CN109391408B - Scheduling request indication transmission method in orthogonal frequency division multiplexing system - Google Patents
Scheduling request indication transmission method in orthogonal frequency division multiplexing system Download PDFInfo
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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
- H04L5/0001—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
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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
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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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 signaling, i.e. of overhead other than pilot signals
- H04L5/0057—Physical resource allocation for CQI
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Abstract
The embodiment of the invention provides a scheduling request indication transmission method in an orthogonal frequency division multiplexing system. The method comprises the following steps: based on the configuration information of the SR resource, the user equipment indicates the trigger of the scheduling request through the MAC layer, and transmits the scheduling request through the physical layer. The embodiment of the invention provides a scheduling request indication transmission method in an orthogonal frequency division multiplexing system under the condition that a network side indicates SR resource configuration to user equipment.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method for indicating and transmitting a scheduling request in an orthogonal frequency division multiplexing system.
Background
In a broadband access system, the available bandwidth of the system is divided into a plurality of continuous or discontinuous sub-bands, and each sub-band is transmitted by using Orthogonal Frequency Division Multiplexing (OFDM) technology. The sub-band is divided into synchronous sub-band and common sub-band according to the function, the synchronous sub-band is mainly used for the synchronization and broadcast channel of the up-down line, and the common sub-band is used for the transmission of normal service.
To reduce cost and implementation complexity, a User Equipment (UE) may support both multi-subband and single subband modes of operation, i.e., the UE receiver bandwidth need not be the entire system bandwidth, may support reception of multiple or a single subband, and need not necessarily be able to receive all subbands. Depending on the hardware capabilities, the UE supports operation on all or part of the sub-bands, with the simplest (i.e., low cost) UE supporting operation on a single sub-band. In this way, the requirements on the bandwidth of the UE receiver are reduced, and the requirements on the hardware capability of the system are also reduced.
The power load monitoring communication network is a typical application scenario, and the frequency spectrum of the power load monitoring communication network is discretely distributed on a 230M frequency band. The distribution diagram of the 230MHz frequency resource of the network is shown in fig. 1. It can be seen from the figure that the frequency spectrum is comb-shaped, the frequency resources of the frequency band can be divided into a plurality of sub-bands, the sub-band of the lowest frequency point is 223.525MHz, and the sub-band of the highest frequency point is 231.65 MHz.
For the UE supporting the single subband operating mode, Downlink Control Information (DCI) carried on a Downlink Control channel (PDCCH) must be independently transmitted on each subband, otherwise, the single subband UE cannot monitor the PDCCH due to the limitation of the receiver bandwidth. Therefore, a system scheme needs to be designed according to the characteristics of the frequency resources in the 230MHz frequency band, the requirement of the single-subband UE operating mode and the requirement of coverage, and for the power communication network which has indicated the SR resource configuration to the user equipment, a transmission method which further indicates the SR is also needed.
Disclosure of Invention
The present invention provides a scheduling request indication transmission method in an orthogonal frequency division multiplexing system that overcomes or at least partially solves the above-mentioned problems.
According to an aspect of the present invention, there is provided a scheduling request indication transmission method in an orthogonal frequency division multiplexing system, including:
based on the configuration information of the SR resource, the user equipment indicates the trigger of the scheduling request through the MAC layer, and transmits the scheduling request through the physical layer.
The embodiment of the invention provides a scheduling request indication transmission method in an orthogonal frequency division multiplexing system under the condition that a network side indicates SR resource configuration to user equipment.
Drawings
FIG. 1 is a schematic diagram of a distribution of frequency resources in a 230MHz frequency band of a power network according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating a radio frame structure in a communication system according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a method for scheduling request indication transmission in an ofdm system according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a ue according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
The power communication network is developed to ensure safe and stable operation of the power system. The system is combined with a relay protection and safety and stability control system and a dispatching automation system of a power system to be called as three major pillars for safe and stable operation of the power system. At present, the method is the basis of power grid dispatching automation, network operation marketization and management modernization; is an important means for ensuring the safe, stable and economic operation of the power grid; is an important infrastructure of power systems. Because the power communication network has strict requirements on the reliability of communication, the rapidity and the accuracy of protection control information transmission, and the power department has special resource advantages for developing communication, the power companies of most countries in the world establish the power system private communication network mainly by self-construction.
The power communication network has many similarities with the LTE system and the Narrow-Band Internet of Things (NB-IoT) based on cellular, but also has the characteristics of the power system, and the power system is an orthogonal frequency division multiplexing system. Based on the power communication system, the single-subband frame structure design of the 230MHz frequency band power network system is shown in FIG. 2, and SR occupies 4 symbols in a radio frame and is positioned in the last 4 symbols of subframe 1, so that UE does not need to know the SR transmitted subframe number. Specifically, in the system, a radio frame is 25ms in length, and includes 5 subframes of 5ms, each subframe including 9 OFDM symbols. The uplink and downlink resources are planned according to the characteristics of the uplink and downlink services of the system. The downlink resource is 13 symbols, which are 9 symbols of the subframe 0 and the first 4 symbols of the subframe 1. The uplink resource includes the last 4 symbols of the subframe 1, and the subframe 2, the subframe 3, and the subframe 4, where if an SR is configured on a certain radio frame, the SR is the last 4 symbols of the subframe 1. The radio frame structure of all embodiments of the present invention as shown in fig. 2 will not be described again.
