data, but the four transmissions are encoded differently (that is, Incremental Redundancy, in order to obtain encoding gains). If the LPN is able to decode the first transmission of the TTI packet correctly, the LPN can then train the parameters for interference cancellation using the remaining transmissions in the TTI packet, which use the same physical resource blocks, but using different known encoding. Note, however, that this same process can be used even if the LPN needs the first two or even three of the transmissions to successively decode the data, where the remaining transmissions after successful decoding are used to train the parameters for interference cancellation. A similar process can be used to train interference cancellation using SPS or PS. Finally, the LPN performs interference cancellation for transmission on the stored uplink from the UE1 using the parameters determined in step 410 (step 412). In this way, interference cancellation is performed to remove, or at least substantially remove, the interference in the transmission on the uplink from the UE1 to the LPN caused by the transmission on the uplink from the UE2 to the macro node.
[0057] [0057] Figure 13 illustrates a HetNet that provides cancellation of interference in the downlink according to a modality of the present description. As illustrated, HetNet includes a macro node serving a corresponding macro cell, an LPN serving an LPN cell, and UEs, ie UEI1 and UE2. The macro node sends PDCCH information to the UE2 for repetitive downlink transmission (for example, a TTI | packet or an ARQ retransmission) to the UE2 on the downlink to the macro node (step 500). In addition, the macro node sends the PDCCH information to the UE2 to the LPN via a communication interface between nodes (for example, an X2 interface or another point-to-point network interface) (step 502). The LPN then sends the PDCCH information to the UE2 to the UE1 via, for example, RRC signaling (step 504). Then, the macro node transmits to UE1 using the scaled downlink resources from the macro node (step 506). At the same time, the LPN transmits data to the UE1 using the same resources as the downlink from the LPN (step 508).
[0058] [0058] In order to cancel the interference for the downlink transmission from the LPN to the UE1, the UE1 stores the transmission in the downlink from the LPN (step 510). In addition, the UE1 receives the downlink transmission from the macro node to the UE2 using the PDCCH information received from the LPN and processes the downlink transmission to train one or more parameters for interference cancellation (step 512). Here, interference cancellation is to cancel the interference in the downlink transmission to the UE1 resulting from the downlink transmission to the UE2. Finally, the UE1 performs interference cancellation for the downlink transmission stored from the LPN using the deter parameters - completed in step 512 (step 514). In this way, interference cancellation is performed to remove, or at least substantially remove, the interference in the LPN downlink transmission to the UE1 caused by the downlink transmission from the macro node to the UE2.
[0059] [0059] Figure 14 is a block diagram of a macro node 66 according to an embodiment of the present description. Macro node 66 can be macro node 12 in Figure 1, macro node 28 in Figure 10, or macro node 44 in Figure 11. Macro node 66 includes a transceiver subsystem 68, a communication interface between nodes 70, and a processing subsystem 72. Transceiver subsystem 68 generally includes analog components and, in some embodiments, digital components for sending and receiving communications to and from UEs within the macro cell of macro node 66. The communication interface between nodes 70 generally includes analogue components and, in some modalities, digital components to send and receive communications to and from other nodes (that is, other macro nodes and, in some modalities, neighboring nodes and / or neighboring femto nodes). From a visualization of the communications protocol, the transceiver subsystem 68 and the communication interface between nodes 70 implement at least part of Layer 1 (that is, the Physical layer or “PHY”). The processing subsystem 72 generally implements any remaining part of Layer 1, as well as functions for higher layers in the wireless communications protocol (for example, Layer 2 (data link layer), Layer 3 (network layer) , etc.). Certainly, the detailed operation for each of the functional protocol layers, and thus of the transceiver subsystem 68, the communication interface between nodes 70, and the processing subsystem 72, will vary depending on both the particular implementation, and the standard or standards supported by macro node 66. In some embodiments, processing subsystem 72 generally operates to align time frames with uplink subframes that correspond to ABSs in the downlink and / or time line down in the downlink with the ABSs in the downlink, as described above.
[0060] [0060] Those skilled in the art will appreciate that the block diagram of macro node 66 necessarily omits numerous characteristics that are not necessary for a complete understanding of this description. For example, while not all details of processing subsystem 72 are illustrated, those skilled in the art will recognize that processing subsystem 72 comprises one or more general purpose or special purpose microprocessors or other microcontrollers programmed with software and / or appropriate software to perform some or all of the functionality of macro node 66 described here. In addition or alternatively, processing subsystem 72 may comprise several digital hardware blocks (for example, one or more Application Specific Integrated Circuits (ASICs), one or more analog and digital hardware components for
