CN109076519B - Method and apparatus for scheduling transmissions in a cellular communication system - Google Patents
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Abstract
In an LTE cellular communication system (100) with carrier aggregation, a UE (106) is configured to ignore a scheduling request prohibit timer (107) that is set to run when a scheduling request is transmitted on one component carrier and to further transmit a scheduling request on another component carrier before the timer (107) expires. This may reduce the average delay for transmitting uplink data packets by the UE (106) to the evolved node B (101).
Description
Technical Field
Embodiments of the present invention relate generally to cellular communication systems, and more particularly, to an apparatus and method for scheduling transmissions from a user equipment to a network element in a cellular communication system.
Background
Cellular communication systems, such as third generation (3G) mobile telephony standards and techniques are well known. Such 3G standards and technologies are developed by the third generation partnership project. Third generation wireless communications have generally been developed to support macrocell mobile telephone communications. Such macrocells utilize high power base stations to communicate with wireless communication units over a relatively large geographic coverage area. In general, a Radio communication unit, or User Equipment (UE) in general, communicates with a Core Network (CN) of a 3G Radio communication system via a Radio Network Subsystem (RNS). A wireless communication network typically comprises a plurality of radio network subsystems, each comprising one or more cells to which user equipment is attached, thereby connecting to the network. Each macro cell RNS further includes a Controller in the form of a Radio Network Controller (RNC) and operatively coupled to one or more node bs (NodeB). Communication systems and networks have evolved towards broadband and mobile systems. The third generation partnership project has developed Long Term Evolution (LTE) solutions for Mobile Access networks, namely Evolved Universal Mobile telecommunications System terrestrial Radio Access Network (E-UTRAN), and System Architecture Evolution (SAE) solutions for Mobile Core networks, namely Evolved Packet Core (EPC). A macro cell in an LTE system is supported by a base station called an evolved NodeB (abbreviated eNodeB or eNB).
Further development, long term evolution Advanced (LTE-Advanced) has introduced the concept of Carrier Aggregation (CA) to increase bandwidth. Each aggregated Carrier is called a Component Carrier (CC). Each component carrier has a serving cell that can be fully supported by a single eNB. The concept of primary cell (PCell) and secondary cell (SCell) is introduced for supporting CA. The PCell is a serving cell similar to a non-carrier aggregation condition, and is mainly used for (relative to other functions) Physical Uplink Channel (PUCCH) transmission and Radio Resource Control (RRC) connection and reestablishment. An SCell may be attached to a PCell or a set of serving cells through an RRC connection reconfiguration procedure.
Before the UE can transmit data to the eNB, the UE must first receive Uplink (UL) grant information from the eNB. In the LTE system, the UL grant is transmitted to the UE using dynamic Scheduling (i.e., using a so-called Scheduling Request (SR) procedure), a random access procedure, or Semi-Persistent Scheduling (SPS).
In current LTE systems, the UE uses a so-called SR for requesting uplink resources to send a new data transmission. Generally, an eNB configures an SR configuration index for a UE via Radio Resource Connection (RRC) signaling in order for the UE to transmit a scheduling request on a PUCCH. The specific scheduling request configuration index has a designated period and subframe offset value. The UE determines a subframe in which the scheduling request should be transmitted using the SR index to determine a next available opportunity to transmit the scheduling request. In a burst, the total delay of the uplink transmission delay of the first data packet depends on the speed at which the uplink grant is received at the particular UE with data ready to be sent. The scheduling request period is typically 10ms and studies have shown that the latency of the UE's SR opportunity is about 30% of the overall radio access network delay. Further research has shown that any improvement that can reduce the delay in transmitting the first uplink data packet in a burst has a significant impact on the throughput of the overall TCP/IP (Transmission Control Protocol/Internet Protocol).
To avoid unnecessary SR transmission and reduce the load in PUCCH, a scheduling request Prohibit Timer (SR-inhibit Timer-r 9) is introduced in Release-9. The sr-inhibit Timer-r9 information element is located under mac-MainConfig, and may take a value between 0 and 7. The value of sr-ProhibitTimer is typically the scheduling request interval. 0 indicates that no timer for SR transmission is configured on PUCCH. 1 corresponds to one scheduling request interval, 2 corresponds to 2 scheduling request intervals, and so on. The UE will start the timer after sending the SR. When the timer is running, the UE will be effectively prohibited from transmitting the SR on PUCCH.
