CN108174424B - Beam switching method based on variable-length time slot - Google Patents
Beam switching method based on variable-length time slot Download PDFInfo
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- CN108174424B CN108174424B CN201711438532.3A CN201711438532A CN108174424B CN 108174424 B CN108174424 B CN 108174424B CN 201711438532 A CN201711438532 A CN 201711438532A CN 108174424 B CN108174424 B CN 108174424B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/046—Wireless resource allocation based on the type of the allocated resource the resource being in the space domain, e.g. beams
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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
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
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- Mobile Radio Communication Systems (AREA)
- Radio Relay Systems (AREA)
Abstract
The invention discloses a beam switching method based on a variable length time slot, which is suitable for a communication system in which a mobile terminal switches between beams and solves the problems that data is lost when a frequency division multiple access system switches over the beams, and the resource utilization rate of the traditional time division system is not high. The mobile terminal of the invention still monopolizes the carrier wave. The terminal only uses consecutive data slots in units of seconds only, without requiring a zone crossing. When the cell needs to be crossed, the time slot length of the data time slot is determined according to the time length of the mobile terminal in the overlapping area of the available wave beams, the minimum detection times constraint and the minimum service transmission rate, and the service detection time slot for detecting in the target wave beam is allocated. When the handover is completed, the sounding slot is cancelled and the mode using only the data slot is restored. The scheme realizes the seamless handover of the mobile terminal at the cost of less time slot protection.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a communication system suitable for switching between wave beams of a mobile terminal.
Background
In the field of satellite communication, the utilization rate of spectrum resources is generally improved by adopting a spot beam coverage mode. Each spot beam forms a cell, the coverage area is usually only a few hundred kilometers, and it is necessary to technically support the coverage area of the mobile terminal traversing different beams. Typically, fixed frequency band resources are used within each beam, and the frequency band resources of adjacent beams are different.
The power value at the center of the beam is the largest and gradually decreases towards the edge of the beam. As the mobile terminal moves from the center of beam a to the adjacent beam B, the signal strength between the mobile terminal and beam a gradually decreases and the signal strength between the mobile terminal and beam B gradually increases. When reaching a certain degree, the mobile terminal needs to switch to use the satellite resource of the new beam B, and the satellite resource of the original beam is not used any more.
FDMA system has the advantages of high resource utilization rate and low communication delay, but when the beam is switched, data loss occurs due to the transmission in a data stream synchronization mode. TDMA can simultaneously switch between transmitting and receiving sides by realizing clock synchronization, so that data interruption can not occur during handover. However, the resource utilization of TDMA is low due to the large timeslot guard time of TDMA. The invention aims to introduce clock synchronization on the basis of frequency division multiple access to realize the non-inductive beam handover of an upper layer.
Disclosure of Invention
The technical problem to be solved by the invention is to design a resource allocation method for terminal handover, and the system still monopolizes carrier waves at the mobile terminal, so that a receiving terminal can distinguish different sending terminals through frequency points. After a timing synchronization mechanism is introduced, the carrier waves are divided into different time slots.