[0061] [0061] Figure 15 is a block diagram of a female node 74 according to an embodiment of the present description. The femto node 74 can be the femto node 32 of Figure 10 or the femto node 48 of Figure 11. The femto node 74 includes a transceiver subsystem 76, a communication interface between nodes 78, and a processing subsystem 80 The transceiver subsystem 76 generally includes analog components and, in some embodiments, digital components for sending and receiving communications to and from subscribers within the femto cell of the femto node 74. The communication interface between nodes 78 generally includes analog components and, in some modalities, digital components to send and receive communications to and from other nodes (that is, macro nodes and, in some modalities, neighboring nodes and / or neighboring femto nodes). From a communications protocol view, the transceiver system 76 and the communication interface between nodes 78 generally implement any remaining part of Layer 1, as well as functions for higher layers in the wireless communications protocol (for example, example, Layer 2 (data link layer), Layer 3 (network layer), etc.). Certainly, the detailed operation for each of the functional protocol layers, and thus of the transceiver subsystem 76, the communication interface between nodes 78, and the processing subsystem 80, will vary depending on both the particular implementation, and the standard or standards supported by the femto node 74. In some embodiments, the processing subsystem 80 generally operates to align the time frames with subframes in the uplink that correspond to the ABSs in the downlink and / or time align the time frames in the downlink with the ABSs downlink, as described above.
[0062] [0062] Those skilled in the art will appreciate that the block diagram of the femto node 74 necessarily omits numerous characteristics that are not necessary for a complete understanding of this description. For example, although all details of processing subsystem 80 are not illustrated, those skilled in the art will recognize that processing subsystem 80 comprises one or more general purpose or special purpose microprocessors or other microcontrollers programmed with software and / or software to perform some or all of the functionality of the femto 74 node described here. In addition or alternatively, processing subsystem 80 may comprise several digital hardware blocks (for example, one or more Application Specific Integrated Circuits (ASICs), one or more standardized analog and digital hardware components, or one combination of these) configured to perform some or all of the functionality of the femto 74 node described here.
[0063] [0063] Figure 16 is a block diagram of a UE 82 according to an embodiment of the present description. UE 82 can be any of the UEs in Figures 1, 10 and 11. UE 82 includes a transceiver subsystem 84 and a processing subsystem 86. Transceiver subsystem 84 generally includes analog components and, in some embodiments, digital components to send and receive communications to and from a macro node, a femto node, or a peak node. From a communications protocol view, transceiver subsystem 84 implements at least part of Layer 1 (that is, the Physical layer or “PHY"). Processing subsystem 86 generally implements any remaining part of Layer 1, as well as functions for higher layers in the wireless communications protocol (eg Layer 2 (data link layer), Layer 3 (network layer), etc.). Certainly, the detailed operation for each of the functional protocol layers, and thus of the transceiver subsystem 84, and processing subsystem 86, will vary depending on both the particular implementation, and the standard or standards supported by the UE 82.
[0064] [0064] Those skilled in the art will appreciate that the UE 82 block diagram necessarily omits numerous features that are not necessary for a complete understanding of this description. For example, while not all details of processing subsystem 86 are illustrated, those skilled in the art will recognize that processing subsystem 86 comprises one or more general purpose or special purpose microprocessors or other microcontrollers programmed with software and / or appropriate software to perform some or all of the functionality of the UE 82 described here. In addition or alternatively, the processing subsystem 80 may comprise several digital hardware blocks (for example, one or more Application Specific Integrated Circuits (ASICs), one or more standardized analog and digital hardware components, or a combination thereof) configured to perform some or all of the functionality of the UE 82 described here.
[0065] [0065] The following acronyms are used throughout this description. ABS - Almost Blank Subframe ARQ - ASIC Automatic Repeat Request - Specific Application BS Integrated Circuit - CRS Base Station - CSG Specific or Common Cell Reference Signal - Closed Subscriber Group dBm - Decibel-Miliwatt DCI - Control Information downlink DL - Downlink HetNet - Heterogeneous Network LP - Low Power LPN - Low Power LTE Node - Long Term Evolution PCFICH - Physical Channel PDCCH Control Format Indicator - Physical Downlink Control Channel PDSCH - Physical Downlink Channel PHICH - Indicated Physical Channel of ARQ-Hybrid PS - Persistent QoS Scaling - Quality of Service RE - Range extension RRC - Radio Resource Control RSRP - Received Reference Signal Energy RSS - Received Signal Strength
[0066] [0066] Those skilled in the art will recognize improvements and modifications to the preferred modalities of this description. All such improvements and modifications are considered within the scope of the concepts described here and in the claims that follow.

