CN102638333B - Method and device for scheduling uplink data - Google Patents
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Abstract
The embodiment of the invention provides a method and a device for scheduling uplink data. The method comprises the following steps of: performing uplink data transmission to a same uplink subframe n through a base station at uplink scheduling signal transmission time corresponding to each UE of a corresponding uplink scheduling signal transmitted in different downlink subframes, selecting one earlier uplink scheduling signal transmission time, combining local process time delay to obtain one schedule starting time, simultaneously starting scheduling during the schedule starting time by facing to each UE and aiming at a same uplink subframe n, and transmitting the uplink scheduling signal of the uplink subframe n to each UE at the uplink signal transmission time respectively corresponding to each UE, thus even through each UE respectively refers to different TDD (Time Division Duplex) uplink and downlink configurations to perform the transmission of the uplink data scheduling signal, a corresponding uplink scheduling process of the same uplink subframe can be also consistent with a scheduling manner of a performer present system so that the performance complexity of uplink scheduling in the system is reduced.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a method and an apparatus for scheduling uplink data.
Background
Currently, LTE (Long Term Evolution) supports three Duplex modes, namely FDD (Frequency Division Duplex), H-FDD (Half Frequency Division Duplex) and TDD (Time Division Duplex).
The FDD is that uplink transmission and downlink transmission are performed on different carrier frequency bands, and allows a base station and a terminal to perform signal receiving and signal sending simultaneously; TDD refers to that uplink transmission and downlink transmission are performed on the same carrier frequency band, allowing a base station and a terminal to perform signal transmission/signal reception or signal reception/signal transmission in different time periods, respectively.
In LTE and previous wireless communication systems, only one carrier is configured in one cell, and the maximum bandwidth in LTE systems is 20MHz, as shown in fig. 1.
In an LTE-a (Long Term Evolution-Advanced) system, the peak rate of the system is greatly improved compared with that of LTE, and it is required to reach 1Gbps downlink and 500Mbps uplink. The peak rate requirement cannot be achieved if only one carrier with a maximum bandwidth of 20MHz is used. Therefore, the LTE-a system needs to extend the bandwidth that can be used by the terminal, and thus a CA (carrier aggregation) technology is introduced, in which multiple continuous or discontinuous carriers under the same eNB (base station) are aggregated together and simultaneously serve the terminal to provide a required rate. These aggregated carriers are also called CC (component carrier). Each cell may be a component carrier, and cells (component carriers) under different enbs cannot be aggregated. In order to ensure that the UE of the LTE system can operate on each aggregated carrier, each carrier does not exceed 20MHz at maximum, as shown in fig. 2 in particular. Under the base station of LTE-a shown in fig. 2, there are 4 carriers that can be aggregated, and the base station can perform data transmission with the terminal on the 4 carriers at the same time to improve the system throughput.
In the LTE system, both the FDD mode and TDD mode are one radio frame 10ms and one subframe 1 ms. For each radio frame in the TDD mode, seven TDD uplink and downlink subframe configurations are defined, specifically as shown in table 1, where D represents a DL subframe, U represents a UL subframe, and S represents a special subframe of a TDD system; for example, configuration 1 is DSUUDDSUUD.
TABLE 1
(TDD uplink and downlink subframe configuration)
In LTE Rel-11 or later versions of the system, to avoid interference to other TDD systems, LTE cells located in different bands may use different TDD uplink and downlink configurations. For example, referring to fig. 3, carrier 1 and carrier 2 are located in Band a, carrier 3 is located in Band B, and cell 1, cell 2 and cell 3 are cells on carrier 1, carrier 2 and carrier 3, respectively. The TDD uplink and downlink configurations of the cell 1 and the cell 2 are the same, and are both TDD uplink and downlink configuration 1, the TDD uplink and downlink configuration of the cell 3 is different from that of the cell 1 and the cell 2, and is TDD uplink and downlink configuration 2, and if the terminal wants to perform carrier aggregation using the three cells, the TDD uplink and downlink configurations of all aggregated cells of the terminal are different.
In the LTE system, for TDD Uplink and Downlink configuration 1-6 and conventional HARQ (Hybrid automatic repeat reQuest) operation, a terminal transmits according to a PDCCH (Physical Downlink Control Channel) and/or PHICH (Physical HARQ Indication Channel) with DCI format 0 detected in a subframe n, and adjusts a corresponding PUSCH (Physical Uplink Shared Channel) transmission in a subframe n + k (k value is given by table 2) according to the PDCCH and PHICH Indication.
