Source: https://patents.google.com/patent/KR101986865B1/en
Timestamp: 2020-01-28 07:02:52
Document Index: 159288301

Matched Legal Cases: ['Application No. 61', 'Application No. 61', 'Application No. 61', 'Application No. 61', 'Application No. 61', 'Application No. 61']

KR101986865B1 - Method and apparatus for power control for wireless transmissions on multiple component carriers associated with multiple timing advances - Google Patents
Method and apparatus for power control for wireless transmissions on multiple component carriers associated with multiple timing advances Download PDF
KR101986865B1
KR101986865B1 KR1020147015140A KR20147015140A KR101986865B1 KR 101986865 B1 KR101986865 B1 KR 101986865B1 KR 1020147015140 A KR1020147015140 A KR 1020147015140A KR 20147015140 A KR20147015140 A KR 20147015140A KR 101986865 B1 KR101986865 B1 KR 101986865B1
KR1020147015140A
KR20140091733A (en
존 더블유 하임
버코위츠 자넷 에이 스턴
스티븐 이 테리
버질 콤사
2011-11-04 Priority to US201161555853P priority Critical
2011-11-04 Priority to US61/555,853 priority
2012-01-26 Priority to US201261591050P priority
2012-01-26 Priority to US61/591,050 priority
2012-03-16 Priority to US201261612096P priority
2012-03-16 Priority to US61/612,096 priority
2012-05-09 Priority to US201261644726P priority
2012-05-09 Priority to US61/644,726 priority
2012-07-31 Priority to US201261677750P priority
2012-07-31 Priority to US61/677,750 priority
2012-09-25 Priority to US201261705436P priority
2012-09-25 Priority to US61/705,436 priority
2012-11-02 Application filed by 인터디지탈 패튼 홀딩스, 인크 filed Critical 인터디지탈 패튼 홀딩스, 인크
2012-11-02 Priority to PCT/US2012/063422 priority patent/WO2013067430A1/en
2014-07-22 Publication of KR20140091733A publication Critical patent/KR20140091733A/en
2019-06-07 Publication of KR101986865B1 publication Critical patent/KR101986865B1/en
239000000969 carrier Substances 0 abstract claims description title 52
230000001052 transient Effects 0 description 13
A power control method and apparatus for wireless transmission over a plurality of component carriers associated with a plurality of timing advances is disclosed. If the sum of the transmit powers of the channels is likely to exceed the configured maximum output power for a subframe in which each TAG may be associated with a separate timing advance value for the uplink transmission, the wireless transmit / receive unit The WTRU may perform power scaling or other adjustments on the physical channels of each subframe to be transmitted on a component carrier belonging to a different timing advance group (TAG). A WTRU may adjust the transmit power of at least one physical channel if the sum of transmit power in the overlap region of the subframe of the less advanced TAG and the more advanced TAG is likely to exceed the configured maximum WTRU output power during the overlap.
TECHNICAL FIELD The present invention relates generally to a method and apparatus for power control for wireless transmission on multiple component carriers associated with multiple timing advances, and more particularly, to a method and apparatus for power control for wireless transmission on multiple component carriers associated with multiple timing advances. &Lt; Desc / Clms Page number 1 &gt;
This application claims the benefit of U.S. Provisional Application No. 61 / 555,853, filed on November 4, 2011, U.S. Provisional Application No. 61 / 591,050, filed January 26, 2012, U.S. Provisional Application No. 61 U.S. Provisional Application No. 61 / 644,726, filed May 9, 2012, U.S. Provisional Application No. 61 / 677,750, filed July 31, 2012, and U.S. Provisional Application No. 61 / 677,750 filed on September 25, 2012, / 705,436, the contents of which are hereby incorporated by reference.
BACKGROUND OF THE INVENTION Wireless communication systems are widely prevalent to provide various types of communication content such as voice, data, and the like. These systems may be multiple access systems capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth and transmit power). Examples of such multiple access systems include a code division multiple access (CDMA) system, a time division multiple access (TDMA) system, a frequency division multiple access (FDMA) system, a third generation partnership project (3GPP) long term evolution And an orthogonal frequency division multiple access (OFDMA) system.
These multiple access technologies are employed in various telecommunications standards to provide a common protocol that allows different wireless devices to communicate at the local, national, regional, and global levels. An example of a rising telecommunications standard is LTE. LTE is a Universal Mobile Telecommunications System (UMTS) mobile standard set published by 3GPP. (OFDMA) on a downlink (DL), a single carrier frequency division multiple access (UL) on an uplink (UL), and the like, to improve spectral efficiency, reduce cost, improve service, SC-FDMA), and multiple-input multiple-output (MIMO) antenna technologies to better support mobile broadband Internet access.
Uplink transmitter transmission control in a mobile communication system is advantageous in that it minimizes the interference of other users of the system and is sufficient to achieve the desired quality of service (e.g., data rate and error rate) and the need to maximize the battery life of the mobile terminal. Balancing the need for transmit energy. To achieve this goal, the uplink power control has the characteristics of a radio propagation channel, including path loss, shadowing, fast fading, and interference from other users in the same cell and neighboring cells. You have to adapt to them.
A power control method and apparatus for wireless transmission for multiple component carriers associated with multiple timing advances is disclosed. If the sum of the transmit powers of the channels is likely to exceed the configured maximum output power for the subframe in which each timing advance group (TAG) may be associated with a separate timing advance value for the uplink transmission, A wireless transmit / receive unit (WTRU) may perform power scaling or other adjustments on the physical channels of each subframe to be transmitted on a component carrier belonging to different TAGs. The WTRU may adjust the transmit power of at least one physical channel if the sum of the transmit power at the overlapping sub-frames of the less advanced TAG and the more advanced TAG is likely to exceed the configured maximum WTRU output power during the overlap .
The WTRU may drop a sounding reference signal (SRS) if another physical channel is scheduled to be transmitted in the overlapping symbol for any component carrier. If the configured maximum WTRU output power is not equal to the sum of the configured maximum WTRU output power for any serving cell or the WTRU output power for serving cells, then the WTRU sends a power headroom Reports can be sent.
The WTRU may transmit a physical random access channel (PRACH) at a constant power level determined for the first subframe of the PRACH. A guard symbol may be included in the component carrier to avoid overlapping channels.
Can be understood in more detail from the following description given as an example together with the accompanying drawings.
Figure la is a system diagram of an exemplary communication system in which one or more of the disclosed embodiments may be implemented.
1B is a system diagram of an exemplary wireless transmit / receive unit (WTRU) that may be used in the communication system illustrated in FIG. 1A.
1C is a system diagram of an exemplary radio access network and an exemplary core network that may be used within the communication system illustrated in FIG. 1A.
Figure 2 shows an exemplary sub-frame that is a cell specific SRS sub-frame in one component carrier (CC), but not a cell specific SRS sub-frame in another CC.
Figure 3 shows an example of a number of timing advance groups (TAGs) to which different timing advances (TA) are applied to each TAG.
Figures 4A and 4B illustrate examples of cross-subframe collisions between SRS and other channel transmissions.
Figures 5A-5C illustrate examples of transmission of SRS and other channels in the case of a TA difference of less than one symbol between CCs.
6A-6C illustrate examples of transmission of SRS and other channels in the case of a TA difference of two or more symbols.
FIG. 7 shows an example of cross-subframe collisions for the SRS preceding the subframe.
8 shows an example of SRS included in the middle of a subframe.
Figure 9 shows an example of the use of measurements to determine the TA difference between two cells.
FIG. 10 shows an example of potential interference between a past subframe and a current subframe.
11 shows an example of superposition of the physical random access channel (PRACH) of the past subframe for the current subframe.
12 shows an example of a guard symbol included in the current subframe in the more advanced CC.
Figures 13 and 14 illustrate examples of transient periods without SRS and transient periods with SRS, respectively.
Figures 15 and 16 illustrate examples of extended transient periods for non-SRS transmission and SRS transmission.
FIG. 17 shows an example where scaling per symbol is applied to overlapping symbols.
18A shows an example in which the transmit power in the superposition is rescaled after power is determined for two adjacent subframes.
18B shows an example in which the transmit power in the overlap is scaled separately from the transmit power in the non-overlapping regions.
Figure 19 illustrates an exemplary overlapping area based on uplink (UL) timing.
Figure 20 shows an exemplary overlap region including a transitional region.
Figure la is a drawing of an example communication system 100 in which one or more of the disclosed embodiments may be implemented. The communication system 100 may be a multiple access system that provides content to a plurality of wireless users such as voice, data, video, messaging, broadcast, and the like. The communication system 100 allows multiple wireless users to access such content through the sharing of system resources including wireless bandwidth. For example, the communication systems 100 may include one or more of code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal FDMA, One or more channel access methods may be employed.
1A, a communication system 100 includes a wireless transmit / receive unit (WTRU) 102a, 102b, 102c and 102d, a radio access network (RAN) 104, a core network 106, a public switched telephone network 108, the Internet 110, and other networks 112, but it is to be understood that the disclosed embodiments may take into account any number of WTRUs, base stations, networks, and / or network elements will be. Each of the WTRUs 102a, 102b, 102c, and 102d may be any type of device configured to operate and / or communicate in a wireless environment. As an example, the WTRUs 102a, 102b, 102c, and 102d may be configured to transmit and receive wireless signals and may include a user equipment (UE), a mobile station, a fixed or mobile subscriber unit, a pager, a cell phone, a personal digital assistant Smart phones, laptops, netbooks, personal computers, wireless sensors, consumer electronics, and the like.
Communication systems 100 may also include base stations 114a and 114b. Each of the base stations 114a and 114b may wirelessly interface with at least one of the WTRUs 102a, 102b, 102c and 102d to communicate with one or more communication networks, such as the core network 106, the Internet 110, and / Lt; RTI ID = 0.0 &gt; a &lt; / RTI &gt; As an example, base stations 114a and 114b may be a base transceiver station (BTS), a Node-B, an eNode B, a Home eNode B, a site controller, an access point (AP) It will be appreciated that although base stations 114a and 114b are each described as a single entity, base stations 114a and 114b may include any number of interconnected base stations and / or network elements.
Base station 114a may be part of RAN 104, which may include other base stations and / or network elements (not shown) such as a base station controller (BSC), a radio network controller (RNC), relay nodes, Base stations 114a and / or 114b may be configured to transmit and receive wireless signals within a particular geographic area, which may be referred to as a cell (not shown). The cell may be further divided into cell sectors. For example, the cell associated with base station 114a may be divided into three sectors. Thus, in one embodiment, base station 114a may include three transceivers, one per sector of the cell. In another embodiment, base station 114a may utilize multiple transceivers per sector of the cell using multiple-input multiple output (MIMO) techniques.
The base stations 114a and 114b may include a wireless interface 116 that may be any suitable wireless communication link (e.g., radio frequency (RF), microwave, infrared (IR), ultraviolet And may communicate with one or more of the WTRUs 102a, 102b, 102c, and 102d. The wireless interface 116 may be constructed using any suitable wireless access technology (RAT).
More specifically, as described above, communication system 100 may be a multiple access system and may employ one or more channel access schemes such as CDMA, TDMA, FDMA, OFDMA, SC-FDMA, For example, the base station 114a and the WTRUs 102a, 102b, and 102c of the RAN 104 may use a universal mobile telecommunications system (UMTS) capable of building the air interface 116 using WCDMA (wideband CDMA) A radio technology such as Terrestrial Radio Access (UTRA) can be implemented. WCDMA may include communications protocols such as High-Speed Packet Access (HSPA) and / or Evolved HSPA (HSPA +). The HSPA may include High-Speed Downlink Packet Access (HSDPA) and / or High-Speed Uplink Packet Access (HSUPA).
In another embodiment, base station 114a and WTRUs 102a, 102b, and 102c may establish wireless interface 116 using Long Term Evolution (LTE) and / or LTE-Advanced (LTE-A) Such as Evolved UMTS Terrestrial Radio Access (E-UTRA).
In other embodiments, base station 114a and WTRUs 102a, 102b, and 102c may be configured to support IEEE 802.16 (i.e., Worldwide Interoperability for Microwave Access), CDMA2000, CDMA2000 IX, CDMA2000 EV- Such as Interim Standard 2000, IS-95 Interim Standard 95, IS-856 Interim Standard 856, Global System for Mobile communications (GSM), Enhanced Data Rates for GSM Evolution (EDGE) Wireless technologies can be implemented.