In conventional carrier aggregation (up to Release 12), only PCell is configured with PUCCH. Therefore, UL grant through SR can pass through only one carrier, i.e., PCell. It has been agreed in Release13 carrier aggregation that SR in PUCCH on SCell should be supported to mitigate resource usage on PCell. Further, one UE has a maximum of two cells configured with PUCCH. Likewise, there should be only one SR procedure regardless of whether a D-SR (Dedicated Scheduling Request) is configured in multiple cells, i.e., only one SR-COUNTER is increased when the D-SR is transmitted on a PCell or SCell and one SR-ProhibitTimer. In case that D-SR resources are configured on scells of PCell and PUCCH, SR-ProhibitTimer should be based on a shorter SR interval.
It has also been agreed that in the case of configuring SRs on activated PUCCH SCell and PCell, when the first uplink packet is ready for Transmission, the Medium Access Control (MAC) entity of the UE instructs the physical channel to transmit an SR when the first opportunity occurs, and selects one SR when the SRs of the UE MAC entity on PUCCH SCell and PCell are in the same TTI (Transmission Time Interval). Which one is left to the UE to perform. For example, if multiple PUCCH resources of SR are valid for TTI, since multiple CCs can be used for SR transmission at the same time, it is left for the UE to perform to decide which PUCCH resource to use.
It would be advantageous to provide a means for reducing the delay of the first uplink data packet in a burst and which is compatible with the concept of a single sr-ProhibitTimer.
Disclosure of Invention
This summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended as an aid in determining the scope of the claimed subject matter.
An embodiment of the present invention provides a method for scheduling transmission from a wireless communication device, where the wireless communication device is located in a cellular communication system, and the cellular communication system supports carrier aggregation, and the method includes: configuring a scheduling request prohibit timer (sr-prohibit timer) for the wireless communication device; configuring a first component carrier configuration for a wireless communication device; configuring a second component carrier configuration for the wireless communication device; configuring a first scheduling request configuration for a first component carrier for a wireless communication device; configuring a second scheduling request configuration for a second component carrier for the wireless communication device; identifying a scheduling request opportunity on one of the first component carrier and the second component carrier and transmitting a scheduling request on the identified component carrier; and starting a scheduling request prohibit timer, identifying another scheduling request opportunity on another component carrier, and transmitting a scheduling request on the other component carrier before the scheduling request prohibit timer expires.
In some embodiments, there may be at least two component carriers configured for scheduling requests. The cellular communication system may be an LTE advanced system.
The present invention is applicable to licensed or unlicensed component carriers. Advantageously, according to some embodiments, the method may enhance the scheduling request configuration procedure in case more than one physical uplink control channel component carrier of the uplink scheduling request configuration serves the user equipment.
By means of the invention, the wireless communication device MAC entity has the ability to ignore sr-ProhibitTimer for scheduling request opportunities that occur on component carriers that are not used for sending scheduling requests. MAC protocol enhancements may be introduced to improve the SR process when multiple PUCCH component carriers are configured by scheduling requests to serve LTE CA-enabled UEs in connected mode.
The operation of sr-ProhibitTimer is effectively decoupled from each CC: the scheduling request opportunity is implemented at the UE MAC entity. Thus, the UE is allowed to select an additional carrier for transmitting a scheduling request even if the sr-ProhibitTimer that is prohibited from transmitting is still running. Advantageously, the scheduling request procedure becomes more robust and the UE can send its first data packet to the eNB with less delay than the current situation.
In an embodiment, the method further comprises: sending, by the wireless communication device, a message to the wireless network element of the cellular communication system to cause the wireless communication device to notify the network element regarding the network element's ability to send scheduling requests before the scheduling request prohibit timer expires. In this case, in response to receipt of the message, the network element may adjust a scheduling request configuration for the at least one component carrier. The network element may be an eNB. If the eNB knows the UE MAC entity behavior, it can jointly configure the scheduling of SR opportunities from multiple component carriers to provide more frequent grant opportunities and thus further reduce the average delay of the first uplink data packet sent from the UE. Delay sensitive applications may particularly benefit from this embodiment. Furthermore, the flexibility of the scheduler in the eNB is enhanced in case the sr-ProhibitTimer will present a bottleneck for the CC; where CCs may be used more frequently by UEs for SR opportunities or experience variable quality channel conditions for a short time.
