WO2017113979A1 - Dispositifs de système de communications cellulaires - Google Patents

Dispositifs de système de communications cellulaires Download PDF

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Publication number
WO2017113979A1
WO2017113979A1 PCT/CN2016/104183 CN2016104183W WO2017113979A1 WO 2017113979 A1 WO2017113979 A1 WO 2017113979A1 CN 2016104183 W CN2016104183 W CN 2016104183W WO 2017113979 A1 WO2017113979 A1 WO 2017113979A1
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WIPO (PCT)
Prior art keywords
wireless communication
resources
communication system
cellular communication
scheduling request
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Ceased
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PCT/CN2016/104183
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English (en)
Inventor
Ron Toledano
Efstathios KATRANARAS
Benny Assouline
Roy Ron
Guillaume Vivier
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JRD Communication Shenzhen Ltd
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JRD Communication Shenzhen Ltd
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Priority to CN201680071478.0A priority Critical patent/CN108432279B/zh
Publication of WO2017113979A1 publication Critical patent/WO2017113979A1/fr
Anticipated expiration legal-status Critical
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    • 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
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • 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
    • H04L5/0058—Allocation criteria
    • H04L5/0064—Rate requirement of the data, e.g. scalable bandwidth, data priority

Definitions

  • Embodiments of the present invention generally relate to cellular communications systems and in particular to devices and methods for determining a Scheduling Request opportunity configuration.
  • a wireless communication system typically comprises a plurality of radio network subsystems, each radio network subsystem comprising one or more cells to which UEs may attach, and thereby connect to the network.
  • Each macro-cellular RNS further comprises a controller, in a form of a Radio Network Controller (RNC) , operably coupled to the one or more Node Bs.
  • RNC Radio Network Controller
  • Communications systems and networks have developed towards a broadband and mobile system.
  • the 3rd Generation Partnership Project has developed a Long Term Evolution (LTE) solution, namely, an Evolved Universal Mobile Telecommunication System Territorial Radio Access Network, (E-UTRAN) , for a mobile access network, and a System Architecture Evolution (SAE) solution, namely, an Evolved Packet Core (EPC) , for a mobile core network.
  • LTE Long Term Evolution
  • E-UTRAN Evolved Universal Mobile Telecommunication System Territorial Radio Access Network
  • SAE System Architecture Evolution
  • EPC Evolved Packet Core
  • a macrocell in an LTE system is supported by a base station known as an eNodeB or eNB (evolved Node B) .
  • SR Scheduling Request
  • PUCCH Physical Uplink Control Channel
  • Scheduling Request periodicity is typically10ms so on average, a UE will have 5 ms to wait for a PUCCH to become available.
  • the time taken for the Scheduling Request sent on the PUCCH to reach the eNB is 1 ms.
  • the Scheduling Request is decoded and the Scheduling Grant is generated. These decoding and generating steps can take of the order of 3 ms.
  • Transmission of the Scheduling Grant from the eNB to the UE can take a further 1ms whereupon there is a further processing delay in the UE of typically 3 ms while the UE decodes the Scheduling Grant and encodes the uplink data.
  • Transmission of the uplink data can take a further 1ms and decoding of the received data in the eNB can take a further 3 ms.Therefore, the total delay (or latency) associated with an uplink data transmission can total 17 ms.
  • a 1ms periodicity if configured, could reduce the average waiting time for a PUCCH resource to 0.5ms for subframe alignment and thereby reduce the total average delay.
  • Such configuration is regarded as inefficient from a resource utilisation point of view.
  • a method for determining a Scheduling Request configuration for a wireless communication device located within an area of coverage of a cellular communication system comprising one or more cells, the method including: monitoring an uplink scheduling load attributable to one or more wireless communication devices located within the cellular communication system, identifying spare resources on an uplink channel within the cellular communication system, allocating at least a portion of the identified spare resources for additional Scheduling Request opportunities for the wireless communication devices, and transmitting information relating to the identified spare resources to one or more wireless communication devices located within the cellular communication system.
