CN102340854B - Mobile communication system base station energy-saving method and device - Google Patents
Mobile communication system base station energy-saving method and device Download PDFInfo
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Abstract
The embodiment of the invention discloses a method for realizing mobile communication system base station energy saving, which is applied to a line terminator equipment (LTE) system. The method of the embodiment of the invention comprises the steps that: the business load value of a downlink sub frame is determined; when the business load value of the downlink sub frame is smaller than the business load threshold value of the downlink sub frame, the symbol configuration in the downlink sub frame is detected; a symbol closing time template is determined according to the symbol configuration in the downlink sub frame; and a corresponding radio frequency channel is closed according to the symbol closing time template. When the scheme of the downlink sub frame or a time slot is inappropriate to be implemented, the energy consumption of a base station is reduced by closing a downlink symbol, so that energy is saved. The embodiment of the invention provides the device for realizing the method.
Description
Technical Field
The present invention relates to the field of mobile communication technologies, and in particular, to a method and an apparatus for saving energy in a base station in a mobile communication system.
Background
From the energy consumption distribution of the mobile communication network system, in the whole mobile network, the energy consumption of the base station facility is the largest and accounts for 90%, and other facilities including the core network facility and the network management equipment only account for less than 10%. In the energy consumption of the base station facility, the base station main equipment accounts for about 50%, and the heat dissipation equipment such as a machine room air conditioner accounts for about 45%.
In order to reduce energy consumption, a green mobile communication network is established, and the technology is mainly considered from the following three aspects:
1. in the aspect of base station main equipment design, various new technologies such as a high-efficiency digital power amplifier and the like are applied, and new products such as a distributed base station, a large-capacity base station and the like are introduced; the method supports more flexible deployment, supports multiple systems, and improves the utilization rate of hardware facilities;
2. in the aspect of building a machine room, intelligent ventilation transformation is carried out on a base station, such as direct ventilation application, natural heat dissipation and other modes, and an integrated machine room is adopted, so that the requirements of the machine room on heat dissipation equipment are reduced;
3. in the aspect of energy application, the proportion of green clean energy such as solar energy, wind energy, methane and the like is improved.
Wherein, the energy-saving design of the base station main equipment and the key significance of the application are related. The energy consumption of the main equipment of the base station is effectively reduced, the dependence of the equipment on the machine room environment can be effectively reduced, and the load of a matched power supply and a machine room air conditioner is reduced to a great extent, so that the total energy consumption is more effectively reduced.
In the base station master equipment, most energy is used for a power amplifier of a key component of a base station transmitting unit, and how to reduce the energy consumption of the power amplifier and reduce the generation of heat as much as possible on the premise of ensuring the linear index of the power amplifier is the key for reducing the overall energy consumption of the equipment and saving energy.
In order to achieve the purpose of energy saving and consumption reduction, in the network management of the whole mobile communication, resource fine management needs to be adopted, for example, in a certain period (for example, between ten o 'clock at night and five o' clock in the morning), if users are few in some areas, on the premise that the basic communication requirements are met, part of carrier frequencies can be turned off, and therefore energy consumption is effectively reduced.
The development of the technology puts higher energy-saving requirements on the fine management of the mobile communication system. How to more finely manage the energy consumption of the base station equipment and reduce unnecessary energy consumption is an important task in system design and implementation in the future. As a new generation mobile communication system, an LTE (Long Term Evolution) system will be increasingly applied in the future, reducing the energy consumption of the LTE system, and having important significance for building a green mobile communication network.
Disclosure of Invention
The embodiment of the invention mainly aims at an LTE system and provides a method and a device for realizing energy saving of a base station by closing symbols in a downlink subframe.
The embodiment of the invention provides an energy-saving method for a base station of a mobile communication system, which comprises the following steps:
determining a downlink subframe service load value;
when the downlink subframe service load value is smaller than a downlink subframe service load threshold value, detecting the configuration of symbols in a downlink subframe;
determining a symbol closing time template according to the configuration of the symbols in the downlink subframe;
and closing the corresponding radio frequency channel according to the symbol closing time template.
An embodiment of the present invention provides a base station apparatus, including a base station scheduler and a baseband data processing unit, and further including: the device comprises a counting unit, a judging unit, a detecting unit and a radio frequency channel closing executing unit; wherein,
a statistic unit, configured to collect and count downlink subframe service load value information, and report statistic result information according to a set period; the set period is an integral multiple of 10 ms;
a judging unit, configured to judge whether the downlink subframe service load value is smaller than a downlink subframe service load threshold value according to the statistical result information reported by the statistical unit;
the detection unit is used for detecting the configuration of symbols in the downlink subframe and determining a symbol closing time template;
and the radio frequency channel closing execution unit is used for executing the operation of closing the radio frequency channel according to the symbol closing time template.
The embodiment of the invention provides a Radio Remote Unit (RRU) device, which comprises a baseband data receiving unit and is characterized by also comprising: a radio frequency channel closing information detection unit and a radio frequency channel closing execution unit;
the radio frequency channel closing information detection unit is used for determining symbol closing time template information according to a detection result, producing and sending an instruction for closing the radio frequency channel;
and the radio frequency channel closing execution unit is used for executing the operation of closing the radio frequency channel according to the instruction of the radio frequency channel closing detection unit.
