CN112398527B - Control method and system for enabling satellite system to rapidly enter sleep state - Google Patents
Control method and system for enabling satellite system to rapidly enter sleep state Download PDFInfo
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- 230000007958 sleep Effects 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 29
- 230000005540 biological transmission Effects 0.000 claims abstract description 25
- 230000008054 signal transmission Effects 0.000 claims abstract description 8
- 230000005059 dormancy Effects 0.000 claims description 10
- 230000011664 signaling Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
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- 230000004622 sleep time Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
- H04B7/18532—Arrangements for managing transmission, i.e. for transporting data or a signalling message
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
- H04B7/18539—Arrangements for managing radio, resources, i.e. for establishing or releasing a connection
- H04B7/18543—Arrangements for managing radio, resources, i.e. for establishing or releasing a connection for adaptation of transmission parameters, e.g. power control
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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
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Abstract
The invention relates to a control method and a system for a satellite system to quickly enter a sleep state. The control method and the system for the satellite system to rapidly enter the sleep state determine the time delay of a one-way link in signal transmission according to the acquired distance, then determine a threshold value according to the time delay and the acquired rate of downlink transmission data, and further judge whether to generate an MAC control unit signal according to the relation between the residual data of the satellite data buffer area and the threshold value, so as to control the UE to rapidly enter the sleep state according to the MAC control unit signal, thereby achieving the purpose of saving electric energy.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a control method and a system for a satellite system to rapidly enter a sleep state.
Background
In recent years, as Terrestrial fifth generation mobile communication (5G) enters into commercial use, 3GPP working groups have also started to study the convergence of satellite communication and Terrestrial 5G, and have been dedicated to solve the NTN (Non-Terrestrial Network) problem with the 5G technology.
The current power consumption of 5G terminals is a big problem, and how to reduce the power consumption is a place for further improvement in the communication industry. Therefore, it has to be mentioned that the concept of Drx (Discontinuous Reception) is used, and this method can make a UE (user equipment) periodically enter a sleep state at some time, and wake up from the sleep state when monitoring is needed without monitoring a PDCCH (Physical Downlink Control Channel), so that the UE can achieve the purpose of saving power. Although this has some impact on the latency of the data transmission, it makes sense to perform Drx in view of the more important power consumption of the UE if such latency does not impact the user experience.
However, since the satellite is far away from the ground UE, the satellite communication itself has a characteristic of high delay, and the prior art does not consider this delay factor, so that when the message of some shutdown timers reaches the terminal, the timers have already timed out, which does not achieve the original purpose of the protocol, and cannot enter the sleep state in time, thereby increasing the power consumption.
Disclosure of Invention
The invention aims to provide a control method and a control system for a satellite system to rapidly enter a sleep state, so that a satellite can rapidly leave a Drx On _ Duration state to enter sleep, and the aim of saving electric energy is fulfilled.
In order to achieve the purpose, the invention provides the following scheme:
a control method for rapidly entering a sleep state of a satellite system comprises the following steps:
acquiring the distance between a satellite and UE;
determining the time delay of a unidirectional link in signal transmission according to the distance;
acquiring the rate of downlink data transmission of each UE in each slot;
determining a threshold value according to the time delay and the rate of the downlink transmission data;
and when the residual data of the satellite data buffer area is equal to the threshold value, generating an MAC control unit signal, and controlling the UE to enter the dormancy according to the MAC control unit signal.
Preferably, the determining a threshold value according to the time delay and the rate of the downlink transmission data specifically includes:
determining an average rate according to the rate of the downlink sending data;
and determining a threshold value according to the average speed and the time delay.
Preferably, the threshold value is:
K＝V*T；
wherein K is a threshold value, V is an average rate, and T is a time delay.