  • a processing circuit for use in a network element which supports at least one cell in a cellular communication system, the processing circuit being adapted to monitor an uplink scheduling load attributable to one or more wireless communication devices located within an area of coverage of the cellular communication system; identify spare resources on an uplink channel within the cellular communication system; allocate at least a portion of the identified spare resources for additional Scheduling Request opportunities for the wireless communication devices; and determine a Scheduling Request configuration including information relating to the identified spare resources for transmission to one or more wireless communication devices located within the cellular communication system.
  • a wireless communication device for use in a cellular communication system, wherein the wireless communication device is arranged to; establish a connection with a network element of the cellular communication system; receive an allocation of periodically-available resource for a Scheduling Request; receive an allocation of additional resources for a Scheduling Request opportunity; and if no periodically-available resource is currently available, transmit a Scheduling Request using an additional allocated resource.
  • the processing circuit is incorporated within a network element of the cellular communications system, such as an evolved Node B, for example.
  • a network element of the cellular communications system such as an evolved Node B, for example.
  • the functionality of the processing circuit may be distributed between several network elements.
  • the cellular communication system may be an LTE system.
  • the wireless communication device may be a User Equipment or similar mobile communications device.
  • the processing circuit may be implemented in one or more integrated circuits.
  • the additional Scheduling Request opportunities may be signalled to a wireless communication device in a number of ways which will be described below.
  • a non-transitory computer readable medium having computer readable instructions stored thereon for execution by a processor to perform the method according to the first aspect.
  • the non-transitory computer readable medium may comprise at least one from a group consisting of: a hard disk, a CD-ROM, an optical storage device, a magnetic storage device, a Read Only Memory, a Programmable Read Only Memory, an Erasable Programmable Read Only Memory, EPROM, an Electrically Erasable Programmable Read Only Memory and a Flash memory.
  • Embodiments of the invention introduce a physical layer enhancement in addition to accompanying L2/3 signalling to allow for a User Equipment, when in connected mode, to send a Scheduling Request to an eNB with less delay on average than is currently the case.
  • the eNB is provided with the ability to dynamically signal (to a UE) additional and more frequent Scheduling Request opportunities. In this way, the latency for transmission of a first uplink path packet from a UE to the eNB is reduced, on average.
  • the invention is particularly applicable to UEs which are operating in a connected mode and which are already semi-statically configured with periodic Scheduling Request opportunities.
  • PUCCH resources are dynamically allocated for additional Scheduling Request opportunities to wireless communication devices.
  • the identified spare resources may be allocated to all wireless communication devices in a cell or to a subset of those wireless communication devices. Such a choice may be made based on a priority-based distribution of resources or on a fair and even distribution of resources, for example.
  • the invention advantageously reduces latency for a first uplink packet in a burst. Improving this parameter can have a significant effect on the TCP/IP (Transmission Control Protocol/Internet Protocol) slow start phase and therefore the overall throughput. Use of the invention can also induce a significant improvement for delay-sensitive applications. Furthermore, the invention can permit additional flexibility for a network scheduler. UEs may be configured with a lower SR opportunity periodicity but be allocated with more SR opportunities dynamically. This can result in a lower average latency while at the same time freeing up more resources while in high load situations. This benefit can be gained by dynamically scaling up or down the PUCCH/PUSCH (Physical Uplink Shared Channel) allocation.
  • PUCCH/PUSCH Physical Uplink Shared Channel
  • the network is forced to compromise either on latency or throughput.
  • These advantages come with a very low penalty to uplink capacity.
  • the network may decide according to the immediate load whether to allocate additional SR opportunities or not. The benefits are most noticeable in low and medium load situations and the network may scale down the number of additional SR opportunities in high load situations.
  • FIG. 1 is a simplified block diagram of a part of a cellular communication system and operating in accordance with an example embodiment.
  • FIG. 2 is a simplified flowchart illustrating a first example of a method for determining and signalling a Scheduling Request configuration.
  • FIG. 3 is a simplified flowchart illustrating a second example of a method for determining and signalling a Scheduling Request configuration.