The invention mainly provides a method and a device for realizing energy conservation and emission reduction by closing a downlink symbol aiming at an LTE (Long Term Evolution) system, and can further reduce the energy consumption of a base station by closing the downlink symbol and realize energy conservation when a scheme of closing a downlink subframe or a time slot is not suitable to be implemented.
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FIG. 1 is a schematic diagram of a first type of radio frame structure of an LTE system;
FIG. 2 is a diagram illustrating a second type of radio frame structure of an LTE system;
fig. 3 is a schematic diagram of a downlink physical resource of an LTE system;
fig. 4a is a schematic diagram of a method for acquiring a conventional timeslot configuration of a downlink subframe according to an embodiment of the present invention;
fig. 4b is a schematic diagram illustrating a method for obtaining a time slot configuration of a sub-frame 0/5 according to an embodiment of the present invention;
fig. 5 is a schematic diagram of an integrated energy-saving base station apparatus according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a first distributed energy-saving base station apparatus according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a second distributed energy-saving base station apparatus according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a method and a device for realizing energy conservation and emission reduction by closing downlink symbols for an LTE (Long Term Evolution) system, so that when downlink subframes or time slots are not suitable to be closed, the energy consumption of a base station can be reduced by closing partial downlink symbols and closing corresponding radio frequency channels, and the purposes of energy conservation and emission reduction are achieved.
The embodiment of the invention provides a method for realizing energy conservation of a base station, which specifically comprises the following steps:
determining a downlink subframe service load value;
when the downlink subframe service load value is smaller than a downlink subframe service load threshold value, detecting the configuration of symbols in a downlink subframe;
determining a symbol closing time template according to the configuration of the symbols in the downlink subframe;
and closing the corresponding radio frequency channel according to the symbol closing time template.
When the cell load is relatively small, part of the downlink subframes have idle or carry OFDM symbols with small traffic, and the symbols carry no or little downlink traffic data. During the time period when the rf signal is not transmitted, the rf channel will still be in an operating state, in which case the consumed energy is not converted into a useful rf signal, but is consumed in a heat loss manner. Therefore, when the system actually operates and provides the mobile communication service, the base station can make the corresponding radio frequency channel enter a low energy consumption state or a closed state by using the closed part of the downlink symbols under the condition that the load of the downlink subframe is less than a certain threshold value, thereby reducing the energy consumption.
With the Quality of Service (QoS) guaranteed as a basic starting point, when a base station detects a downlink subframe traffic load value in real time during operation, the base station may start symbol-closing operation on a part of subframes when the downlink subframe traffic load value is smaller than a downlink subframe traffic load threshold value, or when the downlink subframe traffic load value is smaller than the downlink subframe traffic load threshold value within a certain period of time.
The measurement of the downlink subframe traffic load value may be implemented by monitoring the capacity index in real time, for example, monitoring the data amount in the downlink data Buffer (Buffer) in real time, or according to the statistical average data amount of the data amount in the downlink Buffer (the statistical period is an integral multiple of 10 ms).
The number of the closed symbols and the downlink sub-frame traffic load threshold value are related to the average data size that can be carried by one sub-frame,
the threshold value of the service load of the downlink subframe is equal to the average data quantity carried by the downlink subframe multiplied by gamma; where γ is the set load factor. The average data volume carried by the downlink sub-frame can be obtained according to the service statistical data.
If the downlink sub-frame service load value is less than the downlink sub-frame service load threshold value, the method for realizing energy saving by closing part of symbols can be started.
The third generation mobile communication system standardization organization (3GPP) specifies that the Long Term Evolution (LTE) system of the 3G radio interface technology supports 2 radio frame structures:
A. a first radio frame (hereinafter, referred to as Type1) suitable for Frequency Division Duplex (FDD) system is shown in fig. 1, where:
the frame length of Type1 is 10ms, and is composed of 20 slots (slots), each of which has a length of 0.5ms, and is marked as #0 to #19 in fig. 1. Every two consecutive slots are defined as one Subframe (Subframe), for a total of 10 subframes, i.e.: subframe i consists of time slots 2i and 2i +1, where i ═ 0, 1, 2.
When Type1 is applied to FDD system, 10 subframes are available for uplink and downlink every 10ms since uplink and downlink of frequency division duplex system are separated in frequency domain.
B. The second Type of radio frame (hereinafter referred to as Type2) is only applicable to TDD systems, and its structure is shown in fig. 2, where:
the frame length of the wireless frame is 10ms, and each frame is divided into 2 half frames of 5 ms. Dividing each 5ms half frame into 8 conventional Time slots (slots) with the length of 0.5ms and 1 special Time Slot region with the length of 1ms, wherein the 1ms special Time Slot region consists of a Downlink Pilot Time Slot (DwPTS), a Guard Time Slot (GP) and an Uplink Pilot Time Slot (UpPTS); meanwhile, every two regular slot pairs constitute one sub-frame (Subframe), where sub-frame #0 and the downlink pilot slot are always used for downlink transmission, and the uplink pilot slot is always used for uplink transmission. The frame structure of the LTE-TDD system currently defines 7 configuration modes, as shown in table one:
watch I,
Wherein D represents a downlink normal subframe, U represents an uplink normal subframe, and S represents a special subframe. When the cell networking is planned, the downlink/uplink subframe proportion configuration of the cell is determined, and the downlink/uplink subframe proportion configuration is basically not changed subsequently.
