CN117528743A - ORAN architecture-based energy-saving system and method for 4G extension type small base station - Google Patents
ORAN architecture-based energy-saving system and method for 4G extension type small base station Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0203—Power saving arrangements in the radio access network or backbone network of wireless communication networks
- H04W52/0206—Power saving arrangements in the radio access network or backbone network of wireless communication networks in access points, e.g. base stations
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- 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 embodiment of the invention discloses an energy-saving system and a method of a 4G expansion type small base station based on an ORAN architecture, wherein a plurality of terminals are connected under a base station of the system, and when the base station enters a low traffic state, an energy-saving control strategy A or B is selectively executed according to the current RRC user number to reduce downlink transmitting power: energy saving control strategy a: all data except the control channel and the middle preset RB are removed through the assignment of the control channel; energy saving control strategy B: the CRS signals of the second half subframe are selectively erased according to the period of broadcast channel transmission. For the 4G expansion type small base station of the ORAN architecture, when the system works in a low traffic time period, the physical layer of the base station is indicated by judging the working state through the upper layer software of the protocol stack of the base station, the pilot frequency is erased in a frequency domain or the data on a designated frequency band is erased, the transmitting power of the base station is reduced on the premise of ensuring the communication between the terminal and the base station, and the purposes of energy conservation and consumption reduction are realized.
Description
Technical Field
The invention relates to the field of wireless communication, in particular to an energy-saving system and method of a 4G expansion type small base station based on an ORAN architecture.
Background
An (Open Radio Access Network, open architecture radio access network) architecture performs new functional segmentation on the physical layer architecture of wireless communications relative to conventional CRANs. The physical layer downlink of CRAN is functionally divided as shown in fig. 1, and the physical layer downlink of the ora is newly functionally divided as shown in fig. 2.
In the architecture of the ora, the physical layer distributed in the DU is called a HighPHY, the physical layer distributed in the RU is called a LowPHY, the optical fiber connection between the DU and the RU is called a front haul FrontHaul interface, and the schedule between the HighPHY and the LowPHY is in symbol units (here, the symbol means symbol units in a radio frame structure of 4G, 1 subframe is 1ms, and 14 symbols constitute one subframe).
The behavior of the terminal is described in fig. 3.
When the terminal is in IDLE state, it is mainly in dormant state, and can monitor Paging message and SIB message issued by base station. When in an INACTIVE state, the terminal is mainly in a dormant state and monitors Paging messages and SIB (system information) messages issued by the base station, and the terminal in the INACTIVE state keeps authentication information of the core network. And when the terminal is in the CONNECTED state, various sent and received services can be normally carried out. For terminals, most of the time are in IDLE and INACTIVE, when a terminal accessed in a base station enters IDLE INACTIVE state (e.g., 2-5 a.m.), the base station is in low traffic state.
In terms of main energy consumption of the base station, as shown in fig. 4, fig. 4 is a symbol mapping of downlink one radio frame (10 subframes, 14 symbols in each subframe) in the middle 6 RBs in a frequency band, symbol 0 symbol 4 symbol 7 symbol 11 in each subframe, a black part is a Port0 CRS signal and a Port1 CRS signal in a staggered mapping manner in a frequency domain, a light gray part of continuous mapping of symbol 0 symbol 1 in each subframe is a control channel in the frequency domain, the rest of blank areas map user data when a terminal is in service, note that the intention is that 4 is only 6 RBs in the middle of the frequency band, for the configuration that the bandwidth of the current 4G base station is 20M, the part of continuous mapping in the middle is a primary synchronization channel, the light gray mapping part of the first 2 symbols in the same position as the primary synchronization channel in the frequency domain is a secondary synchronization channel, the communication protocol of 4G specifies that a synchronization channel is only in the 6 RBs in the middle of the frequency band (the bandwidth specified by the 4G communication protocol is 1.4M 3M 5M 10M 15M 20M), and the configuration that the configuration of the same bandwidth of the frequency domain is guaranteed to be different for the terminal, and the configuration is different from the bandwidth of the frequency domain.
When the terminal is in IDLE state and INACTIVE state, the base station transmits a synchronization channel Paging message and SIB message in downlink, and also has CRS pilot of full frequency band. The Paging message and the SIB message have small data quantity, do not occupy a lot of RB resources (the base station can page a plurality of terminals in one Paging message, meanwhile, the SIB message also has a period interval for sending, the base station can send the SIB message in a time-sharing way so as to reduce the occupation of frequency bands), and can be seen that when the terminals are in an IDLE state and an INACTIVE state, the user data of downlink transmission is little, but the CRS pilot signal of the whole frequency band enables the downlink transmission power to be larger, and a lot of unnecessary energy consumption is generated.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is to provide an energy-saving system and method of a 4G extended small base station based on an ORAN architecture so as to reduce downlink transmitting power.
