CN110636550B - Multi-user uplink scheduling method based on base station side resource reservation under wide coverage scene - Google Patents
Multi-user uplink scheduling method based on base station side resource reservation under wide coverage scene Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/04—Error control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
- H04W28/26—Resource reservation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/1221—Wireless traffic scheduling based on age of data to be sent
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
- H04W72/1268—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of uplink data flows
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/53—Allocation or scheduling criteria for wireless resources based on regulatory allocation policies
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses a multi-user uplink scheduling method based on base station side resource reservation in a wide-coverage scene. Belonging to the field of mobile communication. First, the terminal applies for uplink transmission resources from the base station and reports its own location information. And the base station calculates the transmission time delay of the unidirectional link according to the position information reported by the terminal and the position information of the base station. And according to the link time delay and the terminal fixed processing time delay, the base station can calculate the time of the uplink data of the corresponding terminal reaching the base station and reserve available transmission resources for the terminal. Then, the base station sends uplink authorization to the terminal to inform the terminal of uplink transmission resource information. And after the terminal receives the uplink authorization issued by the base station and fixed processing time delay, the terminal occupies pre-allocated resources and immediately starts to transmit data to the base station. And finally, the data reaches the base station after the transmission delay of the unidirectional link. The base station responds to the terminal uplink request by using the method of the invention, and performs uplink resource reservation on the base station side, thereby realizing the uplink conflict-free and minimum time delay scheduling of multiple users for uplink transmission resources.
Description
Technical Field
The invention belongs to the field of mobile communication, and particularly relates to a multi-user uplink resource scheduling technology based on base station side resource reservation under a wide-coverage large-delay scene.
Background
With the development of wireless communication industry, communication can be realized under the coverage of a ground mobile network by using a terminal, but the coverage of the ground mobile network is limited, and the construction of stations in oceans, deserts and some remote areas is difficult, so that signals are difficult to cover. The realization of global and seamless coverage of communication services has become the main target direction in the field of wireless communication at present, which requires that a communication system has the characteristics of wide coverage range, no ground condition constraint, flexibility, mobility and the like, wherein satellite mobile communication is an important way for realizing global coverage of communication services. In a wide-coverage scene, a plurality of user terminals occupy resources and access communication, and reasonable scheduling of time-frequency resources for realizing multi-user uplink transmission becomes an important subject in a global-coverage interconnected communication system.
In a 4G/5G system, a UE (User Equipment) uplink scheduling process in a cell is as follows: UE sends Sounding Reference Signal (SRS) information to provide a Reference Signal for uplink resource scheduling, and a base station side measures uplink transmission Channel Quality (CQI); when uplink service arrives, the UE sends a BSR (Buffer Status Report) or an uplink Scheduling Request SR (Scheduling Request) or a random contention access Request to the base station, indicates that uplink data arrives, and requests the base station to allocate wireless resources; a base station sends an uplink transmission resource authorization indication to UE through a Physical Downlink Control Channel (PDCCH); the UE sends data to the base station according to the time-frequency resource designated by the uplink transmission resource authorization indication; the base station receives data according to the uplink transmission resource indication information recorded locally and feeds back ACK/NACK according to whether the received data is decoded accurately; and the UE determines to retransmit or transmit new data according to the feedback indication issued by the base station through the PDCCH. The transmission delay between the UE and the base station is very small, considering that the uncertainty of uplink timing is just larger than the radius of a cell, the unidirectional transmission delay (3.3 mus/km) of about 3.3 mus is provided every 1km, taking the LTE 100km cell as an example, the maximum unidirectional transmission delay between the most marginal UE and the central base station is 0.33ms and is less than one transmission scheduling time slot, namely the delay does not exceed one scheduling time slot, and the allocation and occupation of time slot resources are not influenced.