  • an example of part of a wireless communication system operating in accordance with embodiments of the invention is illustrated and indicated generally at 100 and comprises an evolved Node B (eNB) 101 supporting an LTE cell 102.
  • the eNB 101 may support a multiplicity of cells.
  • the evolved Node B 101 comprises a part of a radio access network which in this example is an E-UTRAN.
  • User Equipments 103a, 103b, 103c are located within the area of coverage of the cell 102. Just three User Equipments are shown in FIG. 1 but more or fewer User Equipments may be located in the cell 102 and be in a connected mode at any given time.
  • EPC evolved packet core
  • the 1 includes a Packet Gateway P-GW 104 and a Serving GPRS (General Packet Radio System) Support Node (SGSN) 105.
  • the P-GW 104 is responsible for interfacing the radio access network with a packet data network, eg. a Packet Switched Data Network (PSDN) (such as the Internet) .
  • PSDN Packet Switched Data Network
  • the SSGN 105 performs a routing and tunnelling function for traffic to and from the cell 102, while the P-GW 104 links with external packet networks.
  • the EPC also comprises a Mobility Management Entity 106.
  • the eNB 101 is linked to the SSGN 105 through the Mobility Management Entity (MME) 106.
  • MME Mobility Management Entity
  • the eNB 101 is also connected with the P-GW 104 through the MME 106 and a Service Gateway S-GW 107.
  • the MME 106 handles signalling control and mobility while the S-GW 107 is a local anchor point for user data.
  • the eNB 101 is provided with a processing circuit 108 whose function will be described below.
  • the eNB also comprises a receiver (Rx) 109 and a transmitter (Tx) 110.
  • the processing circuit 108 monitors the uplink scheduling load within the cell 102 and identifies currently unused (and therefore spare) resources on the uplink channel. The processing circuit 108 then allocates at least a portion of the identified spare resources for additional Scheduling Request opportunities for one or more of the UEs 103a, 103b, and 103c which are currently in connected mode in the cell 102. The processing circuit 108 then determines a Scheduling Request configuration which includes information relating to the identified spare resources. The determined configuration is then transmitted by the transmitter 110 to one or more of the UEs 103a, 103b, 103c. The information contained in the Scheduling Request configuration tells a UE which PUCCH resources have been allocated for Scheduling Requests.
  • the PUCCH is located at the extreme ends (or edges) of the system bandwidth in the frequency domain.
  • the PUCCH resource consists of one resource block at one edge of the system bandwidth which is followed by another resource block in the following slot (at the opposite edge of the channel spectrum) .
  • a Resource Block is a unit of transmission resource consisting of 12 subcarriers in the frequency domain and one timeslot (0.5ms) in the time domain) .
  • PUCCH resources are allocated equally in both system bandwidth edges.
  • a sequential method of PUCCH resource allocation is performed which follows the same principle.
  • the processing circuit 108 monitors the current uplink scheduling load and determines whether or not spare resources for scheduling requests are available. Additional PUCCH resources which have been identified by the processing circuit are allocated sequentially from both edges, inwards and towards the centre of the system bandwidth.
  • an opportunistic method of PUCCH resource allocation is performed.
  • This method of resource allocation is suitable for use with formats 1 (including 1a and 1b) , 2 (including 2a and 2b) and 3.
  • formats 2 and 3 preconfigured resources for the PUCCH are allocated in a semi-static manner. However, not all of these resources are used (by a UE) in each and every subframe. This leads to fragmentation creating “holes” which can be used.
  • the processing circuit 108 can allocate these unused (additional) resources to one or more UEs 103a, 103b, 103c in the cell 102.
  • the code, time and frequency of the additional resources are known to the relevant UEs by way of semi-static configuration or additional signalling.
  • the signalling of the additional PUCCH resource allocation (from the eNB 101 to a UE 103a, 103b, 103c) can be performed using one of several methods.
  • PUCCH resource is multiplexed with several SR transmissions from different UEs.