When determining a downlink subframe in which a symbol can be turned off, the influence of a common channel, such as broadcasting, paging, etc., needs to be considered; the impact of uplink data scheduling needs to be considered; the impact on the uplink data HARQ response needs to be considered; and the impact of semi-persistent scheduling needs to be considered.
As shown in fig. 3, the minimum Resource unit used for transmission in the LTE system is a Resource Element (RE), and a Resource Block (RB) is formed by several Resource elements. The downlink physical channel corresponds to a set of resource elements for carrying information originating from a higher layer.
The PSCH (Primary Synchronization CHannel), SSCH (Secondary Synchronization CHannel), and PBCH (Physical Broadcast CHannel) among the downlink Physical channels belong to a cell-level CHannel, and their resource locations are determined as follows:
for FDD systems, the PSCH is located on the middle 72 subcarriers of the last OFDM symbol of slot 0 and slot 10; for a TDD system, the PSCH is located on the middle 72 subcarriers of the third OFDM symbol in subframe 1 and subframe 6.
For FDD systems, the SSCH is located on the middle 72 subcarriers of slot 0 and slot 10 penultimate OFDM symbols; for a TDD system, the SSCH is located on the middle 72 subcarriers of the first last OFDM symbol in slot 1 and slot 11.
The PBCH is located on the middle 72 subcarriers of the first four symbols of slot 1 of subframe 0.
Thus, for an FDD system, where subframe 0 and subframe 5 cannot implement closed subframes due to carrying broadcast channels and synchronization signals; for a TDD system, where subframe 0, subframe 1, subframe 5, and subframe 6 also cannot implement a closed subframe due to carrying a broadcast channel or a synchronization signal, subframe 2 is always set as an uplink subframe and also cannot be set as a closed downlink subframe. When the subframes for executing the symbol closing operation are determined, the subframes can adopt a symbol closing mode, and the purposes of energy saving and consumption reduction are achieved. For other subframes which can be closed, when part of the service is carried, the method of closing the symbol can be adopted to achieve the purpose of energy saving and consumption reduction.
In the LTE system, the downlink control channel includes: a PCFICH (Physical Control format indicator CHannel), a PHICH (Physical Hybrid arq indicator CHannel), and a PDCCH (Physical Downlink Control CHannel).
The PCFICH carries information on the number of OFDM symbols (1, 2, 3, or 4) used for transmitting the PDCCH in one subframe. The PCFICH is transmitted in the first symbol of a downlink subframe; UE is inThe duration span of the DCI (measured in terms of the number of OFDM symbols) must be determined before the control information is demodulated. The system indicates the number of OFDM symbols occupied by the PDCCH by cfi (control Format indicator) 1, 2, and 3. In thatThe DCI may span 1, 2, or 3 in duration, as characterized by the value of the CFI. In thatThe duration span of DCI may be from 2 OFDM symbols to 4 OFDM symbols, which is characterized by CFI + 1. When the number of symbols occupied by the PDCCH is greater than 0, the PCFICH exists. The 2-bit information of the PCFICH is encoded into 32 bits, QPSK modulation is adopted, the PCFICH maps 4 resource element groups (REGs, i.e. 4 continuous physical resource elements) which are not used as reference symbols in the first OFDM symbol in the downlink subframe, and the 4 REGs for mapping the PCFICH are distributed on the whole system bandwidth at equal intervals.
The PHICH contains ACK/NACK feedback information corresponding to a PUSCH (Physical Uplink Shared Channel). A plurality of PHICHs are mapped to the same resource element to form a PHICH group, which is mapped to physical resource elements not used for transmission of a reference signal and a PCFICH.
The PDCCH carries scheduling and other control information, which mainly include UL-SCH (Uplink Shared CHannel), DL-SCH (Downlink Shared CHannel) allocation information, and TPC (Transmit power control) information of the PUCCH and PUSCH, respectively. The PDCCH occupies the first N OFDM symbols of the subframe, and the value of N may be 1, 2, 3, or 4.
In principle, the operation of turning off the symbol can be performed as long as there is a downlink subframe of an idle symbol. For the sub-frame which does not reach the full load of the data bearing of the corresponding sub-frame, the data borne by part of the symbols can be transferred to other downlink sub-frames for bearing through scheduling, and then the closing operation is executed on the corresponding symbols.