In a communication system with wide coverage, for example, a common satellite communication system, a satellite has a high orbit and a large coverage area, a signal transmission delay (5 to 200 ms) is far beyond a transmission time interval, and a delay difference between covered terminals is large (0.5 to 10 ms). Different terminals receive the uplink scheduling authorization indication sent by the base station at the same time at different times. The terminal with small transmission delay always occupies resources at an earlier moment, the terminal with large transmission delay occupies resources at a later moment, and after a plurality of time slots, the terminal with small transmission delay and the terminal with large transmission delay scheduled by the previous time slot have the problem of collision and conflict of uplink transmission resources. As shown in fig. 1, since the user 3 is far away, after the user 1 sends data information for the second time, two data blocks arrive at the base station in the same time slot, and since the two users use the same frequency, collision occurs.
The problem of scheduling multi-user uplink resources in a wide coverage scene needs to be solved urgently in order to respond to a terminal uplink scheduling request in time, achieve conflict-free uplink resource allocation, guarantee uplink data transmission of a terminal.
Disclosure of Invention
In order to respond to a terminal uplink request in a wide-coverage scene as soon as possible and to cope with the transmission delay difference from different terminals to a base station, the invention provides a multi-user uplink scheduling method based on base station side resource reservation in the wide-coverage scene. As shown in fig. 2, the basic process of uplink scheduling includes uplink scheduling indication, grant, transmission and feedback. The scheduling method is provided for responding the uplink scheduling request in time and realizing conflict-free allocation and occupation of uplink scheduling resources of the terminal.
The technical scheme adopted by the invention is a multi-user uplink scheduling method based on base station side resource reservation in a wide-coverage scene, and the method comprises the following steps:
step 1: a terminal applies for an uplink scheduling request to a base station through a BSR, SR or random competition access mode, indicates that uplink data arrives, requests to allocate wireless resources, and reports self position information to the base station;
step 2: the base station receives the uplink scheduling request, simultaneously acquires the position information of the terminal, and calculates the transmission delay of a bidirectional link between the terminal and the base station by combining the position information of the base station; setting the processing time delay from receiving uplink authorization to sending uplink data of all terminals to be a fixed value; calculating the uplink data which can be received by the terminal after the fastest N slots according to the transmission delay of the bidirectional link and the fixed processing delay; a base station pre-allocates uplink resources after N slots for a terminal, and considers that different time slots and frequency resources are reserved for different terminals; meanwhile, the base station sends an uplink resource authorization indication to the terminal;
and step 3: after the transmission delay of a base station-terminal link, the terminal receives the uplink resource authorization, and after the fixed processing delay, the terminal occupies pre-allocated resources and immediately sends uplink data;
and 4, step 4: after the delay of the terminal-base station link, that is, the nth slot of the uplink authorization is issued at the base station, the base station receives the uplink data, the base station feeds back ACK/NACK according to whether the received data is correctly decoded, and the terminal determines retransmission or new data transmission according to the feedback indication of the base station.
Further, in the step 1, the terminal applies for an uplink scheduling request to the base station, applies for resources to the base station through the BSR/SR, and sends that the BSR itself occupies an RB (Resource Block) Resource, which is suitable for a continuous scheduling scenario in which the terminal has uplink authorization; the method for sending the SR request applies for that the uplink scheduling request is applicable to a sparse scheduling scene in a synchronous state, the SR is transmitted in a PUCCH (physical uplink Control channel), when a base station detects an SR signal of a certain terminal, an uplink grant with a proper size (enough terminals bring BSRs up) is distributed to the terminal, the terminal sends PUSCH data through a resource position indicated by the grant, the base station obtains how many resources the terminal needs to distribute specifically through the BSRs contained in the PUSCH data, and indicates resource Information distributed to the terminal through DCI (Downlink Control Information); here, UCI (Uplink Control Information) Information of the terminal includes terminal position Information.
Further, in step 2, N = bidirectional link transmission delay + fixed processing delay.
Further, in step 3, the base station issues an uplink grant to indicate the terminal to transmit uplink resource scheduling information, the uplink grant reaches different user terminals after experiencing different link transmission delays, the terminal with a small transmission delay receives the uplink grant first, the terminal with a large transmission delay receives the uplink grant, the user terminal immediately responds after receiving the uplink grant information, and immediately occupies the pre-allocated resource of the base station to transmit uplink data after experiencing a fixed processing delay.