  • the number of UEs multiplexed per PUCCH resource ‘n’ is semi-statically configured in the cell and broadcast as part of the SI (System Information) .
  • the connected UEs are divided into groups of size equal to the multiplexing level ‘n’ (or a multiple of ‘n’ ) in the cell and signalled together for a dynamic additional SR opportunity.
  • a semi static configuration is used consisting of association with a group and the PUCCH resource to be used within the group.
  • a UE can be configured with a PUCCH resource index i.
  • the group index would then be (floor of i/n) and the PUCCH resource within the group would be (i mod n) .
  • the PHICH Physical Hybrid ARQ (Activation Repeat Request) Channel
  • the processing circuit 108 in the eNB 102 semi-statically allocates additional PHICH REGs (Resource Element Groups) .
  • a PHICH orthogonal sequence index code may be associated, by means of dedicated semi-static signalling, with a group of n UEs (n being the PUCCH multiplexing level referred to above) .
  • the following table shows a possible PHICH REGs configuration. The number of REGs is determined by the system bandwidth and the so-called broadcast parameter ‘Ng’ which is signalled in the MIB (Master Information Block) .
  • the processing circuit 108 in the eNB 102 allocates a PUCCH resource for a group of UEs for additional SR opportunity, the associated PHICH orthogonal sequence in the associated PHICH REG is transmitted.
  • a UE 103a, 103b, 103c is semi-statically configured with a frequency and/or code for SR transmission, that is; the UE is configured with the resource index i as described above.
  • a UE whose PUCCH group is signalled via PHICH for additional SR opportunities can transmit SR on the Nth subframe following the subframe in which the PHICH was received, (N being an integer known to all system elements in advance and which accounts for the time required by the UE for decoding and processing) .
  • N can be 1 or 2 or have a maximum value of 4, for example, while the frequency and code for SR transmission are determined as the same frequency and code which are configured for the periodic SR opportunity.
  • the flow chart of FIG. 2 illustrates an example of how a UE 102a handles the PHICH/PUCCH signalling method described above for a discrete transmission time interval (TTI) .
  • TTI discrete transmission time interval
  • the process starts at 201 with the start of a new TTI.
  • the UE determines whether or not it has any data to transmit to the eNB (that is; if data is received, for transmission, from higher layers) . If there is no data to transmit then the process ends at 203. If on the other hand, there is data to be transmitted, then the process proceeds to 204 where the UE determines whether it can use a (conventional) periodic Scheduling Request opportunity.
  • the process proceeds to 205 where the UE uses the periodic SR opportunity in the conventional manner with the process ending at 206. If no periodic SR opportunity is available, then at 207, if the UE did not receive information containing additional PUCCH resource on the PHICH ‘N’ subframes ago, (as mentioned above, in various embodiments N can be 1, 2 or a maximum of 4) , then the process ends at 208. If however the relevant PHICH signal had been received N subframes ago, then the process can proceed to 209 where the UE extracts the SR frequency and code contained in the configuration of periodically-available resources and uses this information to access the spare, allocated PUCCH for a Scheduling Request. The process then terminates at 210.
  • PUCCH resources are signalled with DCI (Downlink Control Information) instead.
  • DCI Downlink Control Information
  • the UEs are divided into groups of size n*m (where n is the PUCCH multiplexing level as referred to above and m is an integer) .
  • Each group is associated with a unique Scheduling Request -Radio Network Temporary Identity (SR-RNTI) which is semi-statically configured for each UE along with a PUCCH index i relative to the group.
  • SR-RNTI Scheduling Request -Radio Network Temporary Identity
  • a UE which needs to transmit a Scheduling Request decodes the DCI which is scrambled with its SR-RNTI and then calculates its SR resource according to the resource allocation in the DCI and the resource index it is configured with.
  • the UE maps the allocated Resource Blocks to a contiguous ordered list.
  • the Resource Block which is allocated for the UE is the (floor (i/n) and the allocated code in this Resource Block is (i mod n) .
  • the resource allocation is signalled with DCI format 0 or alternatively with a new format including Carrier Indicator, Resource Block assignment, UL index, Resource allocation type.
