System and method for obtaining configured output power with different ttis

Abstract

The invention name of the present disclosure is "System and method for deriving configured output power with different TTIs." According to certain embodiments, a method by a wireless device for determining a maximum output power is provided. The method includes obtaining, by the wireless device, a first time resource for transmitting a first signal in a first cell on a first carrier and a second time resource for transmitting a second signal in a second cell on a second carrier. A maximum output power is determined based on the first time resource and the second time resource. The first signal and the second signal are transmitted based on the determined maximum output power.

Description

TECHNICAL FIELD

[0001] The present disclosure relates generally to wireless communications and more specifically to systems and methods for configured output power with different transmission time index (TTI) patterns for carrier aggregation. BACKGROUND

[0002] LTE uses OFDM in the downlink and DFT-spread OFDM in the uplink. In the time domain, LTE downlink transmissions are organized into radio frames of 10 ms each, which are divided into ten equally-sized subframes of length T 子帧 = 1 ms. An example LTE time domain structure is illustrated in FIG. 1. Figure 1

[0003] Resource allocation in LTE is typically described in terms of resource blocks (RBs). A resource block corresponds to one slot (0.5 ms) in the time domain and 12 contiguous subcarriers in the frequency domain. A pair of two adjacent resource blocks in the time direction (1.0 ms) can be referred to as a resource block pair. This is also referred to as a TTI (transmission time index).

[0004] Downlink transmissions are dynamically scheduled. For example, in each subframe, the base station transmits control information about to which terminals data is transmitted and on which resource blocks the data is transmitted in the current downlink subframe. This control signaling is typically transmitted in the first 1, 2, 3, or 4 OFDM symbols in each subframe and the number n = 1, 2, 3, or 4 is referred to as the control format indicator (CFI), which is indicated by the physical CFI channel (PCFICH) transmitted in the first symbol of the control region. The control region also contains the physical downlink control channel (PDCCH) and possibly also the physical HARQ indicator channel (PHICH) carrying ACK / NACK for uplink transmissions.

[0005] The downlink subframe also contains common reference symbols (CRS), which are known to the receiver and used for coherent demodulation of e.g. control information. A downlink system with CFI = 3 OFDM symbols as control is illustrated in FIG. 2. In Release 8 TTI, one such part of a DL transmission is referred to as one TTI. Figure 2

[0006] Uplink power control plays an important role in radio resource management, which is employed in most modern communication systems. It balances the need to maintain link quality with the need to minimize interference to other users of the system and maximize terminal battery life.

[0007] ​​In LTE, the goal of power control is to determine the average power on SC-FDMA symbols and it applies to both common and dedicated channels (PUCCH / PUSCH / SRS). A combined open and closed loop power control is employed as formulated in Equation 1 disclosed below:

[0008] Open loop power control: The wireless device (UE) computes a basic open loop set-point based on a path loss estimate and an eNodeB controlled semi-static base level (P0) which includes a nominal power level common to all UEs in the cell and a UE specific offset;

[0009] Closed loop power control: The eNodeB updates the dynamic adjustment relative to the set-point; the wireless device (UE) adjusts the transmit power according to TPC commands. It is also possible to link the power control to the modulation and coding scheme used for the uplink transmission.

[0010] (Equation 1)

[0011] Uplink power control is used on both PUSCH and PUCCH. The goal is to ensure that the mobile terminal transmits with a high enough, but not too high, power since the latter would increase the interference to other users in the network. In both cases, a parameterized open loop is used in combination with a closed loop mechanism. Roughly speaking, the open loop part is used to set the operating point, and the closed loop component operates around this operating point. Different parameters (target and 'partial compensation factor') are used for the user and control plane.

[0012] In more detail, for PUSCH, the mobile terminal sets the output power according to the following equation:

[0013]

[0014] where is the maximum transmit power of the mobile terminal, is the number of assigned resource blocks, and is the control target received power, is the estimated path loss, is the transport format compensator and is the UE specific offset or 'closed loop correction' (function may represent an absolute or accumulated offset). The index refers to the component carrier number and is only relevant for carrier aggregation.

[0015] Closed loop power control can operate in two different modes (accumulative or absolute). Both modes are based on TPC commands, which are part of the downlink control signaling. When using absolute power control, the closed loop correction function is reset every time a new power control command is received. When using accumulative power control, the power control commands are incremental corrections with respect to the previous accumulative closed loop correction. The accumulative power control command is defined as where is the TPC command received in subframe before the current subframe i and is the accumulative power control value. Absolute power control has no memory, i.e. .

[0016] PUCCH power control has in principle the same configurable parameters, except that PUCCH has only full path loss compensation, i.e. only cases are involved.

[0017] Typically, the configured transmit power PCMAX is defined in section 6.2.5 of 3GPP TS 36.101 as written in the following:

[0018] 6.2.5 Configured transmit power

[0019] The UE is allowed to set its configured maximum output power P CMAX,c for a serving cell c to

[0020] where

[0021]

[0022] where

[0023] - P EMAX,c is the value given by the IE P-Max of the serving cell c as defined in 3GPP TS 36.331 ;

[0024] - P PowerClass is the maximum UE power specified in table 6.2.2-1 but not taking into account the tolerances specified in table 6.2.2-1;

[0025] - the MPR c and A-MPR c of the serving cell c are specified in subclause 6.2.3 and subclause 6.2.4, respectively;

[0026] - is the additional tolerance of the serving cell c as specified in table 6.2.5-2; otherwise = 0;

[0027] - When NOTE 2 in Table 6.2.2-1 applies, ;

[0028] - When NOTE 2 in Table 6.2.2-1 does not apply, .

[0029] P-MPR c is the maximum allowed output power reduction, used

[0030] a) to ensure compatibility with applicable electromagnetic energy absorption requirements and to address the non-intentional emission / self-protection requirements for the case of simultaneous transmissions on multiple RATs for scenarios not within the scope of 3GPP RAN specifications;

[0031] b) to ensure compatibility with applicable electromagnetic energy absorption requirements in case of proximity detection is used to address requirements that need lower maximum output power.

[0032] The UE shall apply P-MPR c for the serving cell c only for the cases described above. For conformance testing of the UE, P-MPR will be 0 dB.

[0033] NOTE 1: P CMAX,c -MPR c is introduced in the equation for P c -MPR CMAX_L,c may impact the maximum uplink performance of the selected UL transmission path.

[0034] NOTE 2: P CMAX_L,c -MPR PowerClass is not applied.

[0035] For each subframe, P UMAX,c -MPR CMAX,c of the serving cell c is evaluated per time slot and given by the minimum value taken over the transmissions within that time slot; the minimum P CMAX_L,c -MPR CMAX_H,c applies for the whole subframe. During any period, P L -MPR c will not be exceeded by the UE.

[0036] The configured maximum output power P c -MPR CMAX_L,c will be within the following limits:

[0037]

[0038] where T(P CMAX_L,c ) is defined by the table of tolerances below and applies independently for P PowerClass and P UMAX,c , while T CMAX,c is the absolute value of the lower tolerance in Table 6.2.2-1 for the applicable operating band.

[0039]

[0040] For UEs supporting inter-band carrier aggregation configuration where uplink is assigned to one E-UTRA band, the applicable bands in Table 6.2.5-2 are defined .

[0041] Packet data latency is one of the performance metrics that is regularly measured by vendors, operators, and also end users (via speed test applications). Latency measurements are taken at all times during the lifetime of a radio access network system, when verifying new software releases or system components, when deploying a system, and when the system is in commercial operation.

[0042] Shorter latency than previous generations of 3GPP RATs was one of the performance metrics that guided the design of Long Term Evolution (LTE). LTE is now also recognized by end users as a system that provides faster Internet access and lower data latency than previous generations of mobile radio technology.

[0043] Packet data latency is not only important for perceived system response; it is also a parameter that indirectly influences system throughput. Today, HTTP / TCP is the dominant application and transport layer protocol suite used over the Internet. According to the HTTP Archive (http: / / httparchive.org / trends.php), the typical size of HTTP-based transactions over the Internet ranges from tens of kilobytes up to 1 megabyte. Within this size range, the TCP slow-start period is a significant portion of the total transmission period of a packet flow. During the TCP slow-start period, performance is limited by latency. Therefore, for this type of TCP-based data transaction, improved latency can quite easily show an increase in average throughput.

[0044] The impact of latency reduction on radio resource efficiency can be positive. Lower packet data latency can increase the number of transmissions possible within a certain delay bound; therefore, a higher block error rate (BLER) target can be used for data transmissions that release radio resources, potentially increasing system capacity.

[0045] One area to address when it comes to packet latency reduction is to reduce the transport time of data and control signaling by addressing the length of the transmission time interval (TTI). In LTE Release 8, the TTI corresponds to one subframe (SF) of length 1 millisecond (ms). One such 1 ms TTI is constructed by using 14 OFDM or SC-FDMA symbols in case of normal cyclic prefix and 12 OFDM or SC-FDMA symbols in case of extended cyclic prefix. In LTE Release 13, a study item started in 2015 with the goal to specify transmissions with a much shorter TTL than the LTE Release 8 TTI. It can be decided to have the shorter TTI with any duration and including resources over multiple OFDM or SC-FDMA symbols within a 1 ms SF. As one example, the duration of the short TTI can be 0.5 ms, i.e. seven OFDM or SC-FDMA symbols for the case of normal cyclic prefix. As another example, the duration of the short TTI can be 2 symbols.

[0046] As shown in Figure 2 , the TTI length consists of 14 OFDM symbols. In case of shortening the TTI, the TTI length can be reduced to 2 OFDM symbols, 4 OFDM symbols or 7 OFDM symbols. These are referred to as: 2-OS sTTI, 4-OS sTTI, 7-OS sTTI, respectively.

[0047] The shortening TTI can be used with different values on different directions, e.g. DL and UL. For example: DL can use 2-OS sTTI, while UL can use 4-OS sTTI in the same cell.

[0048] The sTTI used can also be different for different frame structures, e.g. FS1, FS2 and FS3. Figure 1 The time domain structure in Figure 3 involves FS1. 2-OS, 4 OS and 7 OS TTIs are available for FS1. For FS2 used for TDD, 7-OS sTTI is one of the shortening TTI modes. Figure 4 The sTTI structure illustrated in

[0049] In current specifications, the minimum UE transmit maximum power P CMAX_L,cThis is meaningful when the minimum resource unit is 1 RB (corresponding to a 1 ms TTI value). With the introduction of the shortened TTI feature, UEs will be scheduled on a smaller TTI basis. When a UE is configured with a shorter TTI, there is no rule to estimate Pcmax.

[0050] Carrier aggregation is one of the ways to increase per-user throughput for users with good channel conditions and with the ability to receive and transmit at higher data rates. A UE can be configured to be in two or three (or more) simultaneous bands in the DL and / or UL.

[0051] Figure 5A A network node capable of operating different cells simultaneously is illustrated. In particular, Figure 5A A network node operating four different cells simultaneously is illustrated. These cells can operate in different bands or also in the same band. In Release 8, only one cell is used for communication between the eNB and the UE.