After determining the subframe in which the symbol closing operation can be performed, the configuration of the symbols in the downlink subframe needs to be obtained. When determining the closed time template, the influence of the control area, and the influence of the common reference Signal, PSS (Primary Synchronized Signal), SSS (Secondary Synchronized Signal), PBCH (Primary Synchronized Signal) need to be considered. Because the paging information is issued in a Physical Downlink Shared CHannel (PDSCH), no special processing is required when the symbol time template is judged to be closed; since the broadcast channel and the downlink synchronization signal are carried at the fixed positions of the sub-frame 0 and the sub-frame 5, if the off symbol operation needs to be performed, it needs to be separately considered for judgment. Since the terminal needs to perform channel estimation according to the downlink reference signal, the position of the reference symbol cannot perform the operation of turning off the symbol.
The following conditions are analyzed, and the implementation mode of obtaining the symbol configuration condition in the downlink subframe is detected. As shown in fig. 4a, 4 b.
And (I) detecting the symbol configuration condition in the downlink subframe for the normal subframe (non-subframe 0/5 and special subframe) to obtain a method flow of the symbol closing time template. The 2 nth slot (n-0) is judged from the L-1 th symbol, and the 2n +1 th slot is judged from the L-0 th symbol. Fig. 4a illustrates a method for detecting a symbol configuration of a normal subframe by taking the normal subframe without downlink data transmission as an example.
Step 1: if the lth symbol of the 2 nth slot is 0 or a specific value for identifying that the symbol does not carry data indicates that the symbol can be turned off, if the normal CP configuration is adopted, turning off the lth symbol to the 3 rd OFDM symbol of the 2 nth slot, skipping the 4 th symbol, turning off the 5 th symbol and the 6 th symbol, and if L >4, turning off the lth symbol to the 6 th symbol; if the extended CP configuration is adopted, the lth symbol to the 2 nd OFDM symbol of the 2 nth slot are turned off if L <3, the 3 rd symbol is skipped, the 4 th symbol and the 5 th symbol are turned off, and the lth symbol to the 5 th symbol are turned off if L > 3.
Step 2: if the Lth symbol of the 2 nth time slot is not 0, judging that the Lth symbol is L +1 symbol, if the symbol is in the normal CP configuration, L is less than 7, turning to Step1, otherwise, ending the time slot judgment; if the configuration is the extended CP, L <6, go to step1, otherwise, end the time slot judgment.
Step 3: the 2n +1 th slot is judged from the L-0 th symbol, and the judgment steps are the same as Step1 and Step 2.
(II) for subframe 0 or subframe 5, the method flow for detecting and obtaining the symbol configuration condition in the downlink subframe and obtaining the symbol closing time template is shown in fig. 4 b.
If it is the frame structure type1, i.e. FDD system, the 2 nth slot (n is 0) is judged from the L1 th symbol, if it is the normal CP configuration, if L <4, the L3 rd to 3 rd OFDM symbols of the 2 nth slot are closed; if the extended CP configuration is adopted, the Lth symbol to the 2 nd OFDM symbol of the 2 nth time slot are closed if L < 3. And if the 2n +1 time slot is in the normal CP configuration, starting to judge from the L-th symbol being 5, if the CP is in the extended CP configuration, starting to judge from the L-th symbol being 4, if the L-th symbol on each antenna port is 0, closing the L-th symbol to the last symbol, otherwise, ending to judge the last symbol by the L-L + 1.
If the frame structure type2 is the TDD system, for the 2 nth time slot, starting to detect from the 1 st OFDM symbol, determining the configuration information of the time template of symbol closing; for the 2n +1 th slot, in the case of a normal CP, detection starts from the L-5 th OFDM symbol; in the case of the extended CP, starting from the L-th 4 OFDM symbols, determining the configuration information of the time template with the closed symbols; wherein the last OFDM symbol of the 2n +1 th slot cannot be turned off.
According to the downlink subframe configuration condition of the obtained closed symbol, the symbol closed time template can be determined.
The method for closing the corresponding radio frequency channel according to the symbol closing time template can execute one-time complete closing operation of the radio frequency channel, and can also execute step-by-step closing of the radio frequency channel, namely, the small signal part of the sub radio frequency channel is closed (analog devices such as a digital-to-analog converter and an analog transceiver) and the large signal part is closed (a power amplifier).
In addition, when the channel quality is good, the configuration of the common reference signal can be changed by the control of the scheduler to obtain more closed symbol numbers. Such as modifying a 4-port to a 2-port.
The embodiment of the invention also provides a concrete implementation mode of the energy-saving base station device.
If the base station adopts an integrated structure, the radio frequency channel closing execution unit can directly close the radio frequency channel according to the time template of the radio frequency channel closing decided by the base station. If the Base station adopts a distributed structure (i.e. a BBU + RRU architecture is adopted), a Radio frequency channel closing information detection notification Unit can be arranged on the BBU (Base Band Unit) side for notifying the RRU (Radio Resource Unit) of the time template information for closing the Radio frequency channel; or, a radio frequency channel closing information detection notification unit is not arranged on the BBU side, and at this time, the RRU side needs to control the radio frequency channel according to the time template after recovering the time template for closing the radio frequency channel according to the data sent to the RRU by the BBU.