1A may be, for example, a wireless router, a Home Node B, a Home eNode B, or an access point and may facilitate wireless connectivity in localized areas such as a business premises, a home, a vehicle, a university, Lt; RTI ID = 0.0 &gt; RAT. &Lt; / RTI &gt; In one embodiment, base station 114b and WTRUs 102c and 102d may implement a wireless technology such as IEEE 802.11 to establish a wireless local area network (WLAN). In another embodiment, base station 114b and WTRUs 102c and 102d may implement a wireless technology such as IEEE 802.15 to establish a wireless personal area network (WPAN). In another embodiment, base station 114b and WTRUs 102c and 102d utilize a cellular based RAT (e.g., WCDMA, CDMA2000, GSM, LTE, LTE-A, (femtocell) can be constructed. As shown in FIG. 1A, the base station 114b may have a direct connection with the Internet 110. Accordingly, the base station 114b may not be required to access the Internet 110 via the core network 106. [
RAN 104 may be any type of network configured to provide voice, data, applications, and / or voice over internet protocol (VoIP) services to one or more of WTRUs 102a, 102b, 102c, May be communicating with the core network 106. For example, the core network 106 may provide call control, billing services, mobile location based services, prepaid calls, Internet connectivity, video distribution, and / or perform advanced security functions such as user authentication . Although not shown in FIG. 1A, the RAN 104 and / or the core network 106 may be in direct or indirect communication with other RANs that adopt the same RAT as the RAN 104 or different RATs. For example, the core network 106 may be in communication with another RAN (not shown) employing GSM wireless technology as well as being connected to the RAN 104 that may utilize E-UTRA wireless technology.
The core network 106 may also serve as a gateway for the WTRUs 102a, 102b, 102c and 102d to access the PSTN 108, the Internet 110, and / or the other network 112. [ The PSTN 108 may include a circuit-switched telephone network that provides plain old telephone service (POTS). The Internet 110 is an interconnected computer network using common communication protocols such as Transmission Control Protocol (TCP), User Datagram Protocol (UDP), and Internet Protocol (IP) in a TCP / IP Internet protocol suite. And a global system of devices. Networks 12 may include a wired or wireless communication network owned and / or operated by another service provider. For example, the network 112 may include another RAN 104 or a different core network coupled to one or more RANs capable of employing different RATs.
Some or all of the WTRUs 102a, 102b, 102c, and 102d in the communication system 100 may include multi-mode capability, i.e., the WTRUs 102a, 102b, 102c, And may include a plurality of transceivers for communicating with different wireless networks via links. For example, the WTRU 102c shown in FIG. 1A may be configured to communicate with a base station 114a capable of employing cellular based wireless technology and a base station 114b capable of employing IEEE 802 wireless technology.
FIG. 1B is a system diagram of an exemplary WTRU 102. 1B, the WTRU 102 includes a processor 118, a transceiver 120, a transceiver element 122, a speaker / microphone 132, a keypad 126, a display / touch pad 128, A removable memory 132, a power source 134, a global positioning system (GPS) chipset 136, and other peripherals 138. The removable memory 132, It will be appreciated that the WTRU 102 may include any sub-combination of the above-described elements as long as it is consistent with an embodiment.
The processor 118 may be implemented as a general purpose processor, a dedicated processor, a conventional processor, a digital signal processor (DSP), a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, a controller, a microcontroller, an Application Specific Integrated Circuit (ASIC) (Field Programmable Gate Array) circuits, any other type of integrated circuit (IC), state machine, and the like. The processor 118 may perform signal coding, data processing, power control, input / output processing, and / or any other functionality that allows the WTRU 102 to operate in a wireless environment. The processor 118 may be coupled to a transceiver 120 that may be coupled to the transceiving element 122. It is to be appreciated that while FIG. 1B illustrates processor 118 and transceiver 120 as separate components, processor 118 and transceiver 120 may be integrated together in an electronic package or chip.
The transceiving element 122 may be configured to transmit or receive signals to and from a base station (e.g., base station 114a) via the air interface 116. [ For example, in one embodiment, the transceiving element 122 may be an antenna configured to transmit and receive RF signals. In another embodiment, the transceiving element 122 may be, for example, an emitter / detector configured to transmit and receive IR, UV, or visible light signals. In another embodiment, the transceiving element 122 may be configured to transmit and receive both the RF signal and the optical signal. It will be appreciated that the transceiving element 122 may be configured to transmit and receive any combination of wireless signals.
1B, the WTRU 102 may include any number of transceiving elements 122. Although the transceiving elements 122 are illustrated in FIG. More specifically, the WTRU 102 may employ MIMO technology. Thus, in one embodiment, the WTRU 102 may include two or more transmit / receive elements 122 (e.g., multiple antennas) for transmitting and receiving wireless signals via the air interface 116. [
The transceiver 120 may be configured to modulate the signal to be transmitted by the transceiving element 122 and to demodulate the signals received by the transceiving element 122. As described above, the WTRU 102 may have multi-mode capability. Accordingly, the transceiver 120 may include a plurality of transceivers through which the WTRU 102 may communicate via a number of RATs, such as, for example, UTRA and IEEE 802.11.
The processor 118 of the WTRU 102 may include a speaker / microphone 124, a keypad 126, and / or a display / touchpad 128 (e.g., a liquid crystal display (LCD) ) Display unit) to receive user input data therefrom. Processor 118 may also output user data to speaker / microphone 124, keypad 126, and / or display / touchpad 128. In addition, the processor 118 may access and store data from any type of suitable memory, such as the non-removable memory 106 and / or the removable memory 132. [ The non-removable memory 106 may include random access memory (RAM), read-only memory (ROM), hard disk, or other type of memory storage device. Removable memory 132 may include a subscriber identity module (SIM) card, a memory stick, a secure digital (SD) memory card, and the like. In other embodiments, the processor 118 may access and store data from memory that is not physically located in the WTRU 102, such as a server or a home computer (not shown).
The processor 118 may receive power from the power source 134 and may be configured to distribute and / or control power to other components of the WTRU 102. The power supply 134 may be any suitable device that provides power to the WTRU 102. For example, the power source 1340 may include one or more dry cell batteries (e.g., nickel-cadmium (NiCd), nickel-zinc (NiZn), nickel hydride (NiMH), lithium- Batteries, fuel cells, and the like.
The processor 118 may also be coupled to a GPS chipset 136 that may be configured to provide location information (e.g., latitude and longitude) with respect to the current location of the WTRU 102. In addition to or in addition to information from the GPS chipset 136, the WTRU 102 may receive location information from the base station (e.g., base stations 114a and 114b via the air interface 116) and / Based on the timing of signals received from more than one nearby base stations. It is understood that the WTRU 102 may obtain location information via any suitable location determination method as long as it is consistent with an embodiment. Will be.
The processor 118 may further be coupled to other peripherals 138, which may include one or more software and / or hardware modules that provide additional features, functionality, and / or wired and wireless connectivity. For example, the peripheries 138 may include an accelerometer, an electronic compass, a satellite transceiver, a digital camera (for photo or video), a universal serial bus (USB) port, a vibration device, a television transceiver, A frequency modulated (FM) wireless unit, a digital music player, a media player, a video game player module, an Internet browser, and the like.
1C is a system diagram of RAN 104 and core network 106 in accordance with one embodiment. As described above, the RAN 104 may employ E-UTRA radio technology to communicate with the WTRUs 102a, 102b, and 102c via the air interface 116. [ The RAN 104 may also communicate with the core network 106.
It will be appreciated that RAN 104 may include eNode-Bs 140a, 140b, and 140c, but may include any number of eNode-Bs as long as it is consistent with one embodiment. The eNode-Bs 140a, 140b, and 140c may also include one or more transceivers for communicating with the WTRUs 102a, 102b, and 102c via the air interface 116. In one embodiment, eNode-Bs 140a, 140b, and 140c may implement MIMO technology. Accordingly, eNode-B 140a can transmit and receive wireless signals to and from the WTRU 102a using, for example, multiple antennas.
Each of the eNode-Bs 140a, 140b, and 140c may be associated with a particular cell (not shown) and may include a radio resource management decision, a handover decision, and scheduling of users on the uplink and / As shown in FIG. As shown in FIG. 1C, the eNode-Bs 140a, 140b, and 140c may communicate with each other via the X2 interface.
The core network 106 shown in FIG. 1C may include a mobility management gateway 142, a serving gateway 144, and a packet data network (PDN) gateway 146. Although each of the foregoing elements is described as part of the core network 106, it will be understood that any of these elements may be owned and / or operated by an entity other than the core network operator.
The MME 142 may be connected to each of the eNode-Bs 142a, 142b, and 142c of the RAN 104 via the S1 interface, and may serve as a control node. For example, the MME 142 may be configured to authenticate the bearers of the users of the WTRUs 102a, 102b, and 102c, to enable bearer activation / deactivation of the bearers of the WTRUs 102a, 102b, You can take charge of your choice. The MME 142 may also provide control plane functionality for switching between the RAN 104 and other RANs (not shown) that employ other wireless technologies such as GSM or WCDMA.
The serving gateway 144 may be connected to each of the eNode-Bs 140a, 140b, and 140c in the RAN 104 via the S1 interface. Serving gateway 144 is generally capable of routing and forwarding user data packets to / from WTRUs 102a, 102b, and 102c. Serving gateway 144 also locks the user plane during handover between eNode Bs and triggers paging when downlink data is available to WTRUs 102a, 102b, and 102c, and WTRUs 102a, 102b , &Lt; / RTI &gt; and 102c). &Lt; / RTI &gt;
The serving gateway 144 may also provide access to the packet switched network, such as the Internet 110, to the WTRUs 102a, 102b, and 102c to provide access between the WTRUs 102a, 102b, and 102c and the IP- Lt; RTI ID = 0.0 &gt; 146 &lt; / RTI &gt;
The core network 106 may facilitate communication with other networks. For example, core network 106 may also provide access to WTRUs 102a, 102b, and 102c to circuit-switched networks such as PSTN 108 to provide access to WTRUs 102a, 102b, And may facilitate communication between land-line communication devices. For example, the core network 106 may include or communicate with an IP gateway (e.g., an IP Multimedia Subsystem (IMS) server) that serves as an interface between the core network 106 and the PSTN 108 . Core network 106 may also provide access to WTRUs 102a, 102b, and 102c to networks 112, which may include other wired and wireless networks owned and / or operated by other service providers. have.
For example, in 3GPP LTE according to LTE Release 8 (R8), a WTRU may transmit on one carrier to one cell, which may be referred to as a serving cell. For example, a WTRU supporting carrier aggregation according to LTE Release 10 (R10) can transmit on multiple carriers simultaneously and can have multiple serving cells.
In some embodiments, the cell includes a combination of downlink and / or uplink resources. Each of the downlink and uplink resource sets may be associated with a carrier frequency and bandwidth that may be the center frequency of the cell.
For example, a WTRU supporting carrier aggregation according to LTE R10 may be composed of one or more serving cells (or component carriers (CCs)), and a WTRU may be configured for UL communication for each CC. It should be considered that the CC and serving cell can be used interchangeably and still be compatible with the embodiments included herein.
A WTRU supporting carrier aggregation can communicate with one primary cell (PCell) and one or more secondary cells (Scell). The terms cell and serving cell may be used interchangeably.
In LTE, the WTRU UL transmission over the CC in any given subframe may include at least one of a physical random access channel (PRACH), a physical uplink shared channel (PUSCH), and a physical uplink control channel (PUCCH). UL transmission can be managed for each subframe. For example, transmission of the PUSCH and / or PUCCH at each of some transmission power in any given subframe may be managed separately from transmission of the PUSCH and / or PUCCH in any other subframe. In the CC, the PUSCH and PUCCH transmissions may use some subcarrier sets, as indicated, for example, by respective grants or other configurations or allocations, and certain symbols, e.g., WTRUs, As far as possible, symbols that can be used or reserved for symbols that can transmit a demodulation reference signal (DMRS) or a sounding reference signal (SRS), and all symbols of a subframe Can be used. For example, for a normal cyclic prefix (CP), the PUSCH may be transmitted in twelve of the 14 symbols of the subframe with the DMRS of symbols 3 and 10, and symbols 2 through 4 and symbols 9 through 9, May be transmitted in eight of the 14 symbols along with the 11 DMRS.
In certain subframes, the WTRU may transmit the SRS. The WTRU may send an SRS based on scheduling and transmission parameters that may be provided to the WTRU by the evolved NodeB (eNB) via one or more of, for example, broadcast signaling and radio resource control (RRC) It can be periodically transmitted. The cell specific SRS configuration may define subframes in which the SRS is allowed to be transmitted by WTRUs for a given cell. A WTRU specific SRS configuration may define subframes and transmission parameters that may be used by a particular WTRU. In a WTRU specific subframe, the WTRU may transmit the last symbol &lt; RTI ID = 0.0 &gt; (e. G., &Lt; / RTI &gt; through the entire frequency band of interest using a single SRS transmission, or through a portion of the band using hopping in the frequency domain in such a way that the SRS transmission sequence covers the frequency band of interest together SRS &lt; / RTI &gt; A particular WTRU may transmit SRS in WTRU specific subframes that are a subset of the cell specific SRS subframes. The WTRU may also send an SRS upon request in response to an aperiodic SRS request from a network that may be included in a downlink control information (DCI) format, which may also provide an UL grant. Separate WTRU specific SRS configurations may be provided to the WTRU for periodic and aperiodic SRS transmissions.