In order to solve the above technical problems, an embodiment of the present invention provides an energy saving system of a 4G extended small base station based on an ora architecture, where a plurality of terminals are connected under the base station, and when the base station enters a low traffic state, an energy saving control policy a or B is selectively executed according to a current RRC user number to reduce downlink transmit power:
energy saving control strategy a: through the assignment of the control channel, the Paging message and the SIB message are transmitted in the middle of the frequency band, and then all data except the control channel and the middle preset RB are erased at the EU RU side;
energy saving control strategy B: and carrying out breathing pilot frequency processing, and selectively erasing CRS signals of the second half subframe according to the transmission period of the broadcast channel.
Further, the base station counts the total number of the connected terminals, and then loops through the RRC connection states of all the terminals, and if the RRC connection states of all the terminals are IDLE states or INACTIVE states, the base station determines that the base station enters a low traffic state.
Further, if the number of RRC users is greater than the preset number, the base station executes the energy-saving control strategy B, and if the number of RRC users is less than or equal to the preset number, the base station executes the energy-saving control strategy A.
Further, if the base station executes the energy-saving control policy B, the base station instructs the LowPHY to perform cyclic processing on the downlink data according to a broadcast channel period of a preset time, where the downlink data of the first radio frame is not specially processed; for the downlink subframe data except the first radio frame, the CRS signals of the second half subframe are erased.
Correspondingly, the embodiment of the invention also provides an energy-saving method of the 4G expansion type small base station based on the ORAN architecture, which comprises the following steps:
step 1: judging whether the base station enters a low traffic state currently;
step 2: if the base station enters a low traffic state, selecting to execute an energy-saving control strategy A or B according to the current RRC user number to reduce the downlink transmitting power;
energy saving control strategy a: through the assignment of the control channel, the Paging message and the SIB message are transmitted in the middle of the frequency band, and then all data except the control channel and the middle preset RB are erased at the EU RU side;
energy saving control strategy B: and carrying out breathing pilot frequency processing, and selectively erasing CRS signals of the second half subframe according to the transmission period of the broadcast channel.
Further, in step 1, the total number of terminals connected in the downlink is counted first, and the RRC connection state of all terminals is traversed in a recycling manner, and if the RRC connection state of all terminals is the IDLE state or the INACTIVE state, the base station is determined to enter the low traffic state.
Further, in step 2, if the number of RRC users is greater than the preset number, the base station executes the energy-saving control policy B, and if the number of RRC users is less than or equal to the preset number, the base station executes the energy-saving control policy a.
Further, in step 2, if the energy-saving control policy B is executed, the base station instructs the LowPHY to perform cyclic processing on the downlink data according to a broadcast channel period of a preset time, where the downlink data of the first radio frame is not specially processed; for the downlink subframe data except the first radio frame, the CRS signals of the second half subframe are erased.
The beneficial effects of the invention are as follows: when the 4G expansion type small base station of the ORAN architecture is in a low traffic state, the invention can reduce the energy consumption of RU by 50% -30% on the premise of ensuring the communication between the terminal and the base station.
Drawings
Fig. 1 is a functional partitioning diagram of a physical layer downlink of a conventional CRAN.
Fig. 2 is a diagram illustrating new functional partitioning of the physical layer downlink of an existing ora.
Fig. 3 is a state transition diagram of a terminal of the ora architecture.
Fig. 4 is a schematic channel diagram of a base station of an ora architecture transmitting 1 radio frame in downlink.
Fig. 5 is a flow chart of a method for saving energy of a 4G extended small base station based on an ora architecture according to an embodiment of the present invention.
Fig. 6 is a schematic flow chart of step 1 according to an embodiment of the present invention.
Fig. 7 is a schematic flow chart of step 2 according to an embodiment of the present invention.
Fig. 8 is a schematic flow chart of the base station upper layer software executing the energy saving control strategy a according to the embodiment of the present invention.
Fig. 9 is a schematic flow chart of the LowPHY performing the energy-saving control strategy a according to the embodiment of the present invention.
Fig. 10 is a schematic diagram of a LowPHY downlink transmission channel without any special treatment according to an embodiment of the present invention.
Fig. 11 is a schematic diagram of a LowPHY downlink transmission channel when the energy-saving control strategy a is executed according to an embodiment of the present invention.
Fig. 12 is a flowchart illustrating the execution of the energy saving control policy B by the LowPHY according to an embodiment of the present invention.