For TDD uplink and downlink configuration 0 and normal HARQ operation, the UE transmits according to PDCCH and/or PHICH with DCI format 0 detected in subframe n, if MSB (Most Significant Bit) of uplink index in DCI format 0 is set to 1, or corresponding resource I in subframe n is 0 or 5PHICH0 PHICH received), the UE adjusts the corresponding PUSCH transmission in subframe n + k (k value given in table 2).
For TDD uplink and downlink configuration 0 and normal HARQ operation, if LSB (Least Significant Bit) of uplink index of DCI format 0 in subframe n is set to 1, or corresponding resource I in subframe n is 0 or 5PHICHPHICH is received at 1, or PHICH is received at subframe n 1 or 6), the UE adjusts the corresponding PUSCH transmission in subframe n + 7.
For TDD uplink and downlink configuration 0, if both MSBs and LSBs of the uplink index in DCI format 0 in subframe n are 1, then the UE adjusts the corresponding PUSCH transmission in both subframe n + k (the k value is given in table 2) and subframe n + 7.
In FDD mode of LTE system, the terminal receives Downlink data in subframe n-4, and feeds back signaling indicating whether the data on the Downlink subframe needs to be retransmitted or not, i.e. feeding back ACK/NACK information, also referred to as PDSCH HARQ (Physical Downlink Shared channel. During carrier aggregation, the ACK/NACK information corresponding to a plurality of downlink carriers in the subframe n-4 is fed back in the uplink subframe n at the same time.
In the TDD mode of the LTE system, a UE (terminal) may feed back ACK/NACK information corresponding to multiple downlink subframes in the same uplink subframe, that is, when the UE detects PDSCH transmission in a downlink subframe n-K or indicates PDCCH transmission released by downlink semi-persistent scheduling, feeding back corresponding ACK/NACK information in the uplink subframe n, where K belongs to K, and the value of the set K is related to TDD uplink and downlink configuration of the system and a specific subframe number, as shown in table 2 specifically; specifically, for special subframe configurations 0 and 5 under a normal CP (cyclic prefix) and special subframe configurations 0 and 4 under an extended CP, the special subframe has no ACK/NACK feedback, that is, the UE does not feed back ACK/NACK information for the special subframe.
TABLE 2
(TDD Downlink-related K value: K: { K0，k1，…kM-1})
As shown in table 2, the radio frames are sequentially arranged, that is, if the last subframe in the radio frame a is K, the first subframe in the radio frame a +1 is K +1, and table 2 only gives the case of K for each uplink subframe by taking a radio frame as an example, where n-K < 0 indicates the downlink subframe in the previous radio frame.
In the LTE system, for all UEs that need to perform uplink data transmission in subframe n, the transmission time n-m of the scheduling signaling is the same, and in the implementation process, the base station starts scheduling operation at a certain time before transmitting the scheduling signaling due to device delay and the like before transmitting the scheduling signaling. For example, referring to fig. 4, the base station performs scheduling in the Timing1 phase, and performs scheduling signaling transmission on all UEs that need to perform uplink data transmission in the subframe n in the first subframe n-m in the Timing2 phase, and assuming that the maximum scheduling processing delay at the base station side is T, S is greater than or equal to m + T, where a specific value of m may be determined according to actually used TDD uplink and downlink configuration and a subframe index number. The base station completes the scheduling process at the Timing1 stage, that is, completes the processes of PUSCH resource allocation and MCS (Modulation and Coding Scheme ) determination and the like for the uplink subframe n for all UEs, and then performs actual scheduling signaling transmission for all UEs which need to perform uplink data transmission in the subframe n-m at the Timing2 stage.
In an LTE-a (Long Term Evolution-Advanced ) TDD system, for a UE aggregating multiple carriers using different TDD uplink and downlink configurations on different frequency bands, when a base station uses cross-carrier scheduling, if scheduling is performed according to the TDD uplink and downlink configuration notified by system information corresponding to a currently scheduled carrier, a scheduling subframe that sends a scheduling signaling may be an uplink subframe on the scheduled carrier. For example, referring to fig. 5A, for CA UEs (aggregated UEs) simultaneously operating on Band1 and Band2, when the base station uses cross-carrier scheduling, if the uplink subframe 7 on Band2 is still scheduled according to TDD uplink/downlink configuration 2, the uplink scheduling signaling needs to be sent on subframe 3 of Band1, and subframe 3 of Band1 is an uplink subframe and cannot send the uplink scheduling signaling. For this situation, the currently proposed solution is to schedule the CAUE on the Band2 according to the TDD uplink/downlink configuration 1, that is, the uplink scheduling signaling is sent on the downlink subframe 1 of the Band1, and the TDD uplink/downlink configuration used by this scheduled carrier, which is different from the TDD uplink/downlink configuration notified by the system information, is called TDD uplink/downlink reference configuration.