[0052] However, there can be CA cases based on different number of CCs in the downlink (DL) and / or uplink (UL). For example, there can be a two-DL CA scenario (i.e., CA with 2 DL CCs and 1 UL CC). As with Figure 5A Figure 5B A two-cell enabled in a cell for one wireless device is illustrated, which is the initial version of DL carrier aggregation. In this scenario, the wireless device is configured to receive in 2 DL bands simultaneously, while still using UL in only one of the bands. The UL allocation in this case is arbitrary, which means that any of the bands can be used for UL transmission.

[0053] In the carrier aggregation terminology, the cell where UL is allocated for a certain wireless device is the PCell (primary cell), while the other aggregated cells are SCells (secondary cells). The combination of PCell and SCells is wireless device specific.

[0054] Additionally, three DL bands can be allocated to any wireless device 110. In this scenario, 3DL carrier aggregation is achieved, as depicted in Figure 5C This scenario can be considered as "3DL CA", where CA includes 3 DL CCs and 1 or 2 UL CCs. Similar to the 2DL case, UL can be allocated to any of the bands.

[0055] In Figure 5D ​In another scenario depicted in the middle, a wireless device can also be enabled with UL carrier aggregation. This can be considered "2UL CA", where the CA includes 2 UL CCs and 2 or 3 DL CCs. In this case, only 2UL and 2DL carrier aggregation is shown. In the case of UL carrier aggregation, the PCell and SCell definitions are still UE specific.

[0056] Depending on the carrier frequencies, or depending on the physical eNB deployment, the deployment of CA-enabled systems can vary greatly.

[0057] Figure 6A and 6B Two examples of CA deployment are provided. Specifically, Figure 6A F1 and F2 cells are shown to be co-located and overlaid, but F2 has a smaller coverage due to larger path loss. Only F1 provides sufficient coverage and F2 is used to improve throughput. Mobility is performed based on F1 coverage. This is one possible scenario when F1 and F2 belong to different frequency bands, e.g., F1 = {800 MHz, 2 GHz} and F2 = {3.5 GHz}, etc. Aggregation is expected to be possible between overlaid F1 and F2 cells. Figure 6B Different kinds of deployments are illustrated. In this case, F1 provides macro coverage and on F2, radio remote heads (RRHs) are used to improve throughput at hotspots. Mobility is performed based on F1 coverage. Possible scenario is when F1 and F2 belong to different frequency bands, e.g., F1 = {800 MHz, 2 GHz} and F2 = {3.5 GHz}, etc. F2 RRH cells are expected to be able to aggregate with the underlying F1 macro cell.

[0058] In current specifications, the minimum UE transmit maximum power P CMAX_L,c is evaluated by the UE per time slot per subframe. In some aspects, the final P CMAX_L,c value will be the minimum of the two time slots within a subframe. This makes sense when the minimum resource unit is 1 RB (corresponding to a 1 ms TTI value). With the introduction of shortened TTI features, UEs will be scheduled on a smaller TTI basis. When a UE is configured with a shorter TTI, there is no rule for estimating Pcmax. SUMMARY

[0059] To address the foregoing problems with existing solutions, systems and methods are disclosed for deriving a configured output power with different transmission time index (TTI) modes.

[0060] According to certain embodiments, a method for determining a maximum output power by a wireless device is provided. The method includes obtaining, by the wireless device, a first time resource for transmitting a first signal in a first cell on a first carrier and a second time resource for transmitting a second signal in a second cell on a second carrier. Based on the first time resource and the second time resource, a maximum output power is determined. The first signal and the second signal are transmitted based on the determined maximum output power.

[0061] According to certain embodiments, a wireless device for determining a maximum output power is provided. The wireless device includes a memory storing instructions, and a processor configured to execute the instructions to cause the wireless device to obtain a first time resource for transmitting a first signal in a first cell on a first carrier and a second time resource for transmitting a second signal in a second cell on a second carrier. Based on the first time resource and the second time resource, the wireless device determines a maximum output power. Based on the determined maximum output power, the wireless device transmits the first signal in the first cell and the second signal in the second cell.

[0062] According to certain embodiments, a method for determining a maximum output power by a network node is provided. The method includes configuring a wireless device with a first time resource for transmitting a first signal in a first cell on a first carrier and a second time resource for transmitting a second signal in a second cell on a second carrier. Based on the first time resource and the second time resource, a maximum output power is determined. Based on the maximum output power, at least one of the first signal on the first cell and the second signal on the second cell is received.

[0063] According to certain embodiments, a network node for determining a maximum output power is provided. The network node includes a memory storing instructions, and a processor configured to execute the instructions to cause the network node to configure a wireless device with a first time resource for transmitting a first signal in a first cell on a first carrier and a second time resource for transmitting a second signal in a second cell on a second carrier. Based on the first time resource and the second time resource, the network node determines a maximum output power. Based on the maximum output power, the network node receives at least one of the first signal on the first cell and the second signal on the second cell.

[0064] Certain embodiments of the present disclosure can provide one or more technical advantages. For example, certain embodiments can provide well-defined wireless device behavior with respect to configured transmit power. As another example, a technical advantage can be that wireless device behavior with respect to configured transmit power is well-defined when different TTI patterns are used in different carriers in CA operation. As yet another example, a technical advantage can be that operations related to signal transmission by a wireless device configured with same or different TTIs on different serving cells in CA are enhanced.

[0065] Other advantages will be apparent to those of ordinary skill in the art. Certain embodiments can have none, some, or all of the listed advantages. BRIEF DESCRIPTION OF DRAWINGS

[0066] For a more complete understanding of the disclosed embodiments and their features and advantages, reference is now made to the following description, taken in conjunction with the accompanying drawings, in which:

[0067] Figure 1 FIGURE illustrates an example LTE time domain structure;

[0068] Figure 2 FIGURE illustrates an example downlink subframe;

[0069] Figure 3 FIGURE illustrates an example 7-symbol sTTI structure supported for UL;

[0070] Figure 4 FIGURE illustrates an example 4-symbol sTTI supported for UL;

[0071] Figure 5A-5D FIGURE illustrates an example carrier aggregation scenario;

[0072] Figure 6A-6B FIGURE illustrates an example carrier aggregation deployment scenario;

[0073] Figure 7 FIGURE illustrates an example network for deriving configured output power for different TTI patterns for carrier aggregation, in accordance with certain embodiments;

[0074] Figure 8A-8C FIGURE illustrates an example TTI structure in carrier aggregation;

[0075] Figure 9 FIGURE illustrates an example scheduling involving uplink and downlink;

[0076] Figure 10 FIGURE illustrates an example wireless device for deriving maximum output power, in accordance with certain embodiments;

[0077] Figure 11 FIGURE illustrates an example method for deriving maximum output power by a wireless device, in accordance with certain embodiments;

[0078] Figure 12 FIGURE illustrates an example when using 14-OS and 7-OS TTIs in two cells involved in a carrier aggregation combination, according to certain embodiments;

[0079] Figure 13 FIGURE illustrates an example PCMAX definition when using 14-OS and 7-OS TTIs in two cells involved in a carrier aggregation combination, according to certain embodiments;

[0080] Figure 14 FIGURE illustrates an example PCMAX definition when using 4-OS and 14-OS TTI modes in two cells involved in a carrier aggregation combination, according to certain embodiments;

[0081] Figure 15 FIGURE illustrates an example PCMAX definition when using 14-OS and 7-OS TTI modes in a carrier aggregation combination compared to a slot basis from legacy TTI modes, according to certain embodiments;

[0082] Figure 16 FIGURE illustrates using different TTI lengths;

[0083] Figure 17 FIGURE illustrates another example method for obtaining maximum output power by a wireless device, according to certain embodiments;

[0084] Figure 18 FIGURE illustrates an example virtual computing device for obtaining maximum output power, according to certain embodiments;

[0085] Figure 19 FIGURE illustrates an example network node for obtaining maximum output power, according to certain embodiments;

[0086] Figure 20 FIGURE illustrates an example method for obtaining maximum output power by a network node, according to certain embodiments;

[0087] Figure 21 FIGURE illustrates another example method for obtaining maximum output power by a network node, according to certain embodiments;

[0088] Figure 22 FIGURE illustrates another example virtual computing device for obtaining maximum output power, according to certain embodiments. DETAILED DESCRIPTION

[0089] Particular embodiments are described in the drawings herein Figures 1-22 by like numbers for like and corresponding portions of the various drawings.

[0090] Figure 7This is a block diagram illustrating an embodiment of a network 100 for obtaining maximum output power for different time resources, according to certain embodiments. In a particular embodiment, different time resources may include different transmission time index (TTI) modes.

[0091] Network 100 includes one or more wireless devices 110A-C (which may be interchangeably referred to as wireless device 110 or UE 110) and network nodes 115A-C (which may be interchangeably referred to as network node 115 or eNodeB 115). Wireless device 110 can communicate with network node 115 via a wireless interface. For example, wireless device 110A can transmit wireless signals to or / or receive wireless signals from one or more network nodes 115. The wireless signals may contain voice traffic, data traffic, control signals, and / or any other suitable information. In some embodiments, the area covered by the wireless signals associated with network node 115 may be referred to as a cell. In some embodiments, wireless device 110 may have D2D capability. Thus, wireless device 110 may be able to directly receive signals from another wireless device 110 and / or directly transmit signals to another wireless device 110. For example, wireless device 110A may be able to receive signals from and / or transmit signals to wireless device 110B.

[0092] In some embodiments, network node 115 may be connected to a radio network controller (not in...) Figure 7 (As depicted in the image) connected via an interface. The radio network controller can control network node 115 and can provide certain radio resource management functions, mobility management functions, and / or other suitable functions. In some embodiments, the functions of the radio network controller may be included in network node 115. The radio network controller may be connected to the core network node via an interface. In some embodiments, the radio network controller may be connected to the core network node via an interface through an interconnection network. An interconnection network may refer to any interconnection system capable of transmitting audio, video, signals, data, messages, or any combination thereof. An interconnection network may include all or part of the Public Switched Telephone Network (PSTN), public or private data networks, local area networks (LANs), metropolitan area networks (MANs), wide area networks (WANs), local, regional, or global communications or computer networks (e.g., the Internet, wired or wireless networks, corporate intranets), or any other suitable communication link (including combinations thereof).

[0093] In some embodiments, the core network node can manage the establishment of communication sessions and various other functionality for wireless devices 110. Wireless devices 110 can exchange certain signals with the core network node using the non-access stratum layer. In non-access stratum signaling, signals between the wireless devices 110 and the core network node can be transferred transparently through the radio access network. In certain embodiments, the network nodes 115 can interface with one another over an inter-node interface. For example, network nodes 115A and 115B can interface over an X2 interface.