According to a second aspect of the present invention, there is provided a wireless communication device for a cellular communication system, the cellular communication system supporting carrier aggregation, wherein the wireless communication device is configured with a scheduling request prohibit timer and is arranged to: receiving a first component carrier configuration and a second component carrier configuration; receiving a first scheduling request configuration for a first component carrier and a second scheduling request configuration for a second component carrier; (ii) a Identifying a scheduling request opportunity on one of the first and second component carriers; transmitting a scheduling request on the identified component carrier; starting a scheduling request prohibition timer; identifying another scheduling request opportunity on another component carrier; and transmitting the scheduling request on another component carrier before the scheduling request prohibit timer expires.
In some embodiments, a wireless communication device may be configured with at least two component carrier configurations and a scheduling request configuration.
In an embodiment, the wireless communication device is arranged to configure an index associated with each component carrier, the status of the index depending on whether the component carrier is used to send scheduling requests.
The wireless communication device may be a UE or similar mobile communication device.
When multiple PUCCH component carriers are configured by a scheduling request to serve LTE CA-enabled UEs in connected mode, the present invention may be used to introduce RRC protocol enhancements to improve the SR process.
According to a third aspect of the invention, there is provided a non-transitory computer readable medium having computer readable instructions stored thereon for execution by a processor to implement the method of the first aspect of the invention.
The non-transitory computer readable medium includes at least one of: hard disks, CD-ROMs, optical storage devices, magnetic storage devices, read-only memories, programmable read-only memories, erasable programmable read-only memories, EPROMs, electrically erasable programmable read-only memories, and flash memories.
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Further details, aspects and embodiments of the present application will be described, by way of example only, with reference to the accompanying drawings. Elements in the figures are illustrated for simplicity and clarity and have not necessarily been drawn to scale. The same reference numerals are included in each figure for ease of understanding.
Fig. 1 is a simplified block diagram of a local cellular communication system and its operation in accordance with an exemplary embodiment;
FIG. 2 is a simplified flow diagram of a method of scheduling transmissions from a UE according to an embodiment;
fig. 3 is a simplified flow diagram of operation of a UE in an embodiment.
Detailed Description
Those of ordinary skill in the art will understand and appreciate that the details of the embodiments described herein are merely illustrative of some embodiments of the present application and that the teachings set forth herein are applicable in a variety of contexts.
Referring now to fig. 1, an embodiment of the operation of a partial LTE cellular communication system in the present application is shown and indicated generally at 100, and includes an evolved Node b (eNB) 101. The eNB101 includes a scheduler 102 and a transceiver 103. The eNB101 uses carrier aggregation and supports a first component carrier (CCx) and a second component carrier (CCy), represented by cells 104 and 105, respectively. In other embodiments, the eNB101 may also support more than two component carriers. A carrier-aggregation-enabled (CA-enabled) UE106 is located within the coverage area of both cells 104, 105 simultaneously. The transceiver 103 is arranged in a conventional manner for transmitting and receiving communication signals and data to and from the UE 106. The UE106 is configured with a single scheduling request prohibit timer (sr-ProhibitTimer) 107 and transmitter/receiver means 108 for transmitting and receiving transmissions to and from the eNB 101.
The eNB101 communicates with UEs (e.g., UE 106) that are component carrier enabled and in a connected state, and these UEs may be semi-statically configured with at least one uplink component carrier. The UE may also be configured with periodic scheduling request opportunities on the first component carrier and the second component carrier, and may have these component carriers activated simultaneously for serving the UE. In the eNB, the scheduler 102 may periodically monitor the uplink scheduling load and the activity of the UE and use this information to dynamically adjust the SR scheduling parameters between the two component carriers (CCx and CCy).