  • ‘Resource allocation type’ reuses the Rel-12 allocation types, that is; type 0 and type 2, in order to allow contiguous as well as non-contiguous resource allocation (for the case where m is greater than 1 and several PUCCH groups are allocated with a single DCI) .
  • the other field definitions in the alternative format comply with Rel-10 DCI format 0 fields.
  • DCI received in subframe ‘n’ is normally pointing to subframe n+4 (in FDD-LTE (Frequency Division Duplex-LTE) ) , however this value can be considered as n+m where m is less than or equal to 4 (in FDD-LTE) . In TD-LTE (Time Division-LTE) , these values may be different.
  • the flow chart of FIG. 3 illustrates an example of how a UE 102a handles the DCI signalling method described above for a discrete transmission time interval (TTI) .
  • TTI discrete transmission time interval
  • the process starts at 301 with the start of a new TTI.
  • the UE determines whether or not it has any data to transmit (to the eNB) . If there is no data to transmit then the process ends at 303. If on the other hand, there is data to be transmitted, then the process proceeds to 304 where the UE determines whether it can use a (conventional) periodic Scheduling Request opportunity. If there is the possibility of using the periodic Scheduling Request opportunity then the process proceeds to 305 where the UE uses the periodic SR opportunity in the conventional manner with the process ending at 306.
  • the process ends at 308. If however the relevant DCI was received and decoded m subframes ago, then the process can proceed to 309 where the UE calculates its dedicated SR resource (from the DCI) and at 310 uses the configured SR frequency and code to access the spare, allocated PUCCH for a Scheduling Request. The process then terminates at 311.
  • a UE is configured with more than one resource index with the intention to allow the UE to belong to more than one PUCCH group for a more flexible allocation. For example, UEs designated as low priority could belong to a single group while high priority users or critical mission applications may belong to several groups.
  • a UE is configured with more than one resource index with the intention to allow the UE to signal SR on different resources in the same subframe or in another subframe.
  • the particular resource that the UE selects to use may serve as an’ indication’ for the eNB. In particular, it may serve as an indication for the required UL allocation size.
  • the UE may take one of the following optional steps; not to use either of the resources in cases where there is no uplink data to transmit; choose signal A only when there is a small sized uplink transmission such as a TCP Ack; choose signal B only when there is a medium-sized uplink transmission such as a periodic report; choose signals A and B when there is a large sized uplink transmission such as a video file upload.
  • the small/medium/large transmissions are preconfigured or signalled by the eNB via System Information.
  • the processing circuit 108 may allocate the spare PUCCH resource in such a way to ensure that there is no conflict between SR and Ack/Nack transmissions.
  • the processing circuit 108 selects UL (Uplink) allocations and signalling of the UL allocation (to other UEs) in such way that the group index and sequence index that would be used for Ack/Nack on the PHICH will not collide with the PHICH resources already allocated for additional SR resources signalling.
  • the processing circuit 108 ensures that that DL (Downlink) allocation and signalling is done in such way that the calculated PUCCH resource to be used for Ack/Nack for this transmission will not collide with the PUCCH resource intended to be used for additional SR transmission opportunity.
  • the signal processing functionality of the embodiments of the invention may be achieved using computing systems or architectures known to those who are skilled in the relevant art.
  • Computing systems such as, a desktop, laptop or notebook computer, hand-held computing device (PDA, cell phone, palmtop, etc. ) , mainframe, server, client, or any other type of special or general purpose computing device as may be desirable or appropriate for a given application or environment can be used.
  • the computing system can include one or more processors which can be implemented using a general or special-purpose processing engine such as, for example, a microprocessor, microcontroller or other control module.
  • the computing system can also include a main memory, such as random access memory (RAM) or other dynamic memory, for storing information and instructions to be executed by a processor. Such a main memory also may be used for storing temporary variables or other intermediate information during execution of instructions to be executed by the processor.
  • the computing system may likewise include a read only memory (ROM) or other static storage device for storing static information and instructions for a processor.