[0094] As described above, example embodiments of the network 100 can include one or more wireless devices 110, and one or more different types of network nodes capable of communicating with the wireless devices 110 (directly or indirectly). A wireless device 110 can refer to any type of wireless device communicating with a node and / or with another wireless device in a cellular or mobile communication system. Examples of a wireless device 110 include a mobile phone, a smart phone, a PDA (Personal Digital Assistant), a portable computer (e.g., laptop, tablet), a sensor, a modem, a machine type communication (MTC) device / machine to machine (M2M) device, laptop embedded equipment (LEE), laptop mounted equipment (LME), USB dongle, a D2D capable device, or another device capable of providing wireless communication. In some embodiments, the wireless device 110 can also be referred to as a UE, a station (STA), a device, or a terminal. Also, in some embodiments, the general term "radio network node" (or simply "network node") is used. It can be any kind of network node which can comprise a Node B, a base station (BS), a multi- standard radio (MSR) radio node such as a MSR BS, an eNode B, a network controller, a radio network controller (RNC), a base station controller (BSC), a relay donor node controlling relay, a base transceiver station (BTS), an access point (AP), a transmission point, a transmission node, RRU, RRH, a node in a distributed antenna system (DAS), a core network node (e.g., MSC, MME, etc.), O&M, OSS, SON, positioning node (e.g., E-SMLC), MDT, or any suitable network node. Example embodiments of wireless devices 110 and network nodes 115 are described in more detail in connection with FIGs. 2 and 3, respectively. Figure 10 and 17 are described in more detail.

[0095] Although Figure 7particular configuration. For example, network 100 can include any suitable number of wireless devices 110 and network nodes 115, as well as any additional elements suitable to support communication between wireless devices or between a wireless device and another communication device (e.g., a fixed line telephone). Furthermore, although certain embodiments can be described as implemented in a Long Term Evolution (LTE) network, the embodiments can be implemented in any suitable type of telecommunication system that supports communication standards and uses any suitable components, and are applicable to any radio access technology (RAT) or multi-RAT systems in which a wireless device receives and / or transmits signals (e.g., data). For example, various embodiments described herein can be applicable to LTE, LTE-Advanced, LTE-U, UMTS, HSPA, GSM, cdma2000, WiMax, WiFi, another suitable radio access technology, or any suitable combination of one or more radio access technologies. Although certain embodiments can be described in the context of wireless transmissions in the downlink, the present disclosure contemplates that various embodiments are equally applicable in the uplink and vice versa. Also, techniques for deriving configured output power with different TTI modes described herein can be applicable to LAA LTE and standalone LTE operation in unlicensed channels and generally to transmissions from network nodes 115 and wireless devices 110.

[0096] As described herein, the terms first node and second node can be used to refer to two nodes that transmit or receive in an unlicensed spectrum (or a shared spectrum, where more than one system operates based on some sharing specification). Either of the above-mentioned nodes can be referred to as a "first node" and / or a "second node."

[0097] A component carrier (CC) (also interchangeably referred to as a carrier, PCC, or SCC) is configured at a wireless device by a network node using higher layer signaling. For example, a CC can be configured by sending an RRC configuration message to the wireless device. The configured CC can be used by the network node to serve the wireless device on a serving cell of the configured CC (e.g., on a PCell, PSCell, SCell, etc.). The configured CC is also used by the wireless device to perform one or more radio measurements (e.g., RSRP, RSRQ, etc.) on cells operating on the CC (e.g., PCell, SCell, or PSCell and neighboring cells).

[0098] The term fallback mode refers herein to a carrier aggregation (CA) configuration that contains fewer CCs than the maximum number of CCs in a CA combination supported by the wireless device 110. For example, a wireless device 110 that supports a CA combination with a maximum CA configuration of 4 DL CCs and 1 UL CC can support the following 3 fallback modes: 3 DL CCs and 1 UL CC, 1 DL CC and 1 UL CC, and 1 DL CC and 1 UL CC (i.e., single carrier operation). The term fallback mode can also be interchangeably called a low order CA combination, a low order CA configuration, a fallback CA mode, a fallback CA configuration mode, a fallback CA combination, etc.

[0099] The term signal used herein can be any physical signal or physical channel. Examples of physical signals are reference signals, e.g., PSS, SSS, CRS, PRS, etc. The term physical channel used herein (e.g., in the context of a channel reception) is also called a channel. Examples of physical channels are MIB, PBCH, NPBCH, PDCCH, PDSCH, sPUCCH, sPDSCH, sPUCCH, sPUSCH, MPDCCH, NPDCCH, NPDSCH, E-PDCCH, PUSCH, PUCCH, NPUSCH, etc.

[0100] The term time resource used herein can correspond to any type of physical resource or radio resource expressed in terms of length of time. Examples of time resources are: symbol, time slot, subframe, radio frame, TTI, interleaving time, etc.

[0101] The term TTI used herein can correspond to an arbitrary period of time (TO) in which a physical channel can be encoded and interleaved for transmission. The physical channel is decoded by a receiver in the same period of time (TO) in which it was encoded. A TTI can also be interchangeably called a short TTI (sTTI), transmission time, transmission time interval, time slot, sub-slot, mini-slot, short subframe (SSF), mini-subframe, etc.

[0102] The term Pcmax used herein can correspond to any parameter that defines the maximum output power of a UE. In some embodiments, Pcmax is denoted by P1. The parameter can be predefined or configured. The parameter can be equal to or less than the nominal output power of the UE. Pcmax can also be interchangeably called UE maximum transmit power, UE maximum configured power, UE maximum operating power, etc. herein.

[0103] The term requirements as used herein can include any type of wireless device requirements related to wireless device measurements, also called radio requirements, measurement requirements, RRM requirements, mobility requirements, positioning measurement requirements, etc. Examples of wireless device requirements related to wireless device measurements are measurement time, measurement reporting time or delay, measurement accuracy (e.g. RSRP / RSRQ accuracy), number of cells measured within a measurement time, etc. Examples of measurement time requirements are L1 measurement period, cell identification time or cell search delay, CGI acquisition delay, etc.

[0104] In certain embodiments, the wireless device 110 can be configured with different time resources, e.g. different TTI lengths or patterns. In one example scenario, the wireless device 110 can be configured with at least two serving cells (e.g. PCell, SCell, etc.), also called carrier aggregation or multi-carrier operation. The wireless device 110 can have the capability of at least two different TTIs (e.g. TTI of 1 ms and TTI of 2-OS, etc.). The wireless device 110 can be configured with any one of the multiple TTIs supported by the wireless device 110 in different serving cells. For example, the wireless device 110 can be configured with TTI=1 for operation on the PCell and SCell or TTI=2-OS for operation on the PCell and SCell.

[0105] In certain embodiments, the wireless device 110 can also be configured with any different TTI in different serving cells. For example, the wireless device 110 can be configured with TTI=1 and TTI=7-OS for operation on the PCell and SCell, respectively.

[0106] In certain embodiments, the wireless device 110 can further be capable of supporting operation with TTI changing over time in one or more serving cells of the wireless device 110. Additionally or alternatively, the wireless device 110 can further be capable of supporting operation with different TTIs in uplink and downlink of any one or more of its serving cells. Examples of basic scenarios are described in Table 1:

[0107]

[0108] Figure 8A-8C Examples of different TTI patterns in different uplink carriers in an uplink carrier aggregation network are illustrated according to certain embodiments. The currently used TTI length consists of 14 OFDM symbols. In case of a shortened TTI, the TTI length can be reduced to a defined number smaller than 14, e.g. 2 OFDM symbols or 7 OFDM symbols. These examples are indicated as 2-OS sTTI and 7-OS sTTI, respectively.

[0109] Different TTI lengths can be configured in different directions, i.e. different TTI lengths between downlink and uplink, or the TTI length can be the same in uplink and downlink. The different TTI lengths can be different shortened TTI lengths or can be the current TTI length (14 symbols) and a shortened TTI length. For example, the downlink and uplink TTI lengths {DL; UL} can be {2, 2}, {7, 7} or {2, 7}.

[0110] Figure 8A-8C An example of different TTI lengths on component carriers (CC1, CC2) for carrier aggregation transmission is illustrated. In Figure 8A CC1 has a TTI of 1 ms, which is split into two slots #0 and #1, and CC2 has sTTI of 2 OFDM symbols and 3 OFDM symbols. In Figure 8B CC1 has a TTI of 1 ms, which is split into two slots #0 and #1, and CC2 has sTTI of 7 OFDM symbols. In Figure 8C CC1 has sTTI of 7 OFDM symbols, and CC2 has sTTI of 2 OFDM symbols and 3 OFDM symbols.

[0111] For uplink CA, the UL carriers can have the same length within the same PUCCH group. Alternatively, different sTTI lengths can be configured in different PUCCH groups. Different combinations are considered below.

[0112] Figure 9 An example of uplink grant for uplink transmission timing is illustrated according to certain embodiments. The UL grant (UL G) sent in the DL will grant the UL transmission (UL Tx). Because Figure 9 the decoding of the UL grant and the preparation of the UL transmission will take some time, the UL transmission is specified to occur after a specified period. As an example for LTE and 2-OS sTTI, it is assumed that this processing time is 3 sTTI periods (also referred to as N+4 timing). In some cases, the processing time can alternatively be 5 sTTI periods (also referred to as N+6 timing). The time interval between UL Txs can be set to 2 sTTI. If a second UL transmission will not be scheduled, there is no reason for the UE to keep the RF components and PA on to maintain the phase reference.

[0113] Figure 10An example wireless device 110 for deriving maximum output power for different time resources (e.g., different TTI lengths or patterns) in carrier aggregation is illustrated in accordance with certain embodiments. As depicted, the wireless device 110 includes a transceiver 210, a processor 220, and a memory 230. In some embodiments, the transceiver 210 facilitates transmitting wireless signals to and receiving wireless signals from a network node 115 (e.g., via an antenna), the processor 220 executes instructions to provide some or all of the functionality described above as being provided by the wireless device 110, and the memory 230 stores the instructions executed by the processor 220. Examples of the wireless device 110 are provided above.

[0114] The processor 220 can comprise any suitable combination of hardware and software implemented in one or more modules to execute instructions and manipulate data to perform some or all of the described functions of the wireless device 110. In some embodiments, the processor 220 can include, for example, one or more computers, one or more central processing units (CPUs), one or more microprocessors, one or more applications, processing circuitry, and / or other logic.

[0115] The memory 230 is generally operable to store instructions (e.g., computer programs, software, applications, including one or more of logic, rules, algorithms, code, tables, etc.) and / or other instructions capable of being executed by the processor. Examples of memory 230 include computer memory (for example, Random Access Memory (RAM) or Read Only Memory (ROM)), mass storage media (for example, a hard disk), removable storage media (for example, a Compact Disk (CD) or a Digital Video Disk (DVD)), and / or any other volatile or non-volatile, non-transitory computer-readable and / or computer- executable memory devices that store information.

[0116] Other embodiments of the wireless device 110 can include additional components Figure 10 that are not shown in the example of FIGURE 2, which can be responsible for providing certain aspects of the wireless device's functionality, including any of the functionality described above and / or any additional functionality (including any functionality necessary to support the technical solutions described above).

[0117] Figure 11An exemplary method 300 for obtaining maximum output power by a wireless device 110 is illustrated in accordance with certain embodiments. The method starts in step 302 when the wireless device 110 obtains or determines a first TTI for operating a first signal (SI) between a first cell on a first carrier and the wireless device 110 and a second TTI for operating a second signal (S2) between a second cell on a second carrier and the wireless device 110. In certain embodiments, the configuration of the first TTI can be performed by receiving a message from a network node 115. In particular embodiments, for example, the message can comprise a RRC message.

