CN115002927A

CN115002927A - Method for uplink pre-scheduling in wireless communication

Info

Publication number: CN115002927A
Application number: CN202210835304.4A
Authority: CN
Inventors: 罗煌
Original assignee: Sichuan Innogence Technology Co Ltd
Current assignee: Sichuan Innogence Technology Co Ltd
Priority date: 2022-07-15
Filing date: 2022-07-15
Publication date: 2022-09-02

Abstract

The invention relates to a method for uplink pre-scheduling in wireless communication, belonging to the technical field of wireless communication systems. The base station judges that the user terminal meets the uplink pre-scheduling condition; generating an uplink authorization MACCE; multiplexing the uplink authorization MACCE and the downlink data in a downlink TB together and transmitting the data to the user terminal. A downlink control channel resource is saved, multiplexing is carried out through a data channel, the overall resource utilization efficiency is improved, the pre-scheduling process is simplified, and the error probability is reduced.

Description

Method for uplink prescheduling in wireless communication

Technical Field

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

Background

In a wireless communication system, uplink data or signaling of UE (user equipment) needs to be sent by a base station for uplink authorization so as to ensure that resources used by each UE do not conflict; the base station performs uplink authorization for the UE, which mainly includes the following categories: the first type is an uplink grant defined in the protocol. The second type is uplink authorization which is not clearly defined in the protocol, uplink pre-authorization which is realized by self-defining of manufacturers is generally called pre-scheduling, namely when the base station does not receive an authorization request which is clearly defined by the UE, the base station performs pre-judgment according to the context of communication with the UE, whether the uplink authorization is actively initiated to the UE or not, and the effect of reducing the interaction process and the time delay is achieved.

In the existing pre-authorization schemes, a base station needs to send uplink scheduling control information to a UE on a downlink control channel, that is, one more downlink control channel resource needs to be occupied, and the UE will initiate sending of uplink data after solving the uplink scheduling control information on the downlink control channel.

For example, a method for sending uplink grant information and a method for calculating uplink pre-grant information based on downlink service are proposed in a base station and an uplink grant sending method with patent number CN105451345A, but the scheme does not change the notification manner of uplink grant, and still needs to consume a portion of downlink control channel resources during grant.

Disclosure of Invention

The invention provides an uplink pre-scheduling method in wireless communication, aiming at solving the problem that the pre-scheduling uplink authorization needs to consume an extra amount of downlink control channel resources in the prior art.

A method for uplink pre-scheduling in wireless communication comprises a base station, a base station and a base station, wherein the base station is used for generating uplink authorization MAC CE for user terminals meeting uplink pre-scheduling conditions; multiplexing the uplink authorization MAC CE and the downlink data in a downlink TB together to transmit the uplink authorization MAC CE and the downlink data to the user terminal; and the user terminal receives and decodes the uplink authorization MAC CE and the downlink data transmitted by the base station.

Further, 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 the pre-scheduling size configured by the service type.

Further, the method for the base station to perform prescheduling includes: assuming that a certain time of downlink scheduling is t1, calculating the uplink pre-scheduling TTI which is the latest time from the time of t1 to be t2 according to the pre-scheduling period, and obtaining delta t from t2-t1, wherein the interval set of the downlink PDCCH scheduling PUSCH configured by the system is { k2 ', k2 ', k2 ' … … }; when Δ t ∈ { k2 ', k2 ", k2 ' ″ ' … … }, it indicates that PUSCH at time t2 can be scheduled at time t1, and the uplink DCI is placed in the uplink grant MAC CE and transmitted to the user terminal together with the downlink data.

Further, in the process of transmitting downlink TBs by the base station, at most 2 TBs or at most 1 TB is transmitted within one TTI.

Further, the

Then the self-learning configuration of k2 is realized by adding new parameters or the uplink authorization is performed by using the traditional PDCCH resource in the corresponding prescheduled TTI.

Further, the new parameters comprise a pre-scheduling k2 self-learning switch and a pre-scheduling k2 self-learning threshold.

