CN111903159A - Method, apparatus and computer program - Google Patents

Method, apparatus and computer program Download PDF

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Publication number
CN111903159A
CN111903159A CN201880091775.0A CN201880091775A CN111903159A CN 111903159 A CN111903159 A CN 111903159A CN 201880091775 A CN201880091775 A CN 201880091775A CN 111903159 A CN111903159 A CN 111903159A
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Prior art keywords
control element
uplink carrier
power headroom
network
cell
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Granted
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CN201880091775.0A
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Chinese (zh)
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CN111903159B (en
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S·图尔蒂南
吴春丽
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Nokia Shanghai Bell Co Ltd
Nokia Oyj
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Nokia Shanghai Bell Co Ltd
Nokia Networks Oy
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • H04W52/365—Power headroom reporting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/54—Signalisation aspects of the TPC commands, e.g. frame structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/32—TPC of broadcast or control channels
    • H04W52/325—Power control of control or pilot channels

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

There is provided a method comprising: providing, from a user equipment to a network, a first control element comprising power headroom information for a first uplink carrier associated with a cell; determining whether a second carrier associated with a cell exists; and, if present, providing a second control element from the user equipment to the network, the second control element comprising power headroom information for a second uplink carrier, wherein the first control element and the second control element are separate control elements.

Description

Method, apparatus and computer program
Technical Field
The present application relates to a method, apparatus, system and computer program, particularly but not exclusively to reporting power headroom with Supplemental Uplink (SUL).
Background
A communication system can be seen as a facility that enables communication sessions between two or more entities, such as user terminals, base stations, and/or other nodes, by providing carriers between the various entities involved in a communication path. A communication system may be provided, for example, by means of a communication network and one or more compatible communication devices. For example, the communication session may include data communications for carrying communications such as voice, video, electronic mail (email), text messages, multimedia and/or content data. Non-limiting examples of services provided include two-way or multi-way calls, data communication or multimedia services, and access to data network systems, such as the internet.
In a wireless communication system, at least a portion of a communication session between at least two stations occurs over a wireless link. Examples of wireless systems include Public Land Mobile Networks (PLMNs), satellite-based communication systems, and different wireless local networks, e.g., Wireless Local Area Networks (WLANs). Wireless systems can generally be divided into cells and are therefore often referred to as cellular systems.
A user may access the communication system by means of a suitable communication device or terminal. The user's communication device may be referred to as User Equipment (UE) or user equipment. The communication device is provided with suitable signal receiving and transmitting means to enable communication, e.g. to enable access to a communication network or direct communication with other users. A communication device may access a carrier provided by a station (e.g., a base station of a cell) and transmit and/or receive communications on the carrier.
A communication system and associated devices typically operate in accordance with a given standard or specification which sets out what the various entities associated with the system are permitted to do and how that should be achieved. Communication protocols and/or parameters that should be used for the connection are also typically defined. An example of a communication system is UTRAN (3G radio). Other examples of communication systems are the Long Term Evolution (LTE) of the Universal Mobile Telecommunications System (UMTS) radio access technology and the so-called 5G or New Radio (NR) networks. NR is being standardized by the third generation partnership project (3 GPP).
Disclosure of Invention
In a first aspect, there is provided a method comprising: providing, from a user equipment to a network, a first control element comprising power headroom information for a first uplink carrier associated with a cell; determining whether a second carrier associated with a cell exists; and, if present, providing a second control element from the user equipment to the network, the second control element comprising power headroom information for a second uplink carrier, wherein the first control element and the second control element are separate control elements.
The second uplink carrier may be configured for sounding reference signal transmission.
The power headroom information may include a power headroom report.
The second control element may include: the second control element includes an indication of power headroom information for a second uplink carrier.
The indication may comprise one of: the logical channel identification, the reserved bits, or the second control element is relative to the first control element.
The second uplink carrier may be a supplemental uplink carrier.
In a second aspect, there is provided a method comprising: receiving, at a network, a first control element from a user equipment, the first control element comprising power headroom information for a first uplink carrier associated with a cell; and receiving, at the network, a second control element from the user equipment, the second control element comprising power headroom information for the second uplink carrier, if there is a second uplink carrier associated with the cell, wherein the first control element and the second control element are separate control elements.
The second uplink carrier may be configured for sounding reference signal transmission.
The power headroom information may include a power headroom report.
The second control element may include: the second control element includes an indication of power headroom information for a second uplink carrier.
The indication may comprise one of: the logical channel identification, the reserved bits, or the position of the second control element relative to the first control element.
The second uplink carrier may be a supplemental uplink carrier.