[0118] The first cell can be a serving cell of the wireless device 110. Examples of a serving cell are a PCell, a PSCell, and other cells. A serving cell can be enabled or disabled. In case the first cell corresponds to an uplink (UL) serving cell, the first TTI corresponds to a TTI of the UL serving cell.

[0119] The term operating a signal (also referred to as the first signal (SI)) between the first cell and the wireless device 110 herein can include reception of a signal (SI 1) by the UE from the first cell and / or transmission of a signal (SI 2) by the wireless device 110 to the first cell. Examples of SI 1 when receiving a signal from the first cell at the wireless device 110 are DL channels, such as PDCCH, PDSCH, sPDCCH, sPDSCH, and other suitable DL channels. Examples of SI 2 when transmitting a signal by the wireless device 110 to the first cell are UL channels, such as PUCCH, PUSCH, sPUCCH, sPUSCH, and other suitable UL channels.

[0120] In certain embodiments, the wireless device 110 can determine the first TTI based on one or more of the following principles:

[0121] Predefined information, such as a relationship between the first TTI and the first frequency band;

[0122] Configuration received from a network node 115. For example, the UE can determine the TTI mode used in any carrier at any time instance by receiving a control signal in the DL or by receiving a RRC message.

[0123] Predefined rules. Examples of rules are:

[0124] Apply the same TTI as used in a reference cell. The reference cell can comprise a PCell, a PSCell, or another suitable reference cell.

[0125] Based on the TTI used in the opposite direction of the first cell. For example,

[0126] Assume the same TTI in UL and DL cells.

[0127] Assume that UL cell1 uses a TTI that is no shorter than that of DL cell1.

[0128] Such as automatically determining, for example, through blind detection (by wireless device 110 by attempting to decode the DL channel for different predefined TTIs).

[0129] In step 302, the wireless device 110 also obtains or determines a second TTI, which is used to operate a second signal between the second cell and the wireless device 110 on the second carrier. The second cell may be the serving cell of the wireless device 110. Examples of serving cells are again PCell, SCell, PSCell, etc. The serving cell may be enabled or disabled. In cases where, for example, the first cell corresponds to a UL serving cell, the second TTI may correspond to the TTI of the serving cell.

[0130] Operational signals between the second cell and the wireless device 110 may include signals (S21) received by the wireless device 110 from the second cell and / or signals (S22) transmitted by the wireless device 110 to the second cell. Examples of S21 when the wireless device 110 receives signals from the first cell are DL channels, such as PDCCH, PDSCH, sPDCCH, sPDSCH, etc. Examples of S22 when the wireless device 110 transmits signals to the first cell are UL channels, such as PUCCH, PUSCH, sPUCCH, sPUSCH, and other suitable UL channels.

[0131] In some embodiments, the wireless device 110 may determine the second TTI based on one or more of the mechanisms described above for obtaining or determining the first TTI for operation in the first cell. In some embodiments, the wireless device may use the same principles as described above for determining the TI of any number of cells (including a third cell, a fourth cell, etc.). Thus, various embodiments are applicable when the wireless device 110 is configured with any number of TTIs for operation of any number of serving cells.

[0132] At step 304, the wireless device 110 determines a maximum output power parameter (P1) based on the determined values of the first TTI and the second TTI. The estimation of P1 can be made within a certain window or duration (Tw), which depends on at least the first TTI and the second TTI used by the wireless device 110 for transmitting signals at least in its serving cells (first and second cells), respectively. The parameter Tw can also be referred to as a reference time, a reference TTI length or window, a TTI reference (TTIref), a Pcmax reference time, an estimation period of maximum power, etc.

[0133] More specifically, the value Tw used for calculating or estimating P1 is a function of the first TTI1 and the second TTI2 used by the wireless device 110 in the UL of the first cell and in the UL of the second cell, respectively. This can be expressed by the following expression:

[0134]

[0135] wherein

[0136] In an example, the function of TTI1 and TTI2 selects one of the lengths of TTI1 or TTI2, e.g. the longer one. As a further example embodiment, the value of Tw is selected as a fraction of TTI1 and / or TTI2. For example, the value Tw is selected as half of the TTI duration of the longest of TTI1 or TTI2. Alternatively, the value Tw is selected as another fraction of TTI1 and / or TTI2. The value of Tw can be based on the longer of TTI1 and TTI2, or based on another criterion using one or both of TTI1 and / or TTI2 (or any other TTI). In some aspects, the value of Tw is configured as the entire length value of TTI1 and / or TTI2. In some examples, the value of Tw can be determined as 7 OFDM symbols or another predetermined value, e.g. if the longest length of TTI is equal to or larger than 7 OFDM symbols or the predetermined value. The examples above can be applicable to any number of TTIs, and can be considered to be generally applicable to multiple TTI lengths. The function determining Tw can determine a length different from TTI1 or TTI2. Information indicating the value of Tw or parameters or information set for generating Tw can be determined by the wireless device, or signaled to the wireless device from a network node, or the value of Tw can be determined by the wireless device based on a predetermined value or derived from some other signal or configuration of the wireless device.

[0137] In certain other embodiments, the value of Tw can depend on: the TTI used in the UL (TTI1u) and the TTI used in the DL (TTI1d) in the first cell, the TTI used in the UL (TTI2u) in the second cell, and the TTI used in the DL (TTI2d) in the second cell by the wireless device. For example, Tw can be expressed using the following function:

[0138]

[0139] The principles or rules above can apply to any number of serving cells configured for the wireless device 110. The value of Tw for any example can be configured as a selected portion or the entire length of the defined length of one TTI or combination of TTIs, e.g., as described above.

[0140] For each set of TTIs for all of its configured serving cells, the wireless device 110 can determine P CMAX_L,c and the value P CMAX,c Several examples are provided below.

[0141] One example of a general function for determining the maximum output power can be expressed by Equation 4:

[0142] (Equation 4)

[0143] In Equation 4, the first TTI (TTI1) and the second TTI (TTI2) are the TTIs used in the UL of the first cell (cell1) and the UL of the second cell (cell2), respectively. As an example embodiment, the values of (P CMAX , P CMAX_L ) can be estimated over a time window (Tw) as a fraction of TTI1 and / or TTI2, e.g., half of the longest applicable TTI duration. The time window used can be determined by any criteria or function, e.g., based on one or more TTI lengths.

[0144] Particular examples of such functions are given in the following description. Such a function will first determine the length over which the UE should evaluate the maximum output power to be used for transmitting a signal.

[0145] If both TTIs have the same length (TT1 = TTI2), the obvious option would be to select that TTI as the timing reference (TTI REF ).

[0146] If the TTIs have different values, one example would be to consider the least common multiple of the two values, as shown in Table 3:

[0147] TTI1 TTI2 TTI REF ]]> 2 OS 4 OS 4 OS 2 OS 7 OS 7 OS(*) 4 OS 2 OS 4 OS 4 OS 7 OS 7 OS(*) 7 OS 2 OS 7 OS(*) 7 OS 4 OS 7 OS(*) 1 ms 2 OS 7 OS(**)

[0148] Table 3: TTI REF Selection of the reference TTI

[0149] Note that even if the shortened TTI is specified as 4 OS, it will change from 3 to 4 OS to always be aligned with the slot and subframe. In a similar manner, the 2 OS TTI will change from 2 to 3 OS.

[0150] (**) Note that the example can be a TTI REF whose length is different from the length of any of the TTIs used (i.e., TTI1 and TTI2).

[0151] In some examples, the evaluation window (TTI REF ) is based on a number of TTIs, for example by selecting the length of the highest length TTI. Alternatively, the TTI REF may be a fraction (e.g., half) of one of the TTI lengths (e.g., the highest length TTI). In some examples, the TTI REF is different from any of the TTI lengths used (e.g., a predetermined value), optionally selected according to the one or more TTI lengths used. In some examples, the TTI REF is a slot (i.e., 7 OFDM symbols).

[0152] Once the TTI REF is determined, the existing requirements specified in TS 36.101 section 6.2.5A will apply for determining the UE maximum output power, instead of evaluating the power every subframe, but in some embodiments power evaluation can be done every TTI REF .

[0153] Figure 12 An example embodiment illustrating the PCMAX definition when using two different TTI patterns in any carrier aggregation combination is shown. Specifically, Figure 12 An example PCMAX definition when using 14-OS and 7-OS patterns is shown. The total configured maximum output power PCMAX can be set within the following bounds:

[0154]

[0155] where

[0156]

[0157] In some embodiments, the P CMAX mentioned above can apply to the reference TTI. For example, the P CMAX mentioned above can apply to the TTI(n) in the first cell and to the TTI(n,0) and TTI(n,1) in the second cell. The P CMAX_L,a(b) and PCMAX_H,a(b) Pcmax,b,c is the Pcmax for cell a on TTI b in slot c CMAX,c lower and upper limits.

[0158] In other embodiments, slot-based PCMAX can be used for 14-OS TTIs (1 ms TTIs) and compared to shorter TTIs, as shown in Figure 12 .

[0159] Figure 13 Figure illustrates PCMAX definition when using two different TTI modes in any carrier aggregation combination. Specifically, Figure 13 Figure depicts PCMAX definition when using 14-OS and 7-OS TTI modes. Comparison on a slot basis is shown from legacy TTI modes.

[0160] As depicted, P CMAX_L may be defined as:

[0161]

[0162] Similarly, P CMAX_H may be defined as:

[0163]

[0164] In both equations above, P CMAX_L,a(b) and P CMAX_H,a(b,c) refer to lower and upper P CMAX for CG a in subframe b and slot c for the first cell.

[0165] Figure 14 Figure illustrates PCMAX definition when using two different TTI modes in any carrier aggregation combination. Specifically, Figure shows PCMAX definition when using 4-OS and 14-OS TTI modes.

[0166] Following the same logic as shown in Figure 12 and subsequent formulas for PCMAX definition, the following can be defined for the example mentioned above:

[0167]

[0168] Another alternative can be to use slot-based PCMAX for 14-OS TTIs (1 ms TTIs) and compare it to shorter TTIs, as shown in Figure 15 . Figure 15 Figure shows P CMAXDefinitions. Specifically, PCMAX definitions are defined for 14-OS and 7-OS TTI modes with comparisons on a slot basis from legacy TTI modes.

[0169] As seen, P CMAX_L may be defined as:

[0170]

[0171] Similarly, P CMAX_H may be defined as:

[0172]

[0173] The examples above can also be extended to other TTI combinations between carriers in any carrier aggregation operation.

[0174] In some examples, different windows (Tw) or reference times can be used for PCMAX evaluation, which are then compared. For example, P CMAX , P CMAX_L , and / or P CMAX_H evaluations can be based on TTI1 and TTI2 (or another reference TTI), and compared to determine P CMAX , P CMAX_L , and / or P CMAX_H for use in determining output power of a wireless device.

[0175] Figure 16 An example is shown using two different TTI modes in any carrier aggregation combination, in this case a 14-OS (1 ms) mode and a 2-OS sTTI mode. The comparison can be based on sTTI groups in a slot 350 (7 OFDM symbols) as defined in legacy TTI modes. Thus, in this example, two slots 350 are shown. In this example, a window (Tw) for 1 ms TTI can be a slot 350.