Further, the self-learning configuration step of k2 is as follows:

s1, in the pre-scheduling process, if

Turn on pre-schedule k2 self-learning switch, base station pair

The condition of (2) is accumulated and counted according to different delta t;

s2, when the accumulated statistics aiming at a certain delta t is larger than the self-learning threshold of the pre-scheduling k2 and the value of the delta t is in the range of the k2 value supported by the protocol, adding a corresponding k2 table entry by the base station system;

s3, the base station can use the k2 table item for configuration and scheduling for the UE which is accessed subsequently.

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

Further, the uplink grant MAC CE consists of a MAC header and UL GRANT MAC CE, and a payload of the uplink grant MAC CE is DCL scheduling information.

Further, the multiplexing of UL GRANT MAC CE and other MAC CEs and MAC SDUs is consistent with the multiplexing scheme of the 3GPP standard.

Has the advantages that:

the invention adds a user uplink authorized MAC CE, when a certain UE meets the uplink pre-scheduling condition, generates the uplink authorized MAC CE, multiplexes the MAC CE and the downlink data to be sent in a downlink TB and transmits the MAC CE and the downlink data to the UE. Compared with the prior art, the invention has the advantages that: a part of downlink control channel resources are saved, multiplexing is carried out through a data channel, the overall resource utilization efficiency is improved, the pre-scheduling process is simplified, and the error probability is reduced. Especially in the uplink pre-scheduling process triggered by the downlink SRB/DRB, by using the scheme, if the UE can solve the downlink data, the uplink pre-scheduling information can be acquired and the pre-scheduling is completed; if the UE cannot solve the downlink data, the pre-scheduling fails, and the uplink downlink control channel resource is not wasted.

Drawings

Fig. 1 is a flowchart of a method for uplink pre-scheduling in wireless communication according to the present invention;

fig. 2 is a diagram of an MAC CE structure of a method for uplink pre-scheduling in wireless communication according to the present invention;

fig. 3 is a schematic diagram of DCI scheduling information of a method for uplink pre-scheduling in wireless communication according to the present invention;

fig. 4 is a diagram of an UL GRANT MAC CE multiplexing example of a method for uplink pre-scheduling in wireless communication according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1, in a wireless communication system, a pre-scheduling scheme is to send uplink scheduling control information to a UE through a downlink control channel of a base station, where the UE is a user terminal. This method needs to occupy one more downlink control channel resource during the transmission process. The method comprises the steps of generating a new user uplink authorization MAC CE under the condition of meeting uplink pre-scheduling, and multiplexing the uplink authorization MAC CE and downlink data to be sent in a downlink TB for transmission through the uplink authorization MAC CE. The UE obtains the uplink authorization and the data information through decoding, and downlink control channel resources are saved.

When the base station finds that downlink data needs to be sent to a certain UE, the base station carries out pre-scheduling calculation according to the started pre-scheduling algorithm. And determining the downlink data type of the base station as SRB or TCP service by calculating the downlink rate of the UE, and performing pre-scheduling authorization according to the configured pre-scheduling period and size after determining the service type.

The uplink pre-scheduling method adopted by the invention comprises the following steps: supposing that a certain time of the downlink scheduling is t1, calculating the uplink pre-scheduling TTI which is the latest time from t1 to t2 according to the pre-scheduling period, wherein the t2-t1 obtains Δ t, the interval set of the downlink PDCCH (physical Downlink control channel) scheduling PUSCH configured by the system is { k2 ', k2 ', k2 ' … … }, and the standard name of the interval of the downlink PDCCH scheduling PUSCH in the protocol is k 2; when Δ t belongs to { k2 ', k2 ', k2 ' … … }, it indicates that PUSCH at time t2 can be scheduled at time t1, and uplink DCI is placed in uplink grant MACCE and transmitted to the user terminal together with downlink data. Otherwise, the traditional PDCCH resource is adopted to carry out uplink authorization in the corresponding prescheduled TTI.

Data sent from the MAC layer to the physical layer is organized in the form of Transport Blocks (TBs). One TB corresponds to a data block containing one mac pdu, and this data block is transmitted in one TTI and is also a unit of HARQ retransmission. In the invention, at most 2 TBs are transmitted in one TTI, and the configuration is carried out according to the actual requirement, which is not limited in the invention.