Preferably, the threshold value is:
wherein K is a threshold value, T is a time delay, and VnFor the rate of sending data in the downlink, N is more than or equal to M, and M belongs to [80,160 ]]。
Corresponding to the control method provided by the invention, the invention also correspondingly provides the following system:
a control system for a satellite system to quickly enter a sleep state, comprising:
the distance acquisition module is used for acquiring the distance between the satellite and the UE;
the time delay determining module is used for determining the time delay of the unidirectional link in the signal transmission according to the distance;
a rate obtaining module, configured to obtain a rate at which each UE sends data in each slot in a downlink;
a threshold value determining module, configured to determine a threshold value according to the time delay and the rate of the downlink transmission data;
and the dormancy module is used for generating an MAC control unit signal when the residual data of the satellite data buffer area is equal to the threshold value, and controlling the UE to enter dormancy according to the MAC control unit signal.
Preferably, the threshold value determining module specifically includes:
an average rate determining unit, configured to determine an average rate according to the rate of the downlink transmission data;
and the threshold value determining unit is used for determining the threshold value according to the average rate and the time delay.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the control method and the system for the satellite system to rapidly enter the sleep state provided by the invention are characterized in that the time delay of a unidirectional link in signal transmission is determined according to the obtained distance, then the threshold value is determined according to the time delay and the obtained rate of downlink transmission data, and whether an MAC control unit signal is generated or not is further judged according to the relation between the residual data of a satellite data buffer area and the threshold value, so that the UE is controlled to rapidly enter the sleep state according to the MAC control unit signal, and the aim of saving electric energy is fulfilled.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic drawing of a Drx cycle;
FIG. 2 is a schematic diagram of a Drx transmission mechanism after adding a Drx-Inactivity timer;
FIG. 3 is a schematic diagram of a Drx transmission scheme after adding MAC control unit signals;
FIG. 4 is a flowchart of a control method for rapidly entering a sleep state in a satellite system according to the present invention;
FIG. 5 is a schematic diagram of the calculation of specific TA and common TA;
FIG. 6 is a flowchart illustrating an embodiment of waking up to sleeping of a terminal;
fig. 7 is a schematic structural diagram of a control system for rapidly entering a sleep state of a satellite system according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a control method and a control system for a satellite system to rapidly enter a sleep state, so that a satellite can rapidly leave a Drx On _ Duration state to enter sleep, and the aim of saving electric energy is fulfilled.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The implementation of the Drx mechanism in the idle state and the connected state is different, and the Drx mechanism in the connected state is relatively complex. The invention introduces the Drx mechanism in the connected state, and the Drx mechanism in the idle state is the paging mechanism, which is not described in detail. The Drx described in the present invention refers to Drx used when the UE is in the connected state.
A typical Drx cycle is shown in fig. 1, and the time period marked "Drx on duration timer" is the time period during which the UE monitors the downlink PDCCH subframe, and during this time period, the UE is in an awake state. The time from Drx Cycle to Drx on duration timer is Drx sleep time, i.e., the time when the UE goes to sleep without monitoring PDCCH subframes for power saving. As can be seen from fig. 1, the longer the time for Drx sleep, the lower the power consumption of the UE, but correspondingly, the delay of traffic transmission will increase. In fig. 1, SFN is fully called SystemFrameNumber in english, and chinese is fully called system frame number in chinese.
For example, the following scenarios exist: the sub-frame 0 is the last sub-frame of the wake-up time On _ Duration, and at this time, the network side has just one large byte of data to be sent to the UE, and the data cannot be completely sent in the sub-frame 1. If Drx cycle according to fig. 1 is followed, the UE will enter Drx sleep state in subframe No. 1 and will not receive any downlink PDSCH data from the network side. The network side can only wait until the end of the Drx cycle and continue to send the data which is not transmitted to the UE when the next On _ Duration time arrives. Although this processing mechanism has no error, it obviously increases the processing delay of the whole service. To avoid this, a Drx inactivity timer is added to the Drx mechanism, as shown in fig. 2.
If Drx inactivity timer is running, the UE needs to continue monitoring downlink PDCCH subframes even if the originally configured On Duration time has ended until Drx inactivity timer times out. Adding the Drx-inactivytytytimer mechanism obviously reduces the processing latency of the data, but this introduces another problem described below.