Further, in step 4, the base station receives data at the nth slot after the authorization indication according to the calculated bidirectional link propagation delay and the fixed processing delay, performs decoding processing, feeds back a decoding result to the terminal, and the terminal determines whether retransmission is needed. Therefore, the scheduling indication of the base station at the same time is responded at different times, the terminal requests are responded fastest by scheduling resource pre-allocation, and the communication delay is prevented from being increased.
The invention discloses a base station side-based multi-user uplink resource pre-scheduling method in a wide-coverage scene. Compared with the prior art, the method has the following beneficial effects: the method of the invention can allocate the uplink resources for the terminal without conflict as soon as possible through the base station side resource pre-allocation method. Meanwhile, the method is suitable for the communication characteristics of large communication time delay and large time delay difference between terminals in a wide-coverage scene, and has wide engineering significance.
Drawings
Fig. 1 is a schematic diagram of uplink resource scheduling conflict.
Fig. 2 is a schematic diagram of an uplink data transmission process.
Fig. 3 is a schematic diagram of location information bearer.
Fig. 4 is a diagram illustrating terminal-base station transmission delays.
Fig. 5 is a diagram of the difference in transmission delays for different terminals within a beam.
Fig. 6 is a timing chart of the uplink scheduling control of the present invention.
Fig. 7 is a timing diagram of multiuser uplink scheduling according to the present invention.
Fig. 8 is a schematic diagram of base station side resource pre-allocation.
Detailed Description
The invention is further described with reference to the following figures and examples.
The invention provides a multi-user uplink scheduling method based on base station side resource reservation in a wide-coverage scene, and as shown in fig. 2, the basic process of uplink scheduling comprises uplink scheduling indication, authorization, transmission and feedback. Taking a satellite internet communication system as an example, a method for conflict-free allocation and occupation of uplink scheduling resources of a terminal is described.
The technical scheme adopted by the invention comprises the following steps:
Step 2, as shown in fig. 4, the base station receives the uplink scheduling request, the base station obtains the terminal position information, the base station calculates the transmission delay T0+ T1 of the unidirectional link between the terminal and the base station by combining the ephemeris information, the base station allocates RB resources to the terminal by DCI, and different time slots and frequency resources are reserved for different user terminals in consideration. And at the moment of Ta, the base station sends an uplink authorization indication to the terminal.
And 3, experiencing the unidirectional link transmission Delay = T0+ T1, receiving the uplink authorization indication by the terminal, and sending data and BSR to the base station by the terminal after the terminal experiences the fixed processing Delay CW. In a multi-user system, different users experience different transmission delays, and different terminal requests can be responded under the shortest delay.
And 4, after N slots, namely Ta + Delay + CW + Delay time, the base station receives the uplink data sent by the terminal, and the base station feeds back ACK/NACK according to whether the received data is accurately decoded. And the terminal determines to retransmit or transmit new data according to the feedback indication of the base station.
Referring to fig. 3, when the terminal needs to send UCI information to the base station and the subframe has no PUSCH resource in step 2, UCI is transmitted through a PUCCH channel; if there is PUSCH data to be sent in the subframe, UCI is transmitted through the PUSCH channel. The position information and the UCI are reported together, the terminal reports longitude and latitude position information, the longitude information range is from west longitude 180 degrees to east longitude 180 degrees, the latitude information range is from south hemisphere 90 degrees to north hemisphere 90 degrees, corresponding binary representation needs 9 bits and 8 bits respectively, and if the reported positioning accuracy is improved, the binary number can be increased. When the subcarrier frequency interval is 120kHz, one slot contains 14 symbols, when QPSK or 8PSK is adopted in the system, one RE symbol respectively bears 2bit and 3bit information, 12 subcarriers are contained in the frequency domain, and then 17 bits (less than one REG) can report the basic longitude and latitude information of the terminal to the base station. Increasing the number of bits increases the accuracy, and in QPSK, the longitude information can be represented by 24 bits, and the latitude information can also be represented by 24 bits, one 48 bit, two REG sizes. If 8PSK modulation is used, the longitude information may be represented by 18 bits, and the latitude information may be represented by 18 bits, for a total of 36 bits, with one REG size. In addition, according to actual needs, the reporting position precision can be more flexible. The base station acquires the position information of the terminal and the global information (ephemeris information) of the base station, can calculate the transmission delay of the bidirectional link between the terminal and the base station, and can predict the accurate transmission delay of the downlink authorization sent by the base station and the uplink transmission of the terminal.