The embodiment of the present invention provides a method for indicating transmission of a scheduling request in an orthogonal frequency division multiplexing system when a network side indicates SR resource allocation to a user equipment, as shown in fig. 3, including:
s100, based on the configuration information of the SR resource, the user equipment indicates the triggering of the scheduling request through the MAC layer and sends the scheduling request through the physical layer.
The method of the embodiment of the invention is a User side method, and the main execution body of the User side in a communication system is User Equipment (UE). The user equipment can be various wired terminals or wireless terminals in a communication system, such as a mobile phone, a tablet, a computer and the like. The UE in this document refers to the UE according to the embodiment of the present invention, and the UE may be replaced with each other in context semantics.
The Scheduling Request (SR) according to the embodiment of the present invention is a manner in which a UE requests a base station (Evolved Node B, eNodeB) for resources to transmit new data. In a power communications network, a UE sends a Scheduling Request (SR) to request uplink resources for a new transmission from an eNodeB. The SR is triggered by the BSR, and the eNodeB will repeatedly transmit the SR according to a certain principle on the UE allocating dedicated SR resources or fast scheduling SR resources according to the number of one time. The SR is transmitted repeatedly in the time domain, supporting coverage enhancement through energy accumulation.
The user equipment in the embodiment of the invention acquires the SR transmission resource according to the configuration information of the SR resource through the triggering of the MAC layer indication scheduling request and sends the scheduling request through the physical layer, thereby providing the SR indication transmission method in the power communication network.
The embodiment of the invention carries out SR transmission indication based on the user equipment configured with the SR resources, and the related parameters of the SR transmission indication depend on the configuration information of the SR resources.
In one embodiment, the configuration information of the SR resource includes part or all of the following parameters: SR user resident factor SR-resettf, SR repetition factor SR-NumRepetitionfactor, SR maximum transmission times dsr-TransMax, UE special SR configuration information and fast-tuning SR configuration information;
the SR user dwell factor SR-persistent F is used for indicating the time interval of SR resources on each sub-band in a cell;
the SR repetition factor SR-NumRepetitionfactor is used for indicating the repetition frequency of the SR transmission;
SR maximum transmission time dsr-TransMax, which refers to the maximum time for SR transmission;
the UE-specific SR configuration information is a configuration parameter of a specific scheduling request resource sent by a network side to the UE, and includes setting up a UE-specific SR configuration and/or releasing the UE-specific SR configuration, where the setting up the UE-specific SR configuration includes SR resource location information;
the fast scheduling SR configuration information is a configuration parameter of a scheduling request resource sending resource pre-allocated by a network side for a user equipment performing a fast scheduling mode transmission service, and includes a configuration for establishing a fast scheduling SR and/or a configuration for releasing the fast scheduling SR, where the configuration for establishing the fast scheduling SR includes SR resource location information.
In the embodiment of the invention, in order to be compatible with single sub-band UE and optimize the reasonable utilization of sub-band resources, the SR resources are divided into the SR resources special for the UE and the fast scheduling SR resources.
The UE-specific SR resource is a resource allocated by the network side to the UE for transmitting a specific scheduling request, and the resource is periodically valid. The fast scheduling SR resource is a resource that is planned in advance by the network side for the UE that performs the fast scheduling mode service transmission to send the SR, and the resource can be used only when the condition that the UE performs the service transmission in the fast scheduling mode is satisfied, and it can also be called as the fast scheduling SR resource, and the resource is event-type periodic and effective.
The fast scheduling mode refers to that when a network side schedules the UE, the network side allocates resources to other subbands (i.e., non-resident subbands) of the UE because the resident subband where the UE is located is performing data transmission, and the UE performs service data transmission on the non-resident subband indicated by the scheduling. Therefore, the UE can be ensured to transmit data in time, and system resources can be better and reasonably utilized.
In all embodiments of the invention, the repeated sending of the SR belongs to one-time SR transmission; the SR resource location information is a parameter related to a SR resource sending location configured for the UE, and is not described herein again.
In an optional embodiment, in S100, the ue indicates triggering of a scheduling request through a MAC layer, and sends the scheduling request through a physical layer, where the scheduling request further includes a first indication transmission manner or a second indication transmission manner;
the first indication transmission mode comprises the following steps:
the user equipment indicates the triggering of a scheduling request through an MAC layer and maintains the repeated sending of the scheduling request through a physical layer; the physical layer sends the scheduling request based on the first sending indication and each repeated sending indication of the physical layer;
the second indication transmission mode comprises the following steps:
the user equipment indicates the triggering of a scheduling request through an MAC layer and maintains the repeated sending of the scheduling request; and the physical layer transmits the scheduling request based on the first transmission instruction and each repeated transmission instruction of the MAC layer.
The embodiment of the invention provides two SR indication transmission methods, which have the following common points: indicating, by a MAC layer, a trigger of a scheduling request, and the physical layer sending the scheduling request. The triggering of the scheduling request indicated by the MAC layer is each triggering within the SR maximum transmission times dsr-TransMax. The physical layer sends the scheduling request, which means that the SR is specifically sent to the network side each time. The difference points are as follows: and the first indication transmission mode maintains the repeated sending of the scheduling request through a physical layer, and the second indication transmission mode maintains the repeated sending of the scheduling request through an MAC layer. The repeated transmission refers to the repeated transmission times of each trigger in the SR maximum transmission times dsr-TransMax, and is related to an SR repeated time factor SR-NumRepetitionfactor in the configuration information of the SR resource.