When applying the conventional approach to providing only one SR-Prohibit Timer, the UE MAC entity instructs the PHY to send a scheduling request on the first opportunity arrival and will not consider any subsequent SR opportunities (including SR opportunities related to another CC) while the SR-Prohibit Timer is running. In contrast, in the embodiment of fig. 1, even when the sr-ProhibitTimer is running, the UE MAC entity of the UE106 considers other scheduling request opportunities that occur on other component carriers. The sr-ProhibitTimer information element is in the MAC-MainConfig for the cell group (i.e., for all component carriers from a single eNB, such as CCx and CCy as shown in fig. 1).
The present invention can improve some of the disadvantages that the above conventional methods may cause. For example, assume that the UE106 needs to send a scheduling request every 2ms to meet the data delay constraint. Further, assume that CCx can only provide opportunities (due to scheduling request load limitations) every 4ms, while CCy can provide opportunities every 2 ms. If the periods of CCx and CCy are all set to 2ms and the value of sr-ProhibitTimer is set to zero, the scheduling request load on CCx will be unacceptable. On the other hand, if the value of sr-ProhibitTimer is set to 1, perfect interleaving (interlace) of the two component carriers CCx and CCy is impossible. The present invention circumvents these problems by allowing the UE to ignore sr-ProhibitTimer.
The problem becomes even more serious if the UE fails to receive a scheduling grant from the eNB in response to the first transmitted scheduling request, e.g., a scheduling request on CCx. This may happen when the CCx uplink coverage is very poor or due to a scheduling request failure or even due to a failure to receive an uplink grant on a Physical Downlink Control Channel (PDCCH). In that case, the UE will try to send another SR the first time after the SR-ProhibitTimer expires, thus wasting time. Also, this situation is improved by the present invention.
Consider another example where uplink coverage on CCx is very poor and CCx has a scheduling request period of 1ms, CCy has a period of 5ms, and the sr-ProhibitTimer value must be set to 1 due to load limitation on the PUCCH of CCx. In this example, any scheduling request on CCy may be ignored altogether, since the UE is always trying to make a (failed) scheduling request on CCx. Furthermore, dsr-TransMax may have been reached when a scheduling request opportunity on CCy is available, resulting in the scheduling request process being cancelled earlier rather than attempting an alternative link. Again, the present invention can ameliorate these conditions.
Referring now to fig. 2, fig. 2 is a flow diagram of an embodiment of a method for scheduling transmissions by the UE106 of fig. 1.
At 201, a single sr-ProhibitTimer is configured in the UE 106. At 202, a first component carrier CCx (represented by cell 104 in fig. 1) is configured in the UE106 by the eNB101 sending the necessary configuration signaling. The configuration is performed according to known techniques including, for example, RRC connection procedures. At 203, the scheduling request configuration for the component carrier CCx is configured in the UE106 by the eNB101 transmitting the scheduling request configuration including the scheduling request configuration information element, according to conventional techniques. The scheduling request configuration basically informs the UE of PUCCH resources that will be available on component carrier CCx and used for scheduling requests. At 204, the second component carrier CCy (represented by cell 105 in fig. 1) is configured in the UE106 by the eNB101 sending the necessary configuration signaling. The configuration is according to known carrier aggregation techniques. At 205, a scheduling request configuration for component carriers CCy is configured in the UE106 by the eNB101 transmitting the scheduling request configuration including a scheduling request configuration information element, in accordance with conventional techniques. The scheduling request configuration basically informs the UE of PUCCH resources that will be available on the second component carrier CCy and used for scheduling requests. At 206, the UE106 identifies the first scheduling request opportunity occurring on either component carrier and sends a scheduling request to the eNB101 according to conventional techniques. When the scheduling request is sent, the sr-ProhibitTimer starts running (at 207). Even before the sr-ProhibitTimer expires, the UE106 looks for further scheduling request opportunities on another component carrier. When the UE106 identifies a further scheduling request opportunity at 208, the UE106 may transmit another scheduling request on another component carrier at 209. Upon receiving the scheduling grant from the eNB101, the UE106 may transmit a data packet to the eNB at 210 and then terminate the scheduling request procedure. Only one scheduling request procedure runs on the UE MAC entity, thus maintaining compatibility with the currently defined procedures. In addition, the embodiment of fig. 2 is also compatible with a protocol for multiple component carriers in a group having a single sr-ProhibitTimer.