[0176] Optionally using different windows (Tw), maximum output power parameters P CMAX , P CMAX_L , and / or P CMAX_H may be calculated for different TTIs, and compared to determine P CMAX , P CMAX_L , and / or P CMAX_H to be used. In some examples, different TTIs are used on different carriers. The different TTIs (i.e., TTI instances) can be different lengths and / or consecutive TTIs of the same length. For example, P CMAX , P CMAX_L , and / or P CMAX_HThe smallest one in the group. In this example, a TTI group is those TTIs that are at least partially present in period 350, which may or may not correspond to a window (Tw). For example, a group includes a 1ms TTI evaluated within the length of time slot 350 (i.e., the period), and sTTIs within the same period (e.g., time slot 350), namely TTI(n), TTI(n+1), and TTI(n+2).

[0177] for Figure 16 The configuration in the image shows the total maximum output power P. CMAX It will be set within the following limits:

[0178]

[0179] in

[0180]

[0181] In this example, TTI(m, s0) refers to the 1ms TTI in time slot #0, for its P CMAX_L or P CMAX_H This is in cell / carrier 1. P is also evaluated for TTI(n), TTI(n+1), and TTI(n+2). CMAX The value of .

[0182] In this example, P mentioned above CMAX This applies to the reference TTI, specifically TTI(n, s0) in cell1 (i.e., slot #0), and TTI(n), TTI(n+1), and TTI(n+2) in cell2. P CMAX_L,a(b) and P CMAX_H,a(b) These are P values ​​for cell a on TTI b. CMAX,c Lower and upper limits. In this example, the smallest parameter from the group being evaluated is selected. Evaluation can be performed over the same and / or different time windows. Optionally, a threshold P can be included in the group. PowerClass This provides the minimum value for the selected parameter.

[0183] The corresponding formula applies to slot #1 of 1ms TTI, such as 1ms TTI(m, s1) on cell1 and TTI(n+3), TTI(n+4) and TTI(n+5) on cell2.

[0184] The parameters can be determined by the wireless device. Optionally, the indicator defines P as described above. CMAX The information about the parameters can be transmitted to the wireless device by the network node using signals, or determined by the wireless device based on other received signaling or configuration of the wireless device (e.g., received from the network node).

[0185] returnFigure 11 At step 306, the wireless device 110 uses the determined maximum output power value for the determined TTI determined from step 304 to transmit the first signal (SI) and the second signal (S2) to the first cell (celli) and the second cell (cell2), respectively.

[0186] According to certain embodiments, the following sections in 3GPP TS 36.133 v14.1.0 can be modified. The new changes are covered in the following sections in 3GPP TS 36.133 v14.1.0.

[0187] 6.2.5A Configured transmit power for CA

[0188] For uplink carrier aggregation, the UE is allowed to set its configured maximum output power for a serving cell c, and its total configured maximum output power P CMAX .

[0189] The configured maximum output power for a serving cell c, P CMAX,c is set as specified in subclause 6.2.5.

[0190] For uplink inter-band carrier aggregation, MPR c and A-MPR c apply per serving cell c and are specified in subclauses 6.2.3 and 6.2.4, respectively. P-MPR c Power management for a serving cell c is described. P CMAX,c .

[0191] For uplink intra-band contiguous and non-contiguous carrier aggregation, MPR c = MPR and A-MPR c = A-MPR, where MPR and A-MPR are specified in subclauses 6.2.3A and 6.2.4A, respectively. There is one power management term for the UE, denoted as P-MPR, and P-MPR c = P-MPR. P CMAX,c .

[0192] The total configured maximum output power P CMAX is set within the following limits:

[0193]

[0194] For uplink inter-band carrier aggregation with one serving cell per operating band,

[0195]

[0196]

[0197] in

[0198] - p EMAX,c It is P EMAX,c The linear value is given by the IEP-Max of serving cell c in [7];

[0199] - P PowerClass This refers to the maximum UE power specified in Table 6.2.2A-1, without considering the tolerances specified in Table 6.2.2A-1; p PowerClass It is P PowerClass The linear value;

[0200] - mpr c and a-mpr c These are the MPRs specified in sub-clauses 6.2.3 and 6.2.4, respectively. c and A-MPR c The linear value;

[0201] - pmpr c It is P-MPR c The linear value;

[0202] - Note 2 in Table 6.2.2-1 applies when it applies to serving cell c. yes The linear value, otherwise ;

[0203] - This refers to the inter-band relaxation term of service cell c as specified in Table 6.2.5-2. linear value; otherwise ;

[0204] - yes The linear value and as specified in sub-clause 6.2.5.

[0205] For uplink in-band continuous and discontinuous carrier aggregation

[0206]

[0207]

[0208] in

[0209] - p EMAX,c It is P EMAX,clinear value of P EMAX,c , given by the IE P-Max of the serving cell c in [7];

[0210] - P PowerClass is the maximum UE power not taking into account the tolerance specified in Table 6.2.2A-1;

[0211] - MPR and A-MPR are specified in subclause 6.2.3A and subclause 6.2.4A, respectively;

[0212] - is the additional tolerance of the serving cell c as specified in Table 6.2.5-2;

[0213] - P-MPR is the power management entry for the UE;

[0214] - is the highest value among all serving cells c in the subframes within two time slots . Note 2 in Table 6.2.2A-1 applies for the serving cell c, , otherwise ;

[0215] - as specified in subclause 6.2.5 applies.

[0216] For the combination of intra- and inter-band carrier aggregation with up to two contiguous aggregated carriers per operating band for which the UE is configured to transmit on three serving cells,

[0217]

[0218] where

[0219] - p EMAX,c is the linear value of P EMAX,c , given by the IE P-Max of the serving cell c in [7];

[0220] - P PowerClass is the maximum UE power not taking into account the tolerance specified in Table 6.2.2A-0; p PowerClass is the linear value of P PowerClass ;

[0221] -p CMAX_L,Bi is the linear value of P CMAX_L as specified in the corresponding operating band. P CMAX_L,c specified for single carrier in subclause 6.2.5 applies for an operating band supporting one serving cell. P CMAX_L specified for uplink intra-band contiguous carrier aggregation in subclause 6.2.5A applies for an operating band supporting two serving cells.An operating frequency band suitable for supporting two contiguous serving cells.

[0222] T REF and T eval have values specified in Table 6.2.5-0A. For each T REF , P eval is evaluated every T CMAX_L and is given by the minimum value taken over the transmissions within T eval ; the minimum P REF over T CMAX_L applies for the entire T REF . P PowerClass will not be exceeded by the UE during any period.

[0223] Table 6.2.5A-0A: P CMAX evaluation window

[0224]

[0225] In some aspects, the reference time can refer to a reference period (T REF in the tables above, or independently, the evaluation time (T eval ) in the tables above). In some aspects, determining the maximum output power includes determining a maximum output power parameter for a reference time as an evaluation period, the maximum output power parameter being evaluated per reference period (i.e., within the evaluation time T REF ). The reference time is based on a length of the first time source and / or the second time source. In some aspects, the maximum output power parameter can apply for the reference period (T REF ), which is based on a length of the first time source and / or the second time source. The evaluation time and the reference time can be the same (as shown in the tables above) or different.

[0226] If the UE is configured with multiple TAGs and the transmission by the UE on T REF i overlaps with some portion of the first symbol of the transmission on T REF i and T REF i for the UE minimum of P CMAX_L applies to T REF i and T REF i for any overlapping portion. P PowerClass will not be exceeded by the UE during any period.

[0227] Pmax the maximum output power measured on all serving cells UMAX shall be within the following ranges:

[0228]

[0229] where p UMAX,c denotes the measured maximum output power of a serving cell c expressed in linear scale. For P CMAX applicable values of T LOW (P CMAX ) and T HIGH (P CMAX ) are specified in Table 6.2.5A-1 for inter-band carrier aggregation and in Table 6.2.5A-2 for intra-band carrier aggregation, respectively. The tolerance T L is the absolute value of the lower tolerance for applicable E-UTRA CA configurations as specified in Table 6.2.2A-0 (for inter-band carrier aggregation), Table 6.2.2A-1 (for intra-band contiguous carrier aggregation) and Table 6.2.2A-2 (for intra-band non-contiguous carrier aggregation), respectively.

[0230] Table 6.2.5A-1: P CMAX Tolerance

[0231]

[0232] Table 6.2.5A-2: P CMAX Tolerance

[0233]

[0234] Figure 17An exemplary method 400 for obtaining maximum output power by a wireless device 110 according to certain embodiments is illustrated. The method starts at step 402 when the wireless device 110 obtains a first time resource for transmitting a first signal in a first cell on a first carrier. At step 404, the wireless device also obtains a second time resource for transmitting a second signal in a second cell on a second carrier. In certain embodiments, the first time resource is a first TTI and the second time resource is a second TTI. The first time resource has a first TTI length and the second TTI has a second TTI length. The first TTI length can be the same or different. In certain embodiments, at least one of the first TTI and the second TTI can be a short TTI, i.e., less than 1 ms. In some aspects, one of the first TTI and the second TTI is a short TTI (e.g., 2, 3, 4, or 7 symbol sTTI) and the other of the first TTI and the second TTI is 1 ms (i.e., 14 symbol TTI). In another example, the first TTI and the second TTI are different length short TTIs, e.g., 2 and 7 symbol TTIs, respectively. In another embodiment, the first time resource is referred to as a first mini-slot and the second time resource is a second mini-slot. Corresponding examples apply to this terminology.

[0235] According to certain embodiments, the first cell can be an uplink serving cell of the wireless device 110. In certain embodiments, for example, the uplink serving cell is a primary cell or a secondary cell.

[0236] According to certain embodiments, at least one of the first time resource and the second time resource can be obtained based on at least one corresponding characteristic. In various certain embodiments, for example, the at least one characteristic can include one or more of a relationship between the first time resource and a first frequency band, a configuration received from a network node, a predefined rule, and a blind detection.

[0237] At step 406, the wireless device 110 determines a maximum output power based on the first time resource and the second time resource. According to certain embodiments, determining the maximum output power can comprise determining a reference time based on at least one of the first time resource and the second time resource and determining the maximum output power based on the reference time. In particular embodiments, the reference time can be one time slot, one mini-slot, 2 OS, 4 OS, or 7 OS. In particular embodiments, the reference time can be determined as a function of a length of at least one of the first time resource and the second time resource. For example, the reference time can be a least common multiple of a length of the first time resource and a length of the second time resource, a highest value of the length of the first time resource and the length of the second time resource, a fraction of the length of the first time resource or the length of the second time resource, half of the length of the first time resource or the length of the second time resource, a fraction of a highest value of the length of the first time resource or the length of the second time resource, half of a highest value of the length of the first time resource or the length of the second time resource, or a value configured for at least one of the first time resource and the second time resource.

[0238] According to certain embodiments, determining the maximum output power can comprise determining a maximum output power parameter P CMAX_L , and the reference time is an evaluation period, wherein the maximum output power parameter is evaluated every reference period (T eval). The reference time can be based on a length of the first time resource and / or the second time resource. In particular embodiments, the maximum output power parameter can be a lower bound of a configured maximum output power (P CMAX_L ).