Certain rules may be applied to the cell specific SRS subframes. In a cell-specific SRS sub-frame of a specific CC in which the PUSCH is scheduled for transmission over a CC by a certain WTRU, a certain WTRU may shorten the PUSCH transmission if the PUSCH transmission overlaps some or all of the cell specific SRS bandwidth For example, it may not map or transmit the PUSCH to the last symbol of the subframe). Without overlap, a given WTRU may not shorten the PUSCH transmission. In each case, a certain WTRU can transmit a PUSCH in a subframe, and if this subframe is a WTRU specific SRS subframe for a certain WTRU, then a certain WTRU can transmit the PUSCH and SRS in the individual symbols of the subframe It is possible to transmit the SRS of the subframe.
A constant PUCCH format, e.g. PUCCH format 1, 1a, 1b, or 3, is scheduled for transmission by a certain WTRU on the CC and a parameter, e.g. ackNackSRS-SimultaneousTransmission, is set to a constant value such as TRUE for at least certain WTRUs. In certain SRS subframes, a given WTRU may use a shortened PUCCH format that does not use the last symbol of a subframe (e.g., a certain WTRU may not map the PUCCH to the last symbol of the subframe or transmit the PUCCH has exist). If a given WTRU can transmit a PUCCH in a subframe, and this subframe is a WTRU specific SRS subframe for a given WTRU, then a certain WTRU can determine that the PUSCH and SRS are transmitted in the sub- Can be transmitted. If another PUCCH format is scheduled for transmission or if a parameter, e.g. ackNackSRS-SimultaneousTransmission, is some other value such as FALSE for at least a certain WTRU, then a certain WTRU may use the regular (e.g., non-shortened) And may drop the SRS (e.g., it may not transmit).
The WTRU can synchronize the transmission / reception timing with the reception frame timing of the reference cell. With a carrier aggregation (CA), the reference cell may be a primary cell (PCell) or a secondary cell (SCell). The timing of received frame boundaries may vary over time due to WTRU motion and / or other factors (e.g., oscillator drift), and thus the WTRU may adjust its own timing accordingly. In addition, the WTRU may apply a timing advance (TA) to the transmission signals (e.g., the WTRU may initiate transmission of a predetermined UL subframe at a predetermined time) before the beginning of the corresponding DL subframe For applied TA). The eNB may provide TA commands to each WTRU that can communicate in the UL or under its control, and the eNB may be configured such that the UL transmissions from the WTRUs in nominally designated subframes for a given cell are transmitted in nominally constant cells It is possible to provide these commands with the intention to arrive. The WTRU can self adjust its uplink timing according to the received downlink frame of the reference cell, and its timing can vary.
The term &quot; timing advance group &quot; (TAG), for example, uses the downlink timing reference of each cell, where the reference may or may not be the same for all cells in the group, A group of one or more serving cells that can be configured by higher layer signaling, such as RRC signaling, applicable for each cell within the cell. The application of TA may be limited to cells having a configured uplink. The TAG may be limited to cells having a configured uplink. The primary TAG (pTAG) can be a TAG containing PCell. pTAG may or may not include SCell. The secondary TAG (sTAG) can be a TAG that does not contain PCell. The sTAG may include only SCells and may include at least one cell with a configured uplink.
A WTRU configured for a CA may transmit to more than one serving cell in the same subframe. The terms &quot; serving cell &quot; and &quot; CC &quot; may be used interchangeably. In certain cases, such as in-band CAs (e.g., where the aggregated CCs are in the same band), the WTRU may use the same DL timing reference and the same timing advance for the aggregated CCs, Subframes can be sent to aggregated CCs that are aligned (e.g., precisely or nearly exactly time aligned).
TA and &lt; RTI ID = 0.0 &gt; ATA &lt; / RTI &gt; may be replaced with UL timing and UL timing differences, respectively, in any of the embodiments described below. The terms &quot; subframe &quot; and &quot; transmission time interval &quot; (TTI) may be used interchangeably. The subframes i and i + 1 may represent consecutive subframes that may be timely overlapped and N and N + 1 may be used instead of i and i + 1. The terms &quot; power backoff &quot; and &quot; power reduction &quot; may be used interchangeably. Italic representation and non-italic representation may be used interchangeably.
For each subframe the WTRU can transmit, the WTRU may set the transmit power of the physical channels to be transmitted. The WTRU may determine the PUSCH, PUCCH, and / or SRS transmit power in accordance with at least one of the following equations.
May be the power of PUSCH and SRS for CC (c) in subframe i, respectively,
May be the power of the PUCCH in subframe i,
May be the configured maximum output power for CC (c) in subframe (i), each of which may be in units of dBm.
Lt; / RTI &gt; The WTRU may be within an allowed limit
May be expressed as the number of resource blocks available for the subframe (i) and the serving cell (c) as the bandwidth of the PUSCH resource allocation.
(J) for the serving cell &lt; RTI ID = 0.0 &gt; (j)
) And components (j = 0 and 1) that can be provided by higher layers
). &Lt; / RTI &gt; (Re) transmission corresponding to the semi-persistent grant j may be 0 in the case of PUSCH, and (re) transmission corresponding to the dynamic scheduled grant j in the case of PUSCH may be 1 And the (re) transmission corresponding to the random access response grant j in case of PUSCH may be 2. When j = 2,
May be set based on random access procedure results,
May be a parameter provided by higher layers or may be a fixed value.
May be a downlink pathloss estimate computed at the WTRU for serving cell c.
One of the number of parameters and / or code blocks provided by upper layers, the size of each code block, the number of CQI (channel quality indicator) / precoding matrix indicator (PMI) bits, and the number of resource elements Or may be a parameter computed by the WTRU based on the above.
May be a power control accumulation term that may be cumulative of transmit power control (TPC) commands for the PUSCH over CC (c), for example.
Lt; RTI ID = 0.0 &gt; parameters (e.
) And parameters that may be provided by higher layers
May be a PUCCH format dependent value that may be a function of the number of CQIs to be transmitted, hybrid automatic repeat request (HARQ), and Scheduling Request bits. parameter(
) May be a PUCCH format dependent parameter that may be provided by higher layers.
May be a PUCCH format dependent parameter that may be provided by the upper layer if the WTRU is configured by upper layers to transmit PUCCHs on the two antenna ports,
May be a power control accumulation term that may be an accumulation of TPC commands for the PUCCH, for example.
May be a parameter provided by higher layers, and m may have a value indicating an SRS mode which may be periodic or aperiodic.
May be expressed as the number of resource blocks as the bandwidth of the SRS transmission in subframe (i) for serving cell (c). The parameters of the SRS equation having the same notation as in the PUSCH equation can use the same value as that used for the PUSCH power for the same CC (c).
The WTRU may determine (e.g., first determine) the power of each channel to be transmitted. If the sum of the channel transmit powers (e.g., determined channel transmit powers) is the configured maximum output power of the WTRU (e.g., the total configured maximum output power), the WTRU will determine that the sum of transmit powers after scaling is less than the configured maximum Output power, i. E.
The transmission power of the channels may be scaled for each rule set.
For example, the WTRU may determine that the serving cell &lt; RTI ID = 0.0 &gt; (c) &lt; / RTI &
Can be scaled.
0.0 &gt; WTRU &lt; / RTI &gt; total configured maximum output power (i)
), &Lt; / RTI &gt;
(C) for the serving cell &lt; RTI ID = 0.0 &gt;
Scaling or adjusting the transmit power may follow a set of rules that may be based on channel priority. For example, priorities may be PUCCH from highest to lowest, PUSCH with uplink control information (UCI), and PUSCH without UCI, higher priority channel may use all of the available transmit power, and next A lower priority channel may use any remaining available transmit power. If there are multiple channels of the same priority and there is not enough power for all of them, power can be equally shared between them so that the same relative power reduction is applied to each channel. Once power reduction is applied to a channel or group of channels, if the power can not be applied to the next lower priority channel, these lower priority channels may not be transmitted.
The WTRU may scale the SRS transmit power if, for example, the sum of the SRS transmit powers at two or more CCs is likely to exceed the total configured maximum transmit power of the WTRU.
The WTRU may determine the WTRU output power for the serving cell c in the lower limit and higher limit
Can be determined (or set).
The lower and upper limits can be defined, for example, as follows.
May be the maximum allowed WTRU output power that can be signaled by higher layers for serving cell c,
May not consider the tolerance as the maximum WTRU power, for example, according to its power class, and the maximum power reduction (&lt; RTI ID = 0.0 &gt;
), Additional maximum power reduction (
), Power management power reduction (
May be terms for the serving cell (c) that may cause the WTRU to reduce its maximum output power due to certain allowed reasons such as meeting emission requirements and specific absorption requirements (SARs). These values may be in dB.
In the case of carrier aggregation with UL serving cells, the WTRU calculates the total configured maximum WTRU output power (&lt; RTI ID = 0.0 &gt;
The lower and upper limits may be defined for inter-band carrier aggregation, for example as follows.
, And mprc, a-mprc, and pmprc may be linear values of
And these terms may be used interchangeably.
Measured maximum output power across the serving cell (
) May be prescribed or required to be in the following range.
T (P) may be an allowed tolerance that is a function of the value of P,
May represent the measured maximum output power for the serving cell (c) expressed in linear scale.
When a WTRU transmits over multiple CCs, it can control the transmission of SRSs in one CC based on what certain rules can be applied and transmitted in different CCs. For example, a subframe may be a cell specific SRS subframe of one CC, but not a cell specific SRS subframe of another CC. 2 shows an example in which the subframe is a cell specific SRS subframe of one CC (CC1) but not a cell specific SRS subframe of another CC (CC2).
According to an exemplary rule set as defined for LTE R10, a WTRU is scheduled to transmit SRS in one CC (e.g., CC1), and the WTRU also determines that such transmission is from another CC (e.g., CC2) If it is scheduled to transmit a PUSCH and a PUCCH (with exceptions that can be format dependent) that includes transmission at the last symbol 204, the WTRU may drop the scheduled SRS at CC1 (e.g., Lt; / RTI &gt; If the WTRU is not scheduled to transmit a PUSCH or PUCCH at CC2 or if the WTRU is scheduled to transmit a PUSCH or PUCCH at CC2 but does not include a transmission at the last symbol 204 of CC2 (e.g., (Since it is a cell specific SRS subframe for CC2), the WTRU may send the SRS 202 scheduled at CC1. The rules for the PUCCH may be dependent on the PUCCH to be transmitted, for example, the SRS transmission may have priority over the PUCCH transmission for certain PUCCH formats, such as PUCCH format 2, without HARQ-ACK.
WTRUs transmitting over multiple CCs may have different DL timing references and / or different TAs for one or more of the CCs. The timing advance group (TAG) may be a set of CCs with WTRUs having a common DL timing reference and / or a common TA.
Considering a different DL timing reference and / or a CC using a different TA, if a WTRU transmits on two or more such CCs at nominally simultaneous (i.e., nominally in the same subframe), then the subframe and inner symbol boundaries Resulting in subframes in one CC and their internal symbols superimposed on one or more other CCs. Figure 3 shows an example of multiple TAGs with different TA applied to each TAG. TAG1 is more advanced than TAG2 in Fig. It should be noted that although an example of FIG. 3 shows two CCs in each of two TAGs, there may be any number of TAGs with any number of CCs in each TAG. It should be noted that the example of FIG. 3 shows a time difference that can result in a superposition of up to two symbols, but this is for illustrative purposes only and that the time difference and superposition can be any value.
Conventionally, the transmission powers of UL channels (e.g.,
) Is determined without considering the UL timing difference between CCs. However, if there is a UL timing difference between the CCs, then these transmit powers may prevent the WTRU from exceeding the maximum transmit power if, for example, subframes of one CC overlap with neighboring subframes of another CC, and Lt; RTI ID = 0.0 &gt; and / or &lt; / RTI &gt; causing excessive interference at maximum transmit power.
The WTRU may receive uplink scheduling grants at the DL that are intended for UL transmission of the WTRU. Uplink scheduling grants received in one subframe (e.g., subframe n) yield UL transmissions in a subsequent subframe (e.g., subframe (n + 4) for LTE FDD) . The WTRU may process grants for one UL subframe at a time. In this example, for any given subframe (n + 4) where the UL scheduling grant at a certain point in time during the interval [n, n + 4] has been received in subframe n, the WTRU may demodulate and / Decoded, and can perform power processing for subframe (n + 4). Power processing includes determining transmit power of the various channels for subframe (n + 4), determining scaling to not exceed the total configured WTRU output power, determining whether to transmit the scheduled SRS, Puncturing the PUSCH and / or shortening the PUCCH to accommodate the SRS, and the like.