In the first indication transmission mode, after the MAC indicates the triggering of the SR, the physical layer carries out the indication of SR repeated transmission according to the configuration information of the SR resource, and the physical layer carries out each time of SR transmission according to the indication of the own SR repeated transmission. In the second indication transmission mode, after the MAC indicates the triggering of the SR, the MAC layer instructs the SR repeated transmission according to the configuration information of the SR resource, and the physical layer instructs the SR repeated transmission each time according to the own SR repeated transmission.
In an optional embodiment, the ue indicates triggering of a scheduling request through a MAC layer and sends the scheduling request through a physical layer, further comprising: for the first indication transmission mode, the physical layer acquires the SR resource position and the SR repetition times of the scheduling request according to the configuration information of the SR resource; and for the second indication transmission mode, the physical layer acquires the SR resource position of the scheduling request according to the configuration information of the SR resource.
In an alternative embodiment of the method according to the invention,
in the first indication transmission mode and the second indication transmission mode, the obtaining, by the physical layer, the SR resource location of the scheduling request according to the configuration information of the SR resource includes: the physical layer determines an SR resource type corresponding to an SR resource used for sending the SR according to the scheduling mode of the user equipment, wherein the SR resource type is a UE (user equipment) -dedicated SR or a fast-scheduling SR, and SR resource position information in the SR resource type is obtained;
in the first indication transmission mode, the acquiring, by the physical layer, the SR repetition number of the scheduling request according to the configuration information of the SR resource includes: and the physical layer acquires the SR repetition frequency according to the SR user residence factor, the SR repetition frequency factor and the coverage grade of the user equipment in the SR resource configuration information.
In an optional embodiment, the determining, by the physical layer according to the scheduling method of the user equipment, an SR resource type corresponding to an SR resource used for sending an SR includes:
if the user equipment is in a fast scheduling mode, the SR resource type is a fast scheduling SR; otherwise, the SR resource type is UE-dedicated SR.
The SR special for the UE in the embodiment of the invention is the SR resource special for the UE, and the fast-tuning SR is the SR resource for fast tuning. And the physical layer acquires the SR resource position and the SR repeated times according to the configuration information of the SR resource, and is used for sending the SR to the network side and indicating the SR repeated sending times.
The coverage grade of the user equipment in the embodiment of the invention is as follows:
each cell configures different coverage levels according to the distribution condition of the UE, and gives an RSRP threshold range in each coverage level, and the UE can map the coverage level of the UE according to the RSRP measurement value of the UE and the corresponding RSRP threshold range. The number of coverage levels and the RSRP measurement report mapping for each coverage level are configured by the network side. For example, in a specific implementation, the network side may configure up to 3 coverage classes for a cell according to the UE distribution.
In an optional embodiment, the step of the ue indicating triggering of the scheduling request through the MAC layer in the first indication transmission mode includes:
and if the uplink resource of the configured SR on the current TTI does not conflict with the measurement interval, the SR prohibiting timer does not run and the SR sending times is less than the SR maximum sending times, the MAC layer informs the physical layer of sending an uplink scheduling request on the uplink resource.
In the embodiment of the present invention, when the first indication transmission mode satisfies a specific condition, the MAC layer indicates a primary SR trigger to the physical layer, that is, notifies the physical layer to send an uplink scheduling request on the uplink resource; the SR trigger herein refers to one SR transmission within the SR maximum transmission number dsr-TransMax. The primary SR transmission further includes a plurality of repeated transmissions, and the physical layer indicates the SR repeated transmission in the first transmission mode, where the SR repeated transmission is obtained by the physical layer according to the configuration information of the SR resource, please refer to the related description of the above embodiment. The specific conditions are those comprising: the configured SR uplink resource on the current TTI does not conflict with the measurement interval, the SR prohibit timer SR-ProhibitTimer is not operated, and the SR sending times is less than the SR maximum sending times dsr-TransMax.
The measurement interval is used for measuring the cell to be measured at a certain interval when the bandwidth of the UE receiver is not enough to simultaneously cover the frequency point of the serving cell and the frequency point of the cell to be measured. The different capabilities given to the UE by the pilot frequency point sometimes need to be assisted by a measurement interval to perform measurement; the same frequency measurement does not need to use intervals because the central frequency point to be measured is the central frequency point of the service cell.
In an optional embodiment, in the first indication transmission manner, after or before the MAC layer notifies the physical layer to send the uplink scheduling request on the uplink resource, the method further includes:
adding 1 to the SR sending times; the SR prohibit periodizer is enabled.
The embodiment of the invention counts each SR trigger indicated by the MAC, namely, the number of times of each SR sending is calculated. And when the SR sending times is less than the SR maximum sending times dsr-TransMax, increasing the SR sending times by 1 and simultaneously starting an SR prohibit timer SR-ProhibitTimer every time an SR triggering indication is carried out. The SR prohibit timer SR-ProhibitTimer is carried in the MAC-MainConfig cell, and is similar to the existing LTE technology. Two of the processes are as follows: adding 1 to the SR sending number and starting an SR prohibiting periodizer, where one process is before the MAC layer notifies the physical layer to send an uplink scheduling request on the uplink resource, or before one process is before the MAC layer notifies the physical layer to send an uplink scheduling request on the uplink resource, and the other process is after the MAC layer notifies the physical layer to send an uplink scheduling request on the uplink resource, which is not specifically limited in this embodiment.