Fig. 13 is a schematic diagram of a LowPHY downlink transmission channel without special processing according to an embodiment of the present invention.
Fig. 14 is a schematic diagram of a downlink transmission channel when the LowPHY executes the energy-saving control policy B according to an embodiment of the present invention.
Detailed Description
It should be noted that, without conflict, the embodiments and features of the embodiments in the present application may be combined with each other, and the present invention will be further described in detail with reference to the drawings and the specific embodiments.
In the embodiment of the present invention, if there is a directional indication (such as up, down, left, right, front, and rear … …) only for explaining the relative positional relationship, movement condition, etc. between the components in a specific posture (as shown in the drawings), if the specific posture is changed, the directional indication is correspondingly changed.
In addition, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implying an indication of the number of features being indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature.
According to the energy-saving system of the 4G expansion type small base station based on the ORAN architecture, a plurality of terminals are connected under the base station, when the base station enters a low traffic state, according to the current RRC user number, a protocol stack of the base station selectively executes an energy-saving control strategy A or B according to different energy-saving control strategies to reduce downlink transmitting power. The number of RRC users indicates the number of terminals that have access to the base station within the base station statistics period (the number of RRC users is an accurate description of the base station internal statistics, and the terminals have not initiated access to the base station for various reasons, or the access is unsuccessful, then the base station is unaware of the presence of the terminal).
For the 4G expansion type small base station of the ORAN architecture, when the system works in a low traffic time period, the physical layer of the base station is indicated by judging the working state through the upper layer software of the protocol stack of the base station, the pilot frequency is erased in a frequency domain or the data on a designated frequency band is erased, the transmitting power of the base station is reduced on the premise of ensuring the communication between the terminal and the base station, and the purposes of energy conservation and consumption reduction are realized.
Energy saving control strategy a: the Paging message and the SIB message are transmitted in the middle of the frequency band (on the same RB position as the synchronous channel) through the assignment of the control channel, then the system instructs the lowPHY to completely wipe out the data except the control channel and the middle preset RBs (generally 6 RBs) on the EU RU side, so that the downlink transmitting power is reduced.
Energy saving control strategy B: and carrying out breathing pilot frequency processing, and selectively erasing CRS signals of the second half subframe according to the transmission period of the broadcast channel to reduce the downlink transmission power.
The premise of the base station selecting the energy-saving control strategy is to ensure that normal communication between the terminal and the base station is not affected, and on the basis, different energy-saving control strategies are selected to process signals outside the middle 6RB, so that the signals transmitted in the downlink are reduced to the greatest extent, the energy-saving efficiency is highest, but when the number of users is greater than the preset number (preferably 200), the middle 6RB cannot be met, and the scheduling of user Paging messages and SIB messages is carried out, so that the power of the downlink transmission signals is reduced by adopting the processing of breathing pilot frequency, and the energy-saving purpose is realized.
As an implementation manner, the base station counts the total number of the connected terminals, and then loops through the RRC connection states of all the terminals, and if the RRC connection states of all the terminals are IDLE states or INACTIVE states, the base station is determined to enter a low traffic state.
As an embodiment, if the number of RRC users is greater than a preset number (preferably 200), the base station executes the energy-saving control policy B, and if the number of RRC users is less than or equal to the preset number, the base station executes the energy-saving control policy a.
As an implementation manner, if the base station executes the energy-saving control policy B, the base station instructs the LowPHY to perform cyclic processing on downlink data according to a broadcast channel period (4 radio frames) of a preset time (preferably 40 ms), where downlink data of a first radio frame is not specially processed; for the downlink subframe data except the first radio frame, the CRS signals of the second half subframe are erased.
Referring to fig. 5, the energy saving method of the 4G extended small base station based on the ora architecture according to the embodiment of the present invention includes:
step 1: judging whether the base station enters a low traffic state currently;
step 2: and if the base station enters a low traffic state, selecting to execute an energy-saving control strategy A or B according to the current RRC user number to reduce the downlink transmitting power.
Energy saving control strategy a: by the assignment of the control channel, paging messages and SIB messages are transmitted centrally in the middle of the frequency band, and then data except the control channel and the middle preset RBs (6 RBs) are all erased at the EU RU side.
Referring to fig. 8, a base station indicates, through a control channel, which positions of a frequency band are in a terminal to monitor Paging messages and SIB messages, and because an energy-saving control policy a is to make special processing on signals outside a middle 6RB, RRC layer software and MAC layer software of a protocol stack running in the base station are to combine Paging messages of the terminal (one Paging message can page a plurality of terminal users), perform time-sharing scheduling on SIB messages, so that both Paging messages and SIB messages are transmitted at positions of the middle 6 RB. Meanwhile, the base station issues an energy-saving instruction through the OAM to instruct the LowPHY (the LowPHY is realized on the EU RU) to perform energy-saving processing.