权利要求:
Claims (43)
[1]
1. Method of operation of an access node in a cellular communication network, characterized by the fact that it comprises: applying almost blank subframes in a downlink from the access node; identify one or more user equipment devices for which transmissions are to be scheduled using a scheduling scheme that does not require control information for each subframe; and align, in time, the scheduling of one or more user equipment devices and subframes that correspond to at least some of the almost blank subframes in the downlink.
[2]
2. Method according to claim 1, characterized by the fact that: identifying one or more user equipment devices comprises identifying one or more user equipment devices for which transmissions must be staggered on an uplink to the access using the scheduling scheme that does not require control information for each subframe; and aligning the scheduling instants in time donates one or more user equipment devices and subframes that correspond to at least some of the nearly blank subframes in the downlink comprises aligning the scheduling instants of the one or more user equipment devices in time to the uplink with subframes in the uplink that correspond to at least some of the almost blank subframes in the downlink.
[3]
3. Method according to claim 2, characterized by the fact that the almost blank subframes in the downlink do not contain control information for corresponding subframes in the uplink.
[4]
4. Method according to claim 2, characterized in that the subframes in the uplink that correspond to at least some of the almost blank subframes in the downlink are subframes in the uplink that occur in a predefined amount of time after the at least some subframes almost blank in the downlink.
[5]
5. Method according to claim 2, characterized in that the subframes in the uplink that correspond to at least some of the almost blank subframes in the downlink are subframes in the uplink that occur in four transmission time intervals after at least a few of the almost blank subframes in the downlink.
[6]
6. Method according to claim 2, characterized by the fact that the scheduling scheme is TTI packaging.
[7]
7. Method according to claim 6, characterized by the fact that in time the scaling moments of one or more user equipment devices for the uplink are aligned with subframes in the uplink that correspond to at least some of the almost blank subframes in the downlink comprises, for each user equipment device of one or more user equipment devices, to schedule a transmission of a TTI packet to uplink subframes that include at least one subframe in the uplink that corresponds to an almost blank subframe in the downlink.
[8]
8. Method according to claim 6, characterized by the fact that the access node is a macro node, and the method further comprising providing control information related to the escalation of a TTI package to a user equipment device of one or more more user equipment devices for a low-power neighboring node in the cellular communication network.
[9]
9. Method according to claim 8, characterized by the fact that the neighboring low-power node uses the control information to receive the TTI packet from the user equipment device on the uplink to the macro node and to perform interference cancellation for a uplink from a user equipment device to the neighboring low power node.
[10]
10. Method according to claim 2, characterized by the fact that the scheduling scheme is a semi-persistent scheduling scheme.
[11]
11. Method according to claim 10, characterized by the fact that in time align the scheduling instants of the one or more user equipment devices for the uplink with subframes in the uplink that correspond to at least some of the almost blank subframes in the downlink comprises, for each user equipment device of one or more user equipment devices, to scale a plurality of semi-persistent scheduling instants to the user equipment device so that at least a subset of the plurality of scheduling instants for the user equipment device to be scaled to subframes in the uplink that correspond to almost blank subframes in the downlink.
[12]
12. Method according to claim 2, characterized by the fact that the scheduling scheme is a persistent scheduling scheme.
[13]
13. Method according to claim 12, characterized by the fact that in time align the scheduling instants of one or more user equipment devices for the uplink with subframes in the uplink that correspond to at least some of the almost blank subframes in the downlink comprises, for each user equipment device of the one or more user equipment devices, to scale a plurality of persistent scheduling instants to the user equipment device so that at least a subset of the plurality of persistent scheduling instants to the user equipment device is scaled to subframes on the uplink that correspond to almost blank subframes on the downlink.
[14]
14. Method according to claim 1, characterized by the fact that: identifying one or more user equipment devices comprises: identifying one or more non-interfering user equipment devices that are determined not to interfere with any neighboring peak nodes ;
and identifying one or more user equipment devices from one or more non-interfering user equipment devices for which downlink transmissions must be scaled using the scaling scheme that does not require control information for each subframe; and aligning the scheduling instants of one or more user equipment devices and subframes in time that correspond to at least some of the nearly blank subframes in the downlink comprises aligning the scheduling instants of one or more user equipment devices in time for the downlink with at least some of the almost blank subframes in the downlink.
[15]
15. Method according to claim 14, characterized in that it further comprises reducing a level of transmission power to the downlink during the transmission of at least some of the almost blank subframes in the downlink.
[16]
16. Method according to claim 14, characterized by the fact that the almost blank subframes in the downlink do not contain control information.
[17]
17. Method according to claim 14, characterized by the fact that the scheduling scheme is a semi-persistent scheduling scheme.
[18]
18. Method according to claim 17, characterized by the fact that in time aligning the scheduling instants of the one or more user equipment devices for the downlink with at least some of the almost blank subframes in the downlink comprises, for each user equipment device of one or more user equipment devices, scale a plurality of semi-persistent scheduling instants to the user equipment device so that at least a subset of the plurality of semi-persistent scheduling instants for the user equipment device is scaled to almost blank subframes in the downlink.