Hereinafter, one subframe such as subframe n + 4 is referred to as a "current" subframe, a previous subframe is referred to as a "past" subframe, and the next subframe is referred to as a "future" subframe . In some subframes prior to the current subframe, a determination may be made of the same subframe as the current subframe and may be done normally in an actual WTRU implementation. The determination of the power for the current subframe may be affected by transmissions in the past or future subframe. In the example WTRU implementation, the transmission in the past subframe (e.g., transmit power) is changed to accommodate the transmission in the subsequent (current) subframe, for example because the past has already occurred and can not be changed . In another example, a transmission (e.g., transmit power) in the current subframe may not be fully understood because the WTRU may not yet fully recognize transmissions for the future subframe if the WTRU determines for the current frame, May not be modified to accommodate transmissions in future subframes.
The above-described timing relationship of UL allocation in sub-frame n and UL transmission in sub-frame n + 4 is provided as an example, and the embodiments disclosed herein may be applied to any timing It should be noted that it can be applied to relationships. Further, the use of the subframe (n + 4) as the current subframe is for the purpose of illustration, and any subframe can be considered as the current subframe having the preceding subframe, which is the past subframe, And may still be consistent with the embodiments disclosed herein. In some embodiments, i or N is used to represent the current frame, where i-1 or N-1 represents the past subframe and i + 1 or N + 1 represents the future subframe. Other notations may be used and still be consistent with the embodiments disclosed herein.
Conventionally, the rules for the simultaneous transmission of SRS and other channels by WTRUs set to different CC phases may be used, for example, because there is no overlap (e.g., adjacent subframe overlap) due to TA differences between CCs, Assuming no difference, it can be predicted normally for UL subframe boundaries of matching (e.g., exactly or almost exactly identical) CCs. In the presence of a TA difference, conventional rules may not properly handle concurrent SRS and other UL transmissions. For example, if there is no TA difference, the WTRU may send the SRS in one CC concurrently with the shortened PUSCH in the other CC. However, if there is a TA difference, applying this rule may result in the transmission of the PUSCH in one CC and the transmission of the SRS in another CC occurring in the same symbol period. This refers to a cross-subframe collision between the SRS and another channel (between the past subframe, the current subframe, and the future subframe).
Figures 4A and 4B illustrate examples of cross-subframe collisions between SRS and other channel transmissions. 4A, the SRS 402 of the past subframe may collide with the PUSCH and / or PUCCH 406 of the current subframe, and the SRS 402 of the previous subframe may collide with the PUSCH and / The PUSCH and / or PUCCH 408 may conflict with the SRS 404 of the current subframe. When the SRS is transmitted in a more advanced TAG as shown in FIG. 4B, the SRS 412 of the past subframe may collide with the PUSCH and / or PUCCH 416 of the past subframe, The PUSCH and / or PUCCH 418 may collide with the SRS 414 of the current subframe.
Embodiments of handling SRS and other UL channels scheduled for simultaneous transmission in the case of UL timing difference are disclosed below.
In one embodiment, the WTRU may not transmit SRS concurrently with the PUSCH and / or PUCCH in the same symbol, which may be extended to neighboring symbols or adjacent subframes. Figures 5A-5C illustrate examples of transmission of SRS and other channels in the case of a TA difference of less than one symbol between CCs. In this example, the SRS is transmitted at the end of the subframe. 5A-5C, a horizontally cross-hatched symbol may not be affected by simultaneous SRS and rules for other UL channel transmissions in the case of UL timing differences between CCs (in the current frame or in the next subframe ) Additional symbols.
In FIG. 5A, the SRS 502 is scheduled in a more advanced CC. If the PUSCH and PUCCH are not mapped to both the last symbol 504 of the other CC (less advanced CC) and the next symbol 506 of the last symbol in subframe (i), then the WTRU sends the CC determined in subframe (i) SRS &lt; / RTI &gt; If the PUSCH and PUCCH are mapped to both the last symbol 504 of the other CC (less advanced CC) or the next symbol 504 of the last symbol in subframe (i) May drop the scheduled SRS (502). For example, if the WTRU does not use the last symbol 504 of the subframe (i) and the shortened PUCCH format or shortened to the other CC (less advanced CC) using the next symbol 506 of the last symbol on that CC Gt; PUSCH &lt; / RTI &gt;, the WTRU may drop the scheduled SRS (502).
In Figure 5B, the SRS is scheduled in the less advanced CC. In this case, cross-subframe interference may occur between the SRS of the current subframe and the other channels of the future subframe or between the SRS of the previous subframe and other channels of the current subframe. If the PUSCH and PUCCH are not mapped to both the last symbol 514 of the subframe (i) of the other CC (more advanced CC) and the first symbol 516 of the subframe (i + 1) i may send the SRS 512 scheduled for the CC determined in step S612. If the PUSCH or PUCCH is mapped to the last symbol 514 of the subframe (i) of the other CC (the more advanced CC) or the first symbol 516 of the subframe (i + 1) Lt; RTI ID = 0.0 &gt; 512 &lt; / RTI &gt; This may be the actual implementation because the SRS is at the end of its own subframe because it was originally decided to do this as part of the processing for the current subframe and the WTRU does not send the SRS in the current subframe at a later time I can judge it. If the WTRU decides not to send the SRS, the WTRU may invalidate any PUSCH puncturing or PUCCH short because it has originally determined to do so as part of the processing for the current subframe.
In FIG. 5C, SRSs 522 and 524 are scheduled for both CCs. In this case, cross-subframe interference may occur between the SRS of the current subframe and the other channels of the future subframe or between the SRS of the previous subframe and other channels of the current subframe. The WTRU will not use the last symbol next symbol 528 of the current subframe (subframe (i)) of the less advanced CC (e.g., PUSCH and PUCCH are not mapped) (SRSs 522 and 524) on two CCs if the first symbol 526 in the frame (subframe (i + 1)) is not used.
In Figs. 5A-5C, two CCs are used as an example only, and embodiments may be applied where three or more CCs are active for the WTRU. In this case, the WTRU may determine whether to transmit the SRS based on the scheduled transmission and UL timing relationship of two or more other CCs.
In another embodiment, the WTRU may avoid using additional symbols (horizontal cross-hatched symbols 506, 516, 526, and 528 in FIGS. 5A-5C) to cause scheduled SRSs to be transmitted . The WTRU may avoid the diagonal cross hatching symbols 504 and 516 in Figures 5A-5C to cause the scheduled SRS to be transmitted on the same CC as the PUSCH or PUCCH.
In another embodiment, additional transmission formats may be defined. For example, in a short PUSCH and / or PUCCH format that does not use the last two symbols in a subframe, a short axis PUSCH and / or PUCCH format that does not use a first symbol in a subframe, a first symbol and a last symbol Shortened PUSCH and / or PUCCH formats that do not use all can be defined.
The WTRU may use one or more of the abbreviated formats based on instructions from the network as to whether or not the use of one or more unicast formats is allowed or based on instructions from the network that the WTRU should use one or more of the unicast formats. The timing relationship between the CCs, e.g., the UL timing relationship of the WTRU.
The WTRU can maintain two states (a first state with no TA difference and a second state with a symbol TA difference less than one), one of the embodiments described above for transmission of SRS and other channels based on this state Can be implemented.
The embodiments described above can be extended to a range of, for example, one or two symbols if the TA difference is greater than one symbol. 6A-6C illustrate examples of transmission of SRS and other channels in the case of a TA difference of two or more symbols.
In FIG. 6A, the SRS 602 is scheduled in a more advanced CC. If the PUSCH and PUCCH are not mapped to both the last second and third symbols 604 and 606 of the other CC (less advanced CC) in subframe (i) And may transmit the scheduled SRS 602. If the PUSCH and PUCCH are mapped to both the last second and third symbols 604 and 606 of the other CC (less advanced CC) in subframe (i), then the WTRU will schedule for the CC determined in subframe (i) Gt; SRS &lt; / RTI &gt;
In Figure 6B, the SRS 612 is scheduled at the less advanced CC. In this case, cross-subframe interference may occur between the SRS of the current subframe and the other channels of the future subframe. If the PUSCH and PUCCH are not mapped to both the first symbol 614 and the second symbol 616 of the sub-frame (i + 1) of the other CC (the more advanced CC) Lt; RTI ID = 0.0 &gt; 612 &lt; / RTI &gt; If the PUSCH and PUCCH are mapped to the first symbol 614 or the second symbol 616 of the other CC (more advanced CC) in subframe i + 1, the WTRU will assign And may drop the scheduled SRS 612.
6C, SRSs 622 and 624 are scheduled for both CCs. In this case, cross-subframe interference may occur between the SRS of the current subframe and the other channels of the future subframe or between the SRS of the previous subframe and other channels of the current subframe. The WTRU does not use the two last symbols 630 and 632 of the current subframe (subframe i) of the less advanced CC (e.g., the PUSCH and PUCCH are not mapped) It is possible to simultaneously transmit SRSs 622 and 624 scheduled on two CCs if the first two symbols 626 and 628 are not used in the next subframe (subframe (i + 1)).
In the embodiments described above, the WTRU can maintain three states (e.g., a first state with no TA difference, a second state with less than one symbol TA difference, and a third state with two or more symbol TA differences ), And implement any of the embodiments described above for transmission of SRS and other channels based on this state.
In other implementations, the SRS may be included at the beginning rather than at the end of the subframe. FIG. 7 shows an example of cross-subframe collisions for the SRS preceding the subframe. If the SRS is in a less advanced TAG then the PUSCH or PUCCH of the current subframe may conflict with the SRS 720 of the current subframe and the SRS 704 of the future subframe may collide with the PUSCH or PUCCH of the future subframe can do. If the SRS is in a more advanced TAG, the PUSCH or PUCCH of the previous subframe may conflict with the SRS 706 of the current subframe, and the SRS 708 of the future subframe may collide with the PUSCH or PUCCH of the current subframe can do.
The WTRU may not transmit the SRS to avoid cross-subframe collisions because it may have knowledge while processing the current subframe. For example, in the case of the current subframe, the WTRU may determine not to transmit the SRS because it may conflict with the PUSCH or PUCCH of the past subframe, and the WTRU may know have. Also, at the appropriate time when processing the PUSCH and / or PUCCH of the current subframe, the WTRU may have knowledge of the SRS of the future subframe and may puncture the PUSCH of the current subframe and / SRS of the subframe can be accommodated.
Using the SRS before the subframe, the first (or first two) symbol (s) of the PUSCH need to be punctured rather than the last symbol, the abbreviated PUCCH begins at the beginning of the subframe, Lt; RTI ID = 0.0 &gt; SRS &lt; / RTI &gt; rather than ending at the end of the subframe.
In another embodiment, to avoid cross-subframe collisions, the SRS may be included in the middle of the subframe (e.g., not the first or last symbol). FIG. 8 shows an example of SRS (802 or 804) included in the middle of a subframe. If the UL timing difference is less than about half of the subframe, there may not be a cross-subframe collision, whether or not the SRS is included in a more or less advanced TAG. With the SRS in the middle of the subframe, one (or two) PUSCH symbol (s) may need to be punctured towards the middle of the subframe, and the shortened PUCCH may be split around both sides of the SRS have.
The embodiments described above may be used in the following cases: (1) when the WTRU is operating with an intra-band CA (the WTRU may be limited to having at least two activated UL CCs), (2 ) Where the WTRU is operating with an inter-band CA (which may be limited to the case where the WTRU activates UL CCs in two or more bands), (3) the WTRU has two or more independent control TA loops (E.g., the WTRU has at least two TAGs), or (4) the WTRU is specifically instructed by the eNB to apply embodiments (via RRF or other signaling) Can be applied.
The embodiments described above for SRS and other UL transmissions can always be applied if at least one of the above conditions ((1) - (4)) is true. Also, if one of the conditions ((1) through (4)) is true and the difference between the most applied TA and the least applied TA (e.g., length of overlap region, TA difference, Timing difference) is larger than the threshold value, the above-described embodiments can be suitably applied.
If the difference used in the judgment is below the threshold, for example, the embodiments may not apply even if the above-mentioned conditions are true. Hysteresis may be employed (e.g., two different thresholds may be used, one threshold for initiating use of these embodiments and another threshold for interrupting the use of these embodiments). After signaling the conditions guaranteeing that the embodiments are applied or not applied, the embodiments may be applied, starting with a certain subframe such as subframe (k + 4) after reporting the conditions in subframe k It may not apply. After signaling the conditions ensuring that the embodiments are applied or not applied, the WTRU performs the following steps, starting with a certain subframe such as subframe (k + 4) after receiving the HARQ ACK of the report in subframe k Embodiments may or may not be applied after signaling conditions that warrant applying or not applying the examples.
If the TA (or UL timing) difference is compared to a threshold, the magnitude of the difference may be appropriate (e.g., it may not matter which CC is more or less advanced).