As shown in fig. 5B, since the TDD uplink and downlink reference configuration used by the uplink on Band2 is different from the TDD uplink and downlink configuration notified by the system information on this carrier, the base station transmits uplink scheduling signaling of uplink subframe 7 of Band2 on downlink subframe 1 of Band1 for the case operating on Band2, and transmits uplink scheduling signaling of uplink subframe 7 of Band2 on downlink subframe 3 of Band2 for non-CA UEs (non-aggregation UEs).
And when the base station uses the carrier scheduling, the base station can execute scheduling according to the TDD uplink and downlink configuration notified by the system information corresponding to the currently scheduled carrier. For example, as shown in fig. 6A, for CA UEs simultaneously operating on Band1 and Band2, the base station sends the uplink scheduling signaling of uplink subframe 7 of Band1 on downlink subframe 1 of Band1, and sends the uplink scheduling signaling of uplink subframe 7 of Band2 on downlink subframe 3 of Band 2; for another example, referring to fig. 6B, for CA UE simultaneously operating on Band1 and Band2, non-CA UE 1 operating on Band1 alone, and non-CA UE2 operating on Band2 alone, the base station sends uplink scheduling signaling of uplink subframe 7 of Band1 for CA UE on downlink subframe 1 of Band1, sends uplink scheduling signaling of uplink subframe 7 of Band2 for CA UE on downlink subframe 1 of Band2, sends uplink scheduling signaling of uplink subframe 7 of Band1 for non-CA UE 1 on downlink subframe 1 of Band1, and sends uplink scheduling signaling of uplink subframe 7 of Band2 for non-CA UE2 on downlink subframe 3 of Band 2.
Therefore, in the LTE-a TDD system, for all UEs that need to perform uplink data transmission in the subframe n, the transmission time of the uplink scheduling signaling may be different, and on the other hand, in the implementation process, due to the processing delay of the device and other reasons, the scheduling decision of the base station is performed in advance, and the delay is the same for all UEs, so that for UEs working in the same uplink subframe, if the uplink scheduling signaling is transmitted at different times, the time for the base station to start scheduling the same uplink subframe is also different.
For example, referring to fig. 6A, for uplink subframe 7, the base station transmits uplink scheduling signaling of uplink subframe 7 of Band2 on downlink subframe 1 of Band1 and downlink subframe 3 of Band2 for CA UE and non-CA UE, respectively, and assuming that the processing delay of the base station is three subframes, the timings at which the base station starts scheduling for CA UE and non-CA UE are subframe 8 of Band1 and subframe 0 of Band2, respectively, so that the timings at which the base station starts to perform modulation preparations for different UEs are different from each other. For example, as shown in fig. 6, for an uplink subframe 7, the base station transmits uplink scheduling signaling of an uplink subframe 7 of Band1 on a downlink subframe 1 of Band1 and uplink scheduling signaling of an uplink subframe 7 of Band2 on a downlink subframe 3 of Band2 for CA UEs aggregating carriers on Band1 and Band2, and assuming that the processing delay of the base station is three subframes, the timings at which the base station starts scheduling on Band1 and Band2 for CA UEs are subframe 8 of Band1 and subframe 0 of Band2, respectively, so that the timings at which the base station starts performing the same uplink subframe modulation on UEs are different from each other. Therefore, the existing scheduling mechanism, the implementation mode and efficiency of the scheduler, the transmission priority of the UE, the time-frequency resource allocation and the like are correspondingly influenced, so that the execution complexity of uplink scheduling is improved, the execution efficiency of the uplink scheduling is reduced, and the overall performance of the system is influenced.
Disclosure of Invention
The embodiment of the invention provides a method and a device for scheduling uplink data, which are used for reducing the complexity of uplink scheduling execution of a base station.
The embodiment of the invention provides the following specific technical scheme:
a method for scheduling uplink data comprises the following steps:
aiming at a plurality of UE which carry out data transmission on the same uplink subframe and transmit corresponding uplink scheduling signaling in different downlink subframes, determining the uplink scheduling signaling transmission time corresponding to each UE according to TDD uplink and downlink configuration corresponding to the uplink scheduling signaling received by the UE;
selecting a first sending time meeting a preset condition from the obtained sending times of each uplink scheduling signaling, and determining a scheduling starting time based on the first sending time;
and simultaneously starting to execute scheduling operation on the plurality of UEs at the scheduling starting time, and respectively sending uplink scheduling signaling for scheduling the same uplink subframe for data transmission to the corresponding UE at the uplink scheduling signaling sending time corresponding to each UE.
