A method for uplink pre-scheduling in wireless communication

Abstract

The present invention relates to a method for uplink pre-scheduling in wireless communication, belonging to the technical field of wireless communication systems. The base station determines that the user terminal meets the uplink pre-scheduling conditions; generates an uplink grant MAC CE; and multiplexes the uplink grant MAC CE and downlink data together in a downlink TB for transmission to the user terminal. It saves one downlink control channel resource, multiplexes through the data channel, improves the overall resource utilization efficiency, simplifies the pre-scheduling process, and reduces the probability of errors.

Description

Technical Field

[0001] The present invention belongs to the technical field of wireless communication systems, and particularly relates to a method for uplink pre-scheduling in wireless communication. Background Art

[0002] In a wireless communication system, the transmission of uplink data or signaling of a UE (User Equipment) requires the base station to perform uplink authorization to ensure that the resources used by each UE do not conflict; and the base station performs uplink authorization for the UE, mainly including the following categories: The first category is the uplink authorization defined in the protocol. The second category is the uplink authorization not explicitly defined in the protocol, which is the manufacturer-customized uplink pre-authorization, generally also called pre-scheduling, that is, when the base station does not receive a clear authorization request from the UE, it makes a judgment based on the communication context with the UE and whether to actively initiate uplink authorization for the UE to achieve the effect of reducing the interaction process and delay.

[0003] Existing pre-authorization schemes all require the base station to send uplink scheduling control information to the UE on the downlink control channel, that is, an additional downlink control channel resource needs to be occupied. After the UE decodes the uplink scheduling control information on the downlink control channel, it will initiate the transmission of uplink data.

[0004] For example, a method for sending uplink authorization information and a base station with the patent number CN105451345A propose a method for calculating uplink pre-authorization information based on downlink services, but this scheme does not change the notification method of uplink authorization and still requires consuming a downlink control channel resource during authorization. Summary of the Invention

[0005] In order to solve the problem that pre-scheduling uplink authorization in the prior art requires an additional consumption of a downlink control channel resource, the present invention proposes a method for uplink pre-scheduling in wireless communication.

[0006] A method for uplink pre-scheduling in wireless communication includes a base station for generating an uplink authorization MAC CE for a user terminal that meets the uplink pre-scheduling condition; multiplexing the uplink authorization MAC CE and downlink data in a downlink TB and transmitting them to the user terminal; and the user terminal receiving and decoding the uplink authorization MAC CE and downlink data transmitted by the base station.

[0007] Further, the base station calculates the downlink rate of the user terminal, obtains the service type of the user terminal, and performs pre-scheduling according to the pre-scheduling period and size configured according to the service type.

[0008] Further, the method for the base station to perform pre-scheduling includes: assuming that a certain moment of downlink scheduling is t1, the nearest uplink pre-scheduling TTI from the moment t1 is calculated by the pre-scheduling period as t2, and Δt is obtained by t2 - t1. The set of intervals for the downlink PDCCH to schedule the PUSCH configured by the system is {k2′, k2″, k2″′...}; when Δt ∈ {k2′, k2″, k2″′...}, it indicates that the PUSCH at the moment t2 can be scheduled at the moment t1. Then, the uplink DCI is placed in the uplink grant MAC CE and sent to the user terminal together with the downlink data.

[0009] Further, during the process of the base station transmitting the downlink TB, at most 2 TBs or at most 1 TB are sent within one TTI.

[0010] Further, the Then, the self-learning configuration of k2 is achieved through newly added parameters, or the traditional PDCCH resources are used for uplink authorization in the corresponding pre-scheduling TTI.

[0011] Further, the newly added parameters include a pre-scheduling k2 self-learning switch and a pre-scheduling k2 self-learning threshold.

[0012] Further, the steps for the self-learning configuration of k2 are as follows:

[0013] S1. During the pre-scheduling process, if the pre-scheduling k2 self-learning switch is turned on, the base station accumulatively statistics the situations according to different Δt.

[0014] S2. When the accumulative statistics for a certain Δt are greater than the "pre-scheduling k2 self-learning threshold" and the value of this Δt falls within the range of k2 values supported by the protocol, the base station system adds the corresponding k2 table entry.

[0015] S3. The base station can use this k2 table entry for configuration and scheduling for the subsequently accessed UEs.