In a third aspect, there is provided an apparatus comprising: means for providing a first control element from a user equipment to a network, the first control element comprising power headroom information for a first uplink carrier associated with a cell; means for determining whether a second carrier associated with a cell is present; and means for providing, if present, a second control element from the user equipment to the network, the second control element comprising power headroom information for a second uplink carrier, wherein the first control element and the second control element are separate control elements.
The second uplink carrier may be configured for sounding reference signal transmission.
The power headroom information may include a power headroom report.
The second control element may include: the second control element includes an indication of power headroom information for a second uplink carrier.
The indication may comprise one of: the logical channel identification, the reserved bits, or the position of the second control element relative to the first control element.
The second uplink carrier may be a supplemental uplink carrier.
In a fourth aspect, there is provided an apparatus comprising: means for receiving, at a network, a first control element from a user equipment, the first control element comprising power headroom information for a first uplink carrier associated with a cell; and means for receiving, at the network, a second control element from the user equipment if there is a second uplink carrier associated with the cell, the second control element comprising power headroom information for the second uplink carrier, wherein the first control element and the second control element are separate control elements.
The second uplink carrier may be configured for sounding reference signal transmission.
The power headroom information may include a power headroom report.
The second control element may include: the second control element includes an indication of power headroom information for a second uplink carrier.
The indication may comprise one of: the logical channel identification, the reserved bits, or the position of the second control element relative to the first control element.
The second uplink carrier may be a supplemental uplink carrier.
In a fifth aspect, an apparatus is provided that includes at least one processor and at least one memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to
Providing, from a user equipment to a network, a first control element comprising power headroom information for a first uplink carrier associated with a cell; determining whether a second carrier associated with a cell exists; and, if present, providing a second control element from the user equipment to the network, the second control element comprising power headroom information for a second uplink carrier, wherein the first control element and the second control element are separate control elements.
The second uplink carrier may be configured for sounding reference signal transmission.
The power headroom information may include a power headroom report.
The second control element may include: the second control element includes an indication of power headroom information for a second uplink carrier.
The indication may comprise one of: the logical channel identification, the reserved bits, or the second control element is relative to the first control element.
The second uplink carrier may be a supplemental uplink carrier.
In a sixth aspect, an apparatus is provided that includes at least one processor and at least one memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to: receiving, at a network, a first control element from a user equipment, the first control element comprising power headroom information for a first uplink carrier associated with a cell; and receiving, at the network, a second control element from the user equipment, the second control element comprising power headroom information for the second uplink carrier, if there is a second uplink carrier associated with the cell, wherein the first control element and the second control element are separate control elements.
The second uplink carrier may be configured for sounding reference signal transmission.
The power headroom information may include a power headroom report.
The second control element may include an indication that it includes power headroom information for the second uplink carrier.
The indication may comprise one of: the logical channel identification, the reserved bits, or the position of the second control element relative to the first control element.
The second uplink carrier may be a supplemental uplink carrier.
In a seventh aspect, there is provided a computer program embodied on a non-transitory computer readable storage medium, the computer program comprising program code for controlling a process to perform a process, the process comprising: providing, from a user equipment to a network, a first control element comprising power headroom information for a first uplink carrier associated with a cell; determining whether a second carrier associated with a cell exists; and, if present, providing a second control element from the user equipment to the network, the second control element comprising power headroom information for a second uplink carrier, wherein the first control element and the second control element are separate control elements.
The second uplink carrier may be configured for sounding reference signal transmission.
The power headroom information may include a power headroom report.
The second control element may include: the second control element includes an indication of power headroom information for a second uplink carrier.
The indication may comprise one of: the logical channel identification, the reserved bits, or the position of the second control element relative to the first control element.
The second uplink carrier may be a supplemental uplink carrier.
In an eighth aspect, there is provided a computer program embodied on a non-transitory computer readable storage medium, the computer program comprising program code for controlling a process to perform a process, the process comprising: receiving, at a network, a first control element from a user equipment, the first control element comprising power headroom information for a first uplink carrier associated with a cell; and receiving, at the network, a second control element from the user equipment, the second control element comprising power headroom information for the second uplink carrier, if there is a second uplink carrier associated with the cell, wherein the first control element and the second control element are separate control elements.
The second uplink carrier may be configured for sounding reference signal transmission.
The power headroom information may include a power headroom report.
The second control element may include: the second control element includes an indication of power headroom information for a second uplink carrier.
The indication may comprise one of: the logical channel identification, the reserved bits, or the position of the second control element relative to the first control element.
The second uplink carrier may be a supplemental uplink carrier.
In a ninth aspect, there is provided a computer program product for a computer, the computer program product comprising software code portions for performing the method steps of the first or second aspect when said product is run on a computer.
In the foregoing, a number of different embodiments have been described. It should be appreciated that other embodiments may be provided by a combination of any two or more of the above embodiments.