In an optional embodiment, the maintaining of the repeated sending of the scheduling request by the physical layer in the first indication transmission mode includes:
based on the triggering of the scheduling request indicated by the MAC layer and the SR repetition times, the physical layer starts to indicate the SR at the SR resource position of the uplink resource and repeatedly indicates the SR at the subsequent SR resource position of the uplink resource.
In the embodiment of the present invention, after the physical layer receives the SR trigger indicated by the MAC layer, the repeated indication is sent by the physical layer every time the SR is sent according to the SR repetition number obtained in the foregoing embodiment.
Specifically, the physical layer determines the type of SR resources available to the physical layer (UE-dedicated SR resources or fast-tuning SR resources), determines the location of the SR resources available to the physical layer according to the high-level configuration parameters, and determines the SR repetition number according to the coverage level of the current UE and the high-level configuration parameters. Finally, the physical layer starts indicating the SR at the last available SR resource location and repeats indicating the SR at the subsequent available SR resource location. The method for determining the available SR resource type by the physical layer is to use the fast scheduling SR resource if the UE is currently in the fast scheduling mode for data transmission according to whether the current UE is in the fast scheduling mode, or else, use the special SR resource of the UE.
In an optional embodiment, in the first indication transmission manner, the maintaining, by the physical layer, the repeated sending of the scheduling request further includes:
and if the physical layer receives the notice of the SR stopping instruction of the MAC layer, the physical layer stops the SR instruction.
In the embodiment of the invention, when the physical layer receives the SR instruction which is notified by the MAC layer and is carried out by stopping the physical layer, if the SR indication frequency of the physical layer does not reach the SR repetition frequency, namely the physical layer indicates that the SR has not completely indicated, the physical layer stops the SR instruction.
In an optional embodiment, the indicating, by the ue, the triggering of the scheduling request through the MAC layer in the second indication transmission mode, and maintaining the repeated sending of the scheduling request includes:
and if the uplink resource of the configured SR on the current TTI does not conflict with the measurement interval, the SR prohibiting timer does not run, the SR repeating timer does not run, the SR sending times are less than the SR maximum sending times, and the current SR repeating count is less than the SR repeating times, the MAC layer informs the physical layer to send the SR on the uplink resource once.
In the second indication transmission mode according to the embodiment of the present invention, when a specific condition is satisfied, the MAC layer indicates one SR transmission to the physical layer, that is, the MAC layer is responsible for triggering and maintaining SR retransmission, each retransmission of the SR is triggered by the MAC layer, the physical layer is responsible for transmitting the SR according to the notification of the MAC layer, and the SR is transmitted once every time the notification of the MAC layer is received; SR triggering here refers to one SR transmission within the SR maximum number of transmissions dsr-TransMax. The primary SR transmission further includes a plurality of repeated transmissions, and the MAC layer instructs the SR repeated transmission in the second transmission mode, where the SR repeated transmission is obtained by the physical layer according to the configuration information of the SR resource, please refer to the related description of the above embodiment. The specific conditions are those comprising: the uplink resource of the configured SR on the current TTI does not conflict with the measurement interval, the SR prohibit timer SR-ProhibitTimer does not run, the SR repeat timer SR-NumRepetitionTimer does not run, the SR sending times is less than the SR maximum sending times dsr-TransMax, and the current SR repeat count is less than the SR repeating times.
In an optional embodiment, in the second indication transmission manner, after or before the MAC layer notifies the physical layer that the SR is sent on the uplink resource once, the method further includes:
treatment 1: if the current SR repetition count is equal to 0, adding 1 to the SR sending times;
and (3) treatment 2: adding 1 to the current SR repeat count; an SR repeat timer is started.
The embodiment of the invention counts each SR repeated transmission indicated by the MAC, namely the current SR repeated counting. The MAC layer directly indicates each SR repeated transmission according to the condition, in the process of each indication, the current SR repeated count needs to be increased by 1, and an SR repeated timer SR-NumRepetitionitionTimer is started at the same time; and meanwhile, counting each SR trigger indicated by the MAC, judging whether the current SR repeated count is equal to 0, and if so, adding 1 to the SR sending times.
Wherein, in the processing 1 and the processing 2, after the MAC layer notifies the physical layer to send the SR on the uplink resource once, or before the processing 1 notifies the physical layer to send the SR on the uplink resource once, the processing 2 may notify the physical layer to send the SR on the uplink resource once after the MAC layer notifies the physical layer to send the SR on the uplink resource once, which is not limited in this embodiment specifically. But treatment 1 must precede treatment 2.
In an optional embodiment, in the second indication transmission mode, if the current SR repetition count is equal to the SR repetition number, the current SR repetition count is set to 0, and an SR prohibit timer is started.
If the current SR repetition count is equal to the SR repetition times, one-time SR triggering is completed, the current SR repetition count is set to 0, and an SR prohibit timer SR-ProhibitTimer is started at the same time.
In an optional embodiment, the ue in the second indication transmission mode indicates triggering of a scheduling request through a MAC layer and maintains repeated transmission of the scheduling request, further including: and the MAC layer acquires the SR repetition times of the physical layer and is used for maintaining the repeated transmission of the scheduling request.