In the process of detecting and obtaining the configuration of the symbols in the downlink subframe and determining the symbol closing time template, it needs to judge which downlink symbols are closed, and then needs to judge whether the symbols bear data. The function of judging whether the downlink symbol carries data can be completed in the physical layer of the baseband board, and the symbol closing time template can be determined on the basis of the judgment. In this case, the symbol closing time template information needs to be transmitted to the RRU unit through the Ir interface. And a radio frequency channel closing information detection unit can be arranged at the RRU side, and symbol closing time template information is recovered according to a detection result by detecting baseband data from the BBU received by the RRU. Where the decision whether a symbol carries data or not can be determined by the processing power of the hardware.
The device according to the invention is described below in several embodiments.
For the integrated base station, the present invention provides a specific implementation apparatus, as shown in fig. 5, the base station apparatus includes: a statistic unit 501, a judgment unit 502, a detection unit 503, a base station scheduler 504, a baseband data processing unit 505, a radio frequency channel closing information detection unit 506 and a radio frequency channel closing execution unit 507.
The statistical unit 501 is configured to collect and count downlink subframe traffic load value information, and report statistical result information according to a set period. The reporting period can be set as required, and the set period is an integral multiple of 10 ms.
A judging unit 502, configured to judge whether the downlink subframe traffic load value is smaller than a downlink subframe traffic load threshold value according to the statistics result information reported by the statistics unit 501; and notifies the detection unit 503 of the determination result.
A detecting unit 503, configured to detect a symbol configuration in a downlink subframe when a downlink subframe traffic load value is smaller than a downlink subframe traffic load threshold value; and further determines a symbol closing time template according to the configuration of the symbols in the downlink subframe, and informs the base station scheduler 504.
The base station scheduler 504 schedules the data to be carried according to the symbol closing time template, and notifies the baseband data processing unit 505. For symbols not carrying downlink data, no scheduling is required.
Whether the symbol bears data or not is judged, the judgment can be completed on a physical layer of a baseband board, but judgment information needs to be transmitted to a logic judgment unit (generally completed on an FPGA) of the RRU through an Ir interface, and the logic judgment unit closes a radio frequency channel corresponding to the symbol which does not bear data. The logic judgment unit of the RRU receives the baseband signal from the BBU through the Ir interface, and can also complete the judgment function in the logic judgment unit, and the judgment of whether the symbol bears data is determined by the processing capacity of hardware.
If the symbol carrying the downlink data needs to be closed, scheduling is needed, and the carried data is transferred to other available subframes for transmission, so that the symbol can be closed only after becoming a symbol not carrying data. In the symbol that confirms closing, will not carry on the data scheduling; no data scheduling will be performed on the associated uplink resources.
The baseband data processing unit 505 sets the symbol data for performing the symbol closing operation to a specific value according to the time template, where the specific value may be all 0 s or all 1 s, and may also be a specific sequence for identifying the symbol closing.
Additionally, the rf channel closing information detecting unit 506 is configured to detect downlink symbol data, and if the baseband data is detected to be a continuous specific value, the starting time point of the symbol is a starting time point for performing closing; the unit issues an instruction to turn off/on the rf channel, which may be in the form of a switch level or other instruction. In the case where the baseband processing unit 504 does not perform the data setting operation, it is necessary to perform the determination after considering the position information excluding the common pilot at the time of the determination.
The rf channel closing execution unit 507 executes an operation of closing/opening the rf channel according to an instruction of closing/opening the rf channel output by the rf channel closing detection unit 506.
The rf channel shutdown execution unit 507 may execute a complete shutdown operation of the rf channel once or may execute a step-by-step shutdown operation of the rf channel according to different requirements of the rf channel design, that is, a small signal part shutdown (analog devices such as a digital-to-analog converter and an analog transceiver) and a large signal part shutdown (power amplifier) of the rf channel.
In practical application, since a signal stabilization process is required when the rf device is switched from the off state to the operating state, when the next symbol is an on symbol, the end time of the last symbol off period needs to be advanced properly, and generally needs to be advanced by 1-5 us according to the difference of the device stabilization time.
For the distributed structure base station, a specific embodiment device is proposed, as shown in fig. 6. On the BBU side, the method comprises the following steps: statistic section 601, determination section 602, detection section 603, base station scheduler 604, base station data transmission section 605, and radio channel closure information detection notification section 606. On the RRU side, the method comprises the following steps: a baseband data receiving unit 611, an rf channel shutdown information detecting unit 612, and an rf channel shutdown executing unit 613.
The statistical unit 601 is configured to collect and count service load information, and report statistical result information according to a set period. The reporting period can be set as required, and the set period is an integral multiple of 10 ms.
A determining unit 602, configured to determine whether the downlink subframe traffic load value is smaller than a downlink subframe traffic load threshold value according to the statistics result information reported by the statistics unit 601; and notifies the detection unit 603 of the determination result. If it is not
A detecting unit 603, configured to detect a configuration of symbols in a downlink subframe when a downlink subframe traffic load value is smaller than a downlink subframe traffic load threshold value; and further determines a symbol closing time template and informs the base station scheduler 604 according to the configuration of the symbols in the downlink subframe.
The base station scheduler 604 schedules the data to be carried according to the symbol closing time template, and notifies the baseband data processing unit 605 of the data. For symbols not carrying downlink data, scheduling is not needed.