[19]
19. Method according to claim 17, characterized by the fact that in time aligning the scheduling moments of the one or more user equipment devices for the downlink with at least some of the almost blank subframes in the downlink comprises, for each user equipment device of one or more user equipment devices, scale a plurality of persistent scheduling instants to the user equipment device so that at least a subset of the plurality of persistent scheduling instants for the user equipment device scaled to almost blank subframes in the downlink.
[20]
20. Method according to claim 14, characterized in that the scheduling scheme is a persistent scheduling scheme.
[21]
21. Method according to claim 1, characterized by the fact that the access node is a macro node.
[22]
22. Method according to claim 21, characterized by the fact that transmissions to the macro node are synchronized with transmissions to a neighboring low-power node.
[23]
23. Method according to claim 1, characterized by the fact that the access node is a closed subscriber group femto node.
[24]
24. Method according to claim 23, characterized in that transmissions to the closed subscriber group femto node are synchronized with transmissions to a neighboring macro node.
[25]
25. Method according to claim 1, characterized by the fact that the almost blank subframes in the downlink are arranged according to a predetermined almost blank subframe pattern, and to align in time the scaling moments of the one or more user equipment and subframes that correspond to at least some of the nearly blank subframes in the downlink comprise scaling the scaling moments of one or more user equipment devices according to the predetermined almost blank subframe pattern.
[26]
26. Method according to claim 1, characterized by the fact that in time aligning the scheduling instants of the one or more user equipment devices and subframes that correspond to at least some of the almost blank subframes in the downlink comprises adjusting a pattern from almost blank subframe to almost blank subframes in the downlink so that the scaling moments of one or more user equipment devices are aligned in time with subframes that correspond to at least some of the almost blank subframes in the downlink.
[27]
27. Access node in a cellular communication network, characterized by the fact that it comprises: a transceiver subsystem adapted to provide a downlink and an uplink to user equipment devices served by the access node; and a processing subsystem associated with the transceiver subsystem and adapted to: apply almost blank subframes to the macro node downlink; identify one or more user equipment devices for which transmissions are to be scheduled using a scheduling scheme that does not require control information for each subframe; and align, in time, the scheduling of one or more user equipment devices and subframes that correspond to at least some of the almost blank subframes in the downlink.
[28]
28. Macro node according to claim 27, characterized by the fact that: the one or more user equipment devices are one or more user equipment devices for which uplink transmissions must be staggered on an uplink to the node access using the scheduling scheme that does not require control information for each subframe; and the scaling instants of one or more user equipment devices are scaling instants of one or more user equipment devices for the uplink that are aligned in time with subframes on the uplink that correspond to at least some of the almost blank subframes in the downlink.
[29]
29. Macro node according to claim 28, characterized by the fact that the almost blank subframes in the downlink do not contain control information for corresponding subframes in the uplink.
[30]
30. Macro node according to claim 28, characterized in that the subframes in the uplink that correspond to at least some of the almost blank subframes in the downlink are subframes in the uplink that occur in a predefined amount of time after the at least some of the almost blank subframes in the downlink.
[31]
31. Macro node according to claim 28, characterized by the fact that the subframes in the uplink that correspond to at least some of the almost blank subframes in the downlink are subframes in the uplink that occur in four transmission time intervals after at least some of the almost blank subframes in the downlink.
[32]
32. Macro node according to claim 28, characterized by the fact that the scheduling scheme is TTI packaging,
[33]
33. Macro node according to claim 28, characterized by the fact that the scheduling scheme is a semi-persistent scheduling scheme.
[34]
34. Macro node according to claim 28, characterized by the fact that the scheduling scheme is a persistent scheduling scheme.
[35]
35. Macro node according to claim 27, characterized by the fact that the access node is a macro node, and: the one or more user equipment devices are one or more user equipment devices determined not to interfere with any peak nodes neighboring the macro node and for which downlink transmissions should be scaled using the scheduling scheme that does not require control information for each subframe; and the scaling instants of one or more user equipment devices are aligned in time with at least some of the almost blank subframes in the downlink.
[36]
36. Access node according to claim 35, characterized by the fact that the processing subsystem is further adapted to reduce a level of transmission power to the downlink during the transmission of the almost blank subframes on the downlink.
[37]
37. Access node according to claim 35, characterized by the fact that the almost blank subframes in the downlink do not contain control information.
[38]
38. Access node according to claim 27, characterized by the fact that the scheduling scheme is a semi-persistent scheduling scheme.
[39]
39. Access node according to claim 27, characterized by the fact that the scheduling scheme is a persistent scheduling scheme.
[40]
40. Access node according to claim 27, characterized by the fact that the access node is a macro node.
[41]
41. Access node according to claim 40, characterized by the fact that transmissions to the macro node are synchronized with transmissions to a neighboring low power node.
[42]
42. Access node according to claim 27, characterized in that the access node is a closed subscriber group femto node.
[43]
43. Access node according to claim 42, characterized by the fact that transmissions to the closed subscriber group femto node are synchronized with transmissions to a neighboring macro node.
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法律状态:
2018-01-23| B25D| Requested change of name of applicant approved|Owner name: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) (SE) |