For appropriate UL communications, the eNB may need to recognize the rules that the WTRU has applied to its UL transmission, such as rules that the WTRU has applied to concurrent SRS and other channel transmissions. Because the eNB knows whether it is used or not in any given subframe, the eNB can calculate or infer the TA (or UL timing) difference at the WTRU.
For a WTRU using one common DL timing reference, the WTRU and eNB may calculate or calculate a maximum (e.g., the largest of the CC) TA difference in the WTRU as a difference between Rx-Tx time difference measurements at each CC, I can reason. The maximum TA difference can be calculated as follows.
Where TAp may be an Rx-Tx time-difference measurement for one cell (e.g., PCell) and the TAs may be an Rx-Tx time-difference measurement for another cell (e.g., SCell). The WTRU may report such measurements for one or more cells to an eNB for which reporting (e.g., reporting parameters, reporting content, etc.) may be based on signaling from the eNB (e.g., measurement configuration).
For WTRUs that use different DL timing criteria for two or more CCs (e.g., PCell and one or more SCell), the WTRU and eNB calculate the maximum TA difference in the WTRU using the same approach as the common DL reference case Or inferences. In addition, the WTRU and eNB may measure or determine the UL timing difference as subtracting the received DL reference timing difference from the applied TA difference. For example, the WTRU and Enb may provide a time difference (e.g., DELTA TREF = TREFp-TREFs) between the reference of two cells or two TAGs, or may provide a reference signal time difference (RSTD) You can add a RSTD type measurement per TAG or SCELL to compute the UL timing difference with subtracted measurements (for example, (TAp-TAs) - (TREFp-TREFs)).
Figure 9 shows an example of the use of measurements to determine the TA difference between two cells (e.g., PCell and SCell). It can be appreciated that the term? TAps can be referred to as? TA, where the difference is between two CCs (e.g., a primary CC and a secondary CC) of two different TAGs or two separate TAGs.
The WTRU may calculate, process, and / or report the ΔTA as described above or in a simpler manner (eg, ignoring the timing reference difference). The WTRU may utilize the difference of the actual timing advance applied to multiple CCs or TAGs using timing advance commands received from the eNB (e.g., accumulated timing advance commands) and to ignore the WTRU's own uplink timing adjustments But instead calculate, process, and / or report ΔTA as described above.
In another embodiment, the WTRU may calculate the TA or UL timing difference and report to the Enb. These reports can be used by the WTRU to initiate or stop special processing for large TA differences, or by disabling the problematic SCell (s) in the TAG, for example, by scheduling policies in cell load balancing, May be combined with reports using predictions that the large TA differences that would conflict with transmissions will be avoided (the timing reference may be PCell).
The WTRU may be configured to determine the TA or UL timing of the CCs or TAGs, the TA or UL timing difference between the two CCs or TAGs, the maximum TA or UL timing difference between any two CCs or TAGs, the PCell for any SCELL TAG UL timing differences, UL timing differences associated with PCell for any SCELL TAGs configured to report such UL timing teeth, TAGs (e.g., a list of TAGs in the most advanced order, or vice versa, or a representation of the most advanced TAGs) (For example, when the maximum TA or UL timing difference crosses the threshold), a state where the predetermined large TA difference is processed, or if the TA or UL timing difference crosses the threshold , An entry that just enters or leaves (which may be combined with an indication or report of a TAG timing difference), etc., periodically or event-driven It can gohal.
An event that triggers a report can be triggered by activating the first SCell of the TAG (e.g., the start of an additional TAG to start periodic reporting) or deactivating the last SCELL of the TAG (e.g., a TAG ). &Lt; / RTI &gt; These reports may be subject to PHY signaling, MAC CE (control element), or RRC signaling. Reports carried in the MAC CE can be sent with power headroom reports for the interested SCell TAG.
Embodiments for handling transmit power in the presence of UL timing difference or TA difference are disclosed below.
Conventional rules for preventing the WTRU from exceeding the maximum allowed output power (e.g., the total configured maximum output power) when transmitting on multiple CCs are, for example, an overlay due to a TA difference between the CCs (E. G., Precisely or nearly exactly coincident) CCs, assuming that there is no TA difference or no TA difference between the subframe boundaries (e. G., Adjacent subframe overlaps). However, when there is a TA difference, applying the conventional maximum power rules is not sufficient in all cases.
For example, if there is a TA difference between CCs, there may be simultaneous transmission of SRS in one CC and PUSCH and / or PUCCH in another CC due to adjacent subframe overlap. For example, for up to 60 μs of TA difference, which can correspond to approximately 84% of the symbol period in which the SRS can be transmitted, there is an uplink transmission of the SRS in one CC and the PUSCH and / or PUCCH in the other CC . This is not considered in the conventional maximum power rule.
In another example where there is a TA difference between the CCs, the PUSCH in one CC may share power with the PUSCH of another CC in a nominally adjacent subframe. Which is not considered in conventional maximum power rules or PUSCH scaling rules.
In the embodiments described herein, the maximum power may be replaced by a configuration maximum power, a configuration maximum output power, a total configuration maximum output power, a total configuration maximum WTRU output power, and other similar terminology. These and other similar terms may be used interchangeably.
In one embodiment, for a subframe without SRS, without a PUSCH with UCI, the PUSCH power can be scaled as follows.
Is a function of a number of variables, and each variable may be nominal channel power in the current subframe and in the adjacent subframe. E.g,
Can be as follows.
Here, i is the current subframe (i.e., the subframe where the powers can be calculated), j = i-1 for CC with less TA (or less advanced UL timing), and more TA J = i + 1 for CC with advanced UL timing). Instead of the max (x, y) function in the above example, a different function, for example a weighted average of the PUSCH power in each of the two subframes, may be employed. This weighting may be, for example, a function of the TA (or UL timing) difference between the two CCs.
Where TA is the TA difference in microseconds.
In any of the embodiments disclosed herein, any or all power terms (e.g.,
) Is a function of these terms in some or all of the power control formulas
If the PUSCH and / or PUCCH overlap with the SRS due to the UL timing difference, then the SRS may be adjusted or scaled to avoid exceeding, for example, the maximum allowed power (e.g., WTRU total configured maximum output power) have.
If the SRS is a more advanced CC (as shown, for example, in FIG. 5A), there is no transmission on the diagonal cross hatched symbol 504 and transmission on the horizontal cross hatched symbol 506 is If present, the SRS power at that CC is equal to the available transmit power at CC (e.g.,
&Lt; / RTI &gt; of the other channels in the CC. Some of which may be a function of the TA (or UL timing) difference between CCs. For example, the SRS power can be set as follows.
Is a symbol period (e.g., 83.3 mu s for an extended CP or 71.4 mu s for a normal CP) and satisfies the following equation.
It should be noted that TA and DELTA TA may be replaced with UL timing and UL timing differences, respectively, in any of the embodiments disclosed herein.
In the case of transmission of both the horizontal and diagonal cross-hatched symbols 504 and 506 in FIG. 5A, the SRS power can be set as follows.
If the SRS is a less advanced CC (as shown, for example, in FIG. 5B), there is no transmission in the diagonal cross hatched symbol 514, but the transmission in the horizontal cross hatched symbol 516 is If present, the SRS power can be set as follows.
Where j = i + 1.
If it is a transmission of both horizontal and diagonal cross-hatched symbols 514 and 516, the SRS power can be set as follows.
If SRS is transmitted on both CCs (as shown in FIG. 5C, for example), then there is a transmission in horizontal cross-hatched symbols 526 and 528, the SRS power per CC is more and less Each SRS in the advanced CC may be set for each of the above embodiments, and then scaled as follows.
Embodiments disclosed herein may reflect SRS having a lower priority than PUCCH or PUSCH.
In the above equations, the factor treated as a weighting factor as a function of the TA difference between CC (
Other factors may be employed as an example.
To enable simultaneous transmission of PRACH and other channel (s), the above inequality may be modified as follows.
(I) &lt; / RTI &gt;
(It can only be 0 in the last or the subframe of the preamble).
Alternatively, the SRS
The SRS may drop rather than scaling the SRS.
If it is determined that the SRS and PUCCH and / or PUSCH can be scheduled in the current frame, it is determined to use the short PUCCH format and / or to shorten the PUSCH to allow transmission of the scheduled SRS, If the WTRU determines that the power constrained WTRU does not transmit the SRS of the current subframe due to the partial overlap of the PUSCH, PUCCH, or PRACH of the next subframe, the WTRU may change the PUCCH and / or PUSCH of the current subframe to the original format and / Can be restored. Alternatively, the WTRU may not restore the PUCCH and / or PUSCH.
For a Carrier Aggregation (CA) with UL serving cells, the WTRU computes the total configured maximum WTRU output power &lt; RTI ID = 0.0 &gt;
In one embodiment, the WTRU adds the additional power backoff term (e.g., the MPR term) to the lower limit of the configured maximum WTRU output power for the CA, thereby exceeding the maximum power if TA (or UL timing) Can be avoided. This can actually handle power from past subframes superimposed on the current subframe as a higher priority by reducing the transmit power available to the scheduled channels for the current subframe.
FIG. 10 shows an example in which there may be interference between the past subframe and the current subframe. 10, the WTRU determines how much interference the past subframe of TAG1 to the current subframe 1002 of TAG2 and how much interference the current subframe of TAG2 to the current subframe 1004 of TAG1 But it may be impossible to know how much the future subframe of TAG2 may cause interference with the current subframe 1006 of TAG1, which can be ignored.
In the current subframe, the transmission power of the past subframe may be known, but the transmission power of the future subframe may not be known. Since the transmit power of the past subframe has already been determined, the WTRU backoffs the maximum transmit power available in the current subframe for the current subframe to accommodate the transmit power of the past subframe superimposed on the current subframe have. The power superimposed from the past subframe to the current subframe, averaged over the entire current subframe,
(E.g., excessive adjacent channel or out-of-band interference) of the superposition that may be generated by the WTRU during a relatively brief overlap period is averaged over the subframe duration .
For any given CC, the interference power from the overlapping subframe may be due to a different CC. therefore,
Instead of applying a back-off to a configured maximum WTRU output power for a serving cell (c) for a subframe (i), for example,
A backoff may be applied to the WTRU as a whole as a factor to reduce the total configuration maximum WTRU output power (e.g., total configured WTRU output power for subframe (i)). For example,
Backoff can be applied to the lower limit of For example, in the case of carrier aggregation such as inter-band carrier aggregation (e.g., having at most one serving cell per operating band)
Lower bound of
) May be referred to as TA maximum power reduction (T-MPR) or tmpr, where T-MPR is the dB value and tmpr may be the linear value of the T-MPR) In one embodiment,
May be included in the mathematical formulas used to determine &lt; RTI ID = 0.0 &gt; For example, for an interband CA or a non-adjacent band CA,
Can be determined as follows.
Alternatively, it can be determined in another way as follows.
Alternatively, backoff may be performed (e. G., For in-band carrier aggregation or in-band neighboring CAs)
Can be included at the lower end of
In any of the embodiments described above, the T-MPR (or tmpr) may have the same or CC specific value for all CCs.
May be initially determined without consideration of overlap, and then based on the overlap, the backoff may be applied to PCMAX as follows.
(I) in the subframe &lt; RTI ID = 0.0 &gt;
(I) that occupies the overlap
(I) &lt; / RTI &gt; representing the overlap in sub-frame (i)
Can be written as follows.
In linear form, it can be written as
In this case, the determination of scaling for exceeding the maximum power and / or power control
Can be determined without consideration of overlap, and then the backoff can be applied as follows.
(For example, in the case of band-to-band CA) can be calculated as follows.
Alternatively, P CMAX_L_CA (for example, in the case of band-to-band CA) can be calculated as follows.
The addition of an additional backoff T-MPR (or tmpr, which can be in linear form), which may be in dB form, allows the WTRU to lower the configured maximum output power or lower the configured maximum output power itself, Or the effect of a TA (or UL timing) difference that may cause the configured maximum output power to exceed a predetermined measurement period (e.g., 1 ms).
In another embodiment, the additional backoff
Lt; RTI ID = 0.0 &gt; and / or &lt; / RTI &gt; For example, for in-band CA and / or band-to-band carrier aggregation (e.g. with up to one serving cell c per operating band)
Can be calculated as one of the following.
The T-MPR may be a power reduction value or power reduction tolerance so that the WTRU may select an actual decrease value below the allowance value.
A value from a set where the amount of T-MPR allowed or actual power backoff is 0 dB, a fixed value, or a value that may include two or more values (for example, 0 if ΔTA is small and any value if ΔTA is large) . The T-MPR may be selected by the WTRU from the list, for example. This list may be specific to or provided by the WTRU by the network. The network may signal an index into the list to use as a WTRU (e.g., via physical layer signaling, MAC CE, RRC signaling, etc.). The WTRU may also determine the index itself as a function of, for example, DELTA TA. An example of fixed values or lists is {0, 1} dB or {0, 0.5, 1.0} dB.