[0239] According to particular embodiments, the reference time can be determined based on multiple evaluations of the power parameter for different values of the first time resource and the second time resource. For example, the reference time can be determined by performing a comparison of the reference time for multiple different lengths of the first time resource and the second time resource. In particular embodiments, each of the multiple evaluations of the power parameter can be evaluated within the same period (T eval ) as the reference time. In another embodiment, each of the multiple evaluations of the power parameter can be performed within a different period (T eval ) than the reference time. Thus, it is recognized that according to particular embodiments, the period (T eval ) within which the evaluation is performed and the reference time can be independently determined and can be the same or different.

[0240] According to still other embodiments, the first reference time can be determined based on the first time resource and the second reference time can be determined based on the second time resource. The maximum output power can then be determined based on the first reference time and the second reference time. In certain embodiments, the first reference time can be different than the second reference time. In another embodiment, the first reference time can be the same as the second reference time.

[0241] At step 408, the wireless device transmits a first signal to the first cell and a second signal to the second cell based on the determined maximum output power. In certain embodiments, the first signal can be transmitted to the first cell on a physical uplink control channel (PUCCH), a physical uplink shared channel (PUSCH), a short physical uplink control channel (sPUCCH), or a short physical uplink shared channel (sPUSCH).

[0242] In certain embodiments, the method for deriving a maximum output power as described above can be performed by a virtual computing device. Figure 18 FIG. 13 illustrates an example virtual computing device 1300 for deriving a maximum output power according to certain embodiments. In certain embodiments, the virtual computing device 1300 can include modules for performing similar steps as those described above in relation to the methods illustrated or described in FIGS. 1-12. Figure 11 For example, the virtual computing device 1300 can include at least one obtaining module 1310, at least one determining module 1320, at least one transmitting module 1330, and any other suitable modules for deriving a maximum output power with different TTI patterns. In some embodiments, one or more of the modules can be implemented using one or more processors 220 of the virtual computing device 1300. In certain embodiments, the functionality of two or more of the various modules can be combined into a single module. Figure 10

[0243] ​The acquisition module 410 can perform the acquisition function of the virtual computing device 400. For example, in a particular embodiment, the acquisition module 410 can acquire a first time resource for transmitting a first signal in a first cell on a first carrier. Additionally, the acquisition module 410 or another acquisition module can acquire a second time resource for transmitting a second signal in a second cell on a second carrier. In a particular embodiment, for example, the acquisition module 410 can acquire or determine a first TTI for operating a first signal between the first cell and the wireless device 110 on the first carrier (S1), and a second TTI for operating a second signal between the second cell and the wireless device 110 on the second carrier (S2). In some embodiments, the configuration of the first TTI can be performed by receiving a message from the network node 115. In a particular embodiment, for example, the message may include an RRC message. For example, in a particular embodiment, the determination module 420 can perform the determination function of the virtual computing device 400. For example, in a particular embodiment, the determination module 420 can determine a maximum output power parameter (P1) based on determined values ​​of a first time reference and a second time reference. The estimation of P1 can be performed within a reference time, which can be referred to as a window or duration (Tw), depending on the at least first time reference and second time reference used by the wireless device 110 to transmit signals in its serving cells (first cell and second cell). The parameter Tw can also be referred to as reference time, reference TTI length or window, TTI reference (TTIref), Pcmax reference time, maximum power estimation period, etc.

[0244] The transmission module 430 can perform the transmission function of the virtual computing device 400. For example, in a particular embodiment, the transmission module 430 can use the determined maximum output power parameter (P1) to transmit the first signal (S1) and the second signal (S2) to the first cell (cell1) and the second cell (cell2), respectively.

[0245] Other embodiments of the virtual computing device 400 may include Figure 18 Additional components beyond those shown may be responsible for providing certain aspects of the functionality of the radio node, including any of the functionalities described above and / or any additional functionalities (including any functionality necessary to support the technical solutions described above). Various types of wireless devices 110 and network nodes 115 may include components having the same physical hardware but configured (e.g., via programming) to support different radio access technologies, or may represent partially or completely different physical components.

[0246] Figure 19Figure illustrates an example network node 115 for deriving configured output power with different TTI modes, according to certain embodiments. As described above, the network node 115 can be any type of radio network node or any network node in communication with a wireless device and / or with another network node. Examples of the network node 115 are provided above.

[0247] The network nodes 115 can be deployed throughout the network 100 as a homogeneous deployment, a heterogeneous deployment, or a mixed deployment. A homogeneous deployment can generally describe a deployment consisting of the same (or similar) types of network nodes 115 and / or similar coverage and cell sizes and inter-site distances. A heterogeneous deployment can generally describe a deployment that uses various types of network nodes 115 with different cell sizes, transmission power, capacities, and inter-site distances. For example, a heterogeneous deployment can include a number of low power nodes deployed throughout a macro cell layout. A mixed deployment can include a mix of homogeneous and heterogeneous portions.

[0248] The network node 115 can include one or more of a transceiver 510, a processor 520, a memory 530, and a network interface 540. In some embodiments, the transceiver 510 facilitates transmitting wireless signals to and receiving wireless signals from the wireless devices 110 (e.g., via an antenna), the processor 520 executes instructions to provide some or all of the functionality described above as being provided by the network node 115, the memory 530 stores the instructions executed by the processor 520, and the network interface 540 communicates signals to backend network components, such as a gateway, switch, router, Internet, Public Switched Telephone Network (PSTN), core network nodes, or radio network controllers, etc.

[0249] In certain embodiments, the network node 115 can be capable of using multiple antenna technology and can be equipped with multiple antennas and capable of supporting MIMO technology. The one or more antennas can have controllable polarization. That is, each element can have two co-located sub-elements with different polarization (e.g., 90 degrees separation as in cross-polarization), such that different sets of beamforming weights will give different polarizations to the transmitted wave.

[0250] The processor 520 can include any suitable combination of hardware and software implemented in one or more modules to execute instructions and manipulate data to perform some or all of the described functions of the network node 115. In some embodiments, the processor 520 can include, for example, one or more computers, one or more central processing units (CPUs), one or more microprocessors, one or more applications, processing circuitry, and / or other logic.

[0251] Memory 530 is generally operable to store instructions, such as a computer program, software, an application including one or more of logic, rules, algorithms, code, tables, etc., and / or other instructions capable of being executed by a processor. Examples of memory 530 include computer memory (for example, Random Access Memory (RAM) or Read-Only Memory (ROM)), mass storage media (for example, a hard disk), removable storage media (for example, a Compact Disk (CD) or a Digital Video Disk (DVD)), and / or or any other volatile or non-volatile, non-transitory computer-readable and / or computer- executable memory devices that store information.

[0252] In some embodiments, network interface 540 is communicatively coupled to processor 520 and can refer to any suitable device operable to receive input for network node 115, send output from network node 115, perform suitable processing of the input or output or both, communicate to other devices, or any combination of the preceding. Network interface 540 can include appropriate hardware (for example, port, modem, network interface card, etc.) and software, including protocol conversion and data processing capabilities, to communicate through a network.

[0253] Other embodiments of network node 115 can include additional components Figure 19 other than those shown in FIG. 5 that can be responsible for providing certain aspects of the radio network node's functionality, including any of the functionality described above and / or any additional functionality not shown in FIG. 5. Various different types of network nodes can include components having the same physical hardware but configured (for example, via programming) to support different radio access technologies, or can represent partly or entirely different physical components.

[0254] Figure 20 FIG. 5 illustrates an exemplary method 600 used by network node 115 to achieve maximum output power with different time resources, according to certain embodiments. The method starts at step 602 when network node 115 configures wireless device 110 with a first TTI (TTI1) for a first signal (S1) between a first cell (cell1) operating on a first carrier (F1) and wireless device 110 and a second TTI (TTI2) for a second signal (S2) between a second cell (cell2) operating on a second carrier (F2) and wireless device 110.

[0255] In certain embodiments, network node 115 can also configure wireless device 110 with multiple TTIs for a corresponding multiple serving cells of wireless device 110. Embodiments can be applicable to any number of TTIs configured for any number of corresponding serving cells of wireless device 110.

[0256] The configuration of the first TTI and the second TTI can be performed by transmitting a message to the wireless device 110. For example, the first TTI and the second TTI can be transmitted in an RRC message. The configuration of the first TTI and the second TTI can be performed via the same or different messages.

[0257] Prior to the configuration, the network node 115 can determine the values of the first TTI and the second TTI or the need to configure the first TTI and the second TTI. For example, the network node 115 can determine the specific values of the first TTI and the second TTI. The network node 115 can determine the values of the first TTI and the second TTI based on one or more of the following principles, for example:

[0258] The capability of the UE to support two or more different TTIs (e.g., TTI = 1 ms and TTI = 0.14 ms) on each serving cell.

[0259] The required UE bit rate on each serving cell (e.g., on the first cell and the second cell).

[0260] The required round trip time (RTT) for delivering data packets between the wireless device 110 and the network node 115 or between wireless devices, e.g., using a shorter TTI in case a shorter RTT is required.

[0261] The location of the wireless device with respect to the serving cell. For example, a shorter TTI is used if the wireless device is close to the serving cell (e.g., when the wireless device 110 is close to the network node serving the first cell (cell 1)).

[0262] At step 604, the network node 115 determines a UE maximum output power parameter (P1) based on the configured values of the first TTI and the second TTI. The parameter P1 is used by the wireless device 110 for transmitting UL signals in the first cell and the second cell.

[0263] In certain embodiments, the network node 115 can determine the value of P1 based on a relationship or mapping between the TTIs and the maximum output power parameter. The mapping can include at least two sets of TTIs for a corresponding set of two serving cells of the wireless device 110 and corresponding values of an estimation period (also called Pcmax window or reference window) for estimating the maximum output power. The network node 115 can determine the value of P1 using the same principles as described above with respect to the method of the wireless device 110.

[0264] At step 606, the network node 115 receives a first signal (S1) from the wireless device 110 in the first cell within the configured first TTI and / or a second signal (S2) from the wireless device in the second cell within the configured second TTI, where the wireless device 110 transmits power does not exceed the determined value of P1 in the first cell and the second cell.

[0265] In certain embodiments, the network node 115 can further adapt its receiver configuration based on the determined value of P1. For example, if P1 used by the wireless device 110 to transmit signals to the first cell is estimated by the wireless device 110 over a time window that is less than a threshold value (e.g., 300 μβ), the network node 115 can use a more robust receiver for receiving the first signal (S1). But if the value of P1 used by the wireless device 110 to transmit signals to the first cell is estimated by the wireless device 110 over a time window that is not less than a threshold value (e.g., 300 μβ), the network node 115 can use a less robust receiver for receiving the first signal (S1). A more robust receiver can mitigate interference more effectively compared to a less robust receiver. However, a more robust receiver can consume more power and require more processing and complex operations compared to the latter receiver type.

[0266] In certain embodiments, the adaptation of the receiver type will enable the network node 115 to enhance UE coverage.

[0267] In certain embodiments and optionally, the network node 115 can use the determined UE maximum output power value determined at step 604 and / or also use the window (Tw) within which the value of P1 is estimated by the wireless device 110 for performing one or more operational tasks. Examples of tasks are:

[0268] performing radio measurements in the network node,

[0269] adapting TTI of the UE in DL and / or UL in cell 1 and / or cell 2,

[0270] adapting TTI of the UE in cell 1 and / or cell 2 in different time resources,

[0271] power control operations of the UE in cell 1 and / or cell 2,

[0272] transmitting information about the determined value of P1 and / or Tw to other nodes.