Referring to fig. 4, in step 3, the terminal sends an uplink request to the base station for reception, and the base station resolves the transmission delay according to the information: there is a transmission delay of T0 time between the base station and the satellite, and the transmission delay of the satellite and the terminal in the cell (beam) is T1. And issuing an uplink authorization instruction at the time of Ta, wherein the terminal receives the instruction to wait for the fixed processing time delay CW, and sends data to the base station to experience the transmission time delay of T0+ T1, so that the shortest time delay experienced by one-time uplink transmission is 2 (T0 + T1) + CW.
Referring to fig. 5, when different terminals receive uplink scheduling instructions at different times in step 4, the minimum transmission delay from a satellite to a cell (beam) corresponding to the terminal is T1, the maximum transmission delay at a far end is T2, the transmission delay experienced by other terminals reaching the cell is Ti, and T0 is the common transmission delay between the base station and the satellite. Under the fastest response of base station resource reservation scheduling, the response delay of uplink indication in a cell is 2 (T0 + Ti) + CW, the communication delay of a terminal under the strategy of the fastest response is 2 (T0 + T2) + CW, and the shortest time is 2 (T0 + T1) + CW.
Referring to fig. 6, for a primary terminal uplink scheduling timing, at time t1, the terminal indicates uplink transmission, sends UCI information, and reports location information; the base station receives the SR at the time of t2, the MAC assembles the DCI bearing the uplink authorization indication, the PHY modulates, codes and maps the DCI information to the RE, and the DCI information is sent out at the time of t3 through an air interface; after experiencing transmission Delay, the terminal t4 blindly detects DCI information, uplink scheduling information in the DCI informs MAC for the TB of the MAC group, and the MAC sends data to PHY in the form of TB; at the time of t5, the terminal modulates, codes and maps the TB data to the RE, and transmits the TB data through an air interface; and at the time of t6, the base station side demodulates the data on the PUSCH, if the data is successful, the data is reported to the MAC, and if the data is unsuccessful, the HARQ is triggered. The invention adopts shortest time delay scheduling, an uplink scheduling request arriving first is processed first and is issued from uplink scheduling authorization to uplink data receiving, the time delay experienced by the shortest time delay scheduling is bidirectional link transmission time delay + fixed processing time delay =2 × delay + CW, and a time slot represents unit scheduling time length. Different user terminals experience different transmission delays, have the same fixed processing delay, and are scheduled by the shortest delay of each terminal.
Referring to fig. 7, the multi-user uplink transmission finally realizes that the transmitted data is received by the base station, and realizes that the uplink resource is occupied without collision and requests the shortest delay response. At the time of t1, the base station issues an uplink authorization indication of multiple users, and the terminal modulates, codes and maps TB data onto RE (resource element) and transmits the TB data through an air interface; at the time t2, t3, t4, different terminals receive the uplink authorization information, and after the same fixed processing delay, at the time t5, t6, t7, the data is received respectively, the terminals experience different link transmission delays, and resources occupied by uplink data transmission are time-frequency resources pre-allocated to each terminal by the base station at the time t1, and the resources are occupied without conflict during uplink scheduling. The shortest time delay scheduling is realized under the resource pre-allocation method at the base station side, and the shortest communication time delays experienced by the terminals 1,2 and 3 are CW +2 Delay1, CW +2 Delay2 and CW +2 Delay3 respectively.