An uplink data scheduling apparatus, comprising:
a first determining unit, configured to determine, for multiple UEs that perform data transmission in the same uplink subframe and transmit corresponding uplink scheduling signaling in different downlink subframes, a transmission time of the uplink scheduling signaling corresponding to each UE according to TDD uplink and downlink configurations corresponding to the uplink scheduling signaling received by the UE;
a second determining unit, configured to select a first sending time meeting a preset condition from the obtained sending times of the uplink scheduling signaling, and determine a scheduling start time based on the first sending time;
and the main control unit is used for simultaneously executing scheduling operation on the plurality of UEs at the scheduling starting time, and respectively sending uplink scheduling signaling for scheduling data transmission on the same uplink subframe to the corresponding UE at the uplink scheduling signaling sending time corresponding to each UE.
In the embodiment of the invention, an uplink scheduling method is provided, when a base station is realized, for different uplink scheduling signaling sending time corresponding to each UE which carries out uplink data transmission in the same uplink subframe n, an earlier uplink scheduling signaling sending time is selected, a scheduling starting time is obtained by combining local processing time delay, and in the scheduling starting time, the base station simultaneously starts scheduling aiming at the same uplink subframe n for each UE, and then sends the uplink scheduling signaling of the uplink subframe n to each UE at the uplink signaling sending time corresponding to each UE, so that in Rel-11 and subsequent versions, even if different UEs respectively carry out the uplink data scheduling signaling sending according to different TDD uplink and downlink configurations, the corresponding uplink scheduling process can be kept consistent with the scheduling mode of the prior system, thereby reducing the execution complexity of the uplink scheduling in the LTE-A TDD system, and further, the resource allocation can be better carried out according to the channel condition, and the system performance is improved.
Drawings
Fig. 1 is a schematic diagram of carrier distribution of an LTE system in the prior art;
FIG. 2 is a schematic view of the CA technology downloading wave distribution of the LTE-A system in the prior art;
fig. 3 is a schematic diagram illustrating configurations of uplink and downlink subframes of different TDD used by different bands aggregated in an LTE-a system in the prior art;
fig. 4 is a schematic diagram of LTE system uplink scheduling in the prior art;
fig. 5A, fig. 5B, fig. 6A and fig. 6B are schematic diagrams of uplink scheduling of an LTE-a system in the prior art;
fig. 7 is a flowchart illustrating uplink scheduling performed by a base station in an embodiment of the present invention;
fig. 8 and fig. 9 are schematic diagrams of uplink scheduling time in the embodiment of the present invention;
fig. 10 and fig. 11 are schematic diagrams of uplink scheduling in the embodiment of the present invention;
fig. 12 is a functional structure diagram of a base station in an embodiment of the invention.
Detailed Description
In order to reduce the complexity of performing uplink scheduling of the base station, in the embodiment of the present invention, for a plurality of UEs performing uplink data transmission in the same uplink subframe n and transmitting corresponding uplink scheduling signaling in different downlink subframes, the base station may select a transmission time of an uplink scheduling signaling with an earlier time from transmission times of uplink scheduling signaling of the UEs, obtain a common time t at which scheduling starts in combination with a processing delay of a device, and then, a scheduling operation is simultaneously started for a plurality of UEs transmitting uplink data in the same uplink subframe n at time t, then, according to the TDD uplink and downlink configuration or/and TDD uplink and downlink reference configuration corresponding to the working carrier of each UE, and sending corresponding scheduling signaling to each UE at the corresponding scheduling time of each UE, thereby reducing the complexity of uplink scheduling and improving the system performance.
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
In an LTE-a TDD system, if a CA UE aggregates multiple carriers of different TDD uplink and downlink configurations, when a base station performs cross-carrier scheduling for the CA UE, a TDD uplink and downlink reference configuration corresponding to an uplink scheduling timing used on a certain carrier may be different from a TDD uplink and downlink configuration notified by system information on the carrier; meanwhile, when the base station performs the carrier scheduling for the CA UE, TDD uplink and downlink reference configurations corresponding to uplink scheduling timings respectively used on a plurality of carriers may be different. Then, referring to fig. 7, in the embodiment of the present invention, taking an example that a plurality of UEs all perform uplink data transmission in an uplink subframe n, a detailed procedure for a base station to perform uplink scheduling on each UE is described as follows:
step 700: aiming at a plurality of UE which carry out data transmission on an uplink subframe n and transmit corresponding uplink scheduling signaling on different downlink subframes, a base station determines the sending time of the uplink scheduling signaling corresponding to each UE according to TDD uplink and downlink configuration corresponding to the uplink scheduling signaling received by each UE.