A baseband data processing unit 605, which sets the symbol data for performing the symbol closing operation to a specific value according to the time template, where the specific value may be all 0 or all 1, and may also be a specific sequence for identifying the subframe closing; and sending the baseband data to the RRU.
The radio frequency channel closing information detection notifying unit 606 is configured to detect downlink symbol data, and if the baseband data is a continuous specific value or a sequence used to identify symbol closing, the starting time point of the symbol is a starting time point for executing closing, and the unit sends an instruction for closing/opening the radio frequency channel and notifies the RRU of the closing/opening time point information, where the specific notification mode may be implemented in a signaling mode.
On the RRU side, a baseband data receiving unit 611 is configured to receive baseband data from the BBU.
The rf channel closing information detection unit 612 receives the symbol closing time template information from the BBU side, and sends a corresponding control instruction to the rf channel closing execution unit 613.
The rf channel closing execution unit 613 executes the rf channel closing and opening operations according to the control instruction output by the rf channel closing information detection unit 612.
The control radio frequency channel closing execution unit can execute one-time complete closing operation of the radio frequency channel according to different requirements of radio frequency channel design, and can also execute operation of closing the radio frequency channel step by step, namely, small signal part closing (analog devices such as a digital-to-analog converter and an analog transceiver) and large signal part closing (a power amplifier) of the sub radio frequency channel.
For the distributed base station, the present invention further provides another specific implementation apparatus, as shown in fig. 7:
on the BBU side, the method comprises the following steps: a statistic unit 701, a judgment unit 702, a detection unit 703, a base station scheduler 704, and a baseband data processing unit 705; on the RRU side, the method comprises the following steps: a baseband data receiving unit 711, a radio frequency channel closing information detecting unit 712, and a radio frequency channel closing performing unit 713.
The statistical unit 701 is configured to collect and count service load information, and report statistical result information according to a set period. The reporting period can be set as required, and the set period is an integral multiple of 10 ms.
A judging unit 702, configured to judge whether the downlink subframe traffic load value is smaller than the downlink subframe traffic load threshold value according to the statistics result information reported by the statistics unit 701; and notifies the detection unit 703 of the determination result. If it is not
A detecting unit 703, configured to detect the configuration of symbols in the downlink subframe when the downlink subframe traffic load value is smaller than the downlink subframe traffic load threshold value; and further determines a symbol closing time template and informs the base station scheduler 704 according to the configuration of the symbols in the downlink subframe.
The base station scheduler 704 schedules the data carried according to the symbol-off time template, and notifies the baseband data processing unit 705. For symbols not carrying downlink data, scheduling is not needed.
The baseband data processing unit 705, according to the time template, sets the symbol data for performing the symbol closing operation to a specific value, where the specific value may be all 0 or all 1, and may also be a specific sequence for identifying the subframe closing; and sending the baseband data to the RRU.
On the RRU side, a baseband data receiving unit 711 is configured to receive baseband data from the BBU.
The rf channel closing detection unit 712 is configured to detect symbol closing time template information, and if the baseband data is a continuous specific value or a sequence for identifying symbol closing, the starting time point of the symbol is the starting time point for executing closing, and the unit issues an instruction for closing/opening the rf channel, where the instruction may be in the form of a switch level or other instruction. When the base station sends the symbol closing time template to the RRU in a signaling manner, the radio frequency channel closing detection unit 712 detects an instruction in the signaling, and determines a starting time point for executing closing according to the corresponding instruction. In this case, the symbol closing time template information needs to be transmitted to the RRU unit through the Ir interface. In the case where the baseband processing unit 704 does not perform the data setting operation, it is necessary to perform the determination after considering the position information excluding the common pilot at the time of the determination.
The rf channel closing execution unit 713 executes an rf channel closing/opening operation according to the corresponding rf channel closing/opening instruction sent by the rf channel closing detection unit 712. According to different requirements of radio frequency channel design, one-time complete closing operation of the radio frequency channel can be executed, and the operation of closing the radio frequency channel step by step can also be executed, namely, the small signal part of the sub-radio frequency channel is turned off (analog devices such as a digital-to-analog converter and an analog transceiver) and the large signal part is turned off (a power amplifier).
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (22)
1. The energy-saving method for the base station of the mobile communication system is characterized by comprising the following steps:
determining a downlink subframe service load value;
when the downlink subframe service load value is smaller than a downlink subframe service load threshold value, detecting the configuration of symbols in a downlink subframe;
determining a symbol closing time template according to the configuration of the symbols in the downlink subframe;
closing the corresponding radio frequency channel according to the symbol closing time template;
wherein, the step of further determining the symbol closing time template specifically comprises:
closing idle symbols except special symbols in a downlink subframe, wherein the special symbols are symbols for bearing a physical control format indicator channel PCFICH, a physical HARQ indicator channel PHICH, a physical downlink control channel PDCCH, a common reference signal, a primary synchronization signal PSS, a secondary synchronization signal SSS or a physical broadcast channel PBCH;
before closing the corresponding radio frequency channel according to the symbol closing time template, the method further comprises the following steps:
if the radio frequency channel corresponding to the symbol carrying the downlink data needs to be closed, the data carried by the symbol needs to be scheduled to other available subframes.