Drawings
Embodiments will now be described, by way of example only, with reference to the accompanying drawings, in which:
fig. 1 shows a schematic diagram of an example communication system comprising a base station and a plurality of communication devices;
FIG. 2 shows a schematic diagram of an example mobile communication device;
FIG. 3 shows a schematic diagram of an example control apparatus;
FIG. 4 shows a schematic diagram of an example SUL architecture;
fig. 5 shows an example of a medium access control element (MAC CE);
FIG. 6 shows an example of a MAC CE for SUL;
FIG. 7a shows an example of a MAC CE for SUL;
FIG. 7b shows an example of a MAC CE for SUL;
FIG. 7c shows an example of a MAC CE for SUL;
fig. 8 shows a flow diagram of an example method according to an embodiment;
fig. 9 shows a flow diagram of an example method according to an embodiment;
fig. 10 shows an example of a MAC CE according to an embodiment;
fig. 11 shows an example of a MAC CE according to an embodiment.
Detailed Description
Before explaining the examples in detail, certain general principles of wireless communication systems and mobile communication devices are briefly explained with reference to fig. 1 to 3 to help understand the underlying technology of the described examples.
In a wireless communication system 100 such as that shown in fig. 1, mobile communication devices or User Equipment (UE)102, 104, 105 provide wireless access via at least one base station or similar wireless transmission and/or reception node or point. The base stations are typically controlled by at least one suitable controller means to support the operation thereof and to manage the mobile communications devices communicating with the base stations. The controller device may be located in a radio access network (e.g., the wireless communication system 100) or in a Core Network (CN) (not shown), and may be implemented as one central device or its functionality may be distributed over multiple devices. The controller device may be part of the base station and/or provided by a separate entity such as a radio network controller. In fig. 1, the control means 108 and 109 are shown as controlling the respective macro base stations 106 and 107. The control means of the base station may be interconnected with other control entities. The control device is typically provided with memory capacity and at least one data processor. The control means and functions may be distributed between a plurality of control units. In some systems, the control means may additionally or alternatively be provided in the radio network controller.
In fig. 1, base stations 106 and 107 are shown connected to a wider communications network 113 via a gateway 112. Further gateway functionality may be provided to connect to another network.
Smaller base stations 116, 118 and 120 may also be connected to the network 113, for example, through separate gateway functions and/or via controllers of macro-level stations. Base stations 116, 118, and 120 may be pico or femto base stations, and the like. In an example, stations 116 and 118 are connected via gateway 111, while station 120 is connected via controller device 108. In some embodiments, smaller stations may not be provided. The smaller base stations 116, 118, and 120 may be part of a second network (e.g., a WLAN) and may be WLAN APs.
The communication devices 102, 104, 105 may access the communication system based on various access technologies, such as Code Division Multiple Access (CDMA) or wideband CDMA (wcdma). Other non-limiting examples include Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), and various schemes thereof, such as Interleaved Frequency Division Multiple Access (IFDMA), single carrier frequency division multiple access (SC-FDMA), and Orthogonal Frequency Division Multiple Access (OFDMA), Spatial Division Multiple Access (SDMA), and the like.
An example of a wireless communication system is the architecture standardized by the third generation partnership project (3 GPP). The latest 3 GPP-based development is commonly referred to as Long Term Evolution (LTE) of the Universal Mobile Telecommunications System (UMTS) radio access technology. Various stages of development of the 3GPP specifications are referred to as releases. A newer development of LTE is often referred to as LTE-advanced (LTE-a). LTE employs a mobile architecture known as evolved universal terrestrial radio access network (E-UTRAN). The base stations of such systems are referred to as evolved or enhanced node bs (enbs) and provide E-UTRAN features to the communication devices, such as user plane packet data convergence/radio link control/medium access control/physical layer protocol (PDCP/RLC/MAC/PHY) and control plane Radio Resource Control (RRC) protocol termination. Other examples of radio access systems include those provided by base stations of systems based on technologies such as Wireless Local Area Network (WLAN) and/or WiMax (worldwide interoperability for microwave access). A base station may provide coverage for an entire cell or similar radio service area.
Examples of suitable communication systems are the 5G or NR concepts. The network architecture in NR may be similar to that of LTE-advanced. The base station of the NR system may be referred to as a next generation node b (gnb). The network architecture may vary depending on the need to support various radio technologies and better QoS support, as well as some on-demand requirements for QoS levels, e.g., to support QoE from a user perspective. Moreover, network-aware services and applications and service-and application-aware networks may introduce changes to the architecture. These are related to Information Centric Networking (ICN) and user centric content delivery networking (UC-CDN) approaches. NR may use multiple-input multiple-output (MIMO) antennas, more base stations or nodes than LTE (the so-called small cell concept), include macro stations operating in cooperation with smaller stations, and may employ various radio technologies for better coverage and higher data rates.