In the embodiment, the invention also provides a method for manufacturing the same

The pre-scheduling method adopts newly added parameters to realize the self-learning configuration of k 2.

The newly added parameters comprise a pre-scheduling k2 self-learning switch and a pre-scheduling k2 self-learning threshold. The self-learning configuration steps of k2 are as follows:

s1, in the pre-scheduling process, if

Open prescheduling k2 self-learning switch, base station pair

The condition of (2) is accumulated and counted according to different delta t;

s3, the base station can use the automatically generated k2 table item for configuration and scheduling for the UE with subsequent access.

And the user terminal transmits the uplink data according to the authorized time domain and frequency domain information.

Referring to fig. 2 and 3, the uplink grant MACCE is composed of MAC and UL GRANT MAC CE, and a payload of the MACCE is DCL scheduling information. Referring to fig. 4, the multiplexing between UL GRANT MAC CE and MAC CE adopts 3GPP standard. The MAC PDU of the random access response at the UE consists of one or more MAC sub-PDUs and padding. The MAC subheader consists of four header fields R/F/LCID/L, except for a fixed-size MAC CE, padding, and a MAC SDU containing UL CCCH. For fixed size MAC CE, padding and MAC SDU containing UL CCCH, SDU consisting of two header fields R/LCID. The MAC SDUs are of different sizes, and the MAC subheaders correspond to MAC SDUs, MAC CEs, or padding. Each MAC entity can transmit at most one MAC PDU per TB.

When the UE meets the uplink pre-scheduling condition, the invention saves the downlink control channel resource and simplifies the pre-scheduling process by adding one uplink authorized MAC CE and compounding the uplink authorized MAC CE and the downlink data together for transmitting to the UE.

Claims

1. A method for uplink prescheduling in wireless communication, comprising,

the base station is used for generating an uplink authorization MAC CE for the user terminal meeting the uplink pre-scheduling condition; multiplexing the uplink authorization MAC CE and the downlink data in a downlink TB together to transmit the uplink authorization MAC CE and the downlink data to the user terminal;

and the user terminal receives and decodes the uplink authorization MAC CE and the downlink data transmitted by the base station.

2. The method of claim 1, wherein the base station obtains the service type of the user terminal by calculating the downlink rate of the user terminal, and performs the pre-scheduling according to the pre-scheduling period and the pre-scheduling size configured by the service type.

3. The method of claim 1, wherein the method for pre-scheduling uplink in wireless communication comprises: assuming that a certain time of downlink scheduling is t1, calculating the uplink pre-scheduling TTI which is the latest time from the time of t1 to be t2 according to the pre-scheduling period, and obtaining delta t from t2-t1, wherein the interval set of the downlink PDCCH scheduling PUSCH configured by the system is { k2 ', k2 ', k2 ' … … }; when Δ t ∈ { k2 ', k2 ", k 2"' … … }, it indicates that PUSCH at time t2 can be scheduled at time t1, and uplink DCI is placed in uplink grant MAC CE and transmitted to the user terminal together with downlink data.

4. The method of claim 3, wherein at most 2 TBs are transmitted in one TTI during downlink TB transmission in the wireless communication system.

5. The method of claim 3, wherein the method for uplink pre-scheduling in wireless communication is characterized in that

6. The method of claim 5, wherein the additional parameters include a pre-scheduling k2 self-learning switch and a pre-scheduling k2 self-learning threshold.

7. The method of claim 6, wherein the self-learning configuration of k2 comprises the following steps:

s1, in the pre-scheduling process, if

Turn on pre-schedule k2 self-learning switch, base station pair

The condition of (1) is accumulated and counted according to different delta t;

8. The method of claim 3, wherein the uplink grant MAC CE comprises frequency domain and time domain information.

9. The method as claimed in claim 1, wherein the uplink grant MAC CE comprises a MAC header and UL GRANT MAC CE, and a payload of the uplink grant MAC CE is DCL scheduling information.

10. The method of claim 9, wherein the multiplexing of UL GRANT MAC CE, other MAC CEs and MAC SDUs is consistent with a multiplexing scheme of 3GPP standards.