[0016] Further, the uplink grant MAC CE includes frequency domain and time domain information.

[0017] Further, the uplink grant MAC CE is composed of a MAC header and a UL GRANT MAC CE, and the payload of the uplink grant MAC CE is DCL scheduling information.

[0018] Further, when the UL GRANT MAC CE is multiplexed with other MAC CEs and MAC SDUs, it is consistent with the multiplexing scheme of the 3GPP standard.

[0019] Beneficial effects:

[0020] In the present invention, by adding a new MAC CE for user uplink authorization, when a certain UE meets the uplink pre-scheduling condition, an uplink authorization MAC CE is generated, and this MAC CE and the downlink data to be transmitted are multiplexed in a downlink TB and transmitted to the UE. The advantages of the present invention compared with the prior art are as follows: it saves a portion of downlink control channel resources, improves the overall resource utilization efficiency through multiplexing on the data channel, simplifies the pre-scheduling process, and reduces the probability of errors. Especially in the uplink pre-scheduling process triggered by the downlink SRB / DRB, when using this scheme, if the UE can decode the downlink data, it can obtain the uplink pre-scheduling information and complete the pre-scheduling; if the UE cannot decode the downlink data, then this pre-scheduling fails, and the downlink control channel resources for scheduling the uplink are not wasted. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a flowchart of a method for uplink pre-scheduling in wireless communication proposed by the present invention;

[0022] Figure 2 is a MAC CE structure diagram of a method for uplink pre-scheduling in wireless communication proposed by the present invention;

[0023] Figure 3 is a schematic diagram of DCI scheduling information of a method for uplink pre-scheduling in wireless communication proposed by the present invention;

[0024] Figure 4 is a multiplexing example diagram of UL GRANT MAC CE of a method for uplink pre-scheduling in wireless communication proposed by the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be described below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0026] Referring to Figure 1 , in a wireless communication system, the pre-scheduling scheme is to send uplink scheduling control information to the UE through the downlink control channel of the base station, and the UE is the user terminal. This method requires an additional portion of downlink control channel resources during the transmission process. This method is to generate a new user uplink authorization MAC CE under the condition of meeting the uplink pre-scheduling, and through the uplink authorization MAC CE, this uplink authorization MAC CE and the downlink data to be transmitted are multiplexed in a downlink TB and transmitted to. The UE obtains the uplink authorization and data information by decoding, saving the downlink control channel resources.

[0027] When the base station finds that it needs to send downlink data to a certain UE, the base station performs pre-scheduling calculations according to the enabled pre-scheduling algorithm. And it determines the downlink data type of the base station as SRB or TCP service by calculating the downlink rate of the UE. After determining the service type, it performs pre-scheduling authorization according to the configured pre-scheduling period and size.

[0028] The uplink pre-scheduling method adopted in the present invention is as follows: Assume that a certain moment of the current downlink scheduling is t1. The nearest uplink pre-scheduling TTI to the moment t1 is calculated by the pre-scheduling period as t2. Δt is obtained by t2 - t1. The set of intervals for the downlink PDCCH to schedule the PUSCH configured in the system is {k2′, k2″, k2″′...}. The standard name of the interval for the downlink PDCCH to schedule the PUSCH in the protocol is k2. When Δt ∈ {k2′, k2″, k2″′...}, it indicates that the PUSCH at the moment t2 can be scheduled at the moment t1. Then the uplink DCI is placed in the uplink authorization MACCE and sent to the user terminal together with the downlink data. Otherwise, traditional PDCCH resources are used for uplink authorization in the corresponding pre-scheduling TTI.

[0029] The data sent from the MAC layer to the physical layer is organized in the form of a transport block (TB). One TB corresponds to a data block containing a MAC PDU. This data block will be sent within a TTI and is also the unit of HARQ retransmission. In the present invention, at most 2 TBs are sent within one TTI, which is configured according to actual requirements and is not limited in the present invention.

[0030] In this embodiment, a pre-scheduling method is also proposed, which uses new parameters to realize the self-learning configuration of k2.