Future networks may use Network Function Virtualization (NFV), which is a network architecture concept that proposes virtualizing network node functions as "building blocks" or entities that may be operably connected or linked together to provide services. A Virtualized Network Function (VNF) may comprise one or more virtual machines running computer program code using standard or general-purpose types of servers rather than custom hardware. Cloud computing or data storage may also be used. In radio communication, this may mean that the node operations are performed at least partly in a server, host or node operatively coupled to the remote radio head. It is also possible that node operations will be distributed among multiple servers, nodes or hosts. It should also be understood that the labor allocation between core network operation and base station operation may be different than LTE or even non-existent.
A possible mobile communication device will now be described in more detail with reference to fig. 2, which shows a schematic partial cross-sectional view of a communication device 200. Such communication devices are often referred to as User Equipment (UE) or terminals. Suitable mobile communication devices may be provided by any device capable of sending and receiving radio signals. Non-limiting examples include a Mobile Station (MS) or a mobile device such as a mobile phone or a so-called 'smart phone', a computer provided with a wireless interface card or other wireless interface facility (e.g., a USB dongle), a Personal Digital Assistant (PDA) or tablet computer provided with wireless communication capabilities, or any combination of these, etc. For example, mobile communication devices may provide data communication for carrying communications such as voice, electronic mail (email), text messages, multimedia and so on. Many services can be offered and provided to the user via their communication device. Non-limiting examples of such services include two-way or multi-way calls, data communications or multimedia services, or simply access to a data communications network system, such as the internet. Broadcast or multicast data may also be provided to the user. Non-limiting examples of content include downloads, television and radio programs, videos, advertisements, various alerts, and other information.
The mobile device is typically provided with at least one data processing entity 201, at least one memory 202 and possibly other components 203 for software and hardware assistance in performing tasks designed to be performed, including controlling access to and communication with access systems and other communication devices. Data processing, storage and other related control means may be provided on an appropriate circuit board and/or in a chipset. This feature is denoted by reference numeral 204. The user may control the operation of the mobile device by means of a suitable user interface, such as a keypad 205, voice commands, touch sensitive screen or pad, combinations thereof or the like. A display 208, a speaker, and a microphone may also be provided. Furthermore, the mobile communication device may comprise suitable connectors (wired or wireless) to other devices and/or for connecting external accessories (e.g. hands-free devices) to it.
The mobile device 200 may receive signals over the air interface or radio interface 207 via appropriate means for receiving and may transmit signals via appropriate means for transmitting radio signals. In fig. 2, a transceiver device is schematically designated by block 206. For example, the transceiver device 206 may be provided by means of a radio and an associated antenna arrangement. The antenna arrangement may be arranged inside or outside the mobile device.
Fig. 3 shows an example of a control arrangement for a communication system, e.g. a station coupled to and/or for controlling an access system such as a RAN node, e.g. a base station, eNB or gNB or a node or server or host of a core network such as an MME or S-GW. The method may be implanted in a single control device or on more than one control device. The control means may be integrated with or external to the nodes or modules of the core network or RAN. In some embodiments, the base station comprises a separate control device unit or module. In other embodiments, the control device may be another network element, such as a radio network controller or a spectrum controller. In some embodiments, each base station may have such control means as well as control means provided in the radio network controller. The control means 300 may be arranged to provide control of communication in the service area of the system. The control device 300 comprises at least one memory 301, at least one data processing unit 302, 303 and an input/output interface 304. Via the interface, the control device may be coupled to a receiver and a transmitter of the base station. The receiver and/or transmitter may be implemented as a radio front end or a remote radio head.
To improve Uplink (UL) coverage in high frequency scenarios, a Supplemental Uplink (SUL) may be configured. The SUL is modeled as another UL carrier for the same cell (i.e., there is only one DL carrier associated with the cell).
Fig. 4 shows a schematic representation of a SUL, where the UE 200 is configured with two UL carriers for one DL of the same cell 410.
Any one of the primary UL carriers may be used for UL transmission. In addition to this is a Sounding Reference Signal (SRS), which may be transmitted simultaneously in one carrier (UL carrier or SUL carrier) while data is being transmitted on the other carrier. Uplink transmissions on both ULs in the SUL are controlled by the network (e.g., through L1 signaling) to avoid overlapping Physical Uplink Shared Channel (PUSCH)/Physical Uplink Control Channel (PUCCH) transmissions in time. Overlapping transmissions on PUSCH may be avoided by scheduling, while overlapping transmissions on PUCCH may be avoided by configuration (i.e., PUCCH may be configured for only one of the two ULs of a cell). In addition, initial access is supported in each of the two ULs.