Referring to fig. 9, after the lowphy (EU in this case) obtains an instruction of energy-saving processing through OAM, it performs traversing processing on each symbol in the downlink, and if it is a symbol of a control channel (the control channel indicates which positions of a frequency band the terminal listens to the message receiving data, so that it cannot perform special processing), it does not perform any processing, and if it is a symbol other than the control channel, it performs erasing processing (all data sets 0) on data other than the middle 6 RB.
Fig. 10 is a data map of 10 RBs including the middle 6 RBs without any special processing (actual 4G has 100 RBs at 20M bandwidth).
Fig. 11 shows the mapping of 10 RB data including the middle 6RB after the processing of the energy saving control policy a (the actual 4G has 100RB at 20M bandwidth), and it can be seen that after the processing, other signals are erased (data set 0) except the symbol of the control channel and the symbol of the middle 6RB, thereby significantly reducing the downlink transmission power.
Energy saving control strategy B: and carrying out breathing pilot frequency processing, and selectively erasing CRS signals of the second half subframe according to the transmission period of the broadcast channel. The number of RRC users connected under the base station exceeds the preset number (preferably 200), and transmission is not limited to be performed in the middle 6 RBs by combining Paging messages and time-sharing scheduling SIB messages, so that RRC layer software and MAC layer software on a protocol stack of the base station do not perform special processing on scheduling of the users, and the base station issues an instruction to a LowPHY (here, the LowPHY is EU) through OAM to instruct to perform breathing pilot frequency processing.
If the energy-saving control strategy B is executed, the base station instructs the LowPHY to circularly process the downlink data according to the broadcasting channel period (4 radio frames) of the preset time (40 ms), the downlink data of the first radio frame is not specially processed, the downlink subframe data except the first radio frame is processed, and the CRS signal of the second half subframe is removed.
Referring to fig. 12, lowphy (here, EU) performs cyclic processing on downlink data for each radio frame (10 ms radio frame, 10 subframes constitute one radio frame), and when the frame number modulo 4 is 0, the downlink data is not specially processed (the broadcast channel of 4G is 40ms period, that is, 4 radio frames, so as to ensure that the terminal receives all symbol information in the first radio frame of the broadcast channel).
LowPHY (here, EU) performs a respiratory pilot processing on downlink data except for the first radio frame of the broadcast channel, specifically, erases the CRS signal (CRS signal is set to 0) when the number of symbols is greater than 7 (the latter half of the subframes).
The respiration pilot frequency processing has certain dependence on the behavior of the terminal, the CRS signal of the downlink of the base station is an important basis for the terminal to perform channel estimation, and the terminal calculates the channel response of the current Slot when performing channel estimation and also refers to the historical channel estimation value. Therefore, in the invention, the first radio frame of the synchronous channel period does not do any special processing, so that the terminal calculates the correct channel estimation value, in the following 3 radio frames, the CRS signal is erased in even number of the radio frames, the terminal calculates that the current Slot channel estimation value is abnormally low (because the CRS is erased) and the terminal can refer to the historical channel estimation value to correct, and meanwhile, the period of the terminal for adjusting the historical channel estimation value is more than 40ms (4 radio frames), so that the communication of the terminal in the low traffic state is not affected by the processing of breathing pilot frequency.
Fig. 13 is a data map of 10 RBs including the middle 6 RBs (100 RBs for an actual 4G at 20M bandwidth) without any special handling when radio frame number modulo 4 equals 0.
Fig. 14 shows that when the radio frame number modulo 4 is not equal to 0, the CRS signal of the second half subframe is subjected to breathing pilot frequency processing, and the CRS signal of the second half subframe is subjected to data mapping (when the actual 4G is in 20M bandwidth, 100 RB) of 10 RBs including the middle 6RB, so that after the CRS signal of the second half subframe is erased, the total downlink symbol transmitting power in one subframe is obviously reduced.
As an embodiment, referring to fig. 6, in step 1, the total number of terminals connected in the downlink is counted first, and RRC connection states of all terminals are traversed in a circulating manner, and if the RRC connection states of all terminals are IDLE states or INACTIVE states, it is determined that the base station enters a low traffic state.