In the embodiment of the present invention, since the MAC layer simultaneously maintains the triggering of the SR and the repeated transmission of the SR, and the number of times of the repeated transmission of the SR is calculated by the physical layer, the MAC layer needs to obtain the number of times of the repeated transmission of the SR of the physical layer to maintain the repeated transmission of the scheduling request.
In an optional embodiment, in the first indication transmission mode or in the second indication transmission mode, the ue indicates triggering of a scheduling request through a MAC layer and sends the scheduling request through a physical layer, further including: and if the SR sending times is equal to the SR maximum sending times, the MAC layer informs the RRC layer to release an uplink control channel (PUCCH) or a demodulation reference signal (SRS) on the PUCCH, clears all uplink grants and downlink grants, initiates the random access process and cancels all pending SRs.
In the embodiment of the present invention, the pending SR refers to a scheduling request that is considered pending after the SR is triggered and before the SR is cancelled.
In an optional embodiment, in the first indication transmission mode or in the second indication transmission mode, the ue indicates triggering of a scheduling request through a MAC layer and sends the scheduling request through a physical layer, further including: if there is no configured SR uplink resource, the MAC layer initiates the random access procedure and cancels all pending SRs.
According to the above embodiment, a scheduling request indication transmission method in an ofdm system according to the present invention includes the following optional specific embodiments:
the MAC layer processing of the UE is as follows:
when a MAC PDU is assembled and the PDU contains a buffer status until (including) the last BSR event, or the uplink grant can accommodate all pending data, all pending scheduling requests are cancelled, the SR prohibit timer SR-ProhibitTimer is stopped, and the physical layer is notified to stop the ongoing SR indication.
If an SR is triggered and there is no SR pending, the UE will set SR _ COUNTER to 0.
As long as there is a pending SR, at every TTI the UE should:
-if no UL-SCH resources are available for the current TTI:
-if the UE has no uplink resources available to indicate SR in any TTI, initiating a random access procedure and cancelling all pending SRs;
otherwise, if the UE has available uplink resources to indicate the SR in the current TTI and the TTI does not conflict with the measurement interval, and the SR prohibit timer SR-ProhibitTimer is not running:
-if SR _ COUNTER < dsr-TransMax: maximum number of SR transmissions
-adding 1 to SR _ COUNTER;
-informing the physical layer to indicate the SR on available uplink resources configuring the SR;
-starting SR prohibit timer SR-ProhibitTimer.
-otherwise:
-informing the RRC to release PUCCH/SRS;
-clearing all configured uplink and downlink grants;
-initiating a random access procedure once and cancelling all pending SRs.
The SR process of the physical layer of the UE is as follows:
once the MAC layer of the UE informs its physical layer to indicate the SR on the available uplink resources to configure the SR. The physical layer determines the type of available SR resources (UE-dedicated SR resources or fast-tuning SR resources) first, then determines the location of the type of available SR resources according to the high-level configuration parameters, and determines the SR repetition times according to the coverage grade of the current UE and the high-level configuration parameters. Finally, the physical layer starts indicating the SR at the last available SR resource location and repeats indicating the SR at the subsequent available SR resource location. The method for determining the available SR resource type by the physical layer is to use the fast scheduling SR resource if the UE is currently in the fast scheduling mode for data transmission according to whether the current UE is in the fast scheduling mode, or else, use the special SR resource of the UE. When the physical layer receives the SR indication that the physical layer is stopping going on, which is notified by the MAC layer, if the SR indication times of the physical layer does not reach the SR repetition times, namely the physical layer indicates that the SR has not completed all the indications, the physical layer stops the SR indication.
According to the above embodiment, a scheduling request indication transmission method in an ofdm system according to the present invention, an optional specific embodiment of the second transmission mode is as follows:
the SR process of the MAC layer of the UE is as follows:
the scheduling request is used for application of UL-SCH resources for new data transmission. That is, the UE sends the SR to request uplink resources for new data transmission from the base station. When a MAC PDU is assembled and the PDU contains the buffer status until (including) the last BSR event, or the uplink grant can accommodate all pending data, all pending scheduling requests are cancelled, and the SR prohibit timer SR-ProhibitTimer and the SR repeat timer SR-numrepetiontimtimer are stopped.
Wherein the length of the SR repetition timer SR-NumRepetitionTimer is equal to SR-resetF 1 s.
Once the SR is triggered, it is considered a pending scheduling request before it is cancelled.
If an SR is triggered and there is no current pending SR, the UE will set SR _ COUNTER to 0, set SR _ NumRepetition _ COUNTER to 0, and provide the value SR _ NumRepetitions of SR repetition times by the physical layer.
As long as there is a pending SR, at every TTI the UE should:
-if no UL-SCH resources are available for the current TTI:
-if the UE has no uplink resources available to indicate SR in any TTI, initiating a random access procedure and cancelling all pending SRs;
otherwise, if the UE has available uplink resources to indicate the SR in the current TTI and the TTI does not conflict with the measurement interval, and the SR prohibit timer SR-ProhibitTimer is not running, and the SR repeat timer SR-numrepetitationtimer is not running:
-if SR _ COUNTER < dsr-TransMax:
-if SR _ NumRepetition _ COUNTER equals 0:
-adding 1 to SR _ COUNTER;
-if SR _ NumRepetition _ COUNTER < SR _ NumRepetition:
-adding 1 to SR _ NumRepetition _ COUNTER;
-informing the physical layer to indicate the SR on available uplink resources configuring the SR;
-starting the SR repetition timer SR-numrepetitontimtimer.