In this embodiment, the UE adopted by the base station receives the TDD uplink/downlink configuration corresponding to the uplink scheduling signaling, which is the TDD uplink/downlink configuration notified by the system information; or, configuring a TDD uplink and downlink configured by a high-level signaling; or, the UE is configured for a TDD uplink and downlink configuration determined according to a predetermined rule (e.g., a TDD uplink and downlink reference configuration corresponding to the CA UE).
For example, for an uplink subframe n, the base station sends uplink scheduling signaling to the non-CA UE according to the TDD uplink and downlink configuration notified by the system information on the carrier M, e.g., sending the uplink scheduling signaling on the subframe n-k1, where the value of k1 is shown in table 2; meanwhile, the base station also sends the uplink scheduling signaling to the CA UE according to the TDD uplink and downlink configuration corresponding to the uplink scheduling signaling received by the CA UE on the carrier M, namely the uplink scheduling signaling is sent on the subframe n-k2, and the value of k2 is shown in the reference table 2; if the TDD uplink and downlink reference configuration corresponding to the carrier M is different from the TDD uplink and downlink configuration notified by the system information on the carrier M, then K1 ≠ K2; the value of k1 may be determined according to TDD uplink and downlink configuration and subframe index notified by the system information on the carrier M, and the value of k2 may be determined according to TDD uplink and downlink reference configuration and subframe index used by the CA UE on the carrier M, which are specifically described in the background, and will not be described herein again.
For another example, for an uplink subframe n, the base station receives TDD uplink and downlink configurations corresponding to uplink scheduling signaling on different carriers according to the same CA UE, and sends the uplink scheduling signaling on different carriers to the CA UE, for example, sending the uplink scheduling signaling on subframe n-k1 of carrier 1 and sending the uplink scheduling signaling on subframe n-k2 of carrier 2, where the values of k1 and k2 are shown in table 2; if the CA UE receives uplink scheduling signaling on different carriers according to different TDD uplink and downlink configurations, respectively, K1 is not equal to K2; the values of k1 and k2 may be determined according to TDD uplink and downlink configurations and subframe index numbers corresponding to uplink scheduling signaling received by the CA UE on different carriers, which is specifically referred to related descriptions in the background art and will not be described herein again.
Another example is: for an uplink subframe n, a base station receives TDD uplink and downlink configurations corresponding to uplink scheduling signaling on a plurality of carriers according to different UEs (including CA UE and non-CA UE), respectively transmits the uplink scheduling signaling on the corresponding carriers for each UE, namely transmits the uplink scheduling signaling to the CA UE in a subframe n-k1 of a carrier 1, transmits the uplink scheduling signaling to the CA UE in a subframe n-k1 of a carrier 2, transmits the uplink scheduling signaling to the non-CA UE in a subframe n-k3 of the carrier 1, and transmits the uplink scheduling signaling to the non-CA UE in a subframe n-k4 of the carrier 2, wherein values of k1, k2, k3 and k4 are determined according to the TDD uplink and downlink configurations and subframe index numbers corresponding to the uplink scheduling signaling received by the CA UE on different carriers, specific reference is made to the related description in the background art, and details are not repeated herein.
Step 710: and the base station selects a first sending time meeting a preset condition from the obtained sending times of the uplink scheduling signaling, and determines a scheduling starting time based on the first sending time.
In this embodiment, preferably, among the obtained transmission timings of the uplink scheduling signaling, the earliest transmission timing may be determined as the first transmission timing, and then, the base station may determine the scheduling start timing based on the first transmission timing, specifically: and enabling the interval duration between the scheduling starting time and the first sending time to be not less than the local processing delay.
For example, assuming that the sending time of the uplink scheduling signaling of the CA UE performing uplink data transmission using the uplink subframe n is subframe n-k1, and the sending time of the uplink scheduling signaling of the non-CA UE performing uplink data transmission using the uplink subframe n is subframe n-k2, referring to fig. 8 and 9, the base station performs scheduling on the uplink subframe n at Timing1 stage, where the starting time of Timing1 may be determined according to the TDD uplink and downlink configuration, the TDD uplink and downlink reference configuration, the subframe index number and the device processing delay of the base station actually used by the carrier M, specifically: firstly, comparing the sizes of k1 and k2, taking a larger value, and then obtaining a subframe n-s at the starting time of scheduling by the base station according to the device processing delay T of the base station, wherein the specific value of s can be flexibly determined according to the specific implementation mode of the base station, but at least s is required to be more than or equal to max (k1, k2) + T, the base station simultaneously starts an uplink scheduling process for all CA UE and non-CA UE which need to perform uplink data transmission on the subframe n in the subframe n-s, and finishes the process in a Timing1 stage, wherein the Timing1 is more than or equal to T.