The WTRU may determine the T-MPR as a function of the transmit power of the previous subframe as well as or instead of the &lt; RTI ID = 0.0 &gt; ATA. &Lt; / RTI &gt; For example, in the case of any predetermined ΔTA, the smaller the transmission power in the subframe (i-1), the smaller the T-MPR in the subframe (i).
The T-MPR uses the number of TAGs having the CC activated with one or more of the past, current, and future subframes, the number of TAGs having one or more scheduling UL transmissions of past, current, and future subframes , Or the number of bands of CCs having UL transmissions of one or more of the past, present, and future subframes.
The T-MPR may be applied only in subframes with potential overlaps (e.g., for the WTRU to transmit at least one TAG of the current subframe and UL of the TAG other than the TAG of the past or future subframes) If scheduled).
T-MPR may be a function of one or more of? TA (or UL timing difference) between CCs of different TAGs. For example, T-MPR may be a function of the largest ΔTA (or UL timing difference) between each pair of TAGs. This may be applied to TAGs having UL transmissions in one or more of the current, past, or future subframes. A larger ΔTA (or UL timing difference) may result or correspond to a larger T-MPR.
The T-MPR may be a function of the overlap amount, for example a subframe time (which may exclude the CP time) or a function of the overlap time divided by the time for the symbols.
The WTRU may determine the T-MPR for the current subframe as a function of the transmit power of the past subframe and / or the transmit power of the future subframe. The transmit power of the past subframe may be the actual determined transmit power that may be after any scaling has been done and may not account for or explain the determined T-MPR for that subframe. The transmit power of the future sub-frame may be the transmit power calculated for that sub-frame, which may be after any scaling, and may not account for or account for the T-MPR for that sub-frame.
The WTRU sends the
And / or &lt; / RTI &gt;
MPR for the current subframe as a function of the T-MPR. Used in past subframes
May not occupy or occupy the determined T-MPR for that subframe. For future subframes
May not occupy or occupy the T-MPR for that subframe.
After the WTRU has determined the T-MPR, the WTRU may determine the actual backoff value to use. The WTRU may determine the T-MPR tolerance and / or the actual backoff based on the subframe.
In the above-described embodiment,? TA can be replaced with a UL timing difference.
The determination of the PUCCH transmit power for subframe (i) and the scaling rules for PUSCH transmit power are used for PCell
And not greater than. However, PCell
Using the backoff of the T-MPR applied to the T-MPR, this assumption need not be true. For PCell
But larger than
The WTRU may determine the PUCCH power in the first scaling step, for example, as follows.
Alternatively, the PUCCH power may be determined as follows.
Where c is the CC to which the PUCCH can be sent, e.g. PCell.
, The following can be performed.
Lt; RTI ID = 0.0 &gt; Equation
According to the PRACH preamble format
The PRACH transmission can be continued for a certain period indicated by &lt; RTI ID = 0.0 &gt; These periods are nominally one to three subframes. During the last subframe of a 2-subframe or 3-subframe transmission or a single subframe of a 1-subframe PRACH transmission, the PRACH transmission may be terminated before the end of the last subframe or a single subframe. The number of total sub-frames and the unused portion of the last sub-frame or single sub-frame for each preamble format may be as given in Fig. 1, for example. For example, the PRACH preamble format 1 transmission may last for about 48% of one full sub-frame and then the second sub-frame.
The PRACH of the past subframe may or may not have any effect that needs to be included when determining the T-MPR for the current subframe. The PRACH transmission may occupy the entire past frame (e.g., PRACH preamble format 1, 2, or 3) unless it is the last subframe of the multiple subframe PRACH. In this case, the influence of the PRACH of the past subframe may be similar to the PUSCH and / or PUCCH of the past subframe. However, if the previous subframe is a single subframe of the PRACH transmission (e.g., for PRACH preamble format 0 or 4) or the last subframe (for example, for PRACH preamble format 1, 2, or 3) , There may or may not be an overlap of the past PRACHs for the current subframe.
11 shows an example of superposition of past subframes for the current subframe. In this example, ψ is the length of the PRACH transmission of the past subframe. ψ is the case of the last PRACH frame
Sec and for other PRACH frames is 0.001 second.
Is the length of the PRACH preamble CP portion,
Is the length of the PRACH preamble sequence portion, and mod () is a modulo operation. A part of the PRACH power of the past subframe superimposed on the current subframe may be as follows.
Where p is the PCell of the subframe (i).
The WTRU may use the factor Q (i) to determine the impact of the PRACH of the previous subframe on the T-MPR for the current subframe.
The determination of scaling rules for PUCCH power and PUSCH transmit power for subframe (i)
And not greater than. However, in the serving cell that transmits the PRACH
Using the backoff of the T-MPR applied to the T-MPR, this assumption need not be true. For the serving cell (c)
The WTRU may determine the PRACH and PUCCH power based on the following priority rules.
For a PRACH with a higher priority than the PUCCH, the WTRU may determine the PRACH and PUCCH power as follows.
An alternative to the equation (47) is the following equation.
Here, the factor
May occupy the PRACH length of the subframe (i) lower than the entire subframe according to the PRACH preamble format. For example, this factor may be the ratio of the length of the PRACH preamble in subframe (i) to the length of the subframe, or another value
to be. If it is a subframe (i) that is not the last subframe of the PRACH preamble format, such as Format 1, 2, or 3, the factor may be unity.
For a PUCCH with a higher priority than the PRACH, the WTRU may determine the PRACH and PUCCH power as follows.
In another embodiment, the WTRU is configured for serving cell &lt; RTI ID = 0.0 &gt; (c)
Can be calculated. The WTRU
Can be calculated as follows.
May be the configured WTRU transmit power for sub-frame (i) of the primary cell,
May be the downlink path loss estimate computed in the WTRU for the primary cell.
If the total transmit power of the WTRU is
, Then the WTRU is configured for serving cell (c) of subframe (i) such that the following condition is satisfied:
Can be scaled differently.
May not be included. If there is no PRACH transmission in subframe (i)
If the WTRU has a PUSCH transmission with a UCI on the serving cell j and a PUSCH transmission with no UCI in either of the remaining serving cells and the total transmit power of the WTRU is
, Then the WTRU shall notify the serving cell for UCI-free serving cells in subframe (i)
May not be included, and if there is no PRACH transmission in subframe (i)
If the WTRU has a PUCCH and PUSCH concurrent transmission with a UCI on the serving cell j and a PUSCH transmission with no UCI in either of the remaining serving cells and the total transmit power of the WTRU is
, Then the WTRU may be configured as follows
The WTRU may report the power headroom to the eNB. The WTRU may include an indication in a power headroom report that a non-zero T-MPR has been used. There may be one indication for the WTRU. Alternatively, there may be one indication for each TAG, or for each CC, or for each CC having the actual headroom included in the report.
If the eNB is included in the power headroom report (for example,
From other factors such as &lt; RTI ID = 0.0 &gt;
If the WTRU can not determine itself,
The WTRU may (1)
Is included in the power headroom report for an in-band CA or an intra-adjacent band CA, for example.
Not equal to one or more of the values; Or (2)
Included in Power Headroom Report
If the sum is not equal to the sum of the values (for example, if the sum is, for example, between inter-band CAs or CAs within non-adjacent bands
May be capped by a &lt; RTI ID = 0.0 &gt;
The WTRU
May be included in the power headroom report.
The WTRU may trigger a power headroom report if the actual backoff due to the overlap changes by more than a threshold. A trigger in a given subframe may require an actual UL transmission (e.g., PUSCH, PUCCH, or PRACH) in more than one TAG in that subframe. A trigger in a given subframe may require an overlap condition between two or more TAGs in that subframe. The overlap condition may require UL transmission (which may be one or more of PUSCH, PUCCH, and PRACH) in at least one TAG of the current subframe and at least one other TAG in the previous and / or next subframe. The comparison start subframe may be the most recent subframe in which the power headroom report has been sent and the WTRU has had an actual UL transmission at more than one TAG. The comparison initiating subframe may be the most recent subframe in which the power headroom report has been sent and the WTRU has had an overlap condition.
In Power Headroom Reporting
Is not limited to the case described above with respect to the use of the T-MPR.
In the above-described embodiment,
In one embodiment, the following conditions:
(E. G., A subframe or TTI (i) for which a power headroom report is to be sent), the WTRU sends a power headroom report
. The WTRU may send a power headroom report if one or more of the conditions described above is not met
In another embodiment, the following conditions are satisfied:
If this is the case, the WTRU sends a power headroom report (e.g., a power headroom report to the subframe or TTI (i) to be sent)
. &Lt; / RTI &gt; The WTRU may report to the power headroom report if this condition is not met.
The above-described embodiments can be applied to band-to-band CA and / or non-adjacent band CA. The embodiments described above can be applied to power headroom reporting of a sub-frame or TTI with WTRUs having an actual UL transmission for at least two CCs in at least one of different bands, different clusters, different tags,
Included in the Power Headroom Report
Values that may include PUSCH and / or PUCCH transmissions of a subframe (or TTI) (e.g., a subframe or TTI (i)) of a power headroom report and not including PRACH and / or SRS transmissions Power headroom report for an active CC with UL transmissions
Values, or a PUCCH and / or PUCCH transmission of a subframe (or TTI) (e.g., a subframe or TTI (i)) of a power headroom report (PHR) (E. G., Used to encapsulate) the power of the channels of the active CCs with UL transmission
Can be one or more of the values
Values (or their linear equivalents).
Type 1 and type 2 power headroom reports,
For a PCell that can have a value,
Sum (for example,
) That can be used
The values are (1) sent in the reporting headroom report for PCell when only one is sent
(2) if there is a PUSCH transmission rather than a PUCCH transmission on the PCell of the subframe in which the power headroom report is to be sent,
(3) if there is a PUCCH transmission other than a PUSCH transmission on the PCell of the subframe to which the power headroom report is to be sent,
(4) if there is both a PUCCH transmission and a PUSCH transmission on the PCell of the subframe to which the power headroom report is to be transmitted,
, Or (5) the power headroom report is used for power calculations for the channel of the PCell of the subframe to be transmitted (e. G., Used for capping them)
Instead of or in addition to applying a back-off to the serving cell in the TAG. The power backoff
And can be displayed as
In addition to the foregoing, the following may be applied.
The T-MPR can be applied to the serving cells of the more advanced TAG and to the serving cell of the less advanced TAG.
T-MPR and / or T-MPR c (e.g.,
Can be applied for a short period of time (e.g., during the duration of the SRS, during the overlap period between the TAGs, or during the overlap period and the transient period).
The WTRU may generate guard symbols between subframes to avoid overlapping channels (e.g., in the current subframe of the more advanced TAG). The WTRU may puncture the PUSCH and / or shorten the PUCCH, thereby not transmitting the PUSCH and / or PUCCH in the TAG for the first one or two symbols of the current subframe, for example. 12 shows an example of a guard symbol 1202 included in the current subframe in the more advanced CC.
Guard symbols may be used if any of the above conditions are met to drop the SRS in the overlap region. Alternatively, or additionally, if there is a transmission in the TAG that is less advanced in the past subframe and a transmission in the TAG that is more advanced in the current subframe, and / or if the sum of the transmit powers is
, The WTRU may include guard symbols.
The guard symbols may be the first symbol and the last symbol of the subframe in SCell in the sTAG. Alternatively, if there is a transmission in any SCell or PCell in the pTAG in the previous subframe that is scheduled to use or use the last symbol of that subframe, the guard symbols are the first symbol of the subframe in SCell at the sTAG . An example of a transmission that is scheduled to use the last symbol in a subframe but is not used is an SRS that was not transmitted due to, for example, transmission power constraints. Alternatively, if there is a transmission in any SCell or PCell in the pTAG in the next subframe, the guard symbol may be the last symbol in the subframe in SCell in sTAG. In these cases, the WTRU and / or the eNB may not need to know or determine which CC or TAG is more or less advanced.
For fixed PRACH power over the entire PRACH preamble, the PRACH preamble transmission power (
) Can be determined as follows.
Here, the sub-frame j may be the first sub-frame of the preamble,
Lt; / RTI &gt; may be the configured WTRU transmit power for sub-frame (j) of serving cell c,
May be the downlink path loss estimate computed at the WTRU for serving cell c.
May be in dB.
Equation (63) can be expressed as follows.
Where subframe i may be any subframe of the preamble, j may be the first subframe of the preamble,
May be the downlink path loss estimate computed at the WTRU for serving cell &lt; RTI ID = 0.0 &gt; (c). &Lt; / RTI &gt;
May be in units of dBm.
(For example, &lt; RTI ID = 0.0 &gt;
Additional processing may be performed.
Here, the subframe (j) may be the first subframe of the PRACH preamble.
Also, among other channel power terms
Such subtraction may be performed, for example,
Lt; RTI ID = 0.0 &gt; linear &lt; / RTI &gt;
There may be transient periods at the beginning and / or end of the subframes, among which the power requirements of the subframes may not apply. Examples of transient periods without SRS and transient periods with SRS are shown in Figures 13 and 14, respectively.