-otherwise:
-set SR _ NumRepetition _ COUNTER to 0.
-starting SR prohibit timer SR-ProhibitTimer.
-otherwise:
-informing the RRC to release PUCCH/SRS;
-clearing all configured uplink and downlink grants;
-initiating a random access procedure once and cancelling all pending SRs.
In addition, the SR prohibit timer SR-ProhibitTimer is carried in the MAC-MainConfig cell, similar to the existing LTE technology, and the value is the number of time intervals with SR-resetf 1s as the length.
The SR process of the physical layer of the UE is as follows:
the physical layer provides the MAC layer with the value SR _ NumRepetitions of the SR repetition number. Once the MAC layer of the UE informs its physical layer to indicate the SR on the available uplink resources to configure the SR. The physical layer determines the type of SR resources (UE-specific SR resources or fast-tune SR resources) available to it first, and then determines the location of the SR resources available to it according to the high-level configuration parameters. Finally, the physical layer indicates the SR at the last available SR resource location. The method for determining the available SR resource type by the physical layer is to use the fast scheduling SR resource if the UE is currently in the fast scheduling mode for data transmission according to whether the current UE is in the fast scheduling mode, or else, use the special SR resource of the UE.
The user equipment of the scheduling request indication transmission method in the orthogonal frequency division multiplexing system based on the embodiment of the invention comprises an SR indication transmission module, wherein the SR indication transmission module is used for: based on the configuration information of the SR resource, the user equipment indicates the trigger of the scheduling request through the MAC layer, and transmits the scheduling request through the physical layer.
The user equipment according to the embodiment of the present invention is configured to implement the method for transmitting the scheduling request indicator in the ofdm system according to the embodiment of the present invention, and this embodiment and the following embodiments correspond to the method for transmitting the scheduling request indicator in the ofdm system one to one, and for specific description of each embodiment, reference is made to the method for transmitting the scheduling request indicator in the ofdm system, which is not described herein again.
In an optional embodiment, the configuration information of the SR resource includes part or all of the following parameters: SR user resident factor SR-resettf, SR repetition factor SR-NumRepetitionfactor, SR maximum transmission times dsr-TransMax, UE special SR configuration information and fast-tuning SR configuration information;
the SR user dwell factor SR-persistent F is used for indicating the time interval of SR resources on each sub-band in a cell;
the SR repetition factor SR-NumRepetitionfactor is used for indicating the repetition frequency of the SR transmission;
SR maximum transmission time dsr-TransMax, which refers to the maximum number of SR transmission;
the UE-specific SR configuration information is a configuration parameter of a specific scheduling request resource sent by a network side to the UE, and includes setting up a UE-specific SR configuration and/or releasing the UE-specific SR configuration, where the setting up the UE-specific SR configuration includes SR resource location information;
the fast scheduling SR configuration information is a configuration parameter of a scheduling request resource sending resource pre-allocated by a network side for a user equipment performing a fast scheduling mode transmission service, and includes a configuration for establishing a fast scheduling SR and/or a configuration for releasing the fast scheduling SR, where the configuration for establishing the fast scheduling SR includes SR resource location information.
In an optional embodiment, the SR indication transmission module includes a first indication transmission unit or a second indication transmission unit;
a first indication transmission unit to:
the user equipment indicates the triggering of a scheduling request through an MAC layer and maintains the repeated sending of the scheduling request through a physical layer; the physical layer sends the scheduling request based on the first sending indication and each repeated sending indication of the physical layer;
a second indication transmitting unit for:
the user equipment indicates the triggering of a scheduling request through an MAC layer and maintains the repeated sending of the scheduling request; and the physical layer transmits the scheduling request based on the first transmission instruction and each repeated transmission instruction of the MAC layer.
In an alternative embodiment, the first indication transmitting unit is further configured to: and the physical layer acquires the SR resource position and the SR repetition times of the scheduling request according to the configuration information of the SR resource. The second indication transmission unit is further configured to, by the physical layer, obtain an SR resource location of the scheduling request according to the configuration information of the SR resource.
In an optional embodiment, the acquiring, by the physical layer, the SR resource location of the scheduling request according to the configuration information of the SR resource includes: the physical layer determines an SR resource type corresponding to an SR resource used for sending the SR according to the scheduling mode of the user equipment, wherein the SR resource type is a UE (user equipment) -dedicated SR or a fast-scheduling SR, and SR resource position information in the SR resource type is obtained;
the physical layer acquires the SR repetition times of the scheduling request according to the configuration information of the SR resources, and the method comprises the following steps: and the physical layer acquires the SR repetition frequency according to the SR user residence factor, the SR repetition frequency factor and the coverage grade of the user equipment in the SR resource configuration information.
In an optional embodiment, the determining, by the physical layer according to the scheduling method of the user equipment, an SR resource type corresponding to an SR resource used for sending an SR includes:
if the user equipment is in a fast scheduling mode, the SR resource type is a fast scheduling SR; otherwise, the SR resource type is UE-dedicated SR.
In an optional embodiment, the first indication transmitting unit includes an SR triggering unit, and the SR triggering unit is configured to:
and if the uplink resource of the configured SR on the current TTI does not conflict with the measurement interval, the SR prohibiting timer does not run and the SR sending times is less than the SR maximum sending times, the MAC layer informs the physical layer of sending an uplink scheduling request on the uplink resource.