In SUL, the default position of PUSCH is the same as the carrier used by PUCCH. UE-specific RRC signaling may be used to (re) configure the location of the PUCCH on the SUL carrier or on the non-SUL UL carrier in the SUL band combination.
SRS may be configured on SUL and non-SUL UL carriers regardless of carrier configurations for PUSCH and PUCCH. In SUL band combining, RRC parameters related to SRS may be configured independently for SRS on SUL carriers and SRS on non-SUL UL carriers. The RRC configuration may include PUSCH, SRS, and power control information for each UL carrier and a dedicated PUCCH for a single UL carrier.
That is, SRS transmission may occur independently of a carrier (UL or SUL) configuration transmitting PUSCH and PUCCH, and thus may occur simultaneously.
The Power Headroom (PH) indicates how much transmission power the UE has to use in addition to the power being used for the current transmission. It has been agreed that the PH for SRS transmission can be reported to assist the scheduler operation. SRS PH reporting for the uplink without configured PUSCH (referred to as type 3PH reporting) may be supported. The SRS virtual PHR report may be based on one SRS resource configured by the NW.
A Power Headroom Report (PHR) may be included in the MAC CE. Type 1PH is used for PUSCH transmission, and type 3PH is used for SRS transmission (type 2 is used for PUSCH and PUCCH transmission). The margin is reported based on actual transmission or virtual transmission (when no actual transmission occurs during the transmission of the reporting PHR, the margin is calculated based on the reference format).
Fig. 5 shows an example PHR MAC Control Element (CE) reporting type 1 and type 2PH with the highest scelllindex of Scell, where the configured uplink is less than 8. PHR MAC CE may be defined as follows:
Ci: this field indicates the presence of the PH field of the secondary cell (Scell) with scelllindex i. C set to "1iThe field indicates the PH field reported for Scell with scelllindex i. C set to "0iThe field indicates that the PH field for the Scell with scelllindex i is not reported. The PH for the primary cell (Pcell) always exists, without bits in the bitmap;
r: reserved bits set to "0";
v: this field indicates whether the PH value is based on the actual transmission or the reference format. For type 1PH, V-0 indicates actual transmission on PUSCH and V-1 indicates using PUSCH reference format. For type 2PH, V-0 indicates actual transmission on PUCCH, and V-1 indicates the use of PUCCH reference format. For type 3PH, V-0 indicates actual transmission on SRS and V-1 indicates the use of SRS reference format. Further, for type 1, type 2, and type 3PH, V ═ 0 indicates that there is an inclusion of an associated PCMAX,cOctet of the field, and V ═ 1 indicates that P containing the association is omittedCMAX,cOctets of the field;
power Headroom (PH): this field indicates a power headroom level. The length of this field is 6 bits.
P: this field indicates whether the MAC entity applies power backoff due to power management. If no power roll-back due to power management is applied, the MAC entity should set: if corresponding PCMAX,cThe fields will have different values, P ═ 1;
PCMAX,c: if it exists, this fieldIndicating P used to calculate previous PH fieldCMAX,cOr
Figure BDA0002699700290000121
For the SUL case, a separate PH reporting (PHR) format may be needed because SRS transmission may be sent in the SUL/UL carrier while another carrier transmits PUSCH. Currently, type 1 and type 3 Power Headroom (PH) may not be reported simultaneously for the same cell. The ability to report both type 1PH and type 3PH in the same cell would be desirable.
Several options have been proposed.
In case UL and SUL can be configured with PUSCH, a new PHR MAC CE format has been proposed. Fig. 6 shows an example PHR MAC CE format for supporting per UL carrier PH reporting.
Since the NW may know whether the SUL carrier is configured for the Scell of the UE, a bitmap indication for the presence of the PH for a specific UL carrier may not be needed. UL carriers for a particular cell are stacked based on a pre-specified ordering, e.g., SUL first, then non-SUL, etc., similar to type 2 PH. That is, in this option, PHs for two UL carriers of the same Scell are stacked according to UL carrier indexes known by the network.
However, in this proposal, the PHR format is created for the purpose of simultaneously enabling type 1 and/or type 3 PHs of the SUL. The PHR format may have dual-PH overhead for a single cell when the SUL is configured, or there may be ambiguity in the NW when dual-PH is reported during RRC reconfiguration (e.g., depending on whether SRS is configured to report on UL/SUL when other carriers are used).
In an alternative proposal, P is because the SUL carriers and non-SUL carriers share the same cell index (due to the fact that they belong to the same serving cell)CMAX,cMay be used to indicate whether one or more type 1PHR are to be followed for the same serving cell. The order of the carriers may be fixed in the specification.