2019-02-19| B25L| Entry of change of name and/or headquarter and transfer of application, patent and certificate of addition of invention: publication cancelled|Owner name: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL) (SE) Free format text: ANULADA A PUBLICACAO CODIGO 25.4 NA RPI NO 2455 DE 23/01/2018 POR TER SIDO INDEVIDA. |

2020-11-10| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|

2020-12-15| B08F| Application dismissed because of non-payment of annual fees [chapter 8.6 patent gazette]|Free format text: REFERENTE A 8A ANUIDADE. |

2021-04-13| B08K| Patent lapsed as no evidence of payment of the annual fee has been furnished to inpi [chapter 8.11 patent gazette]|Free format text: EM VIRTUDE DO ARQUIVAMENTO PUBLICADO NA RPI 2606 DE 15-12-2020 E CONSIDERANDO AUSENCIA DE MANIFESTACAO DENTRO DOS PRAZOS LEGAIS, INFORMO QUE CABE SER MANTIDO O ARQUIVAMENTO DO PEDIDO DE PATENTE, CONFORME O DISPOSTO NO ARTIGO 12, DA RESOLUCAO 113/2013. |

2021-06-01| B350| Update of information on the portal [chapter 15.35 patent gazette]|

2021-12-07| B350| Update of information on the portal [chapter 15.35 patent gazette]|

优先权:

申请号 | 申请日 | 专利标题

US13/310,177|2011-12-02|

US13/310,177|US9253794B2|2011-12-02|2011-12-02|Efficient spectrum utilization with almost blank subframes|

PCT/IB2012/056836|WO2013080159A1|2011-12-02|2012-11-29|Efficient spectrum utilization with almost blank subframes|

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