In an optional embodiment, the SR triggering unit is further configured to:
adding 1 to the SR sending times; the SR prohibit periodizer is enabled.
In an optional embodiment, the first indication transmitting unit further includes an SR repetition indication unit, and the SR repetition indication unit is configured to:
based on the triggering of the scheduling request indicated by the MAC layer and the SR repetition times, the physical layer starts to indicate the SR at the SR resource position of the uplink resource and repeatedly indicates the SR at the subsequent SR resource position of the uplink resource.
In an optional embodiment, the SR repetition indication unit is further configured to:
and if the physical layer receives the notice of the SR stopping instruction of the MAC layer, the physical layer stops the SR instruction.
In an optional embodiment, the second indication transmitting unit includes an indication sending unit, and the indication sending unit is configured to:
and if the uplink resource of the configured SR on the current TTI does not conflict with the measurement interval, the SR prohibiting timer does not run, the SR repeating timer does not run, the SR sending times are less than the SR maximum sending times, and the current SR repeating count is less than the SR repeating times, the MAC layer informs the physical layer to send the SR on the uplink resource once.
In an optional embodiment, the indication sending unit is further configured to:
if the current SR repetition count is equal to 0, adding 1 to the SR sending times;
adding 1 to the current SR repeat count; an SR repeat timer is started.
In an optional embodiment, the indication sending unit is further configured to: and if the current SR repetition count is equal to the SR repetition times, setting the current SR repetition count to 0, and starting an SR prohibiting timer.
In an optional embodiment, the indication sending unit is further configured to: and the MAC layer acquires the SR repetition times of the physical layer and is used for maintaining the repeated transmission of the scheduling request.
In an optional embodiment, the SR indication transmission module further comprises a clearing unit, and the clearing unit is configured to: and if the SR sending times is equal to the SR maximum sending times, the MAC layer informs the RRC layer to release an uplink control channel (PUCCH) or a demodulation reference signal (SRS) on the PUCCH, clears all uplink grants and downlink grants, initiates the random access process and cancels all pending SRs.
In an optional embodiment, the SR indication transmission module further includes a random access unit, and the random access unit is configured to: if there is no configured SR uplink resource, the MAC layer initiates the random access procedure and cancels all pending SRs.
Fig. 4 shows a schematic structural diagram of a user equipment according to an embodiment of the present invention.
Referring to fig. 4, the user equipment includes: a processor (processor)901, a memory (memory)902, and a bus 903;
wherein, the processor 901 and the memory 902 complete the communication with each other through the bus 903;
the processor 901 is configured to call program instructions in the memory 902 to perform the methods provided by the above-mentioned method embodiments, for example, including: based on the configuration information of the SR resource, the user equipment indicates the trigger of the scheduling request through the MAC layer, and transmits the scheduling request through the physical layer.
Another embodiment of the present invention discloses a computer program product comprising a computer program stored on a non-transitory computer-readable storage medium, the computer program comprising program instructions which, when executed by a computer, enable the computer to perform the methods provided by the above-mentioned method embodiments, for example, including: based on the configuration information of the SR resource, the user equipment indicates the trigger of the scheduling request through the MAC layer, and transmits the scheduling request through the physical layer.
Another embodiment of the invention provides a non-transitory computer-readable storage medium storing computer instructions that cause the computer to perform a method provided by the above method embodiments, for example, comprising: based on the configuration information of the SR resource, the user equipment indicates the trigger of the scheduling request through the MAC layer, and transmits the scheduling request through the physical layer.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
The above-described embodiments of a network device and a user equipment are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, the method of the present application is only a preferred embodiment and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. A method for transmitting scheduling request indication in an orthogonal frequency division multiplexing system is characterized by comprising the following steps:
based on the configuration information of the SR resources, the user equipment indicates the triggering of the scheduling request through the MAC layer and sends the scheduling request through the physical layer;
wherein the configuration information of the SR resource includes part or all of the following parameters: SR user resident factor SR-resettf, SR repetition factor SR-NumRepetitionfactor, SR maximum transmission times dsr-TransMax, UE special SR configuration information and fast-tuning SR configuration information;
the SR user dwell factor SR-persistent F is used for indicating the time interval of SR resources on each sub-band in a cell;
the SR repetition factor SR-NumRepetitionfactor is used for indicating the repetition frequency of the SR transmission;
SR maximum transmission time dsr-TransMax, which refers to the maximum number of SR transmission;
the UE-specific SR configuration information is a configuration parameter of a specific scheduling request resource sent by a network side to the UE, and includes setting up a UE-specific SR configuration and/or releasing the UE-specific SR configuration, where the setting up the UE-specific SR configuration includes SR resource location information;
the fast scheduling SR configuration information is a configuration parameter of a resource for sending a scheduling request, which is pre-allocated by a network side for a user equipment performing a fast scheduling mode transmission service, and includes setting up a fast scheduling SR configuration and/or releasing the fast scheduling SR configuration, where the setting up the fast scheduling SR configuration includes SR resource location information;
the user equipment indicates the triggering of a scheduling request through an MAC layer and sends the scheduling request through a physical layer, and further comprises a first indication transmission mode or a second indication transmission mode;
the first indication transmission mode comprises:
the user equipment indicates the triggering of a scheduling request through an MAC layer and maintains the repeated sending of the scheduling request through a physical layer; the physical layer sends the scheduling request based on the first sending indication and each repeated sending indication of the physical layer;
the second indication transmission mode comprises the following steps:
the user equipment indicates the triggering of a scheduling request through an MAC layer and maintains the repeated sending of the scheduling request; the physical layer sends the scheduling request based on the first sending instruction and each repeated sending instruction of the MAC layer;
wherein the ue indicates the trigger of the scheduling request through the MAC layer and sends the scheduling request through the physical layer, further comprising: for the first indication transmission mode, the physical layer acquires the SR resource position and the SR repetition times of the scheduling request according to the configuration information of the SR resource; for the second indication transmission mode, the physical layer acquires the SR resource position of the scheduling request according to the configuration information of the SR resource;
wherein, in the first indication transmission mode and the second indication transmission mode, the physical layer obtains the SR resource location of the scheduling request according to the configuration information of the SR resource, including: the physical layer determines an SR resource type corresponding to an SR resource used for sending the SR according to the scheduling mode of the user equipment, wherein the SR resource type is a UE (user equipment) -dedicated SR or a fast-scheduling SR, and SR resource position information in the SR resource type is obtained;
in the first indication transmission mode, the acquiring, by the physical layer, the SR repetition number of the scheduling request according to the configuration information of the SR resource includes: and the physical layer acquires the SR repetition frequency according to the SR user residence factor, the SR repetition frequency factor and the coverage grade of the user equipment in the SR resource configuration information.