An example type 1PHR format for Pcell is shown in fig. 7a, and an example type 1 format for PSCell is shown in fig. 7 b. The indicator field "E" is used to indicate that the same serving cell has yet another type 1 PHR.
The same approach may be applicable to the phr mac CE design when one UL is configured with PUSCH and the other UL is configured with SRS. An indication field may be added to indicate the presence of type 1 or 3 PH. Fig. 7c shows an example MAC CE based on this approach. The indicator bit is 1 indicating that there is a corresponding PH for the cell.
In this case, additional PHR formats may be defined to carry type 1PH and type 3PH for the same cell. When PHR is triggered, type 1PH always exists in the MAC CE, but whether type 3PH exists depends on whether SRS transmission is configured on a different carrier. An indicator field may be added to indicate the presence of type 3 PH. To save these bits, R bits may be used. A length field L may be added in the MAC subheader to indicate the length of the MAC CE.
In the example described with reference to fig. 7a to 7c, the type 1PH is placed first and always exists; type x PH (x ═ 1 or 3) follows type 1PH and may not always be present. P may be in type 1PHcmaxAn indicator field (e.g., "R1" or "E") is added to the byte to indicate the presence of type x PH (x ═ 1 or 3).
However, in the method described with reference to fig. 7a to 7c, the PHR format is created for the purpose of implementing SUL while enabling type 3 PH. Since the indicator field is always needed, the optimization currently in the MAC specification cannot be used whether or not a further PHR for the same cell is reported, wherein the inclusion of P can be omitted if a virtual PH is reportedcmaxOf the memory cell. That is, this option may increase overhead.
Another approach for PHR MAC CE design may be to reuse the DC's current PHR format (multi-entry PHR MAC CE). For the SUL carrier, a separate scelllindex may be configured. There may not be enough Scell indices to cover all combinations. Since the SUL and UL carriers are from the same cell, different cell indices may not be appropriate since the PHR formatted bitmap will also need to be extended.
Fig. 8 illustrates a flow diagram of an example method that may allow simultaneous type 1 and type 3PH reporting for a single serving cell.
In a first step S1, the method comprises providing, from a user equipment to a network, a first control element comprising power headroom information for a first uplink carrier associated with a cell.
In a second step S2, the method includes determining whether there is a second carrier associated with the cell. This step may additionally include determining whether the second uplink carrier is configured with SRS resources.
In a third step S3, if present, the method comprises providing a second control element from the user equipment to the network, the second control element comprising power headroom information for a second uplink carrier, wherein the first control element and the second control element are separate control elements. The first and second control elements may be MAC CEs. The individual MAC CEs may be included in the same MAC PDU.
Fig. 9 illustrates a flow diagram of an example method that may allow simultaneous type 1 and type 3PH reporting for a single serving cell.
In a first step T1, the method includes receiving, at a network, a first control element from a user equipment, the first control element comprising power headroom information for a first uplink carrier associated with a cell.
In a second step T2, the method comprises receiving, at the network, a second control element from the user equipment, the second control element comprising power headroom information for a second uplink carrier, if there is a second uplink carrier associated with the cell, wherein the first control element and the second control element are separate control elements. The first and second control elements may be MAC CEs. The individual MAC CEs may be included in the same MAC PDU.
The method described with reference to fig. 8 may be performed at a user equipment. The method described with reference to fig. 9 may be performed at a node of a network, e.g., an eNB, a gNB, or a cloud RAN.
The second uplink carrier may be a SUL carrier. The second uplink carrier may be configured for SRS.
The methods described with reference to fig. 8 and 9 provide separate MAC CEs for type 1 (including "generic PHR" of all cells, i.e., no PH of type 3PH for cells configured with SUL) and type 3PH (reporting serving cells only as needed). The same MAC CE format may be applied to both.
Individual MAC CEs with the same format can be defined for the SUL of all cells without affecting the original MAC CE without SUL. The individual MAC CEs may contain a SUL carrier of type 1PH or type 3PH (depending on whether PUSCH or SRS is configured on the SUL carrier) and/or actual or virtual values (depending on whether there is actual PUSCH/SRS transmission when reporting PHR). If PUSCH or SRS is not configured on the UL carrier of the serving cell, the MAC CE without SUL does not report type 1 for PUSCH or type 3 for SRS.
If the uplink carrier (UL or SUL) is configured with SRS reporting and the carrier is not the current "active" carrier, i.e. no PUSCH/PUCCH transmission is done, the UE reports type 3PH for a given serving cell (due to the active carrier, the NW may determine PH based on type 1 reporting of PUSCH).
The second control element may include: the second control element includes an indication of power headroom information for a second uplink carrier. The indication may comprise one of: the logical channel identification, the reserved bits, or the position of the second control element relative to the first control element.