2. The method of claim 1, wherein the downlink subframe traffic load value is a data amount carried by the downlink subframe or an average data amount carried by the downlink subframe within a set statistical period.
3. Method according to claim 1 or 2, characterized in that said method comprises
A downlink subframe service load threshold = an average data volume x Y carried by one downlink subframe;
wherein Y is the set load factor.
4. The method according to claim 3, wherein for a normal subframe, the step of detecting the configuration of symbols in the downlink subframe and further determining the symbol off time template specifically comprises:
for the 2 nth time slot of the conventional subframe, starting detection from the 1 st OFDM symbol, and determining the configuration information of a symbol closing time template;
for the 2n +1 time slot of the regular subframe, the detection is started from the 0 th OFDM symbol, and the configuration information of the symbol closing time template is determined.
5. The method of claim 4, wherein, in the case of normal CP,
A. if the detected Lth OFDM symbol value is not equal to the specific value for closing the identification symbol, detecting the next OFDM symbol existing in the time slot;
B. if the detected Lth OFDM symbol value is a specific value for marking symbol closing, then:
if L <4, turning off the Lth OFDM symbol to the 3 rd OFDM symbol, and turning off the 5 th OFDM symbol and the 6 th OFDM symbol;
if L >4, turn off the Lth OFDM symbol to the 6 th OFDM symbol.
6. The method according to claim 4, characterized in that in the extended CP case,
A. if the detected Lth OFDM symbol value is not equal to the specific value for closing the identification symbol, detecting the next OFDM symbol existing in the time slot;
B. if the detected Lth OFDM symbol value is a specific value for marking symbol closing, then:
if L <3, turning off the Lth OFDM symbol to the 2 nd OFDM symbol, and turning off the 4 th OFDM symbol and the 5 th OFDM symbol;
if L >3, turn off the Lth OFDM symbol to the 5 th OFDM symbol.
7. The method according to claim 3, wherein for subframe 0 or subframe 5 of an FDD system, in case of using normal CP, the step of detecting the configuration of symbols in the downlink subframe specifically comprises:
the detection starts from the L =1 OFDM symbol for the 2 nth slot,
A. if the detected Lth OFDM symbol value is not equal to the specific value for closing the identification symbol, detecting the next OFDM symbol existing in the time slot;
B. if the detected Lth OFDM symbol value is a specific value for marking symbol closing, then:
if L <4, closing the L-th OFDM symbol to the 3 rd OFDM symbol; otherwise, ending the time slot judgment;
the detection starts from the L =5 OFDM symbol for the 2n +1 th slot,
a', if the detected L-th OFDM symbol value is not equal to the specific value for marking symbol closing, the next OFDM symbol existing in the time slot is detected;
b', if the detected L-th OFDM symbol value is a specific value for marking symbol closing, then:
closing the L-th OFDM symbol to the last OFDM symbol of the time slot; otherwise, ending the time slot judgment.
8. The method according to claim 3, wherein for subframe 0 or subframe 5 of an FDD system, in case of using the extended CP, the step of configuring the symbols in the downlink subframe to be detected specifically comprises:
the detection starts from the L =1 OFDM symbol for the 2 nth slot,
A. if the detected Lth OFDM symbol value is not equal to the specific value for closing the identification symbol, detecting the next OFDM symbol existing in the time slot;
B. if the detected Lth OFDM symbol value is a specific value for marking symbol closing, then:
if L <3, closing the L-th OFDM symbol to the 2 nd OFDM symbol; otherwise, ending the time slot judgment;
the detection starts from the L =4 OFDM symbol for the 2n +1 th slot,
A. if the detected Lth OFDM symbol value is not equal to the specific value for closing the identification symbol, detecting the next OFDM symbol existing in the time slot;
B. if the detected Lth OFDM symbol value is a specific value for marking symbol closing, then:
if L <6, closing the L-th OFDM symbol to the last OFDM symbol of the time slot; otherwise, ending the time slot judgment.
9. The method according to claim 3, wherein for subframe 0 or subframe 5 of the TDD system, the step of detecting the configuration of the symbols in the downlink subframe specifically comprises:
for the 2n time slot, starting to detect from the 1 st OFDM symbol, and determining the configuration information of the time template of symbol closing;
for the 2n +1 th slot, in the normal CP case, detection starts from the L =5 OFDM symbols; in the case of the extended CP, starting from the L =4 OFDM symbol, determining the configuration information of the time template of which the symbol is off; wherein the last OFDM symbol of the 2n +1 th slot cannot be turned off.
10. The method according to any one of claims 5-8, wherein: the specific value of the off of the identification symbol is 0 or 1.
11. The method of claim 1, wherein before said determining that the symbol closes the time template, further comprising the steps of: and scheduling the data carried by the symbols to other available subframes.
12. The method according to claim 1, wherein the closing of the corresponding radio frequency channel according to the symbol closing time template is by closing a radio frequency small signal portion and/or a radio frequency large signal portion;
the radio frequency small signal portion comprises: a digital-to-analog converter, an analog transceiver;
the radio frequency large signal part comprises: a power amplifier.