The technical scheme adopted by the invention is as follows:
a resource allocation method for terminal handoff includes the following steps:
(1) the network control or the control console sends the carrier information and the time slot plan to the mobile terminal and the ground terminal; the carrier information comprises a central frequency point, a carrier rate and an initial modulation coding mode of a carrier in the primary beam; the time slot plan content is a list, and each item of content is time slot starting time, used carrier, time slot category, time slot length, modulation coding mode and spread spectrum ratio; the time slot category is divided into a data time slot and a detection time slot;
(2) when the mobile terminal does not need to cross the region, all time slots in the time slot plan are used for transmitting data by using the carrier in the primary beam, and the ground terminal receives the data according to the time slot plan and finishes the process; when the time-zone is needed to be crossed, the network control or the control console allocates a new carrier or uses a pre-planned carrier in a target wave beam, compresses the length of a data time slot as required and inserts a detection time slot;
(3) the network control or the control console transmits the carrier parameters of the new carrier of the target wave beam and the new time slot plan to the mobile terminal through the ground terminal;
(4) the mobile terminal uses the carrier wave in the original beam to transmit data in the data time slot according to the new time slot plan, and uses the new carrier wave of the target beam to transmit the detection signal in the detection time slot;
(5) the ground terminal receives data and detection signals sent by the mobile terminal, acquires channel quality according to the received detection signals, and feeds the channel quality back to the mobile terminal or a reporting network control or a control console; if the information is fed back to the mobile terminal to execute the step (6), if the information is reported to a console, executing the step (7);
(6) the mobile terminal judges whether the channel quality meets the requirement, if so, a data transmission switching request is sent to a network control or a control console, the network control or the control console cancels the detection time slot, recovers the duration of the data time slot, uses a new carrier of a target wave beam in the data time slot and informs the mobile terminal; if the requirement cannot be met, the handover fails, and a time slot plan before the handover is recovered or other beams are tried to be detected;
(7) the network control or the control console judges whether the channel quality meets the requirement, if so, the network control or the control console cancels the detection time slot, recovers the duration of the data time slot, uses a new carrier of the target wave beam in the data time slot and informs the mobile terminal; if the requirement cannot be met, the handover fails, and the time slot plan before the handover is recovered or other beams are tried to be detected to inform the mobile terminal.
Wherein the length of the data slot is set to several seconds or more without the need for transzone.
When the zone needs to be crossed, the length of the data time slot and the time interval of the detection time slot are determined according to the time length of the mobile terminal crossing the beam overlapping area, the minimum required detection times and the minimum service transmission rate.
Compared with the background technology, the invention has the advantages that:
compared with an FDMA system, the method has the advantages that data of the mobile terminal is not lost during beam switching; compared with a TDMA system, the time slot protection time is shorter, and the utilization efficiency of satellite resources is improved.
Drawings
FIG. 1 is a schematic flow chart of the algorithm of the present invention;
fig. 2 is a schematic diagram of carrier timeslot resources used by the mobile terminal in handover according to the present invention;
FIG. 3 is a schematic representation of a satellite communication system in which the present invention may be implemented;
fig. 4 is a schematic diagram of the protocol flow of the present invention.
Detailed Description
As shown in fig. 3, the satellite communication system applied in the method is composed of a network control/control station, a ground terminal, a mobile terminal and a communication satellite. And the network control/control console is responsible for the distribution of satellite resources, and the control instruction of the network control/control console is communicated with the mobile terminal through the ground terminal. The protocol flow diagram is shown in fig. 4, and the specific implementation steps are as follows:
(1) the network control or the control console sends the carrier information and the time slot plan to the mobile terminal and the ground terminal; the carrier information comprises a central frequency point, a carrier rate and an initial modulation coding mode; the time slot plan content is a list, and each item of content is time slot starting time, used carrier, time slot category, time slot length, modulation coding mode and spread spectrum ratio; the time slot category is divided into a data time slot and a detection time slot;
(2) when the mobile terminal does not need to cross the region, all time slots in the time slot plan are used for transmitting data by using a carrier (marked as carrier 1) of an original beam, and the ground terminal receives the data according to the time slot plan and finishes the process; when it needs to cross the area, as shown in fig. 1, the network control or the console determines whether the target beam has a corresponding idle carrier, if so, the network control or the console allocates a new carrier or uses a pre-planned carrier (denoted as carrier 2) in the target beam, and compresses the data slot length as needed and inserts the detection slot; otherwise, judging whether the target wave beam has new allocable carrier waves, if so, the network control or the console allocates the new carrier waves or uses the pre-planned carrier waves in the target wave beam, and compresses the length of the data time slot according to the requirement and inserts the detection time slot (multiplexing time slot); otherwise, informing the mobile terminal that the target wave beam resource is insufficient and the cross-area is failed;