For example, the NW may determine whether the MAC Ce is for a generic PHR or only type 3PH, or alternatively for a PHR of the SUL, based on the indicated individual LCID value, the reserved bits in the cell index space of the PHR format, or the order in which the MAC CEs are multiplexed within the MAC PDU. For example, if any active serving cell is configured with a SUL, the generic PHR may always be multiplexed first and the second PH MAC CE will follow.
The PHR MAC CE for the SUL may be indicated with a separate LCID and bitmap only when needed by the cell configured with the SUL.
The presence of Pcell type 3PH reports may also be explicitly indicated based on the R bit for the cell index.
The generic PHR format may also be applied to type 3PH reports. Fig. 10 illustrates a multi-entry PHR MAC CE format for up to seven scells reporting type 3 PH. The format is based on the MAC CE format described with reference to fig. 5.
Using a separate MAC CE for the SUL means that type 3PH is only reported when needed. If a virtual PH (for generic PHR and type 3-specific PHR) is reported, P may always be omittedcmaxField since no further PHR indication is required. This may mitigate the overhead introduced.
The same Scell index may be used to indicate UL and SUL of the same cell (considering that the report is separate).
No ambiguity may be introduced in the NW when for which serving cell the UE is to report type 1 and type 3 simultaneously.
Fig. 11 shows an example of a multi-entry PHR MAC CE with highest scelllindex of Scell, where the configured uplink is less than 8 for type 1/3PH reporting with SUL. The MAC CE in fig. 11 is an example of a PHR format, where the PH of the SUL is in a separate MAC CE, including type 1PH and type 3PH of the SUL, depending on whether a PUSCH or SRS is configured on the SUL (x ═ 1 or 3). The PHR of the non-SUL carrier may be included in a separate PHR MAC CE in the same MAC PDU. When the type 1PH of the SUL for the serving cell is included in the PHR MAC CE, it is not required to be included for another MAC CE. Alternatively, the virtual PH may be reported for another MAC CE. When actual PUSCH transmissions are not scheduled on both UL and SUL carriers, it may be specified that virtual type 1 is reported only for the UL carrier.
The PHR MAC CE format may include bit maps for scellllndication of different sizes (e.g., 0, 8, or 32). The bitmap may have different sizes for the first PHR MAC CE and the second PHR MAC CE.
Individual PHR MAC CEs in the same MAC PDU may also be applicable to other use cases, e.g., when multiple PHs of the same type are to be reported for the same cell, to sTTI (shorter transmission time interval), even if they are on the same carrier. In this aspect, an example method may include: providing a first control element from the user equipment to the network, the first control element comprising power headroom information for a first TT1 of the carrier; determining whether a second TTI on the carrier requires a different PH type than the first TT 1; and, if so, providing a second control element from the user equipment to the network, the second control element comprising power headroom information for a second TTI, wherein the first control element and the second control element are separate control elements.
The method may be implemented in the user equipment described with reference to fig. 2 or in the control apparatus described with reference to fig. 3. The control functions may include: providing, from a user equipment to a network, a first control element comprising power headroom information for a first uplink carrier associated with a cell; determining whether a second carrier associated with a cell exists; and, if present, providing a second control element from the user equipment to the network, the second control element comprising power headroom information for a second uplink carrier, wherein the first control element and the second control element are separate control elements.
Alternatively or additionally, the control functions may include: receiving, at a network, a first control element from a user equipment, the first control element comprising power headroom information for a first uplink carrier associated with a cell; and receiving, at the network, a second control element from the user equipment, the second control element comprising power headroom information for the second uplink carrier, if there is a second uplink carrier associated with the cell, wherein the first control element and the second control element are separate control elements.
It should be understood that the apparatus may comprise or be coupled to other units or modules or the like, such as a radio part or radio head, for use in or for transmission and/or reception. Although the apparatus has been described as one entity, the different modules and memories may be implemented in one or more physical or logical entities.
Note that although embodiments have been described with respect to SUL in NR, similar principles may be applied with respect to other networks and communication systems where the serving cell has more than one uplink carrier or more than one type of PH to be reported for the serving cell. Thus, although certain embodiments are described above by way of example with reference to certain example architectures for wireless networks, technologies and standards, embodiments may be applied to any other suitable form of communication system than that illustrated and described herein.
It is also noted herein that while the above describes exemplifying embodiments, there are several variations and modifications which may be made to the disclosed solution without departing from the scope of the present invention.