The behavior of UE coverage (overriding) sr-ProhibitTimer may be a matter of choice. For example, in delay tolerant applications, it may be considered more beneficial to place less burden on the UE and the network (from the increased number of scheduling requests that must be handled) rather than reducing the delay time of the uplink data. If the scheme is deemed appropriate, the UE106 may decide to apply such behavior independently; or alternatively, the eNB101 may configure such behavior (through RRC signaling) for the UE. Otherwise, the scheduling request operation may operate as conventional.
In an embodiment, the UE106 is arranged to configure an index associated with the serving component carrier configured for each scheduling request, the status of the index depending on whether the component carrier has been used to send the scheduling request. The present embodiment will now be described with reference to fig. 3 and 1.
In the UE106, an index is defined for the serving CCs (e.g., CCx and CCy in fig. 1) configured per scheduling request. There are three possible states for the index: "initial", "override" and "used". In the "initial" state, sr-ProhibitTimer applies to CC in the legacy case. In the "covered" state, the sr-ProhibitTimer is ignored with respect to the CC, allowing the CC to be selected (as an additional carrier) for sending scheduling requests even if the sr-ProhibitTimer is running. In the "used" state, the scheduling request has been transmitted using the component carrier, and once the scheduling request is transmitted, the sr-ProhibitTimer starts to run, and the index state cannot be changed until a specific scheduling request procedure is ended.
Thus, if the sr-ProhibitTimer last (re-) starts transmitting scheduling requests on CCx, the next scheduling request opportunity that occurs at the user equipment MAC on any other CC (e.g., CCy in fig. 1) can be taken as long as this CC has not been used for transmission since the scheduling request procedure started.
At 301, once the scheduling request configuration for all serving CCs is configured in the user equipment 106 and the SR procedure starts at the UE MAC entity, each index of each CC is set to "initial".
At 302, at each TTI, the user equipment checks and determines whether sr-ProhibitTimer is running, and checks the index of each CC with a scheduling request opportunity to identify the CC whose index is currently set to the "initial", "covered", and "used" states.
At 303, in the UE, a set of "valid" CCs is created. A CC is included in this set only if a particular TTI of interest provides a scheduling request opportunity and (i) the sr-ProhibitTimer is not running/has expired, or (ii) the sr-ProhibitTimer is running, but the index of the CC is in the "covered" state (thus ignoring the sr-ProhibitTimer).
At 304, a CC may be selected from the set of valid CCs; and, as long as SR-TransMax has not been reached, SR will be transmitted on this selected CC.
The SR-ProhibitTimer starts (re-) at 305 each time an SR is sent on a CC. Further, at 306, if not already in the "used" state, the index of that CC is changed to "used" and the indices of all other CCs in the "initial" state, if any, will be changed to "covered".
In an alternative embodiment, the eNB101 in fig. 1 is adapted so that it knows the capability of the UE106 to ignore sr-ProhibitTimer, as described above in connection with fig. 2 and 3. The scheduler 102 of the eNB101 uses this information to optimize the joint configuration of SR related parameters on different component carriers to further reduce the delay time of the UE106 sending the first data packet in a burst.
For example, consider an embodiment of three SR configured carriers CCx, CCy, and CCz, where the SR period for CCx is 1ms, the SR periods for CCy and CCz are 2ms, and SR-ProhibitTimer =1 (i.e., 1 ms). There are two possible configurations; one is that opportunities on CCy alternate with opportunities on CCz, and the other is that opportunities on CCy and on CCz coincide with each other (aligned with each other). If the scheduler 102 knows that the UE can ignore SR-ProhibitTimer, it will determine that the first configuration is the better one to use because the next opportunity will occur at the immediate TTI even if the first (or even the second) SR transmission fails.
The ability of the UE to send notifications to the eNB may be accomplished in various ways (e.g., signaling the ability of the UE through RRC or L1 signaling, etc., at the time of UE initiation, or during operations where the ability may change dynamically).
In yet another embodiment, the UE MAC entity has the capability to handle SR-ProhibitTimer differently for SR opportunities generated by different CCs. In order to provide the UE with the above capabilities, additional signaling from the eNB to the UE would be required in order to inform the UE of the appropriate interpretation for each CC.