In one embodiment, transient periods (e.g., between slots and / or subframes) may be extended. (E.g., unconditionally in the case of band-to-band operation) if the TA difference exceeds the fixed threshold, exceeds the signaling threshold, or there is no threshold test (e.g., between UL transmissions on different CCs) Periods can be extended. Figures 15 and 16 illustrate examples of extended transient periods for non-SRS transmission and SRS transmission, respectively.
Hereinafter, embodiments for applying per-symbol scaling are disclosed. Scaling per symbol is
Lt; RTI ID = 0.0 &gt; scaling &lt; / RTI &gt;
The eNB may need to know that the WTRU applies scaling per symbol. The above-described embodiments in which the eNB knows that the WTRU applies the rules to drop the SRS can be employed for this purpose. Scaling per symbol can be applied when there are two or more TAGs regardless of their TA differences.
In the case of scaling per symbol, in one embodiment, all symbols in the superposition can be scaled by the same factor. This factor can be known to both the WTRU and the eNB. This factor can be a function of the number of CCs in the overlap. The number of CCs may be the number of constituent CCs, the number of active CCs, or the number of CCs having grants in the affected subframe. For shortened subframes or formats, the number of CCs may be the individual number of CCs with symbols transmitted in the superposition. This may be limited to the number of CCs for each of these definitions using quadrature amplitude modulation (QAM).
The scale factor per symbol may be 1 / K, where K may be the number of CCs described above. The symbols in the overlap region (e.g., the last symbol of the subframe in the less advanced TAG and the first symbol of the next subframe in the more advanced TAG) may have their own power scaled by 1 / K. FIG. 17 shows an example where scaling per symbol is applied to overlapping symbols. In this example, two CCs in TAG1 (a more advanced TAG) and two CCs in TAG2 (a less advanced TAG) are shown, and symbols 1702 are symbols to which scaling per symbol is applied.
Alternatively, a scale factor? / K may be used, where? May be a signal that is signaled to the eNB by the WTRU, signaled to the WTRU by the eNB, or a constant that can be specified. alpha is
Not only to apply scaling per symbol as described above but also to manage the average power of each CC so that it can be the same before and after applying scaling per symbol to the symbols of the overlapping part, The power of the symbols may be scaled by a different factor. For example, the symbols in the overlapping region and the remaining symbols are
May be 6 or 7, as the number of SC-FDMA symbols in a slot of a subframe.
Two scaling factors (&lt; RTI ID = 0.0 &gt;
(Which may be used to scale the symbols in the overlapping region) and
(Which can be used to scale the remaining symbols)) is as follows.
Alternatively, in the case of scaling per symbol, the first or last symbol of a subframe (or another subset of symbols in a subframe that may be a fixed subset or a subset dependent on the superposition)
), And the remaining symbols may not be scaled because reason may be, for example,
) &Lt; / RTI &gt; are &lt; RTI ID = 0.0 &gt;
Lt; RTI ID = 0.0 &gt; 1 &lt; / RTI &gt;
The embodiments described above for per-symbol scaling may be limited to CCs using QAM in separate overlaps.
If there is transmission in more than one TAG, then the power scale factor can be applied as the first and last symbol of the CCs in the TAG. Alternatively, if there is no transmission of another TAG in the last symbol of the previous subframe and / or if there is any transmission of another TAG in the first symbol of the next subframe, the first and last symbols of the CCs in the TAG A power scale factor may be applied. Alternatively, if there is no transmission of another TAG in the last symbol of the previous subframe, the power scale factor may be applied to the first symbol by the CCs in the TAG, and the power scale factor may be applied to the first symbol of the next subframe, If there is a transmission, the power scale factor may be applied to the last symbol of the CCs in the TAG. In these embodiments, per-symbol scaling can be applied regardless of which TAG is more or less advanced.
Power scale factors (e.g.,
&Lt; / RTI &gt; is applied to both the first symbol and the last symbol, the power of the remaining symbols of the subframe may be different from the power scaling factor (e.g.,
) To keep the average power of each CC equal before and after applying power scaling to the first and last symbols. The first subscript refers to symbols in superposition or the remaining symbols as described above, and the second subscript means a two-symbol case.
The two power scaling factors, including the constant [alpha], can be written as follows.
The embodiments described above
Lt; RTI ID = 0.0 &gt; K &lt; / RTI &gt; for the first symbol and the last symbol of the subframe marked &quot; In this case, the power scale factors may be, for example,
May be a power scale factor applied to the first symbol of the subframe,
Is a power scale factor applied to the last symbol of the subframe,
May be a power scale factor applied to the remaining symbols of the subframe. Parameters (
/ alpha and
/ alpha. &lt; / RTI &gt;
Scaling per symbol may be applied conditionally, for example when there are two or more TAGs or when there are certain types of transmissions in a subframe (e.g., 16-QAM or 64-QAM).
Scaling per symbol may be applied in a manner to avoid unnecessary scaling if there is a scheduled SRS transmission. For example, if one scale factor, 1 / K, is used, there is a 64-QAM transmission in any cell of the subframe N and a transmission in the last symbol of the subframe N-1 in a different TAG The WTRU may scale the power of the first symbol of the channels transmitted in the subframe N by 1 / K and the power of the first symbol of the last symbol of the subframe N If there is a 64-QAM transmission and there is transmission in the first symbol of subframe N + 1 in a different TAG, then the WTRU may reduce the power of the last symbol of the PUCCH and / or PUSCH transmitted in subframe N by 1 / K can be scaled.
If the compensation factor has UCI
To compensate for the small loss caused by scaling per symbol, for example as follows.
Where x is a compensation factor. The compensation factor
May be a fixed amount or a function of, or a function of, the overlap amount,
Lt; RTI ID = 0.0 &gt; scaling &lt; / RTI &gt; The compensation factor may be a constant value when scaling per symbol is performed and may be 0 dB if scaling per symbol is not performed.
Embodiments for handling maximum power during superposition are disclosed below.
In certain embodiments, the transmit power may be determined for subframe N and may include scaling. Transmission power may be determined for subframe (N + 1) and may include scaling, prior to the transmission, and possibly the allowed time for further processing described below.
In addition to or in addition to the above-described processing for subframes N and N + 1, the WTRU may further determine the number of subframes in subframe N + 1 to avoid exceeding the maximum power during superposition, Scaling, rescaling, or adjusting the transmit or transmit power of the overlapping portions of channels in the advanced TAG and possibly in the less advanced TAG in the subframe (N). 18A shows an example in which the transmit powers at the superposition are rescaled after power is determined for two adjacent sub-frames. The transmit power for subframe N and subframe N + 1 may be set by conventional scaling rules and may be set to a less advanced TAG (N + 1), for example, to avoid exceeding the maximum power during superposition The rescaling can be applied to the subframe N in TAG2 in this example and the sub-frame N + 1 in the more advanced TAG (TAG1 in this example).
Scaling, rescaling, or adjustment may be applied (e.g., using conventional scaling priorities) as follows, where i and i + 1 replace N and N + 1,
(E.g., X = PUCCH) of the subframe (i) in FIG. TAG1 is more advanced than TAG2 (e.g., for any given subframe, the channels of TAG1 are transmitted by the WTRU before the channels at TAG2). The numbering of the TAGs is for illustrative purposes, and j may be a serving cell with a PUSCH transmission with a UCI.
(I. E., I + 1) or the power limit (e.g., maximum power) for the WTRU to the sum of the powers of the channels in the overlap of subframes i and i + And may be a power limit (e.g., maximum power) for the WTRU to the sum of the power.
(Or in linear form)
) Function, for example
, Where alpha may be one. Alternatively, consider the overlap amount
Lt; / RTI &gt; alpha may be a constant and may be alpha as described above for scaling per symbol.
In the above equations, the linear power amount for the right term of the inequalities can be after the scaling is applied to the previous step.
As an alternative to using conventional scaling priorities for rescaling, the channels of subframe N in TAG2 and the channels of subframe N + 1 in TAG1 may be equally rescaled.
As an alternative to rescaling only the channels of the subframe N at TAG2 and the channels of the subframe N + 1 at TAG1, the channel in subframe N and subframe N + Can be rescaled.
In certain embodiments, the WTRU may determine the power (s) for the channel (s) of subframe N and subframe N + 1 overriding overlap and may determine power (s) for subframe N and subframe N (S) in the non-overlapping portions of (N + 1). The WTRU may determine the powers for the channels in the overlap and may use the powers for the channels in the overlap. For example, the WTRU may scale channels in non-overlapping regions apart from the overlap region (s) instead of scaling for the entire subframe and rescaling or adjusting in the overlap. The WTRU may use the same dedicated channel before scaling for overlapping and non-overlapping regions, and these channel powers may be determined by the WTRU as if no overlap existed.
The WTRU may use the maximum output power for superposition, for example
Can also be referred to as
(Or use the "i" notation
) Of the subframes N and N + 1 so as not to exceed the power of the subframes N and N + 1.
FIG. 18B shows that the transmit powers in the superposition separately from the transmit powers in the non-overlap regions are scaled and the transmit powers in the superposition
&Lt; / RTI &gt; is scaled as needed. The transmit powers for the subframes N and N + 1 outside the superposition are in the subframes N and N + 1, respectively,
Lt; / RTI &gt; is scaled as needed. The transmit powers at superposition are
Lt; / RTI &gt; is scaled as needed. Scaling is an example,
(N and N + 1) to the outside of the overlap
Such as adjusting the power or dropping the channels so as not to exceed the predetermined threshold, and still be consistent with the embodiments disclosed herein.
(E. G., Scaling or adjusting power or dropping channels) for each channel or transmit powers in the non-overlap regions and for the channels or transmit powers in the overlap region, and / Performing an associated determination for an action (e.g., determining whether a maximum power will be exceeded) is an example, actions can be taken, decisions can be taken separately or together,
Or in the subframes N and N + 1 to the outside of the overlap, respectively,
And may still be in accordance with the embodiments disclosed herein. &Lt; RTI ID = 0.0 &gt; The determination or determination of whether any maximum power is exceeded as well as any associated measures may be performed using values, sums, and linear or log-type comparisons.
May be a configuration value that may be selected by the WTRU. Higher values (e.g.,
) And a low value (e.g.,
), And / or may be defined as having a single value. Range, then the WTRU &lt; RTI ID = 0.0 &gt;
The value can be selected in the range for. In the case of nesting, the WTRU may not be allowed to exceed a selected value of the asset (e.g., for a range), a high value, or a power of a single value.
(E.g., can be applied) to overlap between sub-frames i and i + 1.
Or overlapping
The sum of the values
). &Lt; / RTI &gt; The values, sums, and comparisons may be linear or logarithmic.
May be at least one of the following, where the values, sum, and comparisons may be linear and / or logarithmic.
May be a function of the PCMAX_L_CA values for the subframe (i and / or i + 1) such as, for example, a minimum value of one or two of the two values (e.g.,
Lt; RTI ID = 0.0 &gt; i &lt; / RTI &gt; and i +
(I) for sub-frame (i) for less advanced CC &lt; RTI ID = 0.0 &gt;
(S) in the sub-frame (i + 1) of the more advanced CC (s)
The sum of the value (s) may be multiplied by the sum,
Where k = i for CC (s) in the less advanced TAG and k = i + 1 for CC (s) in the more advanced TAG. For example, for two CCs (c0 and c1), k = i for c = c0 and k = i + 1 for c = c1 in the above equation, where c0 is less advance C1 is the carrier at the TAG that is more advanced than c0.
For example, in the case of two CCs (c0 and c1), k = i for c = c0 and k = i + 1 for c = c1 where c0 is a less advanced TAG than c1 And c1 is a carrier wave in the TAG that is more advanced than c0.
May be a function of the values, e.g., the sum of the PCMAX_L, C, which is low (from the subframe (i or i + 1)) for each CC that can be overlapped,
Lt; / RTI &gt; E.g,
Can be expressed as follows.
(E.g., from a subframe (i or i + 1)) among the CCs that can be overlapped,
Value x K, where K is the number of CCs that can be overlapped, and the final value is
For example, in the case of two CCs, c0 and c1,
May be based at least on whether the overlapping CCs are in-band or in-band.
A sub-frame area or time that can be considered an overlap area, for example
May be applied and / or the area of the subframe (s) to which rules such as scaling or transmission rules for superposition can be applied may be applied to each CC or TAG, or to the beginning of each subframe for one or more CCs in each TAG And the UL timing of the end. Figure 19 illustrates an exemplary overlapping area based on UL timing. In Fig. 19, section 1902 with diagonal hatching can be considered as an overlapping region for these CCs or TAGs.
It should be noted that there may be a defined transient region for each CC, which may start before the portion considered to be the actual start of the subframe and / or end after the portion considered the actual end of the subframe. In this transient region, the power may be allowed to change from one subframe to another, and / or may be an area of a subframe that is not included in the power test. Since the power of the CC may vary over the transient region, there may be a possibility of exceeding the power limit in this region.