In general, the various embodiments may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects of the invention may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device, although the invention is not limited thereto. While various aspects of the invention may be illustrated and described as block diagrams, flow charts, or using some other pictorial representation, it is well understood that these blocks, apparatus, systems, techniques or methods described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
Embodiments of the invention may be implemented by computer software executable by a data processor of a mobile device, such as in a processor entity, or by hardware, or by a combination of software and hardware. Computer software or programs (also referred to as program code, including software routines, applets, and/or macros) can be stored in any device-readable data storage medium, and they include program instructions to perform particular tasks. The computer program product may comprise one or more computer-executable components which, when the program is run, are configured to perform an embodiment. The one or more computer-executable components may be at least one software code or portion thereof.
Further in this regard it should be noted that any block of the logic flow as in the figures may represent a program step or an interconnected logic circuit, block or function or a combination of a program step and a logic circuit, block or function. The software may be stored on such physical media as memory chips or memory blocks implemented within the processor, magnetic storage such as hard or floppy disks, and optical storage such as, for example, DVDs and their data variants CDs. The physical medium is a non-transitory medium.
The memory may be of any type suitable to the local technical environment and may be implemented using any suitable data storage technology, such as semiconductor-based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory. The data processor may be of any type suitable to the local technical environment, and may include one or more of general purpose computers, special purpose computers, microprocessors, Data Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), FPGAs, gate level circuits and processors based on a multi-core processor architecture, as non-limiting examples.
Embodiments of the invention may be practiced in various components such as integrated circuit modules. The design of integrated circuits is by and large a highly automated process. Complex and powerful software tools are available for converting a logic level design into a semiconductor circuit design ready to be etched and formed on a semiconductor substrate.
The foregoing description provides by way of non-limiting example a full and informative description of the exemplary embodiments of this invention. However, various modifications and adaptations may become apparent to those skilled in the relevant arts in view of the foregoing description, when read in conjunction with the accompanying drawings and the appended claims. However, all such and similar modifications of the teachings of this invention will still fall within the scope of this invention, as defined in the appended claims. Indeed, there is yet another embodiment that includes a combination of one or more embodiments with any other embodiments previously discussed.

Claims (16)

1. A method, comprising:
providing, from a user equipment, a first control element to a network, the first control element comprising power headroom information for a first uplink carrier associated with a cell;
determining whether a second carrier associated with the cell exists; and, if present,
providing a second control element from the user equipment to the network, the second control element comprising power headroom information for the second uplink carrier, wherein the first control element and the second control element are separate control elements.
2. The method of claim 2, wherein the second uplink carrier is configured for sounding reference signal transmission.
3. The method of claim 1 or claim 2, wherein the power headroom information comprises a power headroom report.
4. The method of any of claims 1-3, wherein the second control element comprises: the second control element includes an indication of power headroom information for the second uplink carrier.
5. The method of claim 4, wherein the indication comprises one of: a logical channel identification, reserved bits, or the position of the second control element relative to the first control element.
6. The method according to any of claims 1 to 5, wherein the second uplink carrier is a supplemental uplink carrier.
7. A method, the method comprising:
receiving, at a network, a first control element from a user equipment, the first control element comprising power headroom information for a first uplink carrier associated with a cell; and
receiving, at the network, a second control element from the user equipment if there is a second uplink carrier associated with the cell, the second control element comprising power headroom information for the second uplink carrier, wherein the first control element and the second control element are separate control elements.
8. The method of claim 7, wherein the second uplink carrier is configured for sounding reference signal transmission.
9. The method of claim 7 or claim 8, wherein the power headroom information comprises a power headroom report.
10. The method of any of claims 7 to 9, wherein the second control element comprises: the second control element includes an indication of power headroom information for the second uplink carrier.
11. The method of claim 10, wherein the indication comprises at least one of: a logical channel identification, reserved bits, or the position of the second control element relative to the first control element.
12. The method according to any of claims 7 to 11, wherein the second uplink carrier is a supplemental uplink carrier.
13. An apparatus comprising means for performing the method of any of claims 1-6 or 7-12.
14. A computer program product for a computer, the computer program product comprising software code portions for performing the steps of any one of claims 1 to 6 or 7 to 12 when the product is run on the computer.
15. An apparatus, comprising:
at least one processor and at least one memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to:
providing, from a user equipment, a first control element to a network, the first control element comprising power headroom information for a first uplink carrier associated with a cell;
determining whether a second carrier associated with the cell exists; and, if present,
providing a second control element from the user equipment to the network, the second control element comprising power headroom information for the second uplink carrier, wherein the first control element and the second control element are separate control elements.
16. An apparatus, comprising:
at least one processor and at least one memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to:
receiving, at a network, a first control element from a user equipment, the first control element comprising power headroom information for a first uplink carrier associated with a cell;
and receiving, at the network, a second control element from the user equipment if there is a second uplink carrier associated with the cell, the second control element comprising power headroom information for the second uplink carrier, wherein the first control element and the second control element are separate control elements.
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