the triggering of the beam switching can be in two ways: one is that the network control or the control console sends the coverage area information of the wave beam to the mobile terminal, and the mobile terminal sends the wave beam switching application to the network control or the control console according to the self position information; the other mode is that the mobile terminal periodically reports the position information to a network control or a control console through a satellite link, and the network control or the control console judges that the terminal needs to cross the area. When the mobile terminal needs to perform handover, the network control/control console may determine the time slot length of the data time slot according to the duration of the mobile terminal in the overlapping region of the available beams, the minimum detection time constraint, and the minimum service transmission rate (optional), and allocate a service detection time slot for detection in the target beam. If the minimum duration for the mobile terminal to traverse the beam overlap region is 20 seconds and the minimum number of required detections is 5 times, the length of the data slot needs to be less than 4 seconds. To reduce transmission delay, only one sounding slot is usually inserted into two data slots. Fig. 2 shows a schematic diagram of carrier timeslot resources used by a mobile terminal during handover;
(3) the network control or the control console transmits the carrier parameters of the new carrier of the target wave beam and the new time slot plan to the mobile terminal through the ground terminal;
(4) the mobile terminal uses the carrier wave in the original beam to transmit data in the data time slot according to the new time slot plan, and uses the new carrier wave of the target beam to transmit the detection signal in the detection time slot;
(5) the ground terminal receives data and detection signals sent by the mobile terminal, acquires channel quality according to the received detection signals, and feeds the channel quality back to the mobile terminal or a reporting network control or a control console; if the information is fed back to the mobile terminal to execute the step (6), if the information is reported to a console, executing the step (7);
(6) the mobile terminal judges whether the channel quality meets the requirement, if so, a data transmission switching request is sent to a network control or a control console, the network control or the control console cancels the detection time slot, recovers the duration of the data time slot, uses a new carrier of a target wave beam in the data time slot and informs the mobile terminal; if the requirement cannot be met, the handover fails, a time slot plan before the handover is recovered or other beams are tried to be detected, and the network control or the control console recovers the carriers in the original beams as required. (ii) a
(7) The network control or the control console judges whether the channel quality meets the requirement, if so, the network control or the control console cancels the detection time slot, recovers the duration of the data time slot, uses a new carrier of the target wave beam in the data time slot and informs the mobile terminal; if the requirement cannot be met, the handover fails, the time slot plan before the handover is recovered or other beams are tried to be detected, and the mobile terminal, the network control or the control console are informed to recover the carriers in the original beams as required.
The principle of the invention is as follows:
the system still monopolizes the carrier wave at the mobile terminal, so the receiving terminal can distinguish different sending terminals through the frequency point. After a timing synchronization mechanism is introduced, the carrier waves are divided into different time slots. In this context, a timeslot plan refers to parameters such as start time, timeslot length, timeslot type, carrier used by a timeslot, modulation mode used by a timeslot, code length, code rate, and spreading ratio of different timeslots. The slot type herein relates only to data slots and sounding slots. The data slots are used for transmitting traffic data. The transmitting terminal transmits a sounding signal in a sounding time slot, and the receiving terminal determines the channel quality according to the sounding signal received in the sounding time slot. The network control distributes the time slot plan and sends the time slot plan to the related terminals, and the related terminals transmit and receive according to the time slot plan.
When no handover occurs, the mobile terminal uses only one carrier in the beam and only allocates data slots in the slot plan. When the area needs to be crossed, the network control allocates a carrier in the target beam in advance or according to the requirement, and comprehensively determines the detection frequency according to the speed of the mobile terminal, the area of the area overlapping, the service bandwidth needing the minimum guarantee and other factors. Generally, a mobile terminal needs to transmit multiple detections to adjust a transmission level, so that communication quality can be guaranteed on a new carrier, and a power bandwidth ratio of a satellite transponder can be kept balanced. The new time slot plan is determined according to factors such as detection frequency and the like, and comprises a data time slot and a detection time slot, wherein the detection time slot uses a new carrier frequency point which is a target wave beam, and the service time slot still uses an original carrier. After the cross-region detection is successful, the new time slot plan recovers to only allocate the service time slot and uses the carrier frequency point of the target wave beam.