Fig. 2 illustrates that the Drx-inactivity timer is used to reduce the processing delay of data, but if the duration of the Drx-inactivity timer is set too long, and the timer has not timed out after the data on the network side is sent, the UE has to continue to monitor the downlink subframe and cannot enter the sleep state in time.
In order To bring the UE To Sleep as quickly as possible, the present invention introduces a MAC control unit Drx command, also referred To as Go-To-Sleep CE, associated with Drx.
When the network side detects that no downlink data is available, a MAC PDU may be sent to the UE, where the PDU carries a Drx command control unit (i.e., MAC control unit). After receiving the Drx command control unit, the UE stops the On Duration Timer and the Drx-Inactivity Timer, and enters the sleep state as soon as possible, as shown in fig. 3.
Based on the technical concept, the invention provides a control method for a satellite system to rapidly enter a sleep state, as shown in fig. 4, the control method comprises the following steps:
step 100: acquiring the distance between a satellite and UE;
step 101: determining the time delay of a unidirectional link in signal transmission according to the distance;
step 102: acquiring the rate of downlink data transmission of each UE in each slot;
step 103: determining a threshold value according to the time delay and the rate of the downlink transmission data, specifically comprising:
determining an average rate according to the rate of the downlink sending data;
and determining a threshold value according to the average speed and the time delay. The threshold value may be determined by the formula K ═ V ═ T, or may be determined by the formula
And (4) determining.
In the formula, K is a threshold value, V is an average speed, T is a time delay, and V isnFor the rate of sending data in the downlink, N is more than or equal to M, and M belongs to [80,160 ]]。
During the initial random access process, the UE is responsible for compensating the specific TA, and the satellite is responsible for compensating the common TA. After the random process is over, the satellite already knows the total delay offset, i.e., the sum of Common TA and specific TA. The calculation principle of specific TA and common TA is shown in fig. 5, where specific TA is 2 × d1-d0)/c, and common TA is 2 × d 0/c. And the satellite calculates the time delay T of the unidirectional link according to the distance between the UE and the satellite, wherein T is (common TA + specific TA)/2.
Step 104: and when the residual data of the satellite data buffer area is equal to the threshold value, generating an MAC control unit signal, and controlling the UE to enter the dormancy according to the MAC control unit signal.
The following provides a specific embodiment to further illustrate the scheme of the present invention, and the specific embodiment of the present invention is described by taking the terminal wake-up and sleep process shown in fig. 6 as an example, and in a specific application, the scheme of the present invention is also applicable to other terminal wake-up and sleep processes.
The terminal awakening and sleeping process is carried out based on the control method, and the terminal awakening and sleeping process specifically comprises the following steps:
step 1: and the UE is started and resides in the NTN network.
Step 2: in a typical Drx cycle, the OnDurationTimer and Drx-inactivytytytimer are turned on in sequence.
And step 3: and the satellite calculates the time delay T of the unidirectional link according to the distance between the UE and the satellite.
And 4, step 4: the satellite local dynamic maintains a table (as shown in table 1), and counts the rate of downlink data transmission of each UE in each slot; and taking the data transmission rate of the UE in the total M slots from the (N-M) th slot to the (N-1) th slot, and calculating the average value V of the data transmission rates.
And 5: and when the residual data of the satellite data buffer area is equal to V x T, transmitting the Drx Command MAC CE.
Step 6: after receiving the Drx control unit, the UE stops the OnDurationTimer and the Drx-inactivity timer and enters a sleep state as soon as possible, thereby achieving the energy saving effect.
TABLE 1
| SlotNum | N-M | N-(M-1) | …… | N-1 |
| Rate of downlink data transmission of UE | VN-M | VN-(M-1) | …… | VN-1 |
Wherein, M takes the value range [80,160 ].