Step 720: and the base station simultaneously starts to execute scheduling operation on a plurality of UE which use the uplink subframe n for uplink data transmission at the scheduling starting time, and respectively sends uplink scheduling signaling for scheduling data transmission on the uplink subframe n to the corresponding UE at the uplink scheduling signaling sending time corresponding to each UE.
Referring to fig. 8 and 9, in two application scenarios of k1 > k2 and k1 < k2, the base station performs uplink subframe n scheduling signaling for non-CAUE and CAUE in a specific subframe n-k1 and a specific subframe n-k2 of a Timing2 stage, where Timing2 ═ max (k1, k 2).
Based on the above embodiments, the following takes two application scenarios of k1 > k2 and k1 < k2 as examples, and the specific implementation of the above embodiments is described in detail.
In a first application scenario, k1 is greater than k2, as shown in fig. 8, the base station simultaneously starts uplink scheduling for all CA UEs and non-CA UEs that need to perform uplink data transmission in the subframe n-s, after completing the scheduling process in the Timing1 stage, the base station sends uplink scheduling signaling of the subframe n to the non-CA UEs in the subframe n-k1 in the Timing2 stage, and sends uplink scheduling signaling of the subframe n to the CA UEs in the subframe n-k 2.
For example, referring to fig. 10, carrier 1 operating on band1 uses TDD uplink and downlink configuration 2, carrier 2 operating on band2 uses TDD uplink and downlink configuration 1, and for CA UE simultaneously operating on these two carriers, if carrier 1 is used as a main carrier, then when performing cross-carrier scheduling, the TDD uplink and downlink reference configuration of the CA UE on carrier 2 is TDD uplink and downlink configuration 2, that is, the base station transmits uplink scheduling signaling according to the scheduling timing of TDD uplink and downlink configuration 2 on carrier 2 for the case, and for non-CA UE operating on carrier 2 alone, still transmits scheduling signaling according to the scheduling timing of TDD uplink and downlink configuration 1. Assuming that the device processing delay of the base station includes a duration of three subframes, for the uplink subframe 7 on the carrier 2, the time when the base station sends the uplink scheduling signaling to the non-CAUE is earlier than the time when the base station sends the uplink scheduling signaling to the CA UE, so the starting time of the Timing1 stage is three subframes before the time when the base station sends the uplink scheduling signaling to the non-CAUE, that is, the base station needs to start uplink scheduling for the uplink subframe 7 to the CA UE and the non-CA UE working on the carrier 2 at the same time at the subframe 8 or earlier, and the method includes processes of PUSCH resource allocation and MCS determination for the uplink subframe 7. After the scheduling process for the uplink subframe 7 is completed in the Timing1 stage, in the Timing2 stage, the base station sends the uplink scheduling signaling of the uplink subframe 7 to the CA UE on the downlink subframe 3 in the carrier 1, and sends the uplink scheduling signaling of the uplink subframe 7 to the non-CA UE on the downlink subframe 1 in the carrier 2.
In a second application scenario, k1 is less than k2, as shown in fig. 9, the base station simultaneously starts uplink scheduling for all CA UEs and non-CA UEs that need to perform uplink data transmission in the subframe n-s, and after completing the scheduling process in the Timing1 stage, the base station sends uplink scheduling signaling of the subframe n to the CA UEs in the subframe n-k2 in the Timing2 stage, and sends uplink scheduling signaling of the subframe n to the non-CA UEs in the subframe n-k 1.