  • ROM read only memory
  • the computing system may also include an information storage system which may include, for example, a media drive and a removable storage interface.
  • the media drive may include a drive or other mechanism to support fixed or removable storage media, such as a hard disk drive, a floppy disk drive, a magnetic tape drive, an optical disk drive, a compact disc (CD) or digital video drive (DVD) read or write drive (R or RW) , or other removable or fixed media drive.
  • Storage media may include, for example, a hard disk, floppy disk, magnetic tape, optical disk, CD or DVD, or other fixed or removable medium that is read by and written to by media drive.
  • the storage media may include a computer-readable storage medium having particular computer software or data stored therein.
  • an information storage system may include other similar components for allowing computer programs or other instructions or data to be loaded into the computing system.
  • Such components may include, for example, a removable storage unit and an interface , such as a program cartridge and cartridge interface, a removable memory (for example, a flash memory or other removable memory module) and memory slot, and other removable storage units and interfaces that allow software and data to be transferred from the removable storage unit to computing system.
  • the computing system can also include a communications interface.
  • a communications interface can be used to allow software and data to be transferred between a computing system and external devices.
  • Examples of communications interfaces can include a modem, a network interface (such as an Ethernet or other NIC card) , a communications port (such as for example, a universal serial bus (USB) port) , a PCMCIA slot and card, etc.
  • Software and data transferred via a communications interface are in the form of signals which can be electronic, electromagnetic, and optical or other signals capable of being received by a communications interface medium.
  • computer program product may be used generally to refer to tangible media such as, for example, a memory, storage device, or storage unit.
  • These and other forms of computer-readable media may store one or more instructions for use by the processor comprising the computer system to cause the processor to perform specified operations.
  • Such instructions generally referred to as ‘computer program code’ (which may be grouped in the form of computer programs or other groupings) , when executed, enable the computing system to perform functions of embodiments of the present invention.
  • the code may directly cause a processor to perform specified operations, be compiled to do so, and/or be combined with other software, hardware, and/or firmware elements (e.g., libraries for performing standard functions) to do so.
  • the software may be stored in a computer-readable medium and loaded into computing system using, for example, removable storage drive.
  • a control module in this example, software instructions or executable computer program code
  • the processor in the computer system when executed by the processor in the computer system, causes a processor to perform the functions of the invention as described herein.
  • inventive concept can be applied to any circuit for performing signal processing functionality within a network element. It is further envisaged that, for example, a semiconductor manufacturer may employ the inventive concept in a design of a stand-alone device, such as a microcontroller of a digital signal processor (DSP) , or application-specific integrated circuit (ASIC) and/or any other sub-system element.
  • DSP digital signal processor
  • ASIC application-specific integrated circuit
  • aspects of the invention may be implemented in any suitable form including hardware, software, firmware or any combination of these.
  • the invention may optionally be implemented, at least partly, as computer software running on one or more data processors and/or digital signal processors or configurable module components such as FPGA devices.
  • the elements and components of an embodiment of the invention may be physically, functionally and logically implemented in any suitable way. Indeed, the functionality may be implemented in a single unit, in a plurality of units or as part of other functional units.

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Abstract

L'invention concerne un procédé et un appareil pour des systèmes de communications cellulaires d'évolution à long terme (100). L'invention identifie des ressources PUCCH (canal physique de commande de liaison montante) libres, inutilisées, pouvant être utilisées par des équipements d'utilisateur (103a, 103b, 103c) pour envoyer des demandes de programmation en vue d'une transmission de données. Un nœud B évolué (101) peut signaler la disponibilité de telles ressources à un UE, au moyen d'informations PHICH (canal physique de demande de répétition d'activation hybride) ou d'informations de commande de liaison descendante (DCI).
PCT/CN2016/104183 2015-12-30 2016-11-01 Dispositifs de système de communications cellulaires Ceased WO2017113979A1 (fr)

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US12432716B2 (en) * 2021-03-31 2025-09-30 Qualcomm Incorporated Dynamic reconfiguration of uplink control channel resources for a scheduling request

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