For example, in desert regions, the UE powers up to camp on the satellite network. The NTN network configures the Drx parameter through an RRC message. The terminal enables the Drx mechanism. In the last subframe of the wakeup time On _ Duration, the network side has a large byte of data to send to the UE, and the UE starts a Drx-Inactivity timer when receiving the PDCCH and indicating a new data window number. And when the residual data of the satellite data buffer area is equal to the threshold value, transmitting a Drx Command MAC CE. After receiving the Drx control unit, the UE stops OnDurationTimer and Drx-inactivity timer and enters a sleep state.
In addition, corresponding to the control method provided by the invention, the invention also correspondingly provides the following system:
a control system for a satellite system to rapidly enter a sleep state, as shown in fig. 7, comprising: the device comprises a distance acquisition module 1, a time delay determination module 2, a rate acquisition module 3, a threshold value determination module 4 and a dormancy module 5.
The distance acquisition module 1 is used for acquiring the distance between a satellite and the UE;
the time delay determining module 2 is used for determining the time delay of the unidirectional link in the signal transmission according to the distance;
the rate obtaining module 3 is configured to obtain a rate at which each UE transmits data in each slot in a downlink manner;
the threshold value determining module 4 is configured to determine a threshold value according to the time delay and the rate of the downlink transmission data;
and the dormancy module 5 is used for generating an MAC control unit signal when the residual data of the satellite data buffer area is equal to the threshold value, and controlling the UE to enter dormancy according to the MAC control unit signal.
Preferably, the threshold value determining module 4 specifically includes:
an average rate determining unit, configured to determine an average rate according to the rate of the downlink transmission data;
and the threshold value determining unit is used for determining the threshold value according to the average rate and the time delay.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the control system disclosed by the embodiment, the control method disclosed by the embodiment corresponds to the control system disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the description of the method part.
The principle and the implementation of the present invention are explained herein by applying specific examples, and the above description of the embodiments is only used to help understand the control method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (6)
1. A control method for a satellite system to quickly enter a sleep state is characterized by comprising the following steps:
acquiring the distance between a satellite and UE;
determining the time delay of a unidirectional link in signal transmission according to the distance;
acquiring the rate of downlink data transmission of each UE in each slot;
determining a threshold value according to the time delay and the rate of the downlink transmission data;
and when the residual data of the satellite data buffer area is equal to the threshold value, generating an MAC control unit signal, and controlling the UE to enter the dormancy according to the MAC control unit signal.
2. The method for controlling a satellite system to rapidly enter a sleep state according to claim 1, wherein the determining a threshold value according to the delay and the downlink data transmission rate specifically includes:
determining an average rate according to the rate of the downlink sending data;
and determining a threshold value according to the average speed and the time delay.
3. The method as claimed in claim 2, wherein the threshold values are:
K＝V*T；
wherein K is a threshold value, V is an average rate, and T is a time delay.
4. The method as claimed in claim 2, wherein the threshold values are:
wherein K is a threshold value, T is a time delay, and VnFor the rate of downlink data transmission, N-1 and N-M are slot sequence numbers, N is larger than or equal to M, and M belongs to [80,160 ]]。
5. A control system for a satellite system to rapidly enter a sleep state, comprising:
the distance acquisition module is used for acquiring the distance between the satellite and the UE;
the time delay determining module is used for determining the time delay of the unidirectional link in the signal transmission according to the distance;
a rate obtaining module, configured to obtain a rate at which each UE sends data in each slot in a downlink;
a threshold value determining module, configured to determine a threshold value according to the time delay and the rate of the downlink transmission data;
and the dormancy module is used for generating an MAC control unit signal when the residual data of the satellite data buffer area is equal to the threshold value, and controlling the UE to enter dormancy according to the MAC control unit signal.
6. The system according to claim 5, wherein the threshold value determining module specifically comprises:
an average rate determining unit, configured to determine an average rate according to the rate of the downlink transmission data;
and the threshold value determining unit is used for determining the threshold value according to the average rate and the time delay.
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