[0031] The new parameters include a pre-scheduling k2 self-learning switch and a pre-scheduling k2 self-learning threshold. The steps for the self-learning configuration of k2 are as follows:

[0032] S1. During the pre-scheduling process, if the pre-scheduling k2 self-learning switch is turned on, the base station accumulatively statistics the situation according to different Δt values.

[0033] S2. When the cumulative statistics for a certain Δt are greater than the "pre-scheduling k2 self-learning threshold" and the value of this Δt falls within the range of k2 values supported by the protocol, the base station system adds the corresponding k2 entry.

[0034] S3. The base station can use the automatically generated k2 entry for configuration and scheduling for the subsequently accessed UEs.

[0035] The user terminal sends uplink data according to the obtained authorized time domain and frequency domain information.

[0036] Referring to Figure 2 、 Figure 3 , the uplink grant MAC CE consists of a MAC and a UL GRANT MAC CE, and the payload of the MAC CE is DCL scheduling information. Referring to Figure 4 , the UL GRANT MAC CE and the MAC CE are multiplexed using the 3GPP standard. The MAC PDU in the UE random access response consists of one or more MAC subPDUs and padding. Except for the fixed-size MAC CE, padding, and MAC SDU containing the UL CCCH, the MAC subheader consists of four header fields R / F / LCID / L. For the fixed-size MAC CE, padding, and MAC SDU containing the UL CCCH, the SDU consists of two header fields R / LCID. The MAC SDU has different sizes, and the MAC subheader corresponds to the MAC SDU, MAC CE, or padding. Each MAC entity can transmit at most one MAC PDU per TB.

[0037] When the UE meets the uplink pre-scheduling condition, the present invention saves downlink control channel resources and simplifies the pre-scheduling process by adding a new type of uplink grant MAC CE and multiplexing the uplink grant MAC CE and downlink data together for transmission to the UE.

Claims

1. A method for uplink pre-scheduling in wireless communication, characterized in that, it includes, a base station, configured to generate an uplink grant MAC CE for a user terminal that meets the uplink pre-scheduling condition; multiplex the uplink grant MAC CE and downlink data together in a downlink TB and transmit them to the user terminal; the base station obtains the service type of the user terminal by calculating the downlink rate of the user terminal, and performs pre-scheduling according to the pre-scheduling period and size configured for the service type; The method for the base station to perform pre-scheduling includes: assuming that a certain moment of downlink scheduling is t1, the nearest uplink pre-scheduling TTI to the moment t1 is calculated from the pre-scheduling period as t2, Δt is obtained by t2 - t1, and t2 is the uplink pre-scheduling moment; the set of intervals for the system-configured downlink PDCCH to schedule PUSCH is ; when , it indicates that the PUSCH at the moment t2 can be scheduled at the moment t1, then the uplink DCI is placed in the uplink grant MAC CE and sent to the user terminal together with the downlink data; The , the self-learning configuration of k2 is realized by adding new parameters; the new parameters include the pre-scheduling k2 self-learning switch and the pre-scheduling k2 self-learning threshold; the steps of the self-learning configuration of k2 are as follows: S1. During the pre-scheduling process, if the pre-scheduling k2 self-learning switch is turned on , the base station accumulatively statistics the situation of according to different Δt; S2. When the cumulative statistics for a certain Δt are greater than the "pre-scheduling k2 self-learning threshold", and the value of this Δt falls within the range of k2 values supported by the protocol, the base station system adds the corresponding k2 entry; S3. The base station can use this k2 entry for configuration and scheduling for subsequent accessed UEs; a user terminal, configured to receive and decode the uplink grant MAC CE and downlink data transmitted by the base station.

2. The method for uplink pre-scheduling in wireless communication according to claim 1, characterized in that, during the process of the base station transmitting the downlink TB, at most 2 TBs are transmitted within one TTI.

3. The method for uplink pre-scheduling in wireless communication according to claim 1, characterized in that, the uplink grant MAC CE includes frequency domain and time domain information.

4. The method for uplink pre-scheduling in wireless communication according to claim 1, characterized in that, the uplink grant MAC CE is composed of a MAC header and a UL GRANT MAC CE, and the payload of the uplink grant MAC CE is DCI scheduling information.

5. The method for uplink pre-scheduling in wireless communication according to claim 4, characterized in that, the UL GRANT MAC CE is multiplexed with other MAC CEs and MAC SDUs.

Images