As an embodiment, referring to fig. 7, in step 2, if the number of RRC users is greater than a preset number (preferably 200), the base station executes the energy-saving control policy B, and if the number of RRC users is less than or equal to the preset number, the base station executes the energy-saving control policy a. The premise of the base station selecting the energy-saving control strategy is to ensure that normal communication between the terminal and the base station is not affected, and different energy-saving control strategies are selected on the basis: the signal processing outside the middle 6RB is performed, the downlink transmission signal is reduced to the greatest extent, the energy saving efficiency is highest, but when the number of users is more than 200, the middle 6RB can not be met, and the scheduling of the user Paging message and the SIB message is performed, so that the processing of breathing pilot frequency is adopted to reduce the power of the downlink transmission signal, and the energy saving purpose is realized.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.
Claims (8)
1. An energy-saving system of a 4G expansion type small base station based on an ORAN architecture, wherein a plurality of terminals are connected under the base station, and the energy-saving system is characterized in that when the base station enters a low traffic state, an energy-saving control strategy A or B is selectively executed according to the current RRC user number to reduce the downlink transmitting power:
energy saving control strategy a: through the assignment of the control channel, the Paging message and the SIB message are transmitted in the middle of the frequency band, and then all data except the control channel and the middle preset RB are erased at the EU RU side;
energy saving control strategy B: and carrying out breathing pilot frequency processing, and selectively erasing CRS signals of the second half subframe according to the transmission period of the broadcast channel.
2. The energy saving system of the 4G extended small base station based on the ora architecture according to claim 1, wherein the base station counts the total number of the terminals connected down first, and loops through RRC connection states of all terminals, and if the RRC connection states of all terminals are IDLE states or INACTIVE states, the base station is determined to enter the low traffic state.
3. The energy saving system of the 4G extended small base station based on the ora architecture of claim 1, wherein the base station executes the energy saving control policy B if the number of RRC users is greater than a preset number, and executes the energy saving control policy a if the number of RRC users is less than or equal to the preset number.
4. The energy saving system of the 4G extended small base station based on the ora architecture as set forth in claim 1, wherein if the base station executes the energy saving control policy B, the base station instructs the LowPHY to cyclically process the downlink data according to a broadcast channel cycle of a preset time, wherein the downlink data of the first radio frame is not specially processed; for the downlink subframe data except the first radio frame, the CRS signals of the second half subframe are erased.
5. An energy saving method of a 4G extended small base station based on an ora architecture, comprising:
step 1: judging whether the base station enters a low traffic state currently;
step 2: if the base station enters a low traffic state, selecting to execute an energy-saving control strategy A or B according to the current RRC user number to reduce the downlink transmitting power;
energy saving control strategy a: through the assignment of the control channel, the Paging message and the SIB message are transmitted in the middle of the frequency band, and then all data except the control channel and the middle 6 RBs are erased at the EU RU side;
energy saving control strategy B: and carrying out breathing pilot frequency processing, and selectively erasing CRS signals of the second half subframe according to the transmission period of the broadcast channel.
6. The method for saving energy of 4G extended small base station based on an ORAN architecture according to claim 5, wherein in step 1, the total number of terminals connected down is counted first, RRC connection states of all terminals are traversed in a recycling manner, and if the RRC connection states of all terminals are IDLE states or INACTIVE states, the base station is determined to enter a low traffic state.
7. The method for saving energy of a 4G extended small base station based on an ora architecture according to claim 5, wherein in step 2, if the number of RRC users is greater than a preset number, the base station executes an energy saving control policy B, and if the number of RRC users is less than or equal to the preset number, the base station executes an energy saving control policy a.
8. The method for saving energy of a 4G extended small base station based on an ora architecture according to claim 5, wherein in step 2, if the energy saving control policy B is executed, the base station instructs the LowPHY to perform cyclic processing on downlink data according to a broadcast channel cycle of a preset time, wherein downlink data of a first radio frame is not specially processed; for the downlink subframe data except the first radio frame, the CRS signals of the second half subframe are erased.
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| CN110291735A (en) * | 2016-12-05 | 2019-09-27 | 瑞典爱立信有限公司 | It is monitored with configurable control channel come control electrode letter carrier operation |
| US20200288392A1 (en) * | 2019-03-08 | 2020-09-10 | Parallel Wireless, Inc. | Energy-Efficient Base Station With Synchronization |
| WO2022227995A1 (en) * | 2021-04-30 | 2022-11-03 | 华为技术有限公司 | Energy-saving method and apparatus |
| WO2023246101A1 (en) * | 2022-06-22 | 2023-12-28 | 中兴通讯股份有限公司 | Energy-saving method, and base station and terminal device |
| CN115643631A (en) * | 2022-10-13 | 2023-01-24 | 长安大学 | Base station regulation and control method and system based on cognitive radio |
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