For example, referring to fig. 11, carrier 1 operating on band1 uses TDD uplink and downlink configuration 1, carrier 2 operating on band2 uses TDD uplink and downlink configuration 2, and for CA UE simultaneously operating on these two carriers, if carrier 1 is used as a main carrier, then when performing cross-carrier scheduling, the TDD uplink and downlink reference configuration of the CA-UE on carrier 2 is TDD uplink and downlink configuration 1, that is, the base station transmits uplink scheduling signaling according to the scheduling timing of TDD uplink and downlink configuration 1 on carrier 2 for CA UE, and for non-CA UE operating alone on carrier 2, the base station still transmits uplink scheduling signaling according to the scheduling timing of TDD uplink and downlink configuration 2. Assuming that the device processing delay of the base station comprises the duration of three subframes, then, for the uplink subframe 7 on the carrier 2, the time when the base station transmits the uplink scheduling signaling to the CAUE is earlier than the time when the base station transmits the uplink scheduling signaling to the non-CA UE, therefore, the starting time of Timing1 stage is three sub-frames before the time when the base station transmits the uplink scheduling signaling to the CA UE, that is, the base station should start uplink scheduling for uplink subframe 7 at subframe 8 or earlier for CA UE and non-CA UE operating on carrier 2, including PUSCH resource allocation and MCS determination for uplink subframe 7, after finishing the scheduling process for the uplink subframe 7 in the Timing1 stage, in the Timing2 stage, the base station sends the uplink scheduling signaling of the uplink subframe 7 to the CA UE on the downlink subframe 1 in the carrier 1, and sending uplink scheduling signaling of an uplink subframe 7 to the non-CAUE on a downlink subframe 3 in the carrier 2.
Of course, the first application scenario and the second application scenario are only described by taking non-CA UE and CA UE as examples. In practical applications, the technical solutions provided by the above embodiments are also applicable to an application scenario in which the CA UE receives uplink scheduling signaling using different TDD uplink and downlink configurations on different carriers (e.g., the CA UE receives uplink scheduling signaling sent by the base station on the subframe n-k1 of the carrier 1, and receives uplink scheduling signaling sent by the base station on the subframe n-k2 of the carrier 2), and an application scenario in which multiple UEs receive uplink scheduling signaling using different TDD uplink and downlink configurations on different carriers (e.g., the CA UE receives uplink scheduling signaling sent by the base station on the subframe n-k1 of the carrier 1 and the subframe n-k2 of the carrier 2, the non-CA UE 1 receives uplink scheduling signaling sent by the base station on the subframe n-k3 of the carrier 1, and the non-CA UE2 receives uplink scheduling signaling sent by the base station on the subframe n-k4 of the carrier 2), and will not be described in detail herein.
Based on the above embodiment, referring to fig. 12, in the embodiment of the present invention, the base station includes a first determining unit 120, a second determining unit 121, and a main control unit 122, wherein,
a first determining unit 120, configured to determine, for multiple UEs that perform data transmission in the same uplink subframe and transmit corresponding uplink scheduling signaling in different downlink subframes, a sending time of the uplink scheduling signaling corresponding to each UE according to TDD uplink and downlink configurations corresponding to the uplink scheduling signaling received by each UE;
a second determining unit 121, configured to select a first sending time meeting a preset condition from the obtained sending times of each uplink scheduling signaling, and determine a scheduling start time based on the first sending time;
the main control unit 122 is configured to perform a scheduling operation at a scheduling start time, and send an uplink scheduling signaling for scheduling data transmission on the same uplink subframe to the corresponding UE at an uplink scheduling signaling sending time corresponding to each UE.
To sum up, under the prior art, the present invention provides an uplink scheduling method, when a base station is implemented, selecting an earlier uplink scheduling signaling transmission time from uplink scheduling signaling transmission times corresponding to UEs performing uplink data transmission in the same uplink subframe n, obtaining a scheduling start time by combining local processing delay, and simultaneously starting scheduling operations for all UEs performing uplink data transmission in the same uplink subframe n at the scheduling start time, and then transmitting uplink scheduling signaling of the uplink subframe n to the UEs at the uplink signaling transmission time corresponding to each UE, so that in Rel-11 and subsequent versions, even if the UEs performing uplink data transmission in the same uplink subframe n perform uplink data scheduling signaling transmission with reference to different uplink and downlink configurations, their corresponding uplink scheduling processes can be kept consistent with the scheduling mode of the existing system, therefore, the complexity of executing the uplink scheduling in the LTE-A TDD system is reduced, the resource allocation can be better carried out according to the channel condition, and the system performance is improved.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (6)
1. A method for scheduling uplink data, comprising:
aiming at a plurality of terminal UE which carry out data transmission on the same uplink subframe and transmit corresponding uplink scheduling signaling in different downlink subframes, determining the uplink scheduling signaling transmission time corresponding to each UE according to the TDD uplink and downlink configuration corresponding to the uplink scheduling signaling received by the UE;
determining the earliest transmission time among the obtained transmission times of the uplink scheduling signaling as a first transmission time, and determining a scheduling starting time based on the first transmission time;
and simultaneously starting to execute scheduling operation on the plurality of UEs at the scheduling starting time, and respectively sending uplink scheduling signaling for scheduling the same uplink subframe for data transmission to the corresponding UE at the uplink scheduling signaling sending time corresponding to each UE.