Claims (3)
1. A method for switching beams based on variable length time slots is characterized by comprising the following steps:
(1) the network control or the control console sends the carrier information and the time slot plan to the mobile terminal and the ground terminal; the carrier information comprises a central frequency point, a carrier rate and an initial modulation coding mode of a carrier in the primary beam; the time slot plan content is a list, and each item of content is time slot starting time, used carrier, time slot category, time slot length, modulation coding mode and spread spectrum ratio; the time slot category is divided into a data time slot and a detection time slot;
(2) when the mobile terminal does not need to cross the region, all time slots in the time slot plan are used for transmitting data by using the carrier in the primary beam, and the ground terminal receives the data according to the time slot plan and finishes the process; when needing to cross the area, the network control or the console judges whether the target wave beam has a corresponding idle wave, if so, the network control or the console allocates a new carrier or uses a pre-planned carrier in the target wave beam, compresses the length of the data time slot as required and inserts the detection time slot; otherwise, judging whether the target wave beam has a new carrier which can be distributed, if so, the network control or the console distributes the new carrier in the target wave beam or uses the carrier which is planned in advance, and compressing the length of the data time slot according to the requirement and inserting the detection time slot; otherwise, informing the mobile terminal that the target wave beam resource is insufficient and the cross-area is failed;
(3) the network control or the control console transmits the carrier parameters of the new carrier of the target wave beam and the new time slot plan to the mobile terminal through the ground terminal;
(4) the mobile terminal uses the carrier wave in the original beam to transmit data in the data time slot according to the new time slot plan, and uses the new carrier wave of the target beam to transmit the detection signal in the detection time slot;
(5) the ground terminal receives data and detection signals sent by the mobile terminal, acquires channel quality according to the received detection signals, and feeds the channel quality back to the mobile terminal or a reporting network control or a control console; if the information is fed back to the mobile terminal to execute the step (6), if the information is reported to a console, executing the step (7);
(6) the mobile terminal judges whether the channel quality meets the requirement, if so, a data transmission switching request is sent to a network control or a control console, the network control or the control console cancels the detection time slot, recovers the duration of the data time slot, uses a new carrier of a target wave beam in the data time slot and informs the mobile terminal; if the requirement cannot be met, the handover fails, and a time slot plan before the handover is recovered or other beams are tried to be detected;
(7) the network control or the control console judges whether the channel quality meets the requirement, if so, the network control or the control console cancels the detection time slot, recovers the duration of the data time slot, uses a new carrier of the target wave beam in the data time slot and informs the mobile terminal; if the requirement cannot be met, the handover fails, and the time slot plan before the handover is recovered or other beams are tried to be detected to inform the mobile terminal.
2. The method of claim 1, wherein the length of the data slot is set to several seconds without the need of crossing the zone.
3. The method of claim 1, wherein the length of the data slot and the time interval of the sounding slot are determined according to the duration of the mobile terminal crossing the beam overlapping area, the minimum required number of sounding and the minimum traffic transmission rate when the crossing of the area is required.
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| CN201711438532.3A CN108174424B (en) | 2017-12-27 | 2017-12-27 | Beam switching method based on variable-length time slot |
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| CN201711438532.3A CN108174424B (en) | 2017-12-27 | 2017-12-27 | Beam switching method based on variable-length time slot |
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| CN108174424A CN108174424A (en) | 2018-06-15 |
| CN108174424B true CN108174424B (en) | 2020-10-30 |
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| CN110708714B (en) * | 2018-07-10 | 2022-01-25 | 维沃移动通信有限公司 | Beam failure detection method, terminal and network equipment |
| CN111417155B (en) * | 2019-01-07 | 2022-02-11 | 中国移动通信有限公司研究院 | Switching method, base station and terminal |
| CN111405626B (en) * | 2020-04-16 | 2021-11-26 | 南京邮电大学 | Method for realizing pre-switching of microcell based on time slot calculation |
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| US7203520B2 (en) * | 2003-09-30 | 2007-04-10 | Nortel Networks Limited | Beam wobbling for increased downlink coverage and capacity |
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| CN101848023A (en) * | 2009-11-26 | 2010-09-29 | 浙江大学 | Multiuser MIMO downlink transmission mode selection method based on rateless code |
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