The signal processing functions of embodiments of the present invention, and in particular the scheduler 102 and the UE106, may be implemented using computing systems or architectures known to those skilled in the relevant art. A computing system may be used such as a desktop, palmtop or notebook computer, hand-held computing device (PDA, small phone, palmtop, etc.), mainframe, server, client, or any other type of special or general purpose computing device as may be necessary or appropriate for a given application or environment. The computing system may include one or more processors, which may be implemented using a general or special purpose processing engine, such as a microprocessor, microcontroller or other control module.
The computing system may also include a main Memory, such as a Random Access Memory (RAM) or other dynamic Memory, for storing information and instructions to be executed by the processor. Such main memory may also be used for storing temporary variables or other intermediate information during execution of instructions to be executed by the processor. Computing systems may also include Read Only Memories (ROMs) or other static storage devices for storing static information and instructions for the processors.
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), a Digital Video Drive (DVD), or a read or write drive (R or RW), or other removable or fixed media drive. The 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 a media drive. The storage media may include a computer-readable storage medium having stored therein particular computer software or data.
In alternative embodiments, the 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, removable storage units and interfaces, such as a program cartridge and cartridge interface, removable storage (for example, a flash memory or other removable memory module) and a memory slot, as well as other removable storage units and interfaces that allow software and data to be transferred from the removable storage unit to the computing system.
The computing system may also include a communications interface. Such a communication interface may be used to allow software and data to be transferred between the computing system and external devices. The communication interface may include, for example, a modem, a network interface (e.g., an ethernet or other NIC card), a communication port (e.g., a Universal Serial Bus (USB) port), a PCMCIA slot and card, etc. Software and data transferred via the communication interface are in the form of signals which may be electronic, electromagnetic, optical, or other signals capable of being received by the communication interface medium.
In this document, the terms "computer program product," "computer-readable medium" and the like may be used generally to refer to tangible media, such as memory, storage devices, or storage units. These and other forms of computer-readable media may store one or more instructions for use by a processor, including 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. Note that the code may directly cause the processor to perform specified operations, or be compiled to perform such operations, and/or be combined with other software, hardware, and/or firmware elements (e.g., databases for performing standard functions) to perform such operations.
In one embodiment, the operations of the elements are performed using software, which may be stored on a computer-readable medium and loaded into a computer system using, for example, a removable storage drive. When executed by a processor in a computer system, the control module (in this embodiment, software instructions or executable computer program code) causes the processor to perform the functions of the invention as described in this embodiment.
Further, the concepts of the present invention may be applied to any circuit for performing signal processing functions within a network element. It is further contemplated that, for example, a semiconductor manufacturer may employ the concepts of the present invention in the design of stand-alone devices, such as microcontrollers of Digital Signal Processors (DSPs), or application-specific integrated circuits (ASICs), and/or any other subsystem components.
It will be appreciated that the above description, for clarity, has described embodiments of the invention with reference to a single processing logic. However, the inventive concept may equally be implemented by a plurality of different functional units and processors to provide the signal processing functions. Thus, references to specific functional units are only to be seen as references to suitable means for providing the described functionality rather than strict logical or physical structure or organization statements.
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 modular components, e.g. FPGA devices. Thus, 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.
Although the present invention has been described in connection with a number of embodiments, it is not intended to be limited to the specific form set forth herein. Rather, the scope of the invention is limited only by the attached claims. Additionally, although some features may appear to be described in connection with particular embodiments, one skilled in the art will recognize that various features of the described embodiments may be combined in accordance with the invention. In the claims, the term "comprising" does not exclude the presence of other elements or steps.
Furthermore, although individually listed, a plurality of means, elements or method steps may be implemented by e.g. a single unit or processor. Furthermore, although individual features may be included in different claims, these may possibly advantageously be combined, and the inclusion in different claims does not imply that a combination of features is not feasible and/or advantageous. Also, the inclusion of a feature in one category of claims does not imply a limitation to this category, but rather indicates that the feature is equally applicable to other claim categories as appropriate.
Furthermore, the order of features in the claims does not imply any specific order in which the features must be performed and in particular the order of individual steps in a method claim does not imply that the steps must be performed in this order. Rather, the steps may be performed in any suitable order. In addition, singular references do not exclude a plurality. Thus, references to "a", "an", "first", "second", etc., do not preclude a plurality.