2. The method of claim 1, wherein the UE receives the TDD uplink/downlink configuration corresponding to the uplink scheduling signaling, which is the TDD uplink/downlink configuration notified by the system information; or, configuring a TDD uplink and downlink configured by a high-level signaling; or, configuring a TDD uplink and downlink determined according to a predetermined rule.
3. The method of claim 1, wherein the selecting a first sending time meeting a preset condition from the obtained sending times of the uplink scheduling signaling, and determining a scheduling start time based on the first sending time comprises:
selecting a first sending time which meets a preset condition aiming at uplink scheduling signaling sending times corresponding to different UE (user equipment) on the same carrier, and determining a scheduling starting time corresponding to an uplink subframe on the carrier based on the first sending time; or,
selecting a first sending time which meets a preset condition aiming at uplink scheduling signaling sending times which respectively correspond to the same UE on a plurality of carriers, and determining scheduling starting times corresponding to uplink subframes on the plurality of carriers based on the first sending time; or,
selecting a first sending time which meets a preset condition aiming at uplink scheduling signaling sending times respectively corresponding to different UE on a plurality of carriers, and determining scheduling starting times corresponding to uplink subframes on the plurality of carriers based on the first sending time;
and enabling the interval duration between the scheduling starting time and the first sending time to be not less than the local processing delay.
4. An apparatus for scheduling uplink data, comprising:
a first determining unit, configured to determine, for multiple terminal UEs that perform data transmission in the same uplink subframe and transmit corresponding uplink scheduling signaling in different downlink subframes, a time division duplex TDD uplink and downlink configuration corresponding to the uplink scheduling signaling received by the UE, and a time at which the uplink scheduling signaling corresponding to each UE is sent;
a second determining unit, configured to determine, as a first transmission time, a transmission time with the earliest time among transmission times of the obtained uplink scheduling signaling, and determine a scheduling start time based on the first transmission time;
and the main control unit is used for simultaneously executing scheduling operation on the plurality of UEs at the scheduling starting time, and respectively sending uplink scheduling signaling for scheduling data transmission on the same uplink subframe to the corresponding UE at the uplink scheduling signaling sending time corresponding to each UE.
5. The apparatus according to claim 4, wherein each UE used by the first determining unit receives the TDD uplink/downlink configuration corresponding to the uplink scheduling signaling and is notified by the system information; or, configuring a TDD uplink and downlink configured by a high-level signaling; or, configuring a TDD uplink and downlink determined according to a predetermined rule.
6. The apparatus of claim 4, wherein the second determining unit selects a first sending time meeting a preset condition from the obtained sending times of the uplink scheduling signaling, and determines the scheduling start time based on the first sending time, and the method includes:
selecting a first sending time which meets a preset condition aiming at uplink scheduling signaling sending times corresponding to different UE (user equipment) on the same carrier, and determining a scheduling starting time corresponding to an uplink subframe on the carrier based on the first sending time; or,
selecting a first sending time meeting a preset condition aiming at uplink scheduling signaling sending times respectively corresponding to the same UE on a plurality of carriers, and determining scheduling starting times corresponding to uplink subframes on the plurality of carriers based on the first sending time; or,
selecting a first sending time which meets a preset condition aiming at uplink scheduling signaling sending times respectively corresponding to different UE on a plurality of carriers, and determining scheduling starting times corresponding to uplink subframes on the plurality of carriers based on the first sending time;
and enabling the interval duration between the scheduling starting time and the first sending time to be not less than the local processing delay.
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| CN105991274B (en) * | 2015-03-03 | 2019-05-21 | 电信科学技术研究院 | Method, feedback information transmission method and the relevant device of data transmission |
| CN106413106B (en) | 2015-07-28 | 2019-09-17 | 电信科学技术研究院 | A kind of transmission method and device of upstream data |
| US10285170B2 (en) * | 2016-01-19 | 2019-05-07 | Samsung Electronics Co., Ltd. | Method and apparatus for frame structure for advanced communication systems |
| WO2018010143A1 (en) | 2016-07-14 | 2018-01-18 | 广东欧珀移动通信有限公司 | Communication method, base station and user equipment |
| CN107872860B (en) * | 2016-09-27 | 2020-09-11 | 中国移动通信有限公司研究院 | Uplink signal transmission method, device and system |
| CN112865946B (en) | 2017-11-10 | 2022-07-15 | 中兴通讯股份有限公司 | Wireless communication method and device |
| CN110248415B (en) * | 2018-03-09 | 2021-06-08 | 华为技术有限公司 | Time slot format indication method, equipment and system |
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