[0273] Figure 21FIG. 13 illustrates an exemplary method 1300 for configuring a wireless device 110 with different TTI patterns for output power in carrier aggregation, according to certain embodiments. The method starts at step 1302, when the wireless device 110 receives a first time resource for transmitting a first signal in a first cell on a first carrier from a network node 115. In a particular embodiment, the first time resource can comprise a first transmission time interval (TTI). In another embodiment, the first time resource can comprise a first mini-slot. At step 1304, the wireless device 110 also receives a second time resource for transmitting a second signal in a second cell on a second carrier from the network node 115. In a particular embodiment, the second time resource can comprise a second TTI. In another embodiment, the second time resource can comprise a second mini-slot.

[0274] At step 1306, the wireless device 110 determines a maximum output power based on the first time resource and the second time resource. According to certain embodiments, for example, the wireless device 110 can determine a reference time based on at least one of the first time resource and the second time resource and determine the maximum output power based on the reference time. In a particular embodiment, the reference time can be determined as a function of a length of at least one of the first time resource and the second time resource. As an example, the reference time can be a least common multiple of a length of the first time resource and a length of the second time resource, a highest value of the length of the first time resource and the length of the second time resource, a fraction of the length of the first time resource or the length of the second time resource, half of the length of the first time resource or the length of the second time resource, a fraction of a highest value of the length of the first time resource or the length of the second time resource, half of the highest value of the length of the first time resource or the length of the second time resource, or a value configured for at least one of the first time resource and the second time resource.

[0275] At step 1308, the wireless device 110 receives at least one of the first signal on the first cell or the second signal on the second cell based on the maximum output power.

[0276] According to certain embodiments, the network node 115 can additionally perform one or more operations based on the maximum output power. For example, the network node 115 can receive at least one of a first signal in the first cell or a second signal in the second cell based on the maximum output power. In another particular embodiment, for example, the network node 115 can adapt uplink scheduling of at least one of the first signal in the first cell and the second signal in the second cell. In other embodiments, the network node 115 can perform one or more of the following operations based on the maximum output power: adapting first time resources of a wireless device in a downlink or an uplink in the first cell, adapting second time resources of the wireless device in a downlink or an uplink in the second cell, performing a power control operation of the wireless device in at least one of the first cell and the second cell, transmitting information about the determined value of the maximum output power to another network node, and transmitting information about a reference time determined based on at least one of the first time resources and the second time resources to another network node.

[0277] In certain embodiments, the method for deriving a maximum output power as described above can be performed by a virtual computing device. Figure 22 FIGURE 8 illustrates an example virtual computing device 800 for deriving a maximum output power according to certain embodiments. In certain embodiments, the virtual computing device 800 can include modules for performing steps similar to those described above with respect to the methods illustrated and described in FIGURES 1-7. Figure 20 and 21 In certain embodiments, the virtual computing device 800 can include modules for performing steps similar to those described above with respect to the methods illustrated and described in FIGURES 1-7. For example, the virtual computing device 800 can include at least one configuring module 810, at least one determining module 820, at least one receiving module 830, and any other suitable modules for deriving a configured output power with different TTI patterns. In some embodiments, one or more of the modules can be implemented using one or more processors 520 of the virtual computing device 800. In certain embodiments, the functionality of two or more of the various modules can be combined into a single module. Figure 19

[0278] ​Configuration module 810 can perform configuration functions of virtual computing device 800. For example, in particular embodiments, configuration module 810 can configure wireless device 810 with a first time resource for transmitting a first signal in a first cell on a first carrier. Additionally, configuration module 810 or another configuration module can configure wireless device 810 with a second time resource for transmitting a second signal in a second cell on a second carrier. For example, configuration module 810 can configure wireless device 110 with a first TTI (TTI1) for operating a first signal (S1) between wireless device 110 and a first cell (cell1) on a first carrier (F1) and with a second TTI (TTI2) for operating a second signal (S2) between wireless device 110 and a second cell (cell2) on a second carrier (F2).

[0279] In certain embodiments, configuration module 710 can also configure wireless device 110 with a plurality of TTIs for a corresponding plurality of serving cells of wireless device 110. Embodiments can be adapted for any number of TTIs configured for any number of corresponding serving cells of wireless device 110.

[0280] Determination module 720 can perform determination functions of virtual computing device 700. For example, in particular embodiments, determination module 720 can determine a UE maximum output power parameter (P1) based on the configured values of the first time resource and the second resource. Parameter P1 is used by wireless device 110 for transmitting UL signals in the first cell and the second cell.

[0281] In certain embodiments, determination module 720 can determine the value of P1 based on a relationship or mapping between TTIs and maximum output power parameters. The mapping can include at least two sets of TTIs for a corresponding two sets of serving cells of wireless device 110 and corresponding values of an estimation period (also called a Pcmax window or a reference window) for estimating maximum output power. Network node 115 can determine the value of P1 using the same principles as described above with respect to the method of wireless device 110.

[0282] Reception module 830 can perform reception functions of virtual computing device 800. For example, in particular embodiments, reception module 830 can receive a first signal (S1) from wireless device 110 in the first cell in the configured first time resource and / or a second signal (S2) from wireless device in the second cell in the configured second time resource, where the transmit power of wireless device 110 does not exceed the determined value of P1 in the first cell and the second cell.

[0283] Other embodiments of virtual computing device 700 can include Figure 20Additional components not shown in FIG. 1 can be included in the wireless device 110 and / or network node 115, as is readily appreciated by those of skill in the art. These components can be responsible for providing certain aspects of the functionality of the wireless device 110 and / or network node 115, including any of the functionality described above and / or any additional functionality not described above (including any functionality necessary to support the techniques described above). Various different types of wireless devices 110 and network nodes 115 can include components having the same physical hardware but configured (e.g., via programming) to support different radio access technologies, or can represent partly or entirely different physical components.

[0284] According to certain embodiments, a method is provided for obtaining a configured maximum output power for different TTI modes by a wireless device for carrier aggregation, comprising:

[0285] obtaining or determining (1) a first TTI for operating a first signal between a first cell on a first carrier and the wireless device, and (2) a second TTI for operating a second signal between a second cell on a second carrier and the wireless device;

[0286] determining a maximum output power parameter based on the determined value of the first TTI and the determined value of the second TTI;

[0287] transmitting the first signal to the first cell and the second signal to the second cell based on the determined maximum output power parameter

[0288] Optionally, the first cell comprises a serving cell of the wireless device;

[0289] Optionally, the serving cell comprises a primary cell;

[0290] Optionally, the serving cell comprises a secondary cell;

[0291] Optionally, the first cell comprises an uplink (UL) serving cell;

[0292] Optionally, operating the first signal comprises receiving one or more signals by the wireless device from the first cell, wherein the first signal can be received on a PDCCH, PDSCH, sPDCCH, or sPDSCH;

[0293] Optionally, operating the first signal comprises transmitting one or more signals by the wireless device on the first cell, wherein the first signal can be transmitted on a PUCCH, PUSCH, sPUCCH, or sPUSCH.

[0294] Optionally, operating the first signal comprises transmitting, by the wireless device, one or more signals to the first cell;

[0295] Optionally, the first TTI can be obtained or determined based on at least one characteristic selected from the group consisting of:

[0296] a predefined information, e.g. a relationship between the first TTI and the first frequency band;

[0297] a configuration received from a network node;

[0298] a predefined rule;

[0299] blind detection;

[0300] Optionally, a reference time or window (Tw, TTI REF ) is used for determining the maximum output power parameter. The window can be based on or a function of one or more of the TTI lengths. Optionally, the window has a length determined or obtained as one of: a least common multiple of the TTI lengths, a highest value of the TTI lengths, a fraction of one of the TTI lengths, half of one of the TTI lengths, a fraction (e.g. half) of the highest value of the TTI lengths, or a predetermined value (e.g. 7 OFDM symbols), optionally dependent on the TTI lengths.

[0301] Optionally, the parameter used for configuring the maximum output power is based on a plurality of evaluations of the parameter for different TTI instances. For example, the parameter is based on a comparison of the parameter for a plurality of different TTI lengths and / or a comparison of the parameter for a plurality of different TTIs. Optionally, the parameters compared are evaluated over a certain period, which can be the same or different from the reference time. Optionally, the evaluated parameters are for TTIs on one or more carriers / cells. The reference time can be different for the evaluated TTIs. Optionally, the reference time is one time slot. Optionally, the parameters can be independently evaluated at each reference time. Optionally, the smallest one of the evaluated parameters is selected.

[0302] According to certain embodiments, a wireless device for obtaining configured output power for different TTI modes for carrier aggregation comprises a memory storing instructions, and a processor configured to execute the instructions to cause the processor to:

[0303] obtaining or determining (1) a first TTI for operating a first signal between a first cell on a first carrier and the wireless device and (2) a second TTI for operating a second signal between a second cell on a second carrier and the wireless device;

[0304] determining a maximum output power parameter based on the determined value of the first TTI and the determined value of the second TTI;

[0305] transmitting the first signal to the first cell and the second signal to the second cell based on the determined maximum output power parameter

[0306] Optionally, the first cell comprises a serving cell of the wireless device.

[0307] Optionally, the serving cell comprises a primary cell.

[0308] Optionally, the serving cell comprises a secondary cell.

[0309] Optionally, the first cell comprises an uplink (UL) serving cell.

[0310] Optionally, operating the first signal comprises receiving one or more signals by the wireless device from the first cell, wherein the first signal can be received on a PDCCH, a PDSCH, a sPDCCH or a sPDSCH.

[0311] Optionally, operating the first signal comprises transmitting one or more signals by the wireless device on the first cell, wherein the first signal can be transmitted on a PUCCH, a PUSCH, a sPUCCH or a sPUSCH.

[0312] Optionally, operating the first signal comprises transmitting one or more signals by the wireless device to the first cell.

[0313] Optionally, the first TTI can be obtained or determined based on at least one characteristic selected from the group consisting of:

[0314] a predefined information, e.g. a relationship between the first TTI and a first frequency band;

[0315] a configuration received from a network node;

[0316] predefined rule;

[0317] blind detection;

[0318] Optionally, a reference time or window (Tw, TTI REF ) is used for determining the maximum output power parameter. The window can be based on or a function of one or more of the TTI lengths. Optionally, the window has a length determined or obtained as one of: a least common multiple of the TTI lengths, a highest value of the TTI lengths, a fraction of one of the TTI lengths, half of one of the TTI lengths, a fraction (e.g. half) of the highest value of the TTI lengths, or a predetermined value (e.g. 7 OFDM symbols), optionally dependent on the TTI lengths.

[0319] Optionally, the parameter used for configuring the maximum output power is based on a plurality of evaluations of the parameter for different TTI instances. For example, the parameter is based on a comparison of the parameter for a plurality of different TTI lengths and / or a comparison of the parameter for a plurality of different TTIs. Optionally, the parameters compared are evaluated over a period, which can be the same as or different from the reference time. Optionally, the parameters evaluated are for TTIs on one or more carriers / cells. The reference time can be different for the TTIs evaluated. Optionally, the reference time is one time slot. Optionally, the parameters can be independently evaluated at each reference time. Optionally, the smallest of the evaluated parameters is selected.