Referring to fig. 8, before the base station sends the grant information, the time slot for receiving the user data information is obtained by prediction, and frequency allocation is performed according to the obtained arrival time slot information of each terminal data, and if the same time slot will reach multiple terminal data, different frequencies are allocated to these users. And after the pre-allocation is finished, the authorization information is sent to the user terminal, and the terminal selects the corresponding frequency to send data according to the obtained information, so that the occurrence of collision is effectively avoided when the base station receives the data.
The above detailed description of the embodiments of the present invention, and the detailed description of the embodiments of the present invention used herein, is merely intended to facilitate the understanding of the methods and apparatuses of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (1)
1. The multi-user uplink scheduling method based on base station side resource reservation under the wide-coverage scene comprises the following steps:
step 1: a terminal applies for an uplink scheduling request to a base station through a BSR, SR or random competition access mode, indicates that uplink data arrives, requests to allocate wireless resources, and reports self position information to the base station;
a terminal applies for an uplink scheduling request to a base station, applies for resources to the base station through a BSR/SR, and sends that the BSR occupies RB resources, so that the method is suitable for a continuous scheduling scene with uplink authorization of the terminal; the method for sending the SR request applies for an uplink scheduling request to be applicable to a sparse scheduling scene in a synchronous state, the SR is transmitted in a PUCCH (physical uplink control channel), when a base station detects an SR signal of a certain terminal, uplink authorization with a proper size is distributed to the terminal, the terminal sends PUSCH (physical uplink shared channel) data through a resource position indicated by the authorization, and the base station knows how many resources are specifically required to be distributed to the terminal through a BSR (buffer status report) contained in the PUSCH data and indicates resource information distributed to the terminal through DCI (downlink control information); here, the UCI information of the terminal includes terminal position information;
step 2: the base station receives the uplink scheduling request, simultaneously acquires the position information of the terminal, and calculates the transmission delay of a bidirectional link between the terminal and the base station by combining the position information of the base station; setting the processing time delay from receiving uplink authorization to sending uplink data of all terminals to be a fixed value; calculating the uplink data which can be received by the terminal after the fastest N slots according to the transmission delay of the bidirectional link and the fixed processing delay; the base station pre-allocates uplink resources after N slots for the terminal, and considers reserving different time slots and frequency resources for different terminals; meanwhile, the base station sends an uplink resource authorization indication to the terminal;
wherein, N = bidirectional link transmission delay + fixed processing delay;
and 3, step 3: after the transmission delay of a base station-terminal link, the terminal receives the uplink resource authorization, and after the fixed processing delay, the terminal occupies pre-allocated resources and immediately sends uplink data;
and 4, step 4: after the delay of a terminal-base station link, namely, the Nth slot of the uplink authorization is issued at the base station, the base station receives the uplink data, the base station feeds back ACK/NACK according to whether the received data is correctly decoded, and the terminal determines to retransmit or transmit new data according to the feedback indication of the base station;
and the base station receives data at the Nth slot after the authorization indication according to the calculated bidirectional link propagation delay and the fixed processing delay, performs decoding processing, feeds back a decoding result to the terminal, and the terminal judges whether retransmission is needed.
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| CN113965873B (en) * | 2020-07-03 | 2023-03-24 | 维沃移动通信有限公司 | Information transmission method, device, terminal and network side equipment |
| WO2022117339A1 (en) * | 2020-12-02 | 2022-06-09 | Nokia Technologies Oy | Apparatuses and methods for enhancement of cell reconnection for client nodes in non-terrestrial networks |
| CN114765831A (en) * | 2021-01-12 | 2022-07-19 | 华为技术有限公司 | Method and related equipment for pre-applying uplink resources |
| CN115884229B (en) * | 2023-01-29 | 2023-05-12 | 深圳开鸿数字产业发展有限公司 | Transmission delay management method, electronic device and storage medium |
| CN116527123B (en) * | 2023-07-04 | 2023-09-08 | 成都本原星通科技有限公司 | Time slot allocation method based on terminal position information |
| CN117119602A (en) * | 2023-07-10 | 2023-11-24 | 北京云智软通信息技术有限公司 | User equipment scheduling method, device and base station |
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