13. A base station apparatus comprising a base station scheduler and a baseband data processing unit, characterized by further comprising: the device comprises a counting unit, a judging unit, a detecting unit and a radio frequency channel closing executing unit; wherein,
a statistic unit, configured to collect and count downlink subframe service load value information, and report statistic result information according to a set period; the set period is an integral multiple of 10 ms;
a judging unit, configured to judge whether the downlink subframe service load value is smaller than a downlink subframe service load threshold value according to the statistical result information reported by the statistical unit;
the detection unit is used for detecting the configuration of symbols in the downlink subframe and determining a symbol closing time template;
a radio frequency channel closing execution unit, configured to execute an operation of closing the radio frequency channel according to the symbol closing time template;
wherein, the step of further determining the symbol closing time template specifically comprises:
closing idle symbols except special symbols in a downlink subframe, wherein the special symbols are symbols for bearing a physical control format indicator channel PCFICH, a physical HARQ indicator channel PHICH, a physical downlink control channel PDCCH, a common reference signal, a primary synchronization signal PSS, a secondary synchronization signal SSS or a physical broadcast channel PBCH;
and the base station scheduler is used for scheduling the data carried by the symbol to other available subframes if the radio frequency channel corresponding to the symbol carrying the downlink data needs to be closed is determined before the radio frequency channel closing execution unit closes the corresponding radio frequency channel according to the symbol closing time template.
14. The apparatus of claim 13, wherein the baseband data processing unit sets baseband data of a symbol performing a shutdown operation to a specific value; the particular value is 0 or 1.
15. The apparatus according to claim 13, further comprising a radio frequency channel closing information detecting unit, configured to detect symbol closing time template information, and issue a radio frequency channel closing control command according to the detected symbol closing time template information.
16. The apparatus of claim 15, wherein the rf channel closing information detecting unit determines the symbol closing time template in a manner of: and detecting downlink symbol data, and if the baseband data is a continuous specific value or a sequence for identifying symbol closing, the starting time point of the symbol is the starting time point for executing closing.
17. The apparatus according to claim 15, wherein the rf channel shutdown execution unit executes the rf channel shutdown operation in the symbol shutdown period according to the rf channel shutdown control command output by the rf channel shutdown detection unit.
18. The apparatus of claim 17, wherein the ending time of the RF channel closing operation is advanced by 1-5 us relative to the symbol ending time.
19. The apparatus according to claim 13, wherein the operation of closing the radio frequency channel is performed, in particular, the radio frequency small signal portion and/or the radio frequency large signal portion is turned off;
the radio frequency small signal part comprises: an analog-to-digital converter, an analog transceiver;
the radio frequency large signal part comprises: a power amplifier.
20. The apparatus of claim 13,
the statistical unit, the judgment unit, the detection unit, the base station scheduler and the baseband data processing unit are arranged in the baseband unit BBU;
the radio frequency channel closing information detection unit and the radio frequency channel closing execution unit are arranged in a radio remote unit RRU;
the radio remote unit RRU further comprises a baseband data receiving unit for receiving baseband data from the baseband unit BBU.
21. The apparatus of claim 20,
the base band unit BBU further comprises a radio frequency channel closing information detection and notification unit for detecting the symbol closing time template information and notifying the symbol closing time template information to the RRU.
22. The apparatus of claim 21, wherein the manner for notifying the RRU of the symbol off time template information is a signaling manner.
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| CN104641703A (en) * | 2013-04-19 | 2015-05-20 | 华为技术有限公司 | Paging method, apparatus and system |
| CN103648151B (en) * | 2013-11-14 | 2017-02-01 | 上海华为技术有限公司 | Power-supplying control system, control method and base-band processing unit |
| CN104717047B (en) * | 2013-12-16 | 2018-09-25 | 中国移动通信集团公司 | Symbol cut-off method and device |
| CN104507147B (en) * | 2014-12-02 | 2018-05-29 | 上海华为技术有限公司 | A kind of power amplifier control device and method |
| CN104837188B (en) * | 2015-04-23 | 2018-07-10 | 河北远东通信系统工程有限公司 | A kind of power-saving method of Digital Clustering channel device |
| CN105682208A (en) * | 2016-03-17 | 2016-06-15 | 京信通信技术(广州)有限公司 | Small cell energy saving method and local controller |
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| CN112189362B (en) * | 2018-06-20 | 2022-04-22 | 华为技术有限公司 | Symbol processing method and related equipment |
| WO2020042172A1 (en) * | 2018-08-31 | 2020-03-05 | 华为技术有限公司 | Control method and related device |
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| CN114449626B (en) * | 2020-11-02 | 2023-05-16 | 中国联合网络通信集团有限公司 | Energy-saving control method and device |
| CN112543496B (en) * | 2020-12-02 | 2023-03-21 | 深圳国人无线通信有限公司 | Distributed base station and energy-saving method thereof |
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| CN113727294B (en) * | 2021-08-12 | 2023-03-24 | 中国联合网络通信集团有限公司 | Communication method and device |
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