In one embodiment, an area that is considered to be an overlap region (e.g., for applying embodiments for handling maximum power during superposition) includes transient regions that may exist at the beginning and / or end of each subframe . Fig. 20 shows an example of transitional regions at the beginning of a subframe (i + 1) of the last and less advanced TAG (TAG1) of a subframe (i) of a more advanced TAG (TAG2). As shown in FIG. 20, the transition regions before and after the start of each subframe may be included in an area regarded as overlapping based on, for example, UL subframe timing.
The measured maximum output power for the serving cell (
) May be in the following range.
Where T (P) represents the tolerance value for power (P).
The tolerance of
A plurality of timing advances or superposition transmissions in the presence of a plurality of TAGs may be allowed. If there are two or more TAGs, or if there are two or more TAGs, then this tolerance can be applied and the timing difference between the TAGs is greater than the threshold. The tolerance can be a fixed amount, for example a fixed amount (e.g., +0.5 dB)
A quantity or a quantity being a function of another quantity being signaled by the eNB, a new quantity or quantity signaled by the eNB, and / or a function or functions thereof.
The tolerance change (which may be addition or subtraction)
Lt; / RTI &gt; can be applied to at least one of the lower limit and the upper limit. T-MPR
The additional tolerance may be subtracted from the left side of the equation (81) when there is an overlap condition in the subframe as follows.
Here, Toverlap can be a function of T-MPR or T-MPR.
1. A method for power control for wireless transmission on multiple component carriers associated with multiple timing advances.
2. The method of embodiment 1 comprising calculating a transmit power of physical channels in each subframe to be transmitted on a plurality of component carriers that the WTRU belongs to at least two different timing advance groups, Is associated with a separate timing advance value for uplink transmission.
3. The method of embodiment 2 wherein scaling the transmit power of at least one of the physical channels of each subframe is performed when the sum of the transmit powers of the physical channels in the same subframe exceeds the configured maximum WTRU output power for the subframe / RTI &gt;
4. The method of embodiment 3 wherein the WTRU is configured such that the sum of the transmit powers of the physical channels in the overlap region does not exceed the configured maximum WTRU output power for overlap, Adjusting the transmit power of at least one of the physical channels if the sum of the transmit powers of the physical channels in the overlapping region exceeds the configured maximum WTRU output power for the overlap.
5. The method of embodiment 3 or 4 wherein the transmit power of the physical channel is adjusted in order based on physical channel priority.
6. The method as in any of the embodiments 4 and 5, wherein the configured maximum WTRU output power for overlap is determined as a function of the configured maximum WTRU output power for two consecutive overlapping subframes.
7. The method as in any one of embodiments 4-6, wherein the configured maximum WTRU output power for overlap is equal to one of the configured maximum WTRU output powers for two consecutive overlapping subframes.
8. The method as in any one of embodiments 4-7, wherein the configured maximum WTRU output power for overlap is selected by the WTRU from a range of lower and upper bounds.
9. The method as in any one of embodiments 3-8, wherein the WTRU drops the SRS if the other physical channel is scheduled to be transmitted on a symbol partially or fully overlapping the SRS on any component carrier.
10. The method as in any of the embodiments 3-9, further comprising calculating a transmit power for each SRS to be transmitted on the component carriers, wherein the WTRU is configured to calculate a sum of transmit power for SRS on multiple component carriers Gt; SRS &lt; / RTI &gt; if the available power is exceeded.
11. The method as in any one of embodiments 3-10, wherein the WTRU further comprises transmitting a power headroom report to the network, wherein the power headroom report is configured such that the configured maximum WTRU output power is less than the configured maximum WTRU The configured maximum WTRU output power for the current subframe if it is not equal to the sum of the output power or the configured maximum WTRU output power for serving cells.
[0065] 12. The method as in any of the embodiments 3-11, wherein the WTRU further comprises calculating transmit power for the PRACH.
13. The method of embodiment 12 wherein the WTRU further comprises transmitting a PRACH, wherein the transmit power for the PRACH is constant over the entire PRACH preamble at a power level determined for the first subframe of the PRACH.
14. The method as in any of the embodiments 3-13, wherein a guard symbol is included in the component carrier to avoid overlapping channels.
15. A WTRU for power control for wireless transmission on multiple component carriers associated with a plurality of timing gains.
16. The apparatus of embodiment 15 comprising a processor configured to calculate transmit power of physical channels in each subframe to be transmitted on a plurality of component carriers belonging to at least two different TAGs, Gt; WTRU, &lt; / RTI &gt;
17. The system of embodiment 16 wherein the processor is further configured to add the transmit power of at least one of the physical channels in each subframe to scale the transmit power of the physical channels in the same subframe if the sum of the transmit powers of the physical channels in the same subframe exceeds the WTRU output power for the subframe. &Lt; / RTI &gt;
18. The system of embodiment 17 wherein the processor is further configured to determine whether the sum of the transmit power of the physical channels in the overlap region does not exceed the configured maximum WTRU output power for overlap, And to adjust the transmit power of at least one of the physical channels if the sum of the transmit powers of the physical channels in the overlapping region of the frame exceeds the configured maximum WTRU output power for overlap.
19. The WTRU as in any of the embodiments 17-18, wherein the processor is configured to adjust the transmit power of the physical channels in order based on physical channel priorities.
20. The WTRU as in any one of embodiments 18 and 19, wherein the processor is configured to determine a configured maximum WTRU output power for superposition as a function of the configured maximum WTRU output powers for two consecutive subframes.
21. The WTRU as in any one of embodiments 18-20, wherein the configured maximum WTRU output power for overlap is equal to one of the configured maximum WTRU output powers for two consecutive overlapping subframes.
22. The WTRU as in any one of embodiments 18-21, wherein the processor is configured to select a configured maximum WTRU output power for superposition from a range of lower and upper bounds.
23. The WTRU as in any one of embodiments 18-22, wherein the processor is configured to drop the SRS if it is scheduled to transmit on a symbol where some or all of the other physical channels overlap the SRS on any component carrier.
24. The processor as in any one of embodiments 18-23, wherein the processor calculates the transmit power for each SRS to be transmitted on the component carriers, and if the sum of transmit power for the SRS on the plurality of component carriers exceeds the available power, The WTRU being configured to drop the WTRU.
25. The processor as in any one of embodiments 18-24, wherein if the configured maximum WTRU output power is not equal to the configured maximum WTRU output power for any serving cell or the configured maximum WTRU output power for serving cells, Wherein the WTRU is configured to transmit a power headroom report to a network that includes a configured maximum WTRU output power for a subframe.
26. The WTRU as in any one of embodiments 18-25, wherein the processor is configured to calculate a transmit power for the PRACH.
27. The system of embodiment 26 wherein the processor is configured to transmit a PRACH and the transmit power for the PRACH is constant over the entire PRACH preamble at a power level determined for the first subframe of the PRACH.
28. The WTRU as in any one of embodiments 18-27, wherein guard symbols are included on the component carrier to avoid overlapping symbols.
While the features and elements have been described above in the specific combinations, those skilled in the art will appreciate that each feature or element may be used alone or in any combination with other features and elements. In addition, the methods described herein may be embodied in a computer program, software, or firmware incorporated into a computer-readable medium for execution by a computer or processor. Examples of computer readable media include electronic signals or computer readable storage media (which are transmitted over a wired or wireless connection). Examples of computer readable storage media include read-only memory (ROM), random access memory (RAM), registers, cache memory, semiconductor memory devices, magnetic media such as internal hard disks and external disks, magneto- ROM disks, and optical media such as digital versatile disks (DVDs). A processor associated with software may be used to implement a WTRU, UE, terminal, base station, RNC, or any host computer.
1. A power control method for wireless transmission on a plurality of component carriers associated with a plurality of timing advances,
A wireless transmit / receive unit (WTRU) calculates the transmit power of the physical channels of each subframe to be transmitted on a plurality of component carriers belonging to at least two different timing advance groups (TAGs) Each of the TAGs being associated with an individual timing advance value for uplink transmission;
If the sum of the transmit powers of the physical channels of the same subframe exceeds the maximum WTRU output power configured for the subframe, then the WTRU scales at least one of the physical channels of each subframe; And
If the sum of the transmission power of the physical channels in the overlapping region of the subframe of the less advanced TAG and the next subframe of the more advanced TAG exceeds the maximum WTRU output power configured for the overlap region, Adjusting the transmit power of at least one of the physical channels such that the sum of the transmit powers of the physical channels in the physical channel does not exceed a maximum WTRU output power configured for the overlap region.
2. The method of claim 1, wherein the transmit powers of the physical channels are adjusted in order based on physical channel priorities.
2. The method of claim 1, wherein the maximum WTRU output power configured for the overlap region is selected by the WTRU from a range of lower limit and higher limit.
2. The method of claim 1, wherein the WTRU is configured to drop the SRS if another physical channel is scheduled to be transmitted on a symbol that is partially or completely superimposed on a sounding reference signal (SRS) on any component carrier / RTI &gt;
2. The method of claim 1, further comprising: the WTRU calculating transmission power for each sounding reference signal (SRS) to be transmitted on a component carrier, the WTRU comprising a sum of transmit power for the SRS on a plurality of component carriers, And drops the SRS if the available power is exceeded.
2. The method of claim 1, wherein a guard symbol is included on a component carrier to avoid overlapping channels.
A wireless transmit / receive unit (WTRU) for power control for wireless transmissions on a plurality of component carriers associated with a plurality of timing advances,
A processor configured to calculate a transmission power of physical channels of each subframe to be transmitted on a plurality of component carriers belonging to at least two different timing advance groups (TAGs)
Each of the TAGs being associated with an individual timing advance value for uplink transmission,
The processor is further configured to scale the transmit power of at least one of the physical channels of each subframe if the sum of transmit power of the physical channels of the same subframe exceeds a maximum WTRU output power configured for the subframe,
The processor is further configured to, if the sum of the transmit power of the physical channels at the overlapping portion of the subframe of the less advanced TAG and the next subframe of the more advanced TAG exceeds the maximum WTRU output power configured for the overlap region, And to adjust the transmit power of at least one of the physical channels so that the sum of the transmit power of the physical channels at the site does not exceed the maximum WTRU output power configured for the overlap region.
8. The WTRU of claim 7, wherein the processor is configured to adjust the transmit power of the physical channels in order based on physical channel priorities.
8. The WTRU of claim 7, wherein the processor is configured to select a maximum WTRU output power configured for the overlapping region from a range of lower and upper bounds.
8. The method of claim 7, wherein the processor is configured to drop the SRS if it is scheduled to transmit on a symbol where some or all of the other physical channels are overlaid with a sounding reference signal (SRS) on any component carrier. Transceiver unit (WTRU).
8. The apparatus of claim 7 wherein the processor is further configured to calculate transmit power for each SRS to be transmitted on a component carrier and to drop the SRS if the sum of transmit power for SRS on the plurality of component carriers exceeds available power. (WTRU).
8. The WTRU of claim 7, wherein a guard symbol is included in the component carrier to avoid overlapping channels.
2. The method of claim 1, wherein the maximum WTRU output power configured for the overlap region is determined as a function of the maximum WTRU output powers configured for two consecutive overlapping subframes.
2. The method of claim 1, wherein the maximum WTRU output power configured for the overlap region is equal to one of maximum WTRU output powers configured for two consecutive overlapping subframes.
KR1020147015140A 2011-11-04 2012-11-02 Method and apparatus for power control for wireless transmissions on multiple component carriers associated with multiple timing advances KR101986865B1 (en)
US201161555853P true 2011-11-04 2011-11-04
US61/555,853 2011-11-04
US201261591050P true 2012-01-26 2012-01-26
US61/591,050 2012-01-26
US201261612096P true 2012-03-16 2012-03-16
US61/612,096 2012-03-16
US201261644726P true 2012-05-09 2012-05-09
US61/644,726 2012-05-09
US201261677750P true 2012-07-31 2012-07-31
US61/677,750 2012-07-31
US201261705436P true 2012-09-25 2012-09-25
US61/705,436 2012-09-25
PCT/US2012/063422 WO2013067430A1 (en) 2011-11-04 2012-11-02 Method and apparatus for power control for wireless transmissions on multiple component carriers associated with multiple timing advances
KR20140091733A KR20140091733A (en) 2014-07-22
KR101986865B1 true KR101986865B1 (en) 2019-06-07
ID=47351934
KR1020147015140A KR101986865B1 (en) 2011-11-04 2012-11-02 Method and apparatus for power control for wireless transmissions on multiple component carriers associated with multiple timing advances
KR1020197015493A KR20190064673A (en) 2011-11-04 2012-11-02 Method and apparatus for power control for wireless transmissions on multiple component carriers associated with multiple timing advances
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