2. The method of claim 1, wherein the determining, by the physical layer according to the scheduling manner of the user equipment, the SR resource type corresponding to an SR resource used for transmitting the SR includes:
if the user equipment is in a fast scheduling mode, the SR resource type is a fast scheduling SR; otherwise, the SR resource type is UE-dedicated SR.
3. The method of any of claims 1-2, wherein the indicating, by the ue, the triggering of the scheduling request via the MAC layer in the first indication transmission mode comprises:
and if the uplink resource of the configured SR on the current TTI does not conflict with the measurement interval, the SR prohibiting timer does not run and the SR sending times is less than the SR maximum sending times, the MAC layer informs the physical layer of sending an uplink scheduling request on the uplink resource.
4. The method of claim 3, wherein the MAC layer notifying the physical layer after or before transmitting the uplink scheduling request on the uplink resource further comprises:
adding 1 to the SR sending times; the SR prohibit timer is started.
5. The method of claim 3, wherein said maintaining repeated transmission of said scheduling request by the physical layer in said first indication transmission mode comprises:
based on the triggering of the scheduling request indicated by the MAC layer and the SR repetition times, the physical layer starts to indicate the SR at the SR resource position of the uplink resource and repeatedly indicates the SR at the subsequent SR resource position of the uplink resource.
6. The method of claim 3, wherein said maintaining repeated transmission of said scheduling request by the physical layer in said first indication transmission mode further comprises:
and if the physical layer receives the notice of the SR stopping instruction of the MAC layer, the physical layer stops the SR instruction.
7. The method of any of claims 1-2, wherein the indicating the triggering of the scheduling request by the user equipment through a MAC layer in the second indication transmission mode and maintaining the repeated sending of the scheduling request comprises:
and if the uplink resource of the configured SR on the current TTI does not conflict with the measurement interval, the SR prohibiting timer does not run, the SR repeating timer does not run, the SR sending times are less than the SR maximum sending times, and the current SR repeating count is less than the SR repeating times, the MAC layer informs the physical layer to send the SR on the uplink resource once.
8. The method of claim 7, wherein the MAC layer notifying the physical layer after or before the SR is transmitted once on the uplink resource further comprises:
if the current SR repetition count is equal to 0, adding 1 to the SR sending times;
adding 1 to the current SR repeat count; an SR repeat timer is started.
9. The method of claim 7, wherein if the current SR repetition count is equal to a SR repetition number, setting the current SR repetition count to 0 and starting an SR prohibit timer.
10. The method of claim 7, wherein the ue indicates the trigger of the scheduling request through a MAC layer in the second indication transmission mode and maintains the repeated transmission of the scheduling request, further comprising: and the MAC layer acquires the SR repetition times of the physical layer and is used for maintaining the repeated transmission of the scheduling request.
11. The method of any of claims 1-2, wherein the user equipment indicates triggering of a scheduling request through a MAC layer and transmits the scheduling request through a physical layer, further comprising: if the SR transmission times is equal to the SR maximum transmission times, the MAC layer informs the RRC layer to release an uplink control channel (PUCCH) or a demodulation reference signal (SRS) on the PUCCH, clear all uplink grants and downlink grants, initiate the random access process and cancel all pending SRs.
12. The method of any of claims 1-2, wherein the user equipment indicates triggering of a scheduling request through a MAC layer and transmits the scheduling request through a physical layer, further comprising: if there is no configured SR uplink resource, the MAC layer initiates the random access procedure and cancels all pending SRs.
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| CN110167188B (en) * | 2019-05-27 | 2022-07-26 | 南京邮电大学 | SR self-adaptive configuration method in unauthorized frequency band |
| EP3869890B1 (en) * | 2020-02-21 | 2023-12-13 | Nokia Technologies Oy | Enhanced scheduling request handling procedure |
| CN112333675B (en) * | 2020-11-25 | 2022-09-13 | 紫光展锐(重庆)科技有限公司 | Data counting method and related device |
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