[0320] According to certain embodiments, there is provided a method by a network node for obtaining a configured output power for different TTI modes for carrier aggregation, comprising:

[0321] configuring a wireless device with (1) a first TTI for operating a first signal between a first cell on a first carrier and the wireless device and (2) a second TTI for operating a second signal between a second cell on a second carrier and the wireless device;

[0322] determining a maximum output power parameter based on a configured value of the first TTI and a configured value of the second TTI;

[0323] receiving (1) the first signal in the first cell from the wireless device based on the determined maximum output power parameter and / or (2) the second signal in the second cell based on the determined maximum output power parameter;

[0324] Optionally, the method further comprises configuring the wireless device with a plurality of TTIs for a corresponding plurality of serving cells;

[0325] Optionally, the method further comprises transmitting a message to the wireless device, the message comprising an RRC message;

[0326] Optionally, the method further comprises transmitting a first message and a second message to the wireless device, the first message comprising a first TTI, the second message comprising a second TTI;

[0327] Optionally, the method further comprises determining the first value for the first TTI and the second value for the second TTI based on one or more of:

[0328] whether the wireless device supports two or more different TTIs on each serving cell;

[0329] a required UE bit rate on each serving cell

[0330] a required round trip time for delivering data packets between the wireless device and the network node;

[0331] a location of the wireless device relative to the serving cell

[0332] Optionally, the method comprises using the received signal and / or the determined maximum output power parameter to perform one or more of the following tasks:

[0333] performing a radio measurement in the network node

[0334] adapting a first TTI of the wireless device in the first cell in DL and / or UL;

[0335] adapting a first TTI of the wireless device in the first cell in different time resources;

[0336] performing a power control operation of the wireless device in the first cell; and

[0337] transmitting information about the determined maximum output power parameter and transmission window to at least one node;

[0338] Optionally, the method comprises determining the value of P1 based on a relationship or mapping between the TTI and the maximum output power parameter.

[0339] Optionally, the method comprises using a reference time or window (Tw, TTI REF ) for determining the maximum output power parameter. The window can be based on or a function of one or more of the TTI lengths. Optionally, the window has a length determined or obtained as one or more of: a least common multiple of the TTI lengths, a highest value of the TTI lengths, a fraction of one of the TTI lengths, half of one of the TTI lengths, a fraction (e.g. half) of the highest value of the TTI lengths, or a predetermined value (e.g. 7 OFDM symbols), optionally as a function of the TTI lengths.

[0340] Optionally, the method comprises using a parameter for configuring the maximum output power based on a plurality of evaluations of the parameter for different TTI instances. For example, the parameter is based on a comparison of the parameter for a plurality of different TTI lengths and / or a comparison of the parameter for a plurality of different TTIs. Optionally, the parameters compared are evaluated over a period, which can be the same or different from the reference time. Optionally, the parameters evaluated are for TTIs on one or more carriers / cells. The reference time can be different for the TTIs evaluated. Optionally, the reference time is one time slot. Optionally, the parameters can be independently evaluated at each reference time. Optionally, the smallest one of the evaluated parameters is selected.

[0341] According to certain embodiments, a network node is provided for obtaining configured output power for different TTI modes for carrier aggregation. The network node comprises a memory storing instructions, and a processor configured to execute the instructions to cause the processor to:

[0342] configure a wireless device with (1) a first TTI for operating a first signal between a first cell on a first carrier and the wireless device, and (2) a second TTI for operating a second signal between a second cell on a second carrier and the wireless device;

[0343] determine a maximum output power parameter based on a configured value of the first TTI and a configured value of the second TTI;

[0344] receive (1) the first signal in the first cell from the wireless device based on the determined maximum output power parameter and / or (2) the second signal in the second cell based on the determined maximum output power parameter;

[0345] Optionally, the method further comprises configuring the wireless device with a plurality of TTIs for a corresponding plurality of serving cells;

[0346] Optionally, the method further comprises transmitting a message to the wireless device, the message comprising an RRC message;

[0347] Optionally, the method further comprises transmitting a first message and a second message to the wireless device, the first message comprising a first TTI, the second message comprising a second TTI;

[0348] Optionally, the method further comprises determining the first value for the first TTI and the second value for the second TTI based on one or more of:

[0349] whether the wireless device supports two or more different TTIs on each serving cell;

[0350] a required UE bit rate on each serving cell

[0351] a round trip time required for delivering data packets between the wireless device and the network node;

[0352] a location of the wireless device relative to the serving cell

[0353] Optionally, the method comprises using the received signal and / or the determined maximum output power parameter to perform one or more of the following tasks:

[0354] performing a radio measurement in the network node

[0355] adapting a first TTI of the wireless device in the first cell in DL and / or UL;

[0356] adapting the first TTI of the wireless device in the first cell in different time resources;

[0357] performing a power control operation of the wireless device in the first cell; and

[0358] transmitting information about the determined maximum output power parameter and the transmission window to at least one node;

[0359] Optionally, the method comprises determining the value of P1 based on a relationship or mapping between the TTI and the maximum output power parameter.

[0360] Optionally, the method comprises using a reference time or window (Tw, TTI REF ) for determining the maximum output power parameter. The window can be based on or a function of one or more of the TTI lengths. Optionally, the window has a length determined or obtained as one or more of: a least common multiple of the TTI lengths, a highest value of the TTI lengths, a fraction of one of the TTI lengths, half of one of the TTI lengths, a fraction (e.g. half) of the highest value of the TTI lengths, or a predetermined value (e.g. 7 OFDM symbols), optionally dependent on the TTI lengths.

[0361] Optionally, the method comprises using a parameter for configuring the maximum output power based on a plurality of evaluations of the parameter for different TTI instances. For example, the parameter is based on a comparison of the parameter for a plurality of different TTI lengths and / or a comparison of the parameter for a plurality of different TTIs. Optionally, the parameters compared are evaluated over a period, which can be the same as or different from the reference time. Optionally, the parameters evaluated are for TTIs on one or more carriers / cells. The reference time can be different for the TTIs evaluated. Optionally, the reference time is one time slot. Optionally, the parameters can be independently evaluated at each reference time. Optionally, the smallest of the evaluated parameters is selected.

[0362] Certain embodiments of the disclosure can provide one or more technical advantages. For example, certain embodiments can provide well-defined wireless device behavior with respect to configured transmit power. As another example, a technical advantage can be that wireless device behavior with respect to configured transmit power is well-defined when using different TTI modes in the same cell in different time resources. As yet another example, a technical advantage can be that a network node can receive and process signals when a wireless device transmits signals using different maximum power depending on TTI.

[0363] Modifications, additions, or omissions can be made to the systems and apparatuses described herein without departing from the scope of the disclosure. The components of the systems and apparatuses can be integrated or separated. Moreover, the operations of the systems and apparatuses can be performed by more, fewer, or other components. Additionally, operations of the systems and apparatuses can be performed using any suitable logic comprising software, hardware, and / or other logic. As used in this document, "each" refers to each member of a set or each member of a subset of a set.

[0364] Modifications, additions, or omissions can be made to the methods described herein without departing from the scope of the disclosure. The methods can include more, fewer, or other steps. Additionally, steps can be performed in any suitable order.

[0365] While this disclosure has described certain embodiments and generally associated methods, alterations and permutations of these embodiments and methods will be apparent to those skilled in the art. Accordingly, the above-described embodiments are not intended to be limiting, but merely illustrative. Further, other changes, substitutions, and alterations are possible without departing from the spirit and scope of this disclosure.

Claims

1. A method for determining a maximum output power by a wireless device (110), the method comprising: The wireless device (110) obtains (402) a first time resource, which is used to transmit a first signal in a first cell on a first carrier. The wireless device (110) obtains (404) a second time resource, which is used to transmit a second signal in a second cell on a second carrier; The first and second carriers mentioned above are component carriers transmitted by carrier aggregation; A reference time is determined based on at least one of the first time resource and the second time resource, wherein the reference time is determined to be the highest value of the length of the first time resource and the length of the second time resource. Determine (406) the maximum output power to be applied over the entire reference time; Based on the determined maximum output power, the first signal is transmitted (408) in the first cell and the second signal is transmitted (408) in the second cell.

2. The method of claim 1, wherein the maximum output power parameter is a lower limit of the maximum output power.

3. The method as described in any of the preceding claims, wherein the maximum output power is evaluated in each evaluation period.

4. A wireless device (110) for determining a maximum output power, the wireless device comprising: Memory (230) for storing instructions; as well as Processor (220), the processor being configured to execute the instructions to cause the wireless device to: Obtain first time resources, which are used to transmit a first signal in a first cell on a first carrier. Obtain a second time resource, which is used to transmit a second signal in a second cell on a second carrier; The first and second carriers mentioned above are component carriers transmitted by carrier aggregation; A reference time is determined based on at least one of the first time resource and the second time resource, wherein the reference time is determined to be the highest value of the length of the first time resource and the length of the second time resource. Determine the maximum output power to be applied over the entire reference time; as well as Based on the determined maximum output power, the first signal is transmitted to the first cell and the second signal is transmitted to the second cell.

5. The wireless device of claim 4, wherein the maximum output power is a lower limit of the maximum output power.

6. The wireless device of any one of claims 4 or 5, wherein the wireless device is configured to evaluate the maximum output power in each evaluation period.

7. A method for determining maximum output power by a network node (115), the method comprising: The wireless device (702) (110) is configured using the first time resources used to transmit the first signal in the first cell on the first carrier; The wireless device (704) is configured using a second time resource for transmitting a second signal in a second cell on a second carrier; The first and second carriers mentioned above are component carriers transmitted by carrier aggregation; A reference time is determined based on at least one of the first time resource and the second time resource, wherein the reference time is determined to be the highest value of the length of the first time resource and the length of the second time resource. Determine (706) the maximum output power to be applied over the entire reference time; Based on the maximum output power, the first signal on the first cell and the second signal on the second cell are received (708) from the wireless device.

8. The method of claim 7, wherein the maximum output power is a lower limit of the maximum output power.

9. The method of any one of claims 7 or 8, wherein the maximum output power is evaluated in each evaluation period.

10. A network node (115) for determining maximum output power, the network node comprising: Memory (530) for storing instructions; as well as Processor (520), the processor being configured to execute the instructions to cause the network node to: The wireless device (110) is configured using first time resources for transmitting a first signal in a first cell on a first carrier; The wireless device is configured using a second time resource for transmitting a second signal in a second cell on a second carrier. The first and second carriers mentioned above are component carriers transmitted by carrier aggregation; The processor is configured to execute the instructions to: A reference time is determined based on at least one of the first time resource and the second time resource, wherein the reference time is determined to be the highest value of the length of the first time resource and the length of the second time resource. Determine the maximum output power to be applied over the entire reference time; Based on the maximum output power, the first signal on the first cell and the second signal on the second cell are received from the wireless device.

11. The network node of claim 10, wherein the maximum output power is a lower limit of the maximum output power; and / or wherein the network node is configured to evaluate the maximum output power in each evaluation period.

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