Although the present invention has been described in connection with a number of embodiments, it is not intended to be limited to the specific form set forth herein. Rather, the scope of the invention is limited only by the attached claims. Additionally, although some features may appear to be described in connection with particular embodiments, one skilled in the art will recognize that various features of the described embodiments may be combined in accordance with the invention. In the claims, the term "comprising" does not exclude the presence of other elements.
Claims (8)
1. A method of scheduling transmissions from a wireless communication device, the wireless communication device being located in a cellular communication system, and the cellular communication system supporting carrier aggregation, the method comprising:
configuring a scheduling request prohibit timer (sr-prohibit timer) for the wireless communication device;
configuring a first component carrier configuration for the wireless communication device;
configuring a second component carrier configuration for the wireless communication device;
configuring a first scheduling request configuration for the first component carrier for the wireless communication device;
configuring a second scheduling request configuration for the wireless communication device with respect to the second component carrier;
identifying a scheduling request opportunity on one of the first component carrier and the second component carrier and transmitting a scheduling request on the identified component carrier; and
the method further includes starting the scheduling request prohibit timer, identifying another scheduling request opportunity on another component carrier, and transmitting a scheduling request on the other component carrier before the scheduling request prohibit timer expires.
2. The method of claim 1, further comprising configuring the wireless communication device with an index associated with each of the first component carrier and the second component carrier, a status of the index depending on whether a component carrier is used to send a scheduling request.
3. A method according to claim 1 or 2, characterized in that the method comprises: sending, by the wireless communication device, a message to a network element of the cellular communication system to cause the wireless communication device to notify the network element about the network element's ability to send a scheduling request before the scheduling request prohibit timer expires.
4. A method according to claim 3, characterized in that the method comprises: adjusting, at the network element, a scheduling request configuration for at least one component carrier in response to the message received from the wireless communication device.
5. A wireless communication device for a cellular communication system, the cellular communication system supporting carrier aggregation; wherein the wireless communication device is configured with a scheduling request prohibit timer and is configured to:
receiving a first component carrier configuration and a second component carrier configuration;
receiving a first scheduling request configuration for the first component carrier and a second scheduling request configuration for the second component carrier;
identifying a scheduling request opportunity on one of the first and second component carriers;
transmitting a scheduling request on the identified component carrier;
starting a scheduling request forbidding timer;
identifying another scheduling request opportunity on another component carrier; and
transmitting a scheduling request on another component carrier before the scheduling request prohibit timer expires.
6. A wireless communication device according to claim 5, wherein the wireless communication device is arranged to configure an index associated with each of the first and second component carriers, the status of the index depending on whether a component carrier is used to send a scheduling request.
7. A non-transitory computer readable medium having computer readable instructions stored thereon for execution by a processor to implement the method of claim 1.
8. The non-transitory computer-readable medium of claim 7, wherein the non-transitory computer-readable medium comprises at least one of: hard disks, CD-ROMs, optical storage devices, magnetic storage devices, read-only memories, programmable read-only memories, erasable programmable read-only memories, EPROMs, electrically erasable programmable read-only memories, and flash memories.
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| GB1603246.8A GB2547671B (en) | 2016-02-25 | 2016-02-25 | Methods and devices for scheduling transmissions in a cellular communication system |
| PCT/CN2017/071659 WO2017143893A1 (en) | 2016-02-25 | 2017-01-19 | Methods and devices for scheduling transmissions in a cellular communication system |
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| US11350438B2 (en) * | 2017-09-15 | 2022-05-31 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Method for configuring scheduling request, terminal device, and computer storage medium |
| CN109587804A (en) * | 2017-09-28 | 2019-04-05 | 中兴通讯股份有限公司 | Scheduling request sending method and device |
| CN114586454B (en) * | 2020-01-15 | 2023-12-05 | Oppo广东移动通信有限公司 | Scheduling request SR sending method and related device |
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| GB201603246D0 (en) | 2016-04-13 |
| CN109076519A (en) | 2018-12-21 |
| WO2017143893A1 (en) | 2017-08-31 |
| GB2547671B (en) | 2018-04-18 |
| GB2547671A (